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| New Evidence for Improving Omega Estimation by Explicitly Considering Horizontal Divergence简 | |
| 引用本文： | YUAN Zhuojian,QI Jindian,GAO Shouting,FENG Yerong,XU Pengcheng,and WU Naigeng. New Evidence for Improving Omega Estimation by Explicitly Considering Horizontal Divergence简[J]. 大气科学进展, 2014, 31(2): 449-456. DOI: 10.1007/s00376-013-3003-5 |
| 作者姓名： | YUAN Zhuojian QI Jindian GAO Shouting FENG Yerong XU Pengcheng and WU Naigeng |
| 基金项目： | supported by the National Key Basic Research Project of China (Grant No. 2009CB 421404);the Chinese NSF key project (Grant Nos. 40930950 and 40730951);the Chinese NSF (Grant Nos. 40775031 and 40575021) |
| 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： | 欧米茄 证据 天气尺度系统 三岔口 估计 垂直运动 再分析资料 温度平流 |
New evidence for improving omega estimation by explicitly considering horizontal divergence |
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| Zhuojian Yuan,Jindian Qi,Shouting Gao,Yerong Feng,Pengcheng Xu,Naigeng Wu. New evidence for improving omega estimation by explicitly considering horizontal divergence[J]. Advances in Atmospheric Sciences, 2014, 31(2): 449-456. DOI: 10.1007/s00376-013-3003-5 | |
| Authors: | Zhuojian Yuan Jindian Qi Shouting Gao Yerong Feng Pengcheng Xu Naigeng Wu |
| Affiliation: | 1. Center for Monsoon and Regional Environment/Department of Atmospheric Science, Sun Yat-sen University, Guangzhou, 510275, China 2. Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China 3. Guangdong Meteorological Observatory, Guangzhou, 510080, China 4. Institute of Applied Mathematics, Academy of Mathematics and Systems Sciences, Chinese Academy of Sciences, Beijing, 100190, China |
| Abstract: | 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. |
| Keywords: | omega estimation weather forecast horizontal divergence vertical motion |
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