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Development Of A Modis Derived Surface Albedo Data Set An Improved Model Input For Processing The Nsrdb
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Book Synopsis Development of a MODIS-Derived Surface Albedo Data Set: An Improved Model Input for Processing the NSRDB. by :
Download or read book Development of a MODIS-Derived Surface Albedo Data Set: An Improved Model Input for Processing the NSRDB. written by and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A significant source of bias in the transposition of global horizontal irradiance to plane-of-array (POA) irradiance arises from inaccurate estimations of surface albedo. The current physics-based model used to produce the National Solar Radiation Database (NSRDB) relies on model estimations of surface albedo from a reanalysis climatalogy produced at relatively coarse spatial resolution compared to that of the NSRDB. As an input to spectral decomposition and transposition models, more accurate surface albedo data from remotely sensed imagery at finer spatial resolutions would improve accuracy in the final product. The National Renewable Energy Laboratory (NREL) developed an improved white-sky (bi-hemispherical reflectance) broadband (0.3-5.0 ..mu..m) surface albedo data set for processing the NSRDB from two existing data sets: a gap-filled albedo product and a daily snow cover product. The Moderate Resolution Imaging Spectroradiometer (MODIS) sensors onboard the Terra and Aqua satellites have provided high-quality measurements of surface albedo at 30 arc-second spatial resolution and 8-day temporal resolution since 2001. The high spatial and temporal resolutions and the temporal coverage of the MODIS sensor will allow for improved modeling of POA irradiance in the NSRDB. However, cloud and snow cover interfere with MODIS observations of ground surface albedo, and thus they require post-processing. The MODIS production team applied a gap-filling methodology to interpolate observations obscured by clouds or ephemeral snow. This approach filled pixels with ephemeral snow cover because the 8-day temporal resolution is too coarse to accurately capture the variability of snow cover and its impact on albedo estimates. However, for this project, accurate representation of daily snow cover change is important in producing the NSRDB. Therefore, NREL also used the Integrated Multisensor Snow and Ice Mapping System data set, which provides daily snow cover observations of the Northern Hemisphere for the temporal extent of the NSRDB (1998-2015). We provide a review of validation studies conducted on these two products and describe the methodology developed by NREL to remap the data products to the NSRDB grid and integrate them into a seamless daily data set.
Book Synopsis Using MODIS BRDF/albedo Data to Evaluate and Improve Land Surface Albedo in Weather and Climate Models by : Zhuo Wang
Download or read book Using MODIS BRDF/albedo Data to Evaluate and Improve Land Surface Albedo in Weather and Climate Models written by Zhuo Wang and published by . This book was released on 2005 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Land surface albedo plays a key role in the surface-atmosphere internaction, because it greatly influences the shortwave radiation absorbed by the surface. Surface albedo depends on soil characteristics and vegetation types. Error in the specification of albedos of soil and vegetation may cause biases in the computation of ground temperature and surface fluxes, therefore accurate albedo estimates are essential for an accurate simulation of the Earth's climate. The study demonstrates the importance of MODIS data in assessing and improving albedo parameterization in weather forecast and climate models as well as the remote sensing retrieval of surface solar fluxes through a series of three papers. First, the NCAR Community Climate System Model (CCSM2) albedo is evaluated using the MODIS BRDF and albedo data. The model and MODIS albedo differences are related to the deficiencies in the model simulation of snow cover and soil moisture and in the model's specification of leaf and stem area indexes. They are also partially caused by the deficiency of the two-stream method. Second, motivated by these analyses, a new formulation for surface albedo is developed. Over desert, most land models assume that the bare soil albedo is a function of soil color and soil moisture but independent of solar zenith angle (SZA). However, analysis of MODIS BRDF/albedo data and in situ data indicates that bare soil albedo does vary with SZA. Furthermore this SZA dependence is found to affect the surface energy fluxes and temperature in the offline land surface model sensitivity tests. Finally, the MODIS BRDF algorithm is reformulated to derive a new two-parameter scheme for the computation of land surface albedo and its SZA dependence for use in weather and climate models as well as the remote sensing retrieval of surface solar fluxes. In this formulation, the season- and pixel-dependent black-sky albedo at 60 deg SZA can be directly prescribed using the MODIS BRDF data while the two parameters are taken as a function of vegetation type only. Comparison of this formulation with those used in weather, climate, and data assimilation models (at NCAR, NCEP, and NASA) as well as those used in remote sensing groups (University of Maryland, ISCCP-FD, and CERES/TRMM) reveals the deficiencies in the land surface albedo treatment in these models and remote sensing retrieval algorithm along with suggestions for improvement.
Book Synopsis Surface albedo derived from TOMS, GOME and MODIS and their application in NO2 retrieval by : H. T. ˜vanœ Dam
Download or read book Surface albedo derived from TOMS, GOME and MODIS and their application in NO2 retrieval written by H. T. ˜vanœ Dam and published by . This book was released on 2005 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721644629 Total Pages :34 pages Book Rating :4.6/5 (446 download)
Book Synopsis Land Surface Albedo from Meris Reflectances Using Modis Directional Factors by : National Aeronautics and Space Administration (NASA)
Download or read book Land Surface Albedo from Meris Reflectances Using Modis Directional Factors written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-21 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: MERIS Level 2 surface reflectance products are now available to the scientific community. This paper demonstrates the production of MERIS-derived surface albedo and Nadir Bidirectional Reflectance Distribution Function (BRDF) adjusted reflectances by coupling the MERIS data with MODIS BRDF products. Initial efforts rely on the specification of surface anisotropy as provided by the global MODIS BRDF product for a first guess of the shape of the BRDF and then make use all of the coincidently available, partially atmospherically corrected, cloud cleared, MERIS observations to generate MERIS-derived BRDF and surface albedo quantities for each location. Comparisons between MODIS (aerosol-corrected) and MERIS (not-yet aerosol-corrected) surface values from April and May 2003 are also presented for case studies in Spain and California as well as preliminary comparisons with field data from the Devil's Rock Surfrad/BSRN site. Schaaf, Crystal L. B. and Gao, Feng and Strahler, Alan H. Goddard Space Flight Center
Book Synopsis Development of a Methodology to Derive Surface Albedo Estimates from Channel 1 and 2 AVHRR Data by : Michel M. Verstraete
Download or read book Development of a Methodology to Derive Surface Albedo Estimates from Channel 1 and 2 AVHRR Data written by Michel M. Verstraete and published by . This book was released on 1991 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Surface Albedo Derived from TOMS, GOME and MODIS and Their Applications in NO2 Retrieval by : H. T. Van Dam
Download or read book Surface Albedo Derived from TOMS, GOME and MODIS and Their Applications in NO2 Retrieval written by H. T. Van Dam and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Long-term Surface Albedo Data Set Derived from AVHRR Observations Over Europe by : Melanie Sütterlin
Download or read book A Long-term Surface Albedo Data Set Derived from AVHRR Observations Over Europe written by Melanie Sütterlin and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation, Improvement, and Application of Surface BRDF and Albedo Retrievals from Modis Observations by : Yufang Jin
Download or read book Evaluation, Improvement, and Application of Surface BRDF and Albedo Retrievals from Modis Observations written by Yufang Jin and published by . This book was released on 2003 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Surface Bidirectional Reflectance and Albedo Properties Derived with MODIS and AERONET Observations and Global Albedo Mapping by : Cheng, Xi
Download or read book Surface Bidirectional Reflectance and Albedo Properties Derived with MODIS and AERONET Observations and Global Albedo Mapping written by Cheng, Xi and published by . This book was released on 2011 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improved Modis Aerosol Retrieval Using Modified Vis/swir Surface Albedo Ratios Over Urban Scenes by : Min Min Oo
Download or read book Improved Modis Aerosol Retrieval Using Modified Vis/swir Surface Albedo Ratios Over Urban Scenes written by Min Min Oo and published by . This book was released on 2009 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Use of in Situ and Airborne Data to Assess Satellite-based Estimates of Directional Reflectance and Albedo by : Miguel O. Román
Download or read book Use of in Situ and Airborne Data to Assess Satellite-based Estimates of Directional Reflectance and Albedo written by Miguel O. Román and published by . This book was released on 2009 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract:Accurate representation of the regional characteristics of anisotropic light scattering by land surfaces under a wide range of sky conditions is required (1) for modeling atmospheric shortwave radiative fluxes; (2) for modeling the energy exchange between the earth and atmosphere; and (3) determining the lower boundary conditions for atmospheric radiative transfer models. However, uncertainties due to spatial scale arise when models that describe the albedo and reflectance anisotropy of land surfaces are directly compared against in-situ measurements. This research focuses on comparisons between satellite, airborne, and ground measurements, namely, MODerate Resolution Imaging Spectroradiometer (MODIS) Bidirectional Reflectance Distribution Function (BRDF) and Albedo products, airborne angular reflectance measurements, and point tower albedo measurements. A new integrated methodology for establishing the spatial representativeness between tower measurements of surface albedo and MODIS retrievals is developed. This method brings together knowledge of the intrinsic biophysical properties of a given spatial domain and its surrounding landscape to produce a number of geostatistical attributes that describe the overall variability, spatial extent, strength, and temporal structure of surface albedo patterns at separated seasonal periods throughout the year. Local upscaling results over a wide range of forested ecosystems demonstrate the ability of this method to identify landscapes that capture the spatial and seasonal features of surface albedo over large enough footprints to be suitable for use in modeling studies. Airborne measurements from NASA's Cloud Absorption Radiometer taken over agricultural and natural landscapes in the Southern Great Plains (SGP) region during the Cloud and Land Surface Interaction Campaign (CLASIC) were utilized to compare the spatial characteristics between finer-scale BRDFs and MODIS retrievals in a well-characterized atmospheric regime. Results confirm that the semi-empirical kernel models used in MODIS data processing generally capture surface heterogeneities. Regional upscaling results across the entire 142,000-square-kilometer SGP domain show consistent agreement, generally meeting pixel-specific accuracy requirements of 0.02 units and realistically accounting for solar zenith angle dependences between spatially-integrated retrievals of surface albedo from 22 evenly distributed facilities and co-located MODIS retrievals. This synergy between local and regional analyses improves the confidence of MODIS retrievals, thus providing the necessary quality controls required by rigorous modeling efforts.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720602965 Total Pages :56 pages Book Rating :4.6/5 (29 download)
Book Synopsis Intercomparison Between in Situ and Avhrr Polar Pathfinder-Derived Surface Albedo Over Greenland by : National Aeronautics and Space Administration (NASA)
Download or read book Intercomparison Between in Situ and Avhrr Polar Pathfinder-Derived Surface Albedo Over Greenland written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Advanced Very High Resolution (AVHRR) Polar Pathfinder Data (APP) provides the first long time series of consistent, calibrated surface albedo and surface temperature data for the polar regions. Validations of these products have consisted of individual studies that analyzed algorithm performance for limited regions and or time periods. This paper reports on comparisons made between the APP-derived surface albedo and that measured at fourteen automatic weather stations (AWS) around the Greenland ice sheet from January 1997 to August 1998. Results show that satellite-derived surface albedo values are on average 10% less than those measured by the AWS stations. However, the station measurements tend to be biased high by about 4% and thus the differences in absolute albedo may be less (e.g. 6%). In regions of the ice sheet where the albedo variability is small, such as the dry snow facies, the APP albedo uncertainty exceeds the natural variability. Further work is needed to improve the absolute accuracy of the APP-derived surface albedo. Even so, the data provide temporally and spatially consistent estimates of the Greenland ice sheet albedo.Stroeve, Julienne C. and Box, Jason E. and Fowler, Charles and Haran, Terence and Key, JefferyGoddard Space Flight CenterALBEDO; POLAR REGIONS; SURFACE TEMPERATURE; ADVANCED VERY HIGH RESOLUTION RADIOMETER; AUTOMATIC WEATHER STATIONS; SATELLITE OBSERVATION
Book Synopsis Best Practices Handbook for the Collection and Use of Solar Resource Data for Solar Energy Applications by : M. Sengupta
Download or read book Best Practices Handbook for the Collection and Use of Solar Resource Data for Solar Energy Applications written by M. Sengupta and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determination of the Single Scattering Albedo and Direct Radiative Forcing of Biomass Burning Aerosol with Data from the MODIS (moderate Resolution Imaging Spectroradiometer) Satellite Instrument by : Li Zhu
Download or read book Determination of the Single Scattering Albedo and Direct Radiative Forcing of Biomass Burning Aerosol with Data from the MODIS (moderate Resolution Imaging Spectroradiometer) Satellite Instrument written by Li Zhu and published by . This book was released on 2013 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biomass burning aerosols absorb and scatter solar radiation and therefore affect the energy balance of the Earth-atmosphere system. The single scattering albedo (SSA), the ratio of the scattering coefficient to the extinction coefficient, is an important parameter to describe the optical properties of aerosols and to determine the effect of aerosols on the energy balance of the planet and climate. Aerosol effects on radiation also depend strongly on surface albedo. Large uncertainties remain in current estimates of radiative impacts of biomass burning aerosols, due largely to the lack of reliable measurements of aerosol and surface properties. In this work we investigate how satellite measurements can be used to estimate the direct radiative forcing of biomass burning aerosols. We developed a method using the critical reflectance technique to retrieve SSA from the Moderate Resolution Imaging Spectroradiometer (MODIS) observed reflectance at the top of the atmosphere (TOA). We evaluated MODIS retrieved SSAs with AErosol RObotic NETwork (AERONET) retrievals and found good agreements within the published uncertainty of the AERONET retrievals. We then developed an algorithm, the MODIS Enhanced Vegetation Albedo (MEVA), to improve the representations of spectral variations of vegetation surface albedo based on MODIS observations at the discrete 0.67, 0.86, 0.47, 0.55, 1.24, 1.64, and 2.12 μm channels. This algorithm is validated using laboratory measurements of the different vegetation types from the Amazon region, data from the Johns Hopkins University (JHU) spectral library, and data from the U.S. Geological Survey (USGS) digital spectral library. We show that the MEVA method can improve the accuracy of flux and aerosol forcing calculations at the TOA compared to more traditional interpolated approaches. Lastly, we combine the MODIS retrieved biomass burning aerosol SSA and the surface albedo spectrum determined from the MEVA technique to calculate TOA flux and aerosol direct radiative forcing over the Amazon region and compare it with Clouds and the Earth's Radiant Energy System (CERES) satellite results. The results show that MODIS based forcing calculations present similar averaged results compared to CERES, but MODIS shows greater spatial variation of aerosol forcing than CERES. Possible reasons for these differences are explored and discussed in this work. Potential future research based on these results is discussed as well.
Book Synopsis ARM Climate Research Facility Spectral Surface Albedo Value-Added Product (VAP) Report by :
Download or read book ARM Climate Research Facility Spectral Surface Albedo Value-Added Product (VAP) Report written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This document describes the input requirements, output data products, and methodology for the Spectral Surface Albedo (SURFSPECALB) value-added product (VAP). The SURFSPECALB VAP produces a best-estimate near-continuous high spectral resolution albedo data product using measurements from multifilter radiometers (MFRs). The VAP first identifies best estimates for the MFR downwelling and upwelling shortwave irradiance values, and then calculates narrowband spectral albedo from these best-estimate irradiance values. The methodology for finding the best-estimate values is based on a simple process of screening suspect data and backfilling screened and missing data with estimated values when possible. The resulting best-estimate MFR narrowband spectral albedos are used to determine a daily surface type (snow, 100% vegetation, partial vegetation, or 0% vegetation). For non-snow surfaces, a piecewise continuous function is used to estimate a high spectral resolution albedo at 1 min temporal and 10 cm-1 spectral resolution.
Book Synopsis Solar Energy Forecasting and Resource Assessment by : Jan Kleissl
Download or read book Solar Energy Forecasting and Resource Assessment written by Jan Kleissl and published by Academic Press. This book was released on 2013-06-25 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar Energy Forecasting and Resource Assessment is a vital text for solar energy professionals, addressing a critical gap in the core literature of the field. As major barriers to solar energy implementation, such as materials cost and low conversion efficiency, continue to fall, issues of intermittency and reliability have come to the fore. Scrutiny from solar project developers and their financiers on the accuracy of long-term resource projections and grid operators’ concerns about variable short-term power generation have made the field of solar forecasting and resource assessment pivotally important. This volume provides an authoritative voice on the topic, incorporating contributions from an internationally recognized group of top authors from both industry and academia, focused on providing information from underlying scientific fundamentals to practical applications and emphasizing the latest technological developments driving this discipline forward. The only reference dedicated to forecasting and assessing solar resources enables a complete understanding of the state of the art from the world’s most renowned experts. Demonstrates how to derive reliable data on solar resource availability and variability at specific locations to support accurate prediction of solar plant performance and attendant financial analysis. Provides cutting-edge information on recent advances in solar forecasting through monitoring, satellite and ground remote sensing, and numerical weather prediction.
Book Synopsis Solar Resources Mapping by : Jesús Polo
Download or read book Solar Resources Mapping written by Jesús Polo and published by Springer. This book was released on 2019-01-22 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents methods for optimising the spatial and network configuration of solar radiation measuring stations. Various physical and mathematical models are demonstrated, which together with high quality measurements, provide the essential tools to generate and validate solar resource estimates to improve the mapping of solar resources. Each chapter deals with a specific topic, showing its methodology, and providing examples of how to apply these techniques with reference to current projects around the world. These topics include: · Radiometric measurement campaigns;· Equipment calibration, installation, operation, and maintenance;· Data quality assurance and assessment;· Solar radiation modelling from satellite images and numerical models;· Downscaling and kriging interpolation of solar radiation;· Simulation of electric solar power plant generation;· Solar radiation forecasting;· Applications of solar energy; and· Socio-economic benefits of solar energy. The contributors present the statistical and physical models needed to derive solar radiation from satellite images and numerical models, emphasising the importance of measuring solar radiation accurately. They also show the classical models used to generate synthetic data, clear sky models and ancillary air quality and meteorological data from different input sources. Solar Resources Mapping provides industry professionals with methodologies and tools to build solar irradiance maps for different applications. The book will also benefit students and researchers as it serves as a main technical reference, presenting the basic terminology and fundamentals for solar resource mapping that include methods for assessing measurement uncertainty.
