The diurnal cycle of precipitation over the Maritime Continent in a high-resolution atmospheric model

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 海洋科技动态信息-印太暖池系统研究

	The diurnal cycle of precipitation over the Maritime Continent in a high-resolution atmospheric model
	Lister, GMS; Love, BS; Matthews, AJ; b.love@uea.ac.uk
刊名	QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY
	2011
卷号	137 期号:657 页码:934-947
关键词	Gravity Wave Sea Breeze Cascade Project Unified Model
ISSN号	0035-9009
英文摘要	Climate models can exhibit systematic errors in their mean precipitation over the Maritime Continent of the Indonesian archipelago at the heart of the tropical warm pool. These can often be traced back to an erroneous simulation of the diurnal cycle, and can lead to errors in global climate, through planetary wave propagation. Here, we examine the simulation of the diurnal cycle over the Maritime Continent in a series of high-resolution integrations of the UK Met Office atmospheric model, with horizontal resolutions of 40 and 12 km (where the convection is parametrised) and 4 km (where the convection is explicitly resolved), as part of the Cascade project. In these models, the vertical heating profile over the islands changes from a convective profile with a mid-tropospheric maximum in the early afternoon to a more stratiform profile with upper-tropospheric heating and mid-tropospheric cooling later. The convective heating profile forces a first internal mode gravity wave that propagates rapidly offshore; the deep warm anomalies behind its downwelling wavefront suppress convection offshore during early afternoon. The stratiform heating profile forces a gravity wave with a higher-order vertical mode that propagates slowly offshore later in the afternoon. This mode has a negative, destabilising temperature anomaly in the mid-troposphere. Together with the convergence zone between the wave fronts of the two modes, favourable conditions are created for offshore convection. In the 4 km explicit convection model, the offshore convection responds strongly to this gravity wave forcing, in agreement with observations, supporting a gravity wave-convection paradigm for the diurnal cycle over the Maritime Continent. However, the convective response in the lower-resolution models is much less coherent, leading to errors in the diurnal cycle and mean precipitation. Hence, to improve climate model simulations, sensitivity to gravity wave forcing should be a factor in future convective parametrisation schemes. Copyright (C) 2011 Royal Meteorological Society
学科主题	Meteorology & Atmospheric Sciences
URL标识	查看原文
公开日期	2011-07-14
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/8375]
专题	南海海洋研究所_海洋科技动态信息-印太暖池系统研究
通讯作者	b.love@uea.ac.uk
推荐引用方式 GB/T 7714	Lister, GMS,Love, BS,Matthews, AJ,et al. The diurnal cycle of precipitation over the Maritime Continent in a high-resolution atmospheric model[J]. QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY,2011,137(657):934-947.
APA	Lister, GMS,Love, BS,Matthews, AJ,&b.love@uea.ac.uk.(2011).The diurnal cycle of precipitation over the Maritime Continent in a high-resolution atmospheric model.QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY,137(657),934-947.
MLA	Lister, GMS,et al."The diurnal cycle of precipitation over the Maritime Continent in a high-resolution atmospheric model".QUARTERLY JOURNAL OF THE ROYAL METEOROLOGICAL SOCIETY 137.657(2011):934-947.