globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-14-00623.1
Scopus记录号: 2-s2.0-84944096201
论文题名:
Evaluating observation influence on regional water budgets in reanalyses
作者: Bosilovich M.G.; Chern J.-D.; Mocko D.; Robertson F.R.; Da Silva A.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期:9
起始页码: 3631
结束页码: 3649
语种: 英语
Scopus关键词: Infrared devices ; Infrared instruments ; Moisture ; Plasma diagnostics ; Sounding apparatus ; Water vapor ; Atmospheric infrared sounders ; Data assimilation ; Forecast departures ; Observing system experiments ; Observing systems ; Physical process ; Reanalysis ; Water budget ; Budget control ; AIRS ; AMSU ; data assimilation ; data set ; moisture flux ; precipitation assessment ; water budget ; water vapor ; United States
英文摘要: The assimilation of observations in reanalyses incurs the potential for the physical terms of budgets to be balanced by a term relating the fit of the observations relative to a forecast first guess analysis. This may indicate a limitation in the physical processes of the background model or perhaps assimilating data from an inconsistent observing system. In the MERRAreanalysis, an area of long-term moisture flux divergence over land has been identified over the central United States. Here, the water vapor budget is evaluated in this region, taking advantage of two unique features of the MERRA diagnostic output: 1) a closed water budget that includes the analysis increment and 2) a gridded diagnostic output dataset of the assimilated observations and their innovations (e.g., forecast departures). In the central United States, an anomaly occurs where the analysis adds water to the region, while precipitation decreases and moisture flux divergence increases. This is related more to a change in the observing system than to a deficiency in the model physical processes. MERRA's Gridded Innovations and Observations (GIO) data narrow the observations that influence this feature to the ATOVSand Aqua satellites during the 0600 and 1800 UTC analysis cycles, when radiosonde information is not prevalent. Observing system experiments further narrow the instruments that affect the anomalous feature to AMSU-A (mainly window channels) and Atmospheric Infrared Sounder (AIRS). This effort also shows the complexities of the observing system and the reactions of the regional water budgets in reanalyses to the assimilated observations. © 2015 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50735
Appears in Collections:气候变化事实与影响

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作者单位: Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, MD, United States; SAIC, Greenbelt, MD, United States; Global Modeling and Assimilation Office, Greenbelt, MD, United States; NASA Marshall Space Flight Center, Huntsville, AL, United States

Recommended Citation:
Bosilovich M.G.,Chern J.-D.,Mocko D.,et al. Evaluating observation influence on regional water budgets in reanalyses[J]. Journal of Climate,2015-01-01,28(9)
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