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Extent Timing And Climatic Significance Of Latest Pleistocene And Holocene Glaciation In The Sierra Nevada California
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Book Synopsis Extent, Timing, and Climatic Significance of Latest Pleistocene and Holocene Glaciation in the Sierra Nevada, California by : Douglas Howe Clark
Download or read book Extent, Timing, and Climatic Significance of Latest Pleistocene and Holocene Glaciation in the Sierra Nevada, California written by Douglas Howe Clark and published by . This book was released on 1995 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Extent, Timing, and Climatic Significance of Latest Pleistocene and Holocene Glaciation in the Sierra Nevada, California by :
Download or read book Extent, Timing, and Climatic Significance of Latest Pleistocene and Holocene Glaciation in the Sierra Nevada, California written by and published by . This book was released on 1995 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite more than a century of study, scant attention has been paid to the glacial record in the northern end of the Sierra Nevada, and to the smaller moraines deposited after the retreat of the Tioga (last glacial maximum) glaciers. Equilibrium-line altitude (ELA) estimates of the ice fields indicate that the Tioga ELA gradients there are consistent with similar estimates for the southern half of the range, and with an intensification of the modern temperature/precipitation pattern in the region. The Recess Peak advance has traditionally been considered to be mid-Neoglacial age, about 2--3,000 yr B.P., on the basis of relative weathering estimates. Sediment cores of lakes dammed behind moraines correlative with Recess Peak in four widely spaced sites yields a series of high-resolution AMS radiocarbon dates which demonstrate that Recess Peak glaciers retreated before (approximately) 13,100 cal yr B.P. This minimum limiting age indicates that the advance predates the North Atlantic Younger Dryas cooling. It also implies that there have been no advances larger than the Matthes in the roughly 12,000 year interval between it and the Recess Peak advance. This finding casts doubt on several recent studies that claim Younger Dryas glacier advances in western North America. The 13,100 cal yr B.P. date is also a minimum age for deglaciation of the sample sites used to calibrate the in situ production rates of cosmogenic 1°Be and 26Al. The discrepancy between this age and the 11,000 cal yr B.P. exposure age assumed in the original calibration introduces a large (> 19%) potential error in late-Pleistocene exposure ages calculated using these production rates.
Book Synopsis Quaternary Glaciations - Extent and Chronology by : J. Ehlers
Download or read book Quaternary Glaciations - Extent and Chronology written by J. Ehlers and published by Elsevier. This book was released on 2011-08-17 with total page 1128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents an up-to-date, detailed overview of the Quaternary glaciations all over the world, not only with regard to stratigraphy but also with regard to major glacial landforms and the extent of the respective ice sheets. The locations of key sites are included. The information is presented in digital, uniformly prepared maps which can be used in a Geographical Information System (GIS) such as ArcView or ArcGIS. The accompanying text supplies the information on how the data were obtained (geomorphology, geological mapping, air photograph evaluation, satellite imagery), how the features were dated (14C, TL, relative stratigraphy) and how reliable they are supposed to be. All references to the underlying basic publications are included. Where controversial interpretations are possible e.g. in Siberia or Tibet, this is pointed out. As a result, the information on Quaternary glaciations worldwide will be much improved and supplied in a uniform digital format. The information on the glacial limits is compiled in digital form by the coordinators of the project, and is available for download at: http://booksite.elsevier.com/9780444534477/ Completely updated detailed coverage of worldwide Quaternary glaciations Information in digital, uniformly prepared maps which can be used in a GIS such as ArcView or ArcGis Step-by-step guideline how to open and use ArcGis files Possibility to convert the shapefiles into GoogleEarth kmz-files Availability of chronological controls
Book Synopsis An Extension of the Known Area of Pleistocene Glaciation to the Coast Ranges of California by : Ruliff Stephen Holway
Download or read book An Extension of the Known Area of Pleistocene Glaciation to the Coast Ranges of California written by Ruliff Stephen Holway and published by . This book was released on 1911 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Glaciers of California by : Bill Guyton
Download or read book Glaciers of California written by Bill Guyton and published by Univ of California Press. This book was released on 1998-10-27 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glaciers in sunny California? Many people will be surprised to learn that there are several hundred in this state, ranging in size from the impressive Whitney Glacier on Mt. Shasta and the Palisade Glacier in the Sierra Nevada to tiny glacierets. While California's glaciers are small compared to those in the northern Rockies or the European Alps, each one is interesting and some are suitable for exploring. Also of note is the fact that Ice Age glaciers carved California's most spectacular mountain scenery—the High Sierra was glaciated several times and glacial landforms are prominent features of the Sierran landscape today. Bill Guyton summarizes the history of the discovery of Ice Age glaciation and modern-day glaciers in California, as well as the development of modern ideas about the state's glacial history. He describes the controversy about the origin of Yosemite Valley and quotes from the colorful accounts of early mountain explorers such as John Muir, Josiah Whitney, and François Matthes. His book provides a primer on glaciers and glacial landforms, a glossary of technical terms, helpful illustrations, and a 100-mile Sierra field trip guide for readers who want to see glaciers and glacial features for themselves. Glaciers of California will make any visit to the mountains more interesting, whether one is carrying a camera, crampons, or a fishing pole.
Book Synopsis Regional Trends in Holocene Glaciation of the Southeastern Sierra Nevada, California by : Michael Wright Trumbower
Download or read book Regional Trends in Holocene Glaciation of the Southeastern Sierra Nevada, California written by Michael Wright Trumbower and published by . This book was released on 2011 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Timing and Paleoclimatic Significance of Latest Pleistocene and Holocene Cirque Glaciation in the Enchantment Lakes Basin, North Cascades, WA by : Eric Leland Bilderback
Download or read book Timing and Paleoclimatic Significance of Latest Pleistocene and Holocene Cirque Glaciation in the Enchantment Lakes Basin, North Cascades, WA written by Eric Leland Bilderback and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Enchantment Lakes Basin in the Alpine Lakes Wilderness, Washington, preserves two sets of moraines that record distinct post-Wisconsin maximum advances of cirque glaciers in the eastern North Cascades. Cores collected from five lakes adjacent to the moraines indicate that there were two Neoglacial advances, culminating with the Little Ice Age, and one slightly larger advance that ended coincident with the termination of the North Atlantic Younger Dryas event. The cores show no evidence for an early Holocene advance, in contrast to some other studies in the North Cascades, (e.g., Heine, 1998; Thomas, 1997; Thomas et al., 2000). Upstream glacier activity, as indicated by rock-flour production, is recorded in the lake sediments as fluctuations in magnetic susceptibility, organic content, and sediment particle size. Tephra identification, AMS 14C dating, and paleomagnetic secular variation of the sediments provide detailed age constraints for the lake cores. The presence of the 475 cal yr B.P. Mount St. Helens Wn tephra within outwash associated with the inner (Brynhild) moraines indicates that they are Little Ice Age (LIA) equivalent. The age constraints on the lake sediments show that this advance began between ~ 1000-800 cal yr B.P. and culminated after the Wn tephra was deposited. The age of the outer (Brisingamen) moraines, previously reported as early Holocene (Waitt et al.,1982), are instead latest Pleistocene; close limiting 14C dates demonstrate that this advance ended shortly before ~11,300 cal yr B.P., suggesting temporal equivalence with the North Atlantic Younger Dryas climatic reversal (12,940 ± 260 - 11,640 ± 250 cal yr B.P; Alley et al., 1993). A ~500-yr interval of high rock-flour flux in the cores records an early Neoglacial advance between ~3300 and ~2800 cal yr B.P. that was less extensive than the subsequent LIA advance. Steady-state equilibrium-line altitudes (ELAs) for Brynhild and Brisingamen advances estimated with accumulation-area ratio and balance-ratio methods are distinct but nearly indistinguishable at ~2355 m, roughly 200 m below the modern ELA. Conditions required to form and sustain the Brisingamen and Brynhild paleoglaciers include a summer temperature depression of ~3° C, an increase of ~90 cm water-equivalent in winter precipitation, or, more likely, some lesser combination of the two. These constraints imply a local climate that could support only small-scale advances in both the latest Pleistocene and late Holocene, and warmer as well as drier conditions throughout the early Holocene.
Book Synopsis Quaternary Climatic and Glacial History of the Sierra Nevada, California by : Robert Rodney Curry
Download or read book Quaternary Climatic and Glacial History of the Sierra Nevada, California written by Robert Rodney Curry and published by . This book was released on 1968 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanisms of Global Climate Change at Millennial Time Scales by : Lloyd D. Keigwin
Download or read book Mechanisms of Global Climate Change at Millennial Time Scales written by Lloyd D. Keigwin and published by American Geophysical Union. This book was released on 1999-01-26 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contributors describe the current understanding of abrupt climate variations that have occurred at millennial to submillennial time scales, events now recognized as characteristics of the global climate during the last glaciation. Subjects covered include analysis of modern climate and ocean dynamics, paleoclimate reconstructions derived from the marine, terrestrial and ice core records, and paleoclimate modeling studies. The breadth of global paleoclimate knowledge presented here provides information required to answer many questions and provides a road map to address remaining problems. Most material is from a June 1998 conference. Lacks a subject index. Annotation copyrighted by Book News, Inc., Portland, OR.
Book Synopsis Tectonics, Climate Change and Landscape Evolution in the Southern Sierra Nevada, California by : Greg Stock
Download or read book Tectonics, Climate Change and Landscape Evolution in the Southern Sierra Nevada, California written by Greg Stock and published by . This book was released on 2003 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chronology and Paleoclimate of Late Pleistocene Glaciation in the Klamath Mountains, CA by : Nathan W. Dickey
Download or read book Chronology and Paleoclimate of Late Pleistocene Glaciation in the Klamath Mountains, CA written by Nathan W. Dickey and published by . This book was released on 2016 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glaciers are sensitive to local and global climate variations, especially to changes in precipitation and temperature over sub-millennial timescales. Therefore, glacial deposits are excellent tools for reconstructing past climates. The western United States exhibits an excellent record of glaciation, but ongoing work across the region shows complex and yetunexplained variation in timing and extent of deglaciation between different mountain ranges at the end of the Last Glacial Maximum (LGM). The Trinity Alps of the southern Klamath Mountains in Northern California contain an excellent record of Pleistocene glaciation which I use to fill a significant spatial gap in published glacial chronologies and to provide a bridge between the Sierra Nevada and the Cascades. The Trinity Alps Wilderness is a 2,130 sq. km. federally designated area located at 41.00° N, 123.00°W, approximately 60 km southwest of Mt. Shasta in Northern California. Glacial deposits in the Trinity Alps were located using Google Earth and previously published maps, and were confirmed in the field. Building on a series of previous expeditions, in the summer of 2015 twenty-four samples from five moraines were taken for 10Be exposure dating, as well as three samples from striated bedrock. Of these, six samples were selected for exposure age analysis: five from two early LGM moraines and one from an older moraine. These ages, in addition to twenty-four ages determined in a previous study, provide evidence for at least two stages of post-LGM glaciation of similar extent throughout the Trinity Alps: the first ending at 16.83 ± 1.85 ka, the second at 12.29 ± 1.23 ka. These ages correlate with the regional LGM (~17 ka) and the global Younger Dryas (~12 ka) cooling event, respectively. The moraine maps were then used to constrain results from a climate-driven 2D numerical model of glacier mass balance and flow. This model was used to determine the potential precipitation and temperature difference from modern climate that would generate the mapped glaciers. Comparison of the resulting paleoclimate curves with nearby proxies and global climate models suggest that an approximate 5.5°C decrease in temperature and 0 to 25% increase in precipitation drove LGM glaciation in the region. Additionally, these results suggest that a similarly wet but slightly warmer-than-LGM climate drove a regionally asynchronous re-advance in the Trinity Alps linked with the Younger Dryas cooling event.
Book Synopsis Holocene Climatic Nd Glacial History of the Central Sierra Nevada, California by : Robert R. Curry
Download or read book Holocene Climatic Nd Glacial History of the Central Sierra Nevada, California written by Robert R. Curry and published by . This book was released on 1970 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Late Pleistocene and Holocene Glacial History of the Pyramid Creek-South Fork American River Drainage, Sierra Nevada, California by : John Denn Whiting
Download or read book Late Pleistocene and Holocene Glacial History of the Pyramid Creek-South Fork American River Drainage, Sierra Nevada, California written by John Denn Whiting and published by . This book was released on 1985 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pleistocene Glaciation in the Mediterranean by : James Allard
Download or read book Pleistocene Glaciation in the Mediterranean written by James Allard and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis North Pacific Environment and Paleoclimate from the Late Pleistocene to Present by : Miriam Jones
Download or read book North Pacific Environment and Paleoclimate from the Late Pleistocene to Present written by Miriam Jones and published by Frontiers Media SA. This book was released on 2020-01-13 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vast area of the North Pacific, spanning ~55˚ longitude, represents a challenge for documenting and understanding the geologic history of ocean, atmosphere, and terrestrial environmental change. Nevertheless, its importance for many issues, including our fundamental understanding of ocean and atmospheric circulation patterns and teleconnections with natural modes of climate variability through time, has led to a steady rise in the numbers of study sites and proxy types. By bringing together a wide range of proxies and timescales that examine the impacts of paleoclimate on ecosystems, water, carbon, and humans, and interactions between marine and terrestrial processes, this Research Topic contributes to an improved understanding of the region’s significance at global, hemispheric, and regional scales.
Book Synopsis A Paleolimnologcal Investigation of Climatic and Hydrological Conditions During the Late Pleistocene and Holocene in the Sierra Nevada, California, USA by : Amy Melissa Bloom
Download or read book A Paleolimnologcal Investigation of Climatic and Hydrological Conditions During the Late Pleistocene and Holocene in the Sierra Nevada, California, USA written by Amy Melissa Bloom and published by . This book was released on 2006 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studies in the Pleistocene Glaciation of the Sierra Nevada, California by : John E. Kesseli
Download or read book Studies in the Pleistocene Glaciation of the Sierra Nevada, California written by John E. Kesseli and published by . This book was released on 1968 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:
