中国科学院南海海洋研究所机构知识库
Advanced  
SCSIO OpenIR  > 海洋科技动态信息-印太暖池系统研究  > 期刊论文
学科主题: Meteorology & Atmospheric Sciences
题名: What are the sources of mechanical damping in Matsuno-Gill-type models?
作者: Lin, JL ; Mapes, BE ; Han, WQ
通讯作者: lin.789@osu.edu
刊名: JOURNAL OF CLIMATE
发表日期: 2008-01-01
卷: 21, 期:2, 页:165-179
收录类别: sci
部门归属: [Lin, Jia-Lin] NOAA ESRL CIRES Climate Diag Ctr, Boulder, CO USA; [Mapes, Brian E.] Univ Miami, RSMAS, Miami, FL 33152 USA; [Han, Weiqing] Univ Colorado, DAOS, Boulder, CO 80309 USA
摘要: The Matsuno-Gill model has been widely used to study the tropical large-scale circulations and atmosphere-ocean interactions. However, a common critique of this model is that it requires a strong equivalent linear mechanical damping to get realistic wind response and it is unclear what could provide such a strong damping above the boundary layer. This study evaluates the sources and strength of equivalent linear mechanical damping in the Walker circulation by calculating the zonal momentum budget using 15 yr (1979-93) of daily global reanalysis data. Two different reanalyses [NCEP-NCAR and 15-yr ECMWF Re-Analysis (ERA-15)] give qualitatively similar results for all major terms, including the budget residual, whose structure is consistent with its interpretation as eddy momentum flux convergence by convective momentum transport (CMT). The Walker circulation is characterized by two distinct regions: a deep convection region over the Indo-Pacific warm pool and a shallow convection region over the eastern Pacific cold tongue. These two regions are separated by a strong upper-tropospheric ridge and a strong lower-tropospheric trough in the central Pacific. The resultant pressure gradient forces on both sides require strong (approximately 5-10 days) damping to balance them because Coriolis force near the equator is too small to provide the balance. In the deep convection region, the damping is provided by CMT and advection together in both the upper and lower troposphere. In the shallow convection region, on the other hand, the damping is provided mainly by advection in the upper troposphere and by CMT in the lower troposphere. In other words, the upperlevel tropical easterly jet and the low-level trade wind are both braked by CMT. These results support the use of strong damping in the Matsuno-Gill-type models but suggest that the damping rate is spatially inhomogeneous and the CMT-related damping increases with the strength of convection. Implications for GCM's simulation of tropical mean climate are discussed.
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/8439
Appears in Collections:海洋科技动态信息-印太暖池系统研究_期刊论文

Files in This Item: Download All
File Name/ File Size Content Type Version Access License
What are the sources of mechanical damping in Matsuno-Gill-type models.pdf(2300KB)----开放获取--View Download

Recommended Citation:
Lin, JL; Mapes, BE; Han, WQ.What are the sources of mechanical damping in Matsuno-Gill-type models?,JOURNAL OF CLIMATE,2008,21(2):165-179
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Lin, JL]'s Articles
[Mapes, BE]'s Articles
[Han, WQ]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Lin, JL]‘s Articles
[Mapes, BE]‘s Articles
[Han, WQ]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit
文件名: What are the sources of mechanical damping in Matsuno-Gill-type models.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2018  中国科学院南海海洋研究所 - Feedback
Powered by CSpace