| 1990年代末东亚北部地区夏季水汽输送年代际变化特征及其影响机制 |
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| 引用本文： | 胡泊,张志森,乔少博,龚志强.1990年代末东亚北部地区夏季水汽输送年代际变化特征及其影响机制[J].大气科学,2016,40(5):933-945. |
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| 作者姓名： | 胡泊 张志森 乔少博 龚志强 |
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| 作者单位： | 1.扬州大学物理科学与技术学院, 扬州 225002 |
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| 基金项目： | 国家自然科学基金项目41575082、41205040、41375078，公益性行业专项GYHY201306021，国家重大基础研究计划项目2012CB955902 |
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| 摘 要： | 利用1983～2011年降水量、环流和海温的再分析资料，探讨了东亚北部地区夏季水汽输送的年代际变化特征，并分析了前冬北大西洋海温对东亚北部地区夏季水汽输送与大气环流的可能影响。研究结果表明，20世纪90年代末期东亚北部地区夏季整层水汽与降水年代际的变化特征相一致，整层水汽通量的年代际变化主要是由于纬向水汽输送异常作用的结果。东亚北部地区（35°～55°N，90°～145°E）西边界的水汽输送通量由多变少，东边界的水汽输送通量由少变多特征则直接导致了该地区降水由偏多转为偏少的年代际变化。就外强迫海温角度来说，前冬北大西洋海温跟东亚北部地区夏季500 hPa高度场、850 hPa风场和850 hPa比湿均显著相关。同时，在20世纪90年代中后期前冬北大西洋海温也表现出由偏低向偏高转变的年代际变化特征，且由于海温自身的记忆性前冬的海温异常一直延续到夏季。并在夏季激发出横跨北大西洋和欧亚大陆中高纬度地区的大西洋-欧亚（AEA）遥相关结构，并进一步影响东亚北部地区夏季水汽输送。
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| 关 键 词： | 水汽输送 年代际变化 环流 外强迫 |
| 收稿时间： | 2015/3/16 0:00:00 |
The Interdecadal Variation and Physical Mechanism for the Summertime Water Vapor Transport in Northern East Asia in the Late 1990s |
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| HU Po,ZHANG Zhisen,QIAO Shaobo and GONG Zhiqiang.The Interdecadal Variation and Physical Mechanism for the Summertime Water Vapor Transport in Northern East Asia in the Late 1990s[J].Chinese Journal of Atmospheric Sciences,2016,40(5):933-945. |
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| Authors: | HU Po ZHANG Zhisen QIAO Shaobo and GONG Zhiqiang |
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| Institution: | 1.College of Physical Science and Technology, Yangzhou University, Yangzhou 2250022.College of Atmospheric Sciences, Lanzhou University, Lanzhou 7300003.Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081 |
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| Abstract: | Time water vapor transport over the northern East Asia have been analyzed using various datasets of precipitation, atmospheric circulation and sea surface temperature (SST) for the period of 1983 to 2011. The influence of preceding winter North Atlantic SST on the summertime water vapor transport and atmospheric circulation in northern East Asia are investigated. Results show that the decadal variability of summertime integrated water vapor transport, which is caused by changes in zonal water vapor, is similar to that of precipitation over northern East Asia in the late 1990s. Moreover, the decadal change is more significant along the western boundary than in the eastern boundary of the study region. A significant correlation is found between preceding winter North Atlantic SST and 500 hPa geopotential height, 850 hPa wind and specific humidity in the summer. In the late 1990, SST changes from anomalously cool to anomalously warm in the winter and the warm SST anomaly persists into the following summer. The summer North Atlantic SST anomaly generates an Atlantic-Eurasia (AEA) teleconnection structure that is across the North Atlantic and the middle-high latitude of Eurasia during the corresponding period, and further influences the summertime water vapor transport over northern East Asia. |
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| Keywords: | Water vapor transport Inter-decadal variation Circulation Extra-forcing factor |
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