globalchange  > 影响、适应和脆弱性
DOI: 10.1002/jgrd.50697
论文题名:
Correcting surface solar radiation of two data assimilation systems against FLUXNET observations in North America
作者: Zhao L.; Lee X.; Liu S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期:17
起始页码: 9552
结束页码: 9564
语种: 英语
英文关键词: clearness index ; FLUXNET ; global energy budget ; reanalysis ; surface solar radiation
Scopus关键词: Algorithms ; Energy balance ; Sun ; Clearness indices ; FluxNet ; Global energy budget ; Reanalysis ; Surface solar radiation ; Solar radiation ; algorithm ; atmospheric correction ; data assimilation ; energy efficiency ; error analysis ; measurement method ; numerical model ; observational method ; shortwave radiation ; solar radiation ; North America
英文摘要: Solar radiation at the Earth's surface is an important driver of meteorological and ecological processes. The objective of this study is to evaluate the accuracy of the reanalysis solar radiation produced by NARR (North American Regional Reanalysis) and MERRA (Modern-Era Retrospective Analysis for Research and Applications) against the FLUXNET measurements in North America. We found that both assimilation systems systematically overestimated the surface solar radiation flux on the monthly and annual scale, with an average bias error of +37.2 Wm-2 for NARR and of +20.2 Wm-2 for MERRA. The bias errors were larger under cloudy skies than under clear skies. A postreanalysis algorithm consisting of empirical relationships between model bias, a clearness index, and site elevation was proposed to correct the model errors. Results show that the algorithm can remove the systematic bias errors for both FLUXNET calibration sites (sites used to establish the algorithm) and independent validation sites. After correction, the average annual mean bias errors were reduced to +1.3 Wm-2 for NARR and +2.7 Wm-2 for MERRA. Applying the correction algorithm to the global domain of MERRA brought the global mean surface incoming shortwave radiation down by 17.3 W m-2 to 175.5 W m-2. Under the constraint of the energy balance, other radiation and energy balance terms at the Earth's surface, estimated from independent global data products, also support the need for a downward adjustment of the MERRA surface solar radiation. Key Points NARR and MERRA systematically overestimated the surface incoming solar radiationA simple post-reanalysis correction algorithm was proposedGlobal surface energy balance was revised according to the correction ©2013. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63336
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: School of Forestry and Environmental Studies, Yale University, 21 Sachem St., New Haven, CT 06511, United States; Yale-NUIST Center on Atmospheric Environment, Nanjing University of Information Science and Technology, Nanjing, China

Recommended Citation:
Zhao L.,Lee X.,Liu S.. Correcting surface solar radiation of two data assimilation systems against FLUXNET observations in North America[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(17)
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