| 西北太平洋热带气旋活动对大尺度环境场影响的线性回归分析 |
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| 引用本文： | 孙行知,钟中,江静.西北太平洋热带气旋活动对大尺度环境场影响的线性回归分析[J].地球物理学报,2017,60(3):903-911. |
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| 作者姓名： | 孙行知 钟中 江静 |
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| 作者单位： | 1. 解放军理工大学气象海洋学院, 南京 211101;2. 南京大学江苏省气候变化协同创新中心, 南京 210023 |
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| 基金项目： | 国家自然科学基金（41430426）和公益性行业（气象）专项（GYHY201306025）资助. |
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| 摘 要： | 本文使用西北太平洋累积气旋能量(ACE)月尺度异常序列,对850 hPa相对涡度、地表纬向风、柱水汽含量、OLR、降水和SST等大尺度环境场变量进行时滞回归分析,讨论了月尺度TC活动对大尺度环境场的影响及其与周尺度的区别和联系.结果表明:(1)月尺度ACE回归出的纬向风无论是强度还是范围都要明显大于周尺度ACE回归结果,TC的频繁发生,尤其是强度大且持续时间长的近赤道TC,对于激发或加强TC活动区域南侧的低纬地区西风异常有一定的积极作用,持续并且强度较大的西风异常可能导致西风的爆发,而西风爆发会在很大程度上影响ENSO事件的发生和演变.(2)在月尺度上,OLR、柱水汽含量、降水和SST等物理量均呈现出较为明显的E1Nino型分布,而在周尺度上,仅SST呈现出明显的El Nino型分布,这在一定程度上反映了月尺度TC活动和太平洋ENSO信号之间存在更密切的关联.(3)在TC发生后1-2月,TC的主要生成区域柱水汽含量减少、OLR增大,这会在一定程度上降低该区域生成TC的潜能.虽然TC所引起SST降低的空间尺度很小,但其通过大气和海洋的传导会扩大到更大尺度上,由于这种反馈具有一定的滞后性,所以月尺度TC对大尺度环境场影响的信号更为显著.
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| 关 键 词： | 热带气旋 ACE 大尺度环境场 线性回归 |
| 收稿时间： | 2016-04-05 |
Linear regression analysis of the influence of Western North Pacific tropical cyclones on their large-scale environment |
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| SUN Xing-Zhi,ZHONG Zhong,JIANG Jing.Linear regression analysis of the influence of Western North Pacific tropical cyclones on their large-scale environment[J].Chinese Journal of Geophysics,2017,60(3):903-911. |
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| Authors: | SUN Xing-Zhi ZHONG Zhong JIANG Jing |
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| Institution: | 1. College of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China;2. Jiangsu Collaborative Innovation Center for Climate Change, Nanjing University, Nanjing 210023, China |
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| Abstract: | The influence of Western North Pacific (WNP) tropical cyclones (TCs) on their large-scale environment, including 850 hPa relative vorticity, surface zonal wind, total column water vapor, outgoing longwave radiation (OLR), precipitation and sea surface temperature (SST), is investigated by lag regressing of the accumulated cyclone energy (ACE) index on monthly time scale, and the differences with that on weekly time scale is also discussed. The results show that (1) The zonal wind regressed by ACE on monthly time scale is more significant than that on weekly time scale both in intensity and scope. The frequent occurrence of TCs, especially the intense and long-lived near equator TCs, have a positive effect on stimulating or strengthening westerly anomalies to the south of TC activities' region to some extent. The long-lived and intense equatorial surface westerly anomalies can cause westerly wind bursts, and westerly wind bursts are believed to be a major factor during the occurrence and development of ENSO events. (2)On monthly time scale, more variables, such as OLR, precipitation and SST, exhibit El Niño type features than that on weekly time scale, which suggests that TC activities on monthly time scale are closely related to ENSO cycle. (3) After the genesis of TCs for one or two months, the drying and associated OLR increasing in the original region of TC activities can reduce the potential of TCs occurrence. Although the SST reduction by TC is small in spatial scale, it would expand to a large scale through adjustment mechanisms in ocean and atmosphere. In addition, as the feedback is lagged, the signals of TCs on their large-scale environment on monthly time scale are more significant. |
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| Keywords: | TCs ACE Large-scale environment Linear regression |
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