globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2017MS001176
Scopus记录号: 2-s2.0-85040538306
论文题名:
Sensitivity of Coupled Tropical Pacific Model Biases to Convective Parameterization in CESM1
作者: Woelfle M; D; , Yu S; , Bretherton C; S; , Pritchard M; S
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2018
卷: 10, 期:1
起始页码: 126
结束页码: 144
语种: 英语
英文关键词: Fighter aircraft ; Heat convection ; Momentum ; Momentum transfer ; Parameterization ; Pressure gradient ; Surface waters ; Wind stress ; Cold tongue ; Hindcasts ; ITCZ ; Momentum transports ; Superparameterization ; Oceanography ; advection ; atmosphere-ocean coupling ; atmosphere-ocean system ; atmospheric convection ; climate modeling ; cold air ; convection ; flux measurement ; hindcasting ; intertropical convergence zone ; momentum ; oceanic convection ; parameterization ; pressure gradient ; sea surface temperature ; sensitivity analysis ; surface wind ; three-dimensional modeling ; Pacific Ocean ; Pacific Ocean (Equatorial)
英文摘要: Six month coupled hindcasts show the central equatorial Pacific cold tongue bias development in a GCM to be sensitive to the atmospheric convective parameterization employed. Simulations using the standard configuration of the Community Earth System Model version 1 (CESM1) develop a cold bias in equatorial Pacific sea surface temperatures (SSTs) within the first two months of integration due to anomalous ocean advection driven by overly strong easterly surface wind stress along the equator. Disabling the deep convection parameterization enhances the zonal pressure gradient leading to stronger zonal wind stress and a stronger equatorial SST bias, highlighting the role of pressure gradients in determining the strength of the cold bias. Superparameterized hindcasts show reduced SST bias in the cold tongue region due to a reduction in surface easterlies despite simulating an excessively strong low-level jet at 1-1.5 km elevation. This reflects inadequate vertical mixing of zonal momentum from the absence of convective momentum transport in the superparameterized model. Standard CESM1simulations modified to omit shallow convective momentum transport reproduce the superparameterized low-level wind bias and associated equatorial SST pattern. Further superparameterized simulations using a three-dimensional cloud resolving model capable of producing realistic momentum transport simulate a cold tongue similar to the default CESM1. These findings imply convective momentum fluxes may be an underappreciated mechanism for controlling the strength of the equatorial cold tongue. Despite the sensitivity of equatorial SST to these changes in convective parameterization, the east Pacific double-Intertropical Convergence Zone rainfall bias persists in all simulations presented in this study. © 2017. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75681
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Department of Earth System Science, University of California-Irvine, Irvine, CA, United States; Department of Applied Mathematics, University of Washington, Seattle, WA, United States

Recommended Citation:
Woelfle M,D,, Yu S,et al. Sensitivity of Coupled Tropical Pacific Model Biases to Convective Parameterization in CESM1[J]. Journal of Advances in Modeling Earth Systems,2018-01-01,10(1)
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