| 冬季北大西洋风暴轴的东西变化及其能量诊断 |
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| 引用本文： | 曾鼎文,朱伟军,李耀辉,苟尚,张文波.冬季北大西洋风暴轴的东西变化及其能量诊断[J].气象科学,2015,35(6):691-700. |
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| 作者姓名： | 曾鼎文 朱伟军 李耀辉 苟尚 张文波 |
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| 作者单位： | 中国气象局 兰州干旱气象研究所 甘肃省干旱气候变化与减灾重点实验室 中国气象局干旱气候变化与减灾重点开放实验室, 兰州 730020,南京信息工程大学 气象灾害省部共建教育部重点实验室, 南京 210044,中国气象局 兰州干旱气象研究所 甘肃省干旱气候变化与减灾重点实验室 中国气象局干旱气候变化与减灾重点开放实验室, 兰州 730020,兰州中心气象台, 兰州 730020,甘肃省气象服务中心, 兰州 730020 |
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| 基金项目： | 国家自然基金面上项目(41375019);中国气象局兰州干旱气象研究所科研启动基金(sys2013ssky02);国家自然科学基金资助项目(41575070);公益性行业(气象)科研专项(GYHY201306028);江苏高校优势学科建设工程资助项目(PAPD) |
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| 摘 要： | 利用NCEP/NCAR再分析资料,定义一个风暴轴经度指数,基于这个指数做合成分析,对冬季北大西洋风暴轴63 a(1948-2010年)的东西变化特征及其能量平衡差异进行了诊断。主要结论如下:(1)北大西洋风暴轴存在明显地东扩和西退。当风暴轴向东扩展时,天气尺度瞬变波可以向下游发展至乌拉尔山以东的亚洲上空;风暴轴西退时,天气尺度瞬变波活动范围向西收缩到15°W以西的大洋上空。(2)能量诊断表明,当风暴轴向东扩展时,涡动动能在高纬度的大西洋东部及西欧上空明显增强。在0°以西的区域,涡动动能的增强主要归因于能量斜压转换过程的增强;而在0°以东区域,涡动动能的增强可能与涡动非地转位势通量引起的"下游发展效应"增强有关。风暴轴向西收缩时,变化相反。
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| 关 键 词： | 大气环流 大西洋风暴轴 合成分析 能量诊断 |
| 收稿时间： | 4/9/2014 12:00:00 AM |
| 修稿时间： | 7/8/2014 12:00:00 AM |
Zonal variations and its energy budget analysis of North Atlantic storm track in winter |
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| ZENG Dingwen,ZHU Weijun,LI Yaohui,GOU Shang and ZHANG Wenbo.Zonal variations and its energy budget analysis of North Atlantic storm track in winter[J].Scientia Meteorologica Sinica,2015,35(6):691-700. |
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| Authors: | ZENG Dingwen ZHU Weijun LI Yaohui GOU Shang and ZHANG Wenbo |
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| Institution: | Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Key Open Laboratory of Arid Climate Change and Disaster of China Meteorological Administration/Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China,Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, China,Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Key Open Laboratory of Arid Climate Change and Disaster of China Meteorological Administration/Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China,Lanzhou Central Meteorological Observation, Lanzhou 730020, China and Gansu Meteorological Service Center, Lanzhou 730020, China |
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| Abstract: | Based on NCEP/NCAR reanalysis data and a self-defined storm track longitude index (IX), a synthetic analysis was made to conduct an investigation on zonal variability of Atlantic storm track (AST) and its energy budget difference during boreal winters of the past 63 years (1948-2010). Results show that (1) the AST swings markedly in the east-west direction. When it expands eastward, the synoptic transient waves extend from Atlantic to Asia over the east of the Ural in the sky; while it retreats westward, the synoptic transient waves draw back to the west of 15° W over the ocean. (2) The energy budget analysis shows that the remarkable increase of the eddy kinetic energy over eastern Atlantic and western Europe at high latitudes corresponds to the eastern enlargement of the storm track. The intensification of eddy kinetic energy in the west of 0° is largely attributed to the strengthening of barotropic conversion, while in the east of 0°, the "downstream development effect" caused by the eddy ageostrophic geopotential fluxes may play the most crucial role. Vice versa while the AST retreats. |
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| Keywords: | Atmospheric circulation Atlantic storm track Composite analysis Energy budget analysis |
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