DOI: 10.1175/JCLI-D-13-00737.1
Scopus记录号: 2-s2.0-84903388432
论文题名: Evaluation of the tropical TOA flux diurnal cycle in MERRA and ERA-interim retrospective analyses
作者: Itterly K.F. ; Taylor P.C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 13 起始页码: 4781
结束页码: 4796
语种: 英语
Scopus关键词: Climatology
; Clouds
; Errors
; NASA
; Clouds and the Earth's radiant energy systems
; Diurnal effects
; Equatorial Pacific Ocean
; Marine stratocumulus clouds
; Model evaluation/performance
; Outgoing longwave radiation
; Radiative fluxes
; Reanalysis
; Tropics
; atmospheric convection
; climatology
; cloud cover
; diurnal variation
; error analysis
; longwave radiation
; modeling
; radiative forcing
; stratocumulus
英文摘要: Reanalysis model output is extensively used in atmospheric research and must be rigorously and continuously evaluated to understand the strengths and weaknesses. This paper evaluates the tropical top-ofatmosphere (TOA) flux diurnal cycle in NASA's Modern-Era Retrospective Analysis for Research and Applications (MERRA) and the ECMWF Interim Re-Analysis (ERA-Interim) against Clouds and the Earth's Radiant Energy System (CERES) synoptic edition 3A (SYN Ed3A) TOA flux data. MERRA and ERA-Interim are able to reproduce large-scale features of the diurnal cycle, including land-ocean contrast. MERRA and ERA-Interim, however, fail to reproduce many regional features of the climatological annual diurnal cycle. The TOA flux diurnal cycle errors in regions dominated by convective diurnal cycles are 5-10 times larger than in nonconvective regions. These errors in the TOA radiative flux diurnal cycle are primarily attributed to errors in the cloud diurnal evolution and specifically the failure to reproduce diurnally forced propagating convection. The largest diurnal cycle errors are found in ocean convective regions (e.g., Indian and equatorial Pacific Oceans); the observed longwave cloud forcing (LWCF) diurnal evolution in several oceanic convective regions shows two peaks: an afternoon and a near midnight peak; however, the reanalysis models produce a single midnight peak. The outgoing longwave radiation (OLR) diurnal cycle over tropical land is 20%-30% too weak in both reanalyses. The small diurnal cycle errors in marine stratocumulus regions are a result of two common misrepresentations in MERRA and ERA-Interim: 1) the dissipation of marine stratocumulus clouds from morning to afternoon is too slow and 2) the cloud diurnal cycle is too weak. Overall, the intermodel differences in the representation of the TOA flux diurnal cycle are smaller than the differences between reanalysis models and observations. © 2014 American Meteorological Society. 资助项目: NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51113
Appears in Collections: 气候变化事实与影响
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作者单位: Climate Science Branch, NASA Langley Research Center, SSAI, Hampton, VA, United States
Recommended Citation:
Itterly K.F.,Taylor P.C.. Evaluation of the tropical TOA flux diurnal cycle in MERRA and ERA-interim retrospective analyses[J]. Journal of Climate,2014-01-01,27(13)