| 中高纬大气ISO对夏季鄂海阻高形成和维持的调节作用 |
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| 引用本文： | 杨双艳,李天明.中高纬大气ISO对夏季鄂海阻高形成和维持的调节作用[J].大气科学学报,2020,43(1):104-115. |
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| 作者姓名： | 杨双艳 李天明 |
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| 作者单位： | 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心,江苏南京210044;南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心,江苏南京210044;夏威夷大学马诺阿分校大气科学学院国际太平洋研究中心,檀香山夏威夷96822 |
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| 基金项目： | 国家重点研发计划（2018YFC1505803）；江苏省高校自然科学基金资助项目（18KJB170015）；南京信息工程大学人才引进启动基金（2018R027） |
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| 摘 要： | 运用1979—2015年的逐日NCEP-DOE再分析资料,探讨了夏季鄂霍次克海阻塞高压(简称“鄂海阻高”)与中高纬大气季节内振荡(简称“ISO”)之间的可能联系。研究发现,ISO扰动与夏季鄂海阻高在关键区(130°~160°E,60°~75°N)有最好的耦合关系,且关键区位势高度表现出显著的10~30 d的振荡周期。超前滞后合成分析表明,与鄂海阻高相联系的ISO扰动具有明显的向西传播的特征。波活动通量分析结果显示,波能量在中高纬140°W附近累积,因此西传的ISO扰动可能源自中高纬140°W附近。对位势倾向方程的诊断结果显示,动力作用对关键区位势高度的时间变化起主要作用。进一步运用尺度分析表明,在夏季鄂海阻高发生和维持的过程中,ISO经向风引导的平均涡度平流对位势高度的时间变化起主导作用。
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| 关 键 词： | 鄂海阻高 中高纬季节内振荡 波活动通量 位势倾向诊断 |
| 收稿时间： | 2019/10/1 0:00:00 |
| 修稿时间： | 2019/12/11 0:00:00 |
The role of intraseasonal oscillation at mid-high latitudes in regulating the formation and maintenance of Okhotsk blocking in boreal summer |
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| YANG Shuangyan,LI Tim.The role of intraseasonal oscillation at mid-high latitudes in regulating the formation and maintenance of Okhotsk blocking in boreal summer[J].大气科学学报,2020,43(1):104-115. |
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| Authors: | YANG Shuangyan LI Tim |
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| Institution: | Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster(CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, China and Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster(CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, China;International Pacific Research Center, Department of Atmospheric Sciences, University of Hawaii at Manoa, Honolulu 96822, USA |
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| Abstract: | In this study,by using daily data from the Department of Energy Reanalysis at the National Center for Environmental Prediction,dating from 1979 to 2015,we investigated the connection between Okhotsk blockings and mid-high latitude atmospheric intraseasonal oscillation(ISO) in the boreal winter.The results showed that the ISO perturbation over a key area of 60°-75°N,130°-160°E is the most greatly co-variated with Okhotsk blockings.The averaged geopotential height over this key area exhibits a statistically significant 10 to 30-day periodicity.By applying lead-lag composite analysis,it is revealed that the ISO perturbation associated with the Okhotsk blocking activity exhibits pronounced westward propagation.The perturbation initiates at about 140°W,triggered by intraseasonal wave energy accumulation.A geopotential tendency diagnosis reveals that the time change rate of the geopotential height over the key area is primarily attributed to the dynamic process.In addition,the results of a scale analysis show that the advection of mean vorticity by the ISO meridional flow plays a dominant role in the time change rate of the geopotential height during the occurrence and maintenance of the summertime Okhotsk blockings. |
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| Keywords: | Okhotsk blocking intraseasonal oscillation at mid-high latitude wave activity flux diagnosis of geopotential endency |
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