| 2007年夏季淮河流域洪涝与亚洲地区大气低频振荡的关系 |
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| 引用本文： | 岑思弦,巩远发,王霄.2007年夏季淮河流域洪涝与亚洲地区大气低频振荡的关系[J].大气科学,2009,33(6):1286-1296. |
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| 作者姓名： | 岑思弦 巩远发 王霄 |
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| 作者单位： | 1.成都信息工程学院高原大气与环境研究中心, 成都,610025;中国气象局成都高原气象研究所,成都,610072 |
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| 基金项目： | 国家重点基础研究发展规划项目2004CB418302;国家自然科学基金基金项目:40633018、40675036 |
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| 摘 要： | 利用NCEP/NCAR再分析资料和我国地面观测站的逐日降水资料, 研究了2007年夏季淮河流域洪涝与亚洲地区大气低频振荡的联系, 通过分析研究表明: 2007年夏季淮河流域降水低频振荡的主要周期是30～70天, 该低频序列的方差大约占了总方差的47%; 在降水低频振荡的位相5～8 (1～4), 亚洲季风区从阿拉伯海北部经孟加拉湾到我国南海地区, 以及我国淮河流域经渤海到日本地区主要受低频热源 (热汇) 的控制; 并且在极大降水位相7, 我国东部地区 (10°N～45°N, 110°E～120°E), 从北到南, 〈Q1〉低频分量的分布呈负正相间的低频热汇、 热源、 热汇、 热源形式(位相3则呈相反的分布形式); 在位相5～8 (1～4), 亚洲季风区〈Q1〉低频分量的分布有利于 (不利于) 气流向淮河流域汇合并形成辐合上升; 受低频环流变化的影响, 在位相5～8, 大量的水汽被输送到淮河流域, 辐合上升形成降水; 相反, 在位相1～4, 来自西太平洋上的水汽在该地区辐散, 不利于降水的发生。
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| 关 键 词： | 低频振荡 大气热源(热汇) 淮河流域 洪涝 |
The Relationship between the Atmospheric Low-Frequency Oscillation over Asia and the Flood in the Huaihe River Valley in the Summer of 2007 |
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| CEN Sixian,GONG Yuanfa and WANG Xiao.The Relationship between the Atmospheric Low-Frequency Oscillation over Asia and the Flood in the Huaihe River Valley in the Summer of 2007[J].Chinese Journal of Atmospheric Sciences,2009,33(6):1286-1296. |
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| Authors: | CEN Sixian GONG Yuanfa and WANG Xiao |
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| Abstract: | Floods and droughts often take place in the Changjiang-Huaihe basin. In the summer of 2007, the severe flood occurred again in the Huaihe River basin. In order to investigate the cause, using the NCEP/NCAR reanalysis data and observed daily rainfall from gauge stations, association of the atmospheric low-frequency oscillation (LFO) over Asia with the severe flood in the Huaihe River basin in the summer of 2007 has been studied in this paper. The result shows that: the low-frequency oscillation of rainfall over the Huaihe River basin in the summer of 2007 was mainly controlled by the 30-70-day oscillation, the variance of this time series can account for about 47% of the to-tal variance, thereby, the rainfall 30-70-day low-frequency oscillation plays an important role in the summer flood of 2007; during the period from phases 5 to 8 (1 to 4) of the rainfall low-frequency oscillation (LFO), the Asia monsoon regions from the northern Arabian Sea to the South China Sea across the Bay of Bengal and from the Hua-ihe River basin in China to Japan were mainly controlled by the heating source (sink) of the (Q_1) LFO; at extreme phase 7, the (Q_1) LFO presents the mode distribution of heating sink, heating source, heating sink and heating source from the north to south over eastern China (10°N-45°N, 110°E-120°E), and it is quite the reverse at ex-treme phase 3; from phases 5 to 8 (1 to 4), the distribution of the (Q_1) LFO over the Asia monsoon region is favor-able (unfavorable) for the air flow convergence over the Huaihe River basin and the resulting ascent in this region; because of the change of the circulation low-frequency oscillation (LFO), during the period from phases 5 to 8, more moisture was transported to the Huaihe River basin, convergence and ascent lead to the strong rainfall in this re-gion; reversely, from phases 1 to 4, the divergence of moisture from the westem Pacific took place in the Huaihe River basin, which makes against the rainfall occurring in this region. |
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| Keywords: | low-frequency oscillation (LFO) atmospheric heating source/sink the Huaihe River basin flood |
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