| 河南夏季高温日数的时空分布特征及500hPa环流型 |
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| 引用本文： | 常军,李素萍,王纪军,余卫东,葛强生.河南夏季高温日数的时空分布特征及500hPa环流型[J].河南气象,2007(2). |
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| 作者姓名： | 常军 李素萍 王纪军 余卫东 葛强生 |
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| 作者单位： | 河南省气候中心 郑州450003(常军，王纪军)，河南省专业气象台 郑州450003(李素萍)，商丘市气象局 河南商丘476000(余卫东，葛强生) |
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| 基金项目： | 河南省科技厅项目“河南省高影响事件变化规律及科学预防措施研究”(0624460004)资助 |
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| 摘 要： | 对河南省40个代表站1961-2005年夏季≥35℃高温日数进行经验正交函数(EOF)展开分析,结果显示,前3个典型场基本能反映河南夏季高温日数分布的主要特征,前3个模态的累积方差贡献率达85%。据此,得出河南夏季≥35℃高温日数的时空分布类型为全省一致型、西北至东南差异型和西南至东北差异型。第一模态对应的时间系数序列的变化幅度最大,第二模态对应的时间系数序列的变化幅度比前一个时间序列要小。第一模态的时间系数演变显示,河南夏季高温日数平均呈减少趋势,且存在2~4 a、8~14 a的周期变化,目前河南夏季高温日数正处于偏多状态中。应用逐日20时500 hPa ECMWF北半球格点资料,对1991-2005年河南典型的大面积持续高温下的环流形势进行普查、分类,分别求各种类型下的环流平均场,从而得到河南省高温的两种环流型,即贝加尔湖高压型和副热带高压型。
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| 关 键 词： | 经验正交函数 贝加尔湖高压 副热带高压 |
Temporal and spatial Characteristic and Circulation Conceptual Models at 500 hPa of High Temperature Days in Henan Summer |
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| Chang Jun,Li Suping,Wang Jijun,Yu Weidong,Ge Qiangsheng.Temporal and spatial Characteristic and Circulation Conceptual Models at 500 hPa of High Temperature Days in Henan Summer[J].Meteorology Journal of Henan,2007(2). |
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| Authors: | Chang Jun Li Suping Wang Jijun Yu Weidong Ge Qiangsheng |
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| Institution: | Chang Jun1,Li Suping2,Wang Jijun1,Yu Weidong3,Ge Qiangsheng3 |
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| Abstract: | Provided with high temperature days in 40 stations in Henan from 1961 to 2005,the cumulated variance contribution ratio and spatial distribution were analyzed.The results showed that the contribution ratio of the first 3 modes was 85%;and the spatial distributions were consistent in Henan province,and variance in NW-SE and SW-NE.The time series of 1st mode showed the high temperature days in Henan summer had a decline tendency,and had periods of 24 years and 814 years.The high temperature days of Henan is in uptrend in recent years.Using the daily grid data in Northern hemisphere at 20:00 500 hPa from ECMWF,the circulation of the large area persistence high temperature was generally examined.The two synoptic conceptual models of Henan summer high temperature were constructed,which were the Baikal high mode and subtropical high mode. |
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| Keywords: | empirical orthogonal function(EOF) Baikal high subtropical high |
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