New Evidence for Improving Omega Estimation by Explicitly Considering Horizontal Divergence

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	New Evidence for Improving Omega Estimation by Explicitly Considering Horizontal Divergence
其他题名	New Evidence for Improving Omega Estimation by Explicitly Considering Horizontal Divergence
	Yuan Zhuojian 1; Qi Jindian 1; Gao Shouting 2; Feng Yerong 1; Xu Pengcheng3 ; Wu Naigeng 1
	2014
发表期刊	ADVANCES IN ATMOSPHERIC SCIENCES
ISSN	0256-1530
卷号	31 期号:2 页码:449-456
摘要	It is well known that the quasi-geostrophic (QG) omega equation with only two contributors respectively associated with vorticity advection (VA) and temperature advection is derived for midlatitude synoptic-scale systems only. Based on reliable reanalysis data, new evidence revealed by cyclonic and anticyclonic cases indicates that forecasters might sometimes experience problems by paying too much attention to the 500-hPa VA when estimating vertical motions not only in subtropical systems but also in systems meeting all the assumptions of the QG omega equation. Our investigations also showed that explicitly considering the vertical profiles of horizontal divergence could allow for better interpretation of vertical motions and weather in these real cases, suggesting that this equation might not be sufficient due to the presence of only two horizontal-divergence-related (HDR) mechanisms and the absence of other HDR mechanisms, e. g., frictional force, mountain barriers, diabatic/adiabatic processes, and acceleration/deceleration of air flows.
其他摘要	It is well known that the quasi-geostrophic (QG) omega equation with only two contributors respectively associated with vorticity advection (VA) and temperature advection is derived for midlatitude synoptic-scale systems only. Based on reliable reanalysis data, new evidence revealed by cyclonic and anticyclonic cases indicates that forecasters might sometimes experience problems by paying too much attention to the 500-hPa VA when estimating vertical motions not only in subtropical systems but also in systems meeting all the assumptions of the QG omega equation. Our investigations also showed that explicitly considering the vertical profiles of horizontal divergence could allow for better interpretation of vertical motions and weather in these real cases, suggesting that this equation might not be sufficient due to the presence of only two horizontaldivergence-related (HDR) mechanisms and the absence of other HDR mechanisms, e.g., frictional force, mountain barriers, diabatic/adiabatic processes, and acceleration/deceleration of air flows.
关键词	VERTICAL MOTIONS EQUATION CYCLONE WINTER MODEL omega estimation weather forecast horizontal divergence vertical motion
收录类别	CSCD
语种	英语
资助项目	[National Key Basic Research Project of China] ; [Chinese NSF key project] ; [Chinese NSF]
CSCD记录号	CSCD:5049620
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/55878
专题	应用数学研究所
作者单位	1.辽宁省地震局 2.中国科学院大气物理研究所 3.中国科学院数学与系统科学研究院
推荐引用方式 GB/T 7714	Yuan Zhuojian,Qi Jindian,Gao Shouting,et al. New Evidence for Improving Omega Estimation by Explicitly Considering Horizontal Divergence[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2014,31(2):449-456.
APA	Yuan Zhuojian,Qi Jindian,Gao Shouting,Feng Yerong,Xu Pengcheng,&Wu Naigeng.(2014).New Evidence for Improving Omega Estimation by Explicitly Considering Horizontal Divergence.ADVANCES IN ATMOSPHERIC SCIENCES,31(2),449-456.
MLA	Yuan Zhuojian,et al."New Evidence for Improving Omega Estimation by Explicitly Considering Horizontal Divergence".ADVANCES IN ATMOSPHERIC SCIENCES 31.2(2014):449-456.