收藏本站
《第七次全国动力气象学术会议论文摘要》 2009年
收藏 | 手机打开
二维码
手机客户端打开本文

Sensitivity of MJO Simulations to Diabatic Heating Profiles

李崇银  
【摘要】:正The difficulty for global atmospheric models to reproduce the Madden-Julian Oscillation (MJO)is a long-lasting problem.In an attempt to understand this difficulty,simple numerical experiments are conducted using a global climate model.This model,in its full paramterization package(control run),is capable of producing the gross features of the MJO,namely,its planetary-scale,intraseasonal,eastward slow propagation.When latent heating profiles in the model are artificially modified,the characteristics of the simulated MJO changed drastically. Intraseasonal perturbations are dominated by stationary component over the Indian and western Pacific Oceans when heating profiles are top heavy(maximum in the upper troposphere).In contrast,when diabatic heating is bottom heavy(maximum in the lower troposphere), planetary-scale,intraseasonal,eastward propagating perturbations similar to the MJO are reproduced with a realistic phase speed.These sensitivity experiments,along with other theoretical. numerical,and observational results,have led to a hypothesis that the difficulty for global models to produce the MJO partially comes from a lack of sufficient diabatic heating in the lower troposphere,which presumably is from shallow convection.

知网文化
中国知网广告投放
 快捷付款方式  订购知网充值卡  订购热线  帮助中心
  • 400-819-9993
  • 010-62982499
  • 010-62783978