DOI: 10.1175/JCLI-D-17-0417.1
Scopus记录号: 2-s2.0-85041952148
论文题名: Origins of coupled model biases in the Arabian Sea climatological state
作者: Nagura M. ; Mccreary J.P. ; Annamalai H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 5 起始页码: 2005
结束页码: 2029
语种: 英语
英文关键词: Coupled models
; Indian Ocean
; Model errors
; Model output statistics
; Oceanic mixed layer
; Thermocline
Scopus关键词: Climate models
; Climatology
; Temperature distribution
; Coupled models
; Indian ocean
; Model errors
; Model output statistics
; Oceanic mixed layers
; Surface waters
; atmospheric modeling
; climatology
; cooling
; mixed layer
; monsoon
; rainfall
; salinity
; sea surface temperature
; summer
; water mass
; winter
; Arabian Sea
; Indian Ocean
; Persian Gulf
英文摘要: This study investigates biases of the climatological mean state of the northern Arabian Sea (NAS) in 31 coupled ocean-atmosphere models. The focus is to understand the cause of the large biases in the depth of the 20° isotherm (ΔD20) that occur in many of them. Other prominent biases are the depth (hPG) and temperature (TPG) of Persian Gulf water (PGW) and the wintertime mixed-layer thickness (MLT) along the northern boundary. For models that lack a Persian Gulf (group 1), ΔD20 is determined by the wintertime MLT bias (ΔMLT) through the formation of an Arabian Sea high-salinity water mass (ASHSW) that is too deep. For models with a Persian Gulf (group 2), if hPG . MLT (group 2B), PGW remains mostly trapped to the western boundary and, again, ΔMLT directly controls ΔD20. If hPG ≲ MLT (group 2A), PGW spreads into the NAS and impacts ΔD20 because TPG > 20°C; nevertheless DMLTstill influences ΔD20 indirectly through its impact on hPG. The thick wintertime mixed layer is driven primarily by surface cooling Q during the fall. Nevertheless, variations in ΔMLT among the models are more strongly linked to biases in the density stratification (jump) across the bottom of the mixed layer than toQbiases. The jump is in turn determined primarily by sea surface salinity biases (ΔSSS) advected into the NAS by the West India Coastal Current, and the source of DSSS is the rainfall deficit associated with the models' weak summer monsoon. Ultimately, then, ΔD20 is linked to this deficit. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111643
Appears in Collections: 气候减缓与适应
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作者单位: Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan; International Pacific Research Center, University of Hawai'i at Manoa, Honolulu, HI, United States; International Pacific Research Center, Department of Oceanography, University of Hawai'i at Manoa, Honolulu, HI, United States
Recommended Citation:
Nagura M.,Mccreary J.P.,Annamalai H.. Origins of coupled model biases in the Arabian Sea climatological state[J]. Journal of Climate,2018-01-01,31(5)