大气科学2009，Vol.33Issue(6)：1286-1296,11.
2007年夏季淮河流域洪涝与亚洲地区大气低频振荡的关系
The Relationship between the Atmospheric Low-Frequency Oscillation over Asia and the Flood in the Huaihe River Valley in the Summer of 2007
摘要
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.关键词
低频振荡/大气热源(热汇)/淮河流域/洪涝Key words
low-frequency oscillation (LFO), atmospheric heating source/sink, the Huaihe River basin, flood分类
天文与地球科学引用本文复制引用
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):1286-1296,11.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 （）
