| 青藏高原4月感热通量异常对长江以南夏季降水的影响 |
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| 引用本文： | 张超,田荣湘,茆慧玲,申紫薇.青藏高原4月感热通量异常对长江以南夏季降水的影响[J].大气科学学报,2018,41(6):775-785. |
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| 作者姓名： | 张超 田荣湘 茆慧玲 申紫薇 |
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| 作者单位： | 浙江大学 地球科学学院气象信息与预测研究所, 浙江 杭州 310027;复旦大学 大气科学研究院, 上海 200438,浙江大学 地球科学学院气象信息与预测研究所, 浙江 杭州 310027,浙江大学 物理学系光学研究所, 浙江 杭州 310027,浙江大学 地球科学学院气象信息与预测研究所, 浙江 杭州 310027 |
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| 基金项目： | 国家自然科学基金资助项目（91337212） |
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| 摘 要： | 基于1980—2015年青藏高原、长江以南地区的站点资料,利用EOF、小波分析等方法,分析了青藏高原及各分区4月的感热通量和长江以南地区夏季降水特征,以及它们之间的相关性。结果表明:喜马拉雅地区(关键区) 4月感热通量可以作为长江以南地区夏季降水的预报因子之一;青藏高原4月感热通量和长江以南地区夏季降水均存在4 a主周期和8 a副周期,在1998年、2011年前后出现转折;高原整体、E区、G区4月感热通量均与长江以南地区夏季降水呈负相关;高原关键区4月感热通量偏弱时,长江以南地区高空(850 hPa)处于深槽槽前,西部配合有切变线系统,斜压性很强,空气相对湿度很大,利于长江以南地区降水,反之亦然。
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| 关 键 词： | 青藏高原 感热通量 预报因子 长江以南地区 |
| 收稿时间： | 2017/1/24 0:00:00 |
| 修稿时间： | 2017/5/17 0:00:00 |
Impact of the sensible heat flux anomaly over the Tibetan Plateau in April on summer precipitation in the south of the Yangtze River Region |
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| ZHANG Chao,TIAN Rongxiang,MAO Huiling and SHEN Ziwei.Impact of the sensible heat flux anomaly over the Tibetan Plateau in April on summer precipitation in the south of the Yangtze River Region[J].大气科学学报,2018,41(6):775-785. |
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| Authors: | ZHANG Chao TIAN Rongxiang MAO Huiling and SHEN Ziwei |
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| Institution: | Meteorological Information and Forecasting Institute, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China;Institute of Atmospheric Sciences, Fudan University, Shanghai 200438, China,Meteorological Information and Forecasting Institute, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China,Institute of Optics, Department of Physics, Zhejiang University, Hangzhou 310027, China and Meteorological Information and Forecasting Institute, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | In this study,based on site data for the Tibetan Plateau(TP) and the south of the Yangtze River Region during the period of 1980-2015,and by utilizing EOF,wavelet analysis and other statistical methods,the sensible heat fluxes over the TP and its subareas in April were calculated and analyzed.In addition,the precipitation in the south of the Yangtze River Region was also analyzed,and its correlations with sensible heat flux were determined.It was observed that sensible heat flux over the Himalayan Region,the sensible heat flux over the crucial district which can be defined as Tibet Plateau sensible heat index(TPSHI),can be treated as a precursor for the summer precipitation in the south of the Yangtze River Region.The exception is that sensible heat flux over the TP in April and summer precipitation in the south of the Yangtze River Region shows the same 4a primary period and 8a secondary period,with the turning point being around 1998 and 2011.Favorable negative correlations exist between the sensible heat over the TP,area E,area G in April and precipitation in the south of the Yangtze River Region in summer,especially in area E,due to the negative correlation of sensible heat over the TP and areas E and G in April related to precipitation in the south of the Yangtze River Region in summer.This signifies that when the sensible heat flux is weaker in April,the south of the Yangtze River Region will undergo drastic precipitation in summer.However,when the sensible heat flux is strong,the opposite will be true.When the sensible heat flux over the critical area is weak,the south of the Yangtze River Region is in front of the deep trough(850 hPa).With the shear line system,the baroclinicity is very strong and the relative humidity is very high,which jointly contribute to the precipitation.If the opposite is true,it will not be conducive to precipitation. |
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| Keywords: | TP sensible heat flux predictor south of the Yangtze River |
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