Decadal Scale Variability In The Meridional Circulation Of Upper Circumpolar Deep Water And Its Impact On Primary Production In The Southern Ocean

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Decadal-scale Variability in the Meridional Circulation of Upper Circumpolar Deep Water and Its Impact on Primary Production in the Southern Ocean

Author : Barbara Mary Johnston
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (86 download)

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Book Synopsis Decadal-scale Variability in the Meridional Circulation of Upper Circumpolar Deep Water and Its Impact on Primary Production in the Southern Ocean by : Barbara Mary Johnston

Download or read book Decadal-scale Variability in the Meridional Circulation of Upper Circumpolar Deep Water and Its Impact on Primary Production in the Southern Ocean written by Barbara Mary Johnston and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : The Southern Ocean is vitally important in understanding climate change, both regionally and globally. This is due partly to physical factors such as the Antarctic Circumpolar Current (ACC), which facilitates the interchange of heat, nutrients and carbon dioxide between the world oceans. These physical factors also include the seasonal variation in sea-ice around the Antarctic continent and the strong Southern Hemisphere westerly winds, which are responsible for the divergence-driven upwelling of deep water to the surface, south of the Polar Front. The Upper branch of the Circumpolar Deep Water (UCDW) is warm, relative to Antarctic waters, and is high in dissolved inorganic carbon and nutrients, in particular iron. It contributes to carbon dioxide regulation, therefore, through temperature effects on solubility, the out-gassing of carbon dioxide and also via its effect on primary production and the biological pump. This project examines long-term trends in the meridional circulation of UCDW and in upper-ocean structure, primarily in the Australian region (110- 160E, 40-70S) of the Southern Ocean. This is achieved by the use of the Simple Ocean Data Assimilation (SODA) 2.0.2/2.0.4 reanalysis of ocean climate variability, which combines output from an ocean global circulation model with observational data, through a sequential data estimation scheme. Trends are produced for 1958-2007, in five-degree latitudinal bands that approximate the ACC frontal zones, for UCDW and mixed layer hydrodynamic variables and these are related to trends in Southern Hemisphere winds and global climate indices. In addition, similar trends are also produced for the shorter period 1997-2007, for which satellite data are available, and these trends are related to trends in chlorophyll-a, a proxy for phytoplankton biomass, and primary production. As well as these trends, interannual variability in chlorophyll-a in spring and summer, and its controls, are also studied.

Ocean Circulation and Climate

Author : John L. Bullister
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128058595
Total Pages : 72 pages
Book Rating : 4.1/5 (28 download)

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Book Synopsis Ocean Circulation and Climate by : John L. Bullister

Download or read book Ocean Circulation and Climate written by John L. Bullister and published by Elsevier Inc. Chapters. This book was released on 2013-10-22 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Formation of the deepest waters of the World Ocean occurs in limited regions of the global ocean, primarily in the northern North Atlantic where North Atlantic Deep Water (NADW) is formed, and at a number of sites around the continental margins of Antarctica where Antarctic Bottom Waters (AABW) are formed. The deepwater formation processes play a significant role in determining the large-scale physical and biogeochemical properties of the deep ocean. These limited regions provide a conduit from the surface into the vast volumes of water in the deep ocean. We report in this chapter on observed physical and biochemical changes in the deep ocean and discuss these in the context of deepwater formation. Intensive observation programs in the North Atlantic during the past decades have demonstrated that there have been significant changes in the volumes and properties of Upper and Lower NADW as well as AABW. Studies have found systematic warming of AABW during the past two decades along a number of its major flow pathways, as well as evidence for a reduction in overall volume of AABW in the global deep ocean. Lower NADW, on the other hand, has been undergoing systematic cooling for the past four decades, whereas Upper NADW (primarily Labrador Sea Water) has been exposed to large decadal variability, both in properties and formation rates. In total, the deepwaters of the World Ocean (beneath ca. 2000–3000m) have warmed during the past two decades. Changes in the deep ocean can have enormous influence on Earth’s climate. Warming of the deep ocean makes a significant contribution to global sea level rise. The capacity of the deep ocean to take up and store anthropogenic CO2 has and will have a major impact on the CO2 content of the atmosphere now and far into the future. Paleooceanographic studies have provided evidence that despite the century-long timescales associated with renewal of deepwater, rapid, major changes in deepwater formation and deep ocean circulation have occurred in the past, resulting in rapid changes in Earth’s climate. Continued monitoring and analysis are necessary to follow and understand the changes in the deep ocean—this is a very important component of Earth’s climate.

Ocean Circulation

Author : Andreas Schmittner
Publisher : American Geophysical Union
ISBN 13 :
Total Pages : 828 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Ocean Circulation by : Andreas Schmittner

Download or read book Ocean Circulation written by Andreas Schmittner and published by American Geophysical Union. This book was released on 2007-01-09 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: The meridional overturning circulation is a system of surface and deep currents encompassing all ocean basins. It transports large amounts of water, heat, salt, carbon, nutrients and other substances around the globe, and connects the surface ocean and atmosphere with the huge reservoir of the deep sea. As such, it is of critical importance to the global climate system. This monograph summarizes the current state of knowledge of this current system, how it has changed in the past and how it may change in the future, its driving mechanisms, and the impacts of its variability on climate, ecosystems and biogeochemical cycles.

Ocean Circulation and Climate

Author : Mojib Latif
Publisher : Elsevier Inc. Chapters
ISBN 13 : 0128058749
Total Pages : 60 pages
Book Rating : 4.1/5 (28 download)

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Book Synopsis Ocean Circulation and Climate by : Mojib Latif

Download or read book Ocean Circulation and Climate written by Mojib Latif and published by Elsevier Inc. Chapters. This book was released on 2013-10-22 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: An inherent feature of the climate is its strong variability on a vast range of timescales, from seasonal to multimillennial and beyond. Decadal variability, which is the topic of this chapter, has large implications for society, as its consequences can be experienced by individuals during their own lifetime. Examples of decadal variability include the Dust Bowl drought of the 1930s in the American and Canadian prairie lands, the Sahel drought of the 1970s and 1980s, the ongoing drought which started in 2000 in the southwestern United States, and the multidecadal variability in Atlantic hurricane activity during the twentieth century. Furthermore, it is the decadal to multidecadal variability that makes the detection of anthropogenic climate change a challenge, since global warming evolves on a similar timescale. The detection problem specifically applies to the regional scale, where natural variability is the strongest. It is a central challenge of climate science to understand and possibly predict such regional-scale climate variability and change over timescales of decades.

Antarctic Sea Ice Variability in the Southern Ocean-Climate System

Author : National Academies of Sciences, Engineering, and Medicine
Publisher : National Academies Press
ISBN 13 : 0309456002
Total Pages : 83 pages
Book Rating : 4.3/5 (94 download)

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Book Synopsis Antarctic Sea Ice Variability in the Southern Ocean-Climate System by : National Academies of Sciences, Engineering, and Medicine

Download or read book Antarctic Sea Ice Variability in the Southern Ocean-Climate System written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2017-04-24 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sea ice surrounding Antarctica has increased in extent and concentration from the late 1970s, when satellite-based measurements began, until 2015. Although this increasing trend is modest, it is surprising given the overall warming of the global climate and the region. Indeed, climate models, which incorporate our best understanding of the processes affecting the region, generally simulate a decrease in sea ice. Moreover, sea ice in the Arctic has exhibited pronounced declines over the same period, consistent with global climate model simulations. For these reasons, the behavior of Antarctic sea ice has presented a conundrum for global climate change science. The National Academies of Sciences, Engineering, and Medicine held a workshop in January 2016, to bring together scientists with different sets of expertise and perspectives to further explore potential mechanisms driving the evolution of recent Antarctic sea ice variability and to discuss ways to advance understanding of Antarctic sea ice and its relationship to the broader ocean-climate system. This publication summarizes the presentations and discussions from the workshop.

Natural Climate Variability on Decade-to-Century Time Scales

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309054494
Total Pages : 645 pages
Book Rating : 4.3/5 (9 download)

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Book Synopsis Natural Climate Variability on Decade-to-Century Time Scales by : National Research Council

Download or read book Natural Climate Variability on Decade-to-Century Time Scales written by National Research Council and published by National Academies Press. This book was released on 1996-08-30 with total page 645 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume reflects the current state of scientific knowledge about natural climate variability on decade-to-century time scales. It covers a wide range of relevant subjects, including the characteristics of the atmosphere and ocean environments as well as the methods used to describe and analyze them, such as proxy data and numerical models. They clearly demonstrate the range, persistence, and magnitude of climate variability as represented by many different indicators. Not only do natural climate variations have important socioeconomic effects, but they must be better understood before possible anthropogenic effects (from greenhouse gas emissions, for instance) can be evaluated. A topical essay introduces each of the disciplines represented, providing the nonscientist with a perspective on the field and linking the papers to the larger issues in climate research. In its conclusions section, the book evaluates progress in the different areas and makes recommendations for the direction and conduct of future climate research. This book, while consisting of technical papers, is also accessible to the interested layperson.

Interacting Climates of Ocean Basins

Author : Carlos R. Mechoso
Publisher : Cambridge University Press
ISBN 13 : 1108492703
Total Pages : 359 pages
Book Rating : 4.1/5 (84 download)

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Book Synopsis Interacting Climates of Ocean Basins by : Carlos R. Mechoso

Download or read book Interacting Climates of Ocean Basins written by Carlos R. Mechoso and published by Cambridge University Press. This book was released on 2020-11-26 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review of interactions between the climates of different ocean basins and their key contributions to global climate variability and change. Providing essential theory and discussing outstanding examples as well as impacts on monsoons, it a useful resource for graduate students and researchers in the atmospheric and ocean sciences.

Variability of Large-scale Ocean Circulation and Meridional Heat Transport in the Atlantic Ocean

Author : Jinting Zhang
Publisher :
ISBN 13 :
Total Pages : 119 pages
Book Rating : 4.:/5 (936 download)

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Book Synopsis Variability of Large-scale Ocean Circulation and Meridional Heat Transport in the Atlantic Ocean by : Jinting Zhang

Download or read book Variability of Large-scale Ocean Circulation and Meridional Heat Transport in the Atlantic Ocean written by Jinting Zhang and published by . This book was released on 2015 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research described in the dissertation addresses what controls the variability of ocean circulation and meridional heat transport (MHT) in the Atlantic Ocean on different timescales. Chapter 2 focuses on the contribution of surface heating and wind forcing with/without topography to the seasonal and interannual-to-decadal variations of large-scale sea surface height (SSH) using simplified models. On the seasonal timescale thermosteric height explains most of the SSH variance north of 18°N and first mode linear long Rossby wave explains the SSH between 10°N-15°N and east of Greenland. On interannual-to-decadal timescales, a topographic Sverdrup response explains interannual-to-decadal SSH between 53°N and 63°N east of Greenland, suggesting the important role of topography in the subpolar region. Farther south, the linear Rossby wave model explains SSH variations on interannual-to-decadal timescales between 30°N and 50°N from mid-basin to the eastern boundary. In Chapter 3, perturbation experiments and a 1000-year control simulation in the GFDL coupled model CM2.1 are used to investigate the evolution of the Atlantic meridional overturning circulation (AMOC) and its related upper ocean heat content (UOHC) on the decadal timescale. A slow southward propagation of positive AMOC anomaly in northern high latitudes leads to a convergence (divergence) of the Atlantic MHT anomaly in the subpolar (Gulf Stream) region, thus warming (cooling) in the subpolar (Gulf Stream) region after several years. The study presented in Chapter 4 examines the coherence structure of the interannual MHT variability in the Atlantic tropics and subtropics using seven simulations in the CMIP5 (Coupled Model Intercomparison Project Phase 5) archive as well as a hindcast simulation in the isopycnal ocean model GOLD (Generalized Ocean Layered Dynamics) from 1971 to 2009. The spatial pattern for the leading mode of the interannual MHT anomaly from all the model simulations has the same sign from 20°S-30°N, with a peak near the equator. Ekman heat transport anomalies between 7°S-20°N and the geostrophic transport beneath the Ekman layer from 13°S-27°N (except the equator) contribute to this MHT leading mode, while the contribution of the deep ocean is negligible. The connection between the hemispheres results from diapycnal transport of the northward geostrophic transport beneath the Ekman layer in the southern tropics; after this water reaches the upper ocean, it then moves northward where Ekman transport takes over. The wind is the main external forcing for the MHT coherence structure. The work in this thesis enhances the understanding of the contributions of heating, winds and topography on sea level changes on seasonal and interannual-to-decadal timescales, as well as the decadal and interannual variability of the AMOC and MHT in the Atlantic Ocean. It could be used to understand the effect of topography on the ocean circulation in the high latitude, improve the decadal prediction of the UOHC in the North Atlantic Ocean, and advance the knowledge of the tropical Atlantic heat transport and ocean-atmosphere coupling system.

Climate Change 2014 – Impacts, Adaptation and Vulnerability: Part B: Regional Aspects: Volume 2, Regional Aspects

Author : Intergovernmental Panel on Climate Change (IPCC)
Publisher : Cambridge University Press
ISBN 13 : 1316240355
Total Pages : 696 pages
Book Rating : 4.3/5 (162 download)

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Book Synopsis Climate Change 2014 – Impacts, Adaptation and Vulnerability: Part B: Regional Aspects: Volume 2, Regional Aspects by : Intergovernmental Panel on Climate Change (IPCC)

Download or read book Climate Change 2014 – Impacts, Adaptation and Vulnerability: Part B: Regional Aspects: Volume 2, Regional Aspects written by Intergovernmental Panel on Climate Change (IPCC) and published by Cambridge University Press. This book was released on 2014-12-29 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: This latest Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) will again form the standard reference for all those concerned with climate change and its consequences, including students, researchers and policy makers in environmental science, meteorology, climatology, biology, ecology, atmospheric chemistry and environmental policy.

Ocean Mixing

Author : Michael Meredith
Publisher : Elsevier
ISBN 13 : 0128215135
Total Pages : 386 pages
Book Rating : 4.1/5 (282 download)

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Book Synopsis Ocean Mixing by : Michael Meredith

Download or read book Ocean Mixing written by Michael Meredith and published by Elsevier. This book was released on 2021-09-16 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocean Mixing: Drivers, Mechanisms and Impacts presents a broad panorama of one of the most rapidly-developing areas of marine science. It highlights the state-of-the-art concerning knowledge of the causes of ocean mixing, and a perspective on the implications for ocean circulation, climate, biogeochemistry and the marine ecosystem. This edited volume places a particular emphasis on elucidating the key future questions relating to ocean mixing, and emerging ideas and activities to address them, including innovative technology developments and advances in methodology. Ocean Mixing is a key reference for those entering the field, and for those seeking a comprehensive overview of how the key current issues are being addressed and what the priorities for future research are. Each chapter is written by established leaders in ocean mixing research; the volume is thus suitable for those seeking specific detailed information on sub-topics, as well as those seeking a broad synopsis of current understanding. It provides useful ammunition for those pursuing funding for specific future research campaigns, by being an authoritative source concerning key scientific goals in the short, medium and long term. Additionally, the chapters contain bespoke and informative graphics that can be used in teaching and science communication to convey the complex concepts and phenomena in easily accessible ways. - Presents a coherent overview of the state-of-the-art research concerning ocean mixing - Provides an in-depth discussion of how ocean mixing impacts all scales of the planetary system - Includes elucidation of the grand challenges in ocean mixing, and how they might be addressed

The Ocean and Cryosphere in a Changing Climate

Author : Intergovernmental Panel on Climate Change (IPCC)
Publisher : Cambridge University Press
ISBN 13 : 9781009157971
Total Pages : 755 pages
Book Rating : 4.1/5 (579 download)

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Book Synopsis The Ocean and Cryosphere in a Changing Climate by : Intergovernmental Panel on Climate Change (IPCC)

Download or read book The Ocean and Cryosphere in a Changing Climate written by Intergovernmental Panel on Climate Change (IPCC) and published by Cambridge University Press. This book was released on 2022-04-30 with total page 755 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Intergovernmental Panel on Climate Change (IPCC) is the leading international body for assessing the science related to climate change. It provides policymakers with regular assessments of the scientific basis of human-induced climate change, its impacts and future risks, and options for adaptation and mitigation. This IPCC Special Report on the Ocean and Cryosphere in a Changing Climate is the most comprehensive and up-to-date assessment of the observed and projected changes to the ocean and cryosphere and their associated impacts and risks, with a focus on resilience, risk management response options, and adaptation measures, considering both their potential and limitations. It brings together knowledge on physical and biogeochemical changes, the interplay with ecosystem changes, and the implications for human communities. It serves policymakers, decision makers, stakeholders, and all interested parties with unbiased, up-to-date, policy-relevant information. This title is also available as Open Access on Cambridge Core.

Frontiers in Decadal Climate Variability

Author : National Academies of Sciences, Engineering, and Medicine
Publisher : National Academies Press
ISBN 13 : 0309444640
Total Pages : 92 pages
Book Rating : 4.3/5 (94 download)

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Book Synopsis Frontiers in Decadal Climate Variability by : National Academies of Sciences, Engineering, and Medicine

Download or read book Frontiers in Decadal Climate Variability written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2016-07-22 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many factors contribute to variability in Earth's climate on a range of timescales, from seasons to decades. Natural climate variability arises from two different sources: (1) internal variability from interactions among components of the climate system, for example, between the ocean and the atmosphere, and (2) natural external forcings, such as variations in the amount of radiation from the Sun. External forcings on the climate system also arise from some human activities, such as the emission of greenhouse gases (GHGs) and aerosols. The climate that we experience is a combination of all of these factors. Understanding climate variability on the decadal timescale is important to decision-making. Planners and policy makers want information about decadal variability in order to make decisions in a range of sectors, including for infrastructure, water resources, agriculture, and energy. In September 2015, the National Academies of Sciences, Engineering, and Medicine convened a workshop to examine variability in Earth's climate on decadal timescales, defined as 10 to 30 years. During the workshop, ocean and climate scientists reviewed the state of the science of decadal climate variability and its relationship to rates of human-caused global warming, and they explored opportunities for improvement in modeling and observations and assessing knowledge gaps. Frontiers in Decadal Climate Variability summarizes the presentations and discussions from the workshop.

Ocean Biogeochemistry

Author : Michael J.R. Fasham
Publisher : Springer Science & Business Media
ISBN 13 : 3642558445
Total Pages : 324 pages
Book Rating : 4.6/5 (425 download)

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Book Synopsis Ocean Biogeochemistry by : Michael J.R. Fasham

Download or read book Ocean Biogeochemistry written by Michael J.R. Fasham and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oceans account for 50% of the anthropogenic CO2 released into the atmosphere. During the past 15 years an international programme, the Joint Global Ocean Flux Study (JGOFS), has been studying the ocean carbon cycle to quantify and model the biological and physical processes whereby CO2 is pumped from the ocean's surface to the depths of the ocean, where it can remain for hundreds of years. This project is one of the largest multi-disciplinary studies of the oceans ever carried out and this book synthesises the results. It covers all aspects of the topic ranging from air-sea exchange with CO2, the role of physical mixing, the uptake of CO2 by marine algae, the fluxes of carbon and nitrogen through the marine food chain to the subsequent export of carbon to the depths of the ocean. Special emphasis is laid on predicting future climatic change.

Ocean, Ice, and Atmosphere

Author : Stanley S. Jacobs
Publisher : American Geophysical Union
ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Ocean, Ice, and Atmosphere by : Stanley S. Jacobs

Download or read book Ocean, Ice, and Atmosphere written by Stanley S. Jacobs and published by American Geophysical Union. This book was released on 1998-02-04 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this latest oceanology volume of the Antarctic Research Series, polar scientists describe and model air-sea and ice-ocean interactions, the formation and chemistry of deep and bottom waters, regional circulations, tidal heights and currents, ocean bathymetry, interannual variability and the Antarctic Slope Front.

Dissertation Abstracts International

Author :
Publisher :
ISBN 13 :
Total Pages : 906 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Dissertation Abstracts International by :

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Abrupt Impacts of Climate Change

Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309287766
Total Pages : 281 pages
Book Rating : 4.3/5 (92 download)

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Book Synopsis Abrupt Impacts of Climate Change by : National Research Council

Download or read book Abrupt Impacts of Climate Change written by National Research Council and published by National Academies Press. This book was released on 2013-12-31 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate is changing, forced out of the range of the past million years by levels of carbon dioxide and other greenhouse gases not seen in the Earth's atmosphere for a very, very long time. Lacking action by the world's nations, it is clear that the planet will be warmer, sea level will rise, and patterns of rainfall will change. But the future is also partly uncertain-there is considerable uncertainty about how we will arrive at that different climate. Will the changes be gradual, allowing natural systems and societal infrastructure to adjust in a timely fashion? Or will some of the changes be more abrupt, crossing some threshold or "tipping point" to change so fast that the time between when a problem is recognized and when action is required shrinks to the point where orderly adaptation is not possible? Abrupt Impacts of Climate Change is an updated look at the issue of abrupt climate change and its potential impacts. This study differs from previous treatments of abrupt changes by focusing on abrupt climate changes and also abrupt climate impacts that have the potential to severely affect the physical climate system, natural systems, or human systems, often affecting multiple interconnected areas of concern. The primary timescale of concern is years to decades. A key characteristic of these changes is that they can come faster than expected, planned, or budgeted for, forcing more reactive, rather than proactive, modes of behavior. Abrupt Impacts of Climate Change summarizes the state of our knowledge about potential abrupt changes and abrupt climate impacts and categorizes changes that are already occurring, have a high probability of occurrence, or are unlikely to occur. Because of the substantial risks to society and nature posed by abrupt changes, this report recommends the development of an Abrupt Change Early Warning System that would allow for the prediction and possible mitigation of such changes before their societal impacts are severe. Identifying key vulnerabilities can help guide efforts to increase resiliency and avoid large damages from abrupt change in the climate system, or in abrupt impacts of gradual changes in the climate system, and facilitate more informed decisions on the proper balance between mitigation and adaptation. Although there is still much to learn about abrupt climate change and abrupt climate impacts, to willfully ignore the threat of abrupt change could lead to more costs, loss of life, suffering, and environmental degradation. Abrupt Impacts of Climate Change makes the case that the time is here to be serious about the threat of tipping points so as to better anticipate and prepare ourselves for the inevitable surprises.

Ocean-atmosphere Coupled Modes of Decadal Variability in the Southern Hemisphere

Author : Gang Wang
Publisher :
ISBN 13 :
Total Pages : 171 pages
Book Rating : 4.:/5 (11 download)

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Book Synopsis Ocean-atmosphere Coupled Modes of Decadal Variability in the Southern Hemisphere by : Gang Wang

Download or read book Ocean-atmosphere Coupled Modes of Decadal Variability in the Southern Hemisphere written by Gang Wang and published by . This book was released on 2015 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Southern Ocean has a critical influence on the global climate, and any long-term variability in the Southern Ocean can have both regional and global impacts significantly. However, sparse observations limit the study of the long-term variation. To test the quality of models simulating the natural sea surface temperature (SST) variability, the SST variability in the global oceans is evaluated in simulations of the Climate Model Intercomparison Project Phase 3 (CMIP3) and CMIP5 models. The result shows that some models demonstrate good skill in simulating the observed spatial structure of the SST variability in the tropical domains and less so in the extra-tropical domains. The CMIP5 ensemble exhibits some improvement over the CMIP3 ensemble, mostly in the tropical domains on SST variability simulation. Further, the spatial structure of the SST modes of the CMIP3 and CMIP5 super ensemble is more realistic than any single model, which is mostly used for the following study. Several SST leading modes in the Southern Ocean are discussed on decadal and even larger time scales using CMIP5 data set based on EOF analysis. We compare the modes against several simple null hypotheses, such as isotropic diffusion (red noise) and a Slab Ocean model, to investigate the sources of decadal variability and the factors affecting the propagation and decay of long-term anomalies. The result reveals that the annular mode with largest amplitudes in the Pacific, the basin-wide monopole mode and South Pacific dipole are the principle patterns with low-frequency variability, which contain the dual effects of internal intrinsic processes as well as external forcing and teleconnections. The annular mode is mostly affected by El Niño Southern Oscillation (ENSO) via teleconnection especially in the South Pacific domain and by local Southern Annular Mode (SAM) over the whole Southern Ocean. The monopole mode and South Pacific dipole mode, while they both demonstrate pronounced multi-decadal and longer time scales variability, are firstly inducted by the Wave-3 patterns in the atmosphere and further developed via ocean dynamics. The causes and characteristics of interannual-decadal SST variability in the Southern Ocean are further investigated with an ocean general circulation model and a simplified band ocean model. Possible factors are examined affecting the generation, propagation and decay of long-term anomalies with a series of sensitivity experiments. We found that the atmospheric forcing not only affects the SST modes on shorter time-scales directly, but also shows its influence on longer time scales via air-sea interaction, amplification and oceanic feedback. The deep mixed layer in the Southern Ocean is an essential element to maintain the long-term SST variability. The ocean dynamics connect the entire ocean and create the homogeneous-like spatial patterns. The ocean advection is the key factor to create SST spectral structure, which concentrates the spectrum on interannnual scale synchronizing with the transport of Antarctic Circumpolar Current (ACC).