| 淮河洪涝年7月上旬环流特征与近10年平均环流特征差异分析 |
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| 引用本文： | 王东勇,张娇,朱红芳,郑媛媛.淮河洪涝年7月上旬环流特征与近10年平均环流特征差异分析[J].气象,2008,34(8):63-69. |
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| 作者姓名： | 王东勇 张娇 朱红芳 郑媛媛 |
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| 作者单位： | 安徽省气象台,合肥,230031 |
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| 摘 要： | 利用NCEP 1998-2007年分析资料,分析了2007年、2005年和2003年3个淮河大洪水年7月上旬逐日各层的位势高度、温度、水汽和风场等资料.分析结果表明:这3个洪水年和近10年平均场的大尺度环流背景、高低空急流、水汽输送特征等存在显著差异.东亚夏季风异常是这3年淮河流域洪涝出现的主要原因.同时,这3年西北太平洋副热带高压均较历史同期偏强,西伸脊点偏西;华北南部到黄淮距平风场上有较常年明显的偏北气流,副热带高压西北侧850hPa低空急流较常年平均偏强6m·s-1以上,南北两支气流交汇区正好位于淮河流域;在200hPa上淮河流域处于异常的高空急流入口南侧或受较常年偏强的反气旋环流控制之下;从整层水汽通量距平分析,南海是这3个淮河洪涝年的主要水汽源地.
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| 关 键 词： | 洪涝 环流特征 副热带高压 水汽输送 |
| 收稿时间： | 2007/11/12 0:00:00 |
| 修稿时间： | 2008/6/16 0:00:00 |
Circulation Characteristics over Huaihe River Basin During the First 10 Days in July Between Recent Flooding Years and Average of Last 10 Years |
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| Wang Dongyong,Zhang Jiao,Zhu Hongfang and Zheng Yuanyuan.Circulation Characteristics over Huaihe River Basin During the First 10 Days in July Between Recent Flooding Years and Average of Last 10 Years[J].Meteorological Monthly,2008,34(8):63-69. |
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| Authors: | Wang Dongyong Zhang Jiao Zhu Hongfang and Zheng Yuanyuan |
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| Institution: | Anhui Meteorology Observatory, Hefei 230031;Anhui Meteorology Observatory, Hefei 230031;Anhui Meteorology Observatory, Hefei 230031;Anhui Meteorology Observatory, Hefei 230031 |
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| Abstract: | By using the NCEP data of the first 10 days in July from 1998 to 2007, three hea
vy flooding cases in 2003, 2005 and 2007 are analyzed and compared. It is foun
d that there is an obvious difference in the atmospheric circulation background
, the high/low level jets and the water vapor transportation between the floodin
g years and average of ten years. The abnormal feature of the East Asian summer
monsoon is the main reason of the floods. During the first 10 days in July of t
he three flooding years, the west pacific subtropical high is stronger and its
west ridge point is more western than the ten year average. There is obviously
north wind from the south of northChina to the Huanghe and Huaihe basin. The low jets of 850hP
a surpassed 6m/s larger than the ten year mean. The connection of the north and
the south strong air current exactly lied in Huaihe River basin. At 200hPa, Hua
ihe River basin was under the south of the jets entrance or under the anticyclon
e. Through the analysis of abnormal water vapor transportation on the whole laye
r, it is found that the South China Sea was the main water vapor source area. |
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| Keywords: | rainy season of Huaihe river basin atmospheric circulation characteristic west pacific subtropical high water vapor transportation |
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