| 1980-2010年冬季北极涛动季节内振荡的成因分析 |
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| 引用本文： | 沈新勇,王涛,赵南,黄伟,王乙舒,崔妍.1980-2010年冬季北极涛动季节内振荡的成因分析[J].大气科学学报,2016,39(1):1-7. |
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| 作者姓名： | 沈新勇 王涛 赵南 黄伟 王乙舒 崔妍 |
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| 作者单位： | 南京信息工程大学气象灾害预报预警与评估协同创新中心, 江苏南京 210044;气象灾害教育部重点实验室(南京信息工程大学), 江苏南京 210044;南京信息工程大学气象灾害预报预警与评估协同创新中心, 江苏南京 210044;沈阳区域气候中心, 辽宁沈阳 110016;中国气象科学研究院灾害天气国家重点实验室, 北京 100081;南京信息工程大学气象灾害预报预警与评估协同创新中心, 江苏南京 210044;气象灾害教育部重点实验室(南京信息工程大学), 江苏南京 210044;沈阳区域气候中心, 辽宁沈阳 110016;沈阳农业大学, 辽宁沈阳 110866;沈阳区域气候中心, 辽宁沈阳 110016 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)项目(2015CB453201;2013CB430103);国家自然科学基金资助项目(41175065;41375058;41530427);江苏高等学校优秀科技创新团队计划项目(PIT2014) |
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| 摘 要： | 采用NCEP/NCAR日平均再分析资料,对冬季热带外低频振荡(大气角动量收支及地形力矩)与AO(Arctic Oscillation)指数进行计算,通过功率谱和统计分析发现,它们都存在30~60 d的周期,大气角动量收支与山脉力矩的变化为正相关,且显著响应AO变化。通过动力学诊断分析初步认为,北半球两大地形的山脉力矩作用于纬向大气角动量,副热带纬向西风发生变化,改变南北西风偶极子结构,使得AO产生变化,而且在两大地形中以喜马拉雅山脉地形作用为主。通过对喜马拉雅山脉地区的动力学诊断发现,在高(低)AO指数阶段,喜马拉雅山脉地区激发准定常行星波并作用于副热带西风,导致副热带西风偏弱(偏强),高纬西风偏强(偏弱),因而AO偏强(偏弱),平流层极涡偏强(偏弱),极涡强(弱)中心偏向东北亚。
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| 关 键 词： | 低频振荡 AO 大气角动量 地形力矩 |
| 收稿时间： | 2013/3/6 0:00:00 |
| 修稿时间： | 2013/6/26 0:00:00 |
Cause analysis of AO intraseasonal oscillation in winter of 1980-2010 |
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| SHEN Xinyong,WANG Tao,ZHAO Nan,HUANG Wei,WANG Yishu and CUI Yan.Cause analysis of AO intraseasonal oscillation in winter of 1980-2010[J].大气科学学报,2016,39(1):1-7. |
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| Authors: | SHEN Xinyong WANG Tao ZHAO Nan HUANG Wei WANG Yishu and CUI Yan |
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| Institution: | Collaborative Innovation Center on forecast and Evaluation of Meteorological Disasters, NUIST, Nanjing 210044, China;Key Laboratory of Meteorological Disaster(NUIST), Ministry of Education, Nanjing 210044, China;Collaborative Innovation Center on forecast and Evaluation of Meteorological Disasters, NUIST, Nanjing 210044, China;Shenyang Regional Climate Center, Shenyang 110016, China;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;Collaborative Innovation Center on forecast and Evaluation of Meteorological Disasters, NUIST, Nanjing 210044, China;Key Laboratory of Meteorological Disaster(NUIST), Ministry of Education, Nanjing 210044, China;Shenyang Regional Climate Center, Shenyang 110016, China;Shenyang Agricultural University, Shenyang 110866, China;Shenyang Regional Climate Center, Shenyang 110016, China |
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| Abstract: | Based on the daily NCEP/NCAR reanalysis data,this paper analyzes the extra-tropical low-frequency oscillation(atmospheric angular momentum budget and mountain torque) and AO(Atlantic Oscillation) indices in winter.Power spectrum analysis and correlation analysis show that the dominant variations of them occur in 30-60 d band,and the variation of atmospheric angular momentum budget has positive correlation with the variation of mountain torque and also responds to the variation of AO significantly.Dynamic diagnostic analysis shows that the mountain torque of the two major NH mountain ranges influences zonal atmospheric angular momentum(zonal westerly),and the subtropical westerly and the north-south westerly dipole structure change,so the strength of AO changes.In comparison with the Rockies,the Himalayas play a important role in AO variation.The dynamic diagnosis of the Himalayas ranges shows that,during the period of high(low) AO indices,the quasi-stationary planetary waves forced by the Himalayas ranges influence subtropical westerly,and the subtropical westerly weakens(strengthens) and the high-latitude westerly strengthens(weakens),so AO strengthens(weakens) and the polar vortex in the stratosphere strengthens(weakens).The strong(weak) center of polar vortex tends to Northeast Asia. |
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| Keywords: | low-frequency oscillation AO atmospheric angular momentum mountain torque |
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