论文

华南前汛期降水异常年水汽输送特征分析

  • 李莹 ,
  • 原文杰 ,
  • 徐倩倩 ,
  • 胡润杰 ,
  • 李军利 ,
  • 梅雪英 ,
  • 李侠丽
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  • 安徽农业大学资源与环境学院, 合肥 230036;平顺气象局, 长治 047400;合肥市气象局, 合肥 230041;寿县气象局, 寿县 232200

收稿日期: 2015-10-12

  网络出版日期: 2017-04-28

基金资助

国家自然科学基金项目(41571400);安徽省自然科学基金项目(1608085MD85);广东省专项基金项目(粤环200965,粤财工2010620);安徽农业大学人才基金项目(yj2014-24)

Water Vapor Transportation Characteristics in Pre-rainy Season Precipitation anomaly of South China

  • LI Ying ,
  • YUAN Wenjie ,
  • XU Qianqian ,
  • HU Runjie ,
  • LI Junli ,
  • MEI Xueying ,
  • LI Xiali
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  • School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China;Pingshun Meteorological Bureau, Changzhi 047400, China;Hefei Meteorological Bureau, Hefei 230041, China;Shouxian Meteorological Bureau, Shouxian 232200, China

Received date: 2015-10-12

  Online published: 2017-04-28

摘要

基于华南地区76个站点的逐日降水资料及NCEP再分析资料,采用拉格朗日方法的气流轨迹模式(HYSPLIT_4),分析了1980—2011年华南前汛期锋面降水和季风降水的水汽输送轨迹、主要源地及不同源地水汽贡献率。结果表明:锋面降水阶段气流轨迹主要有来自西北太平洋的东风气流、阿拉伯海-孟加拉湾的西风气流和欧亚大陆的西北冷空气。在锋面降水偏多年,西北太平洋的东风气流水汽输送贡献为69%,比偏少年多14%,阿拉伯海-孟加拉湾的西风气流输送贡献为20%,比偏少年少10%,此阶段受来自西北太平洋的水汽影响较大。季风降水阶段气流轨迹主要有来自北印度洋的越赤道气流、西北太平洋的东风气流和欧亚大陆的西北冷空气,在季风降水偏多年,来自北印度洋的越赤道水汽输送贡献为88%,比偏少年多18%,而西北太平洋的水汽输送贡献为7%,比偏少年少15%,此阶段受西南越赤道气流的水汽输送影响较大。

本文引用格式

李莹 , 原文杰 , 徐倩倩 , 胡润杰 , 李军利 , 梅雪英 , 李侠丽 . 华南前汛期降水异常年水汽输送特征分析[J]. 高原气象, 2017 , 36(2) : 501 -509 . DOI: 10.7522/j.issn.1000-0534.2016.00031

Abstract

Based on NCEP reanalysis data and daily precipitation data of 76 meteorological stations in South China from 1980 to 2011, using Lagrangian trajectory model (HYSPLIT_4), the water vapor transportation path, main sources and its contribution in frontal rainfall and monsoon rainfall anomalies during pre-rainy season in South China were studied. Results showed that: In frontal rainfall phase, water vapor path was mainly from Western Pacific, Arabia sea-Bay of Bengal and Continental Eurasian. In wet years of frontal rainfall, water vapor from the Western Pacific accounted for more than 69%, and the water vapor was 14% higher than that in dry years. While the contribution of water vapor from Arabia seaBay of Bengal was 20%, and the water vapor was 10% less than that in dry years. This stage was greatly influenced by the water vapor from the Pacific Northwest. In Monsoon rainfall phrase, water vapor was mainly from the cross-equatorial flow from north Indian Ocean, the Pacific Northwest wind airflow and the northwest cold air in Eurasia. In wet monsoon rainfall years, the water vapor from India ocean had the largest contribution 88%, the moisture from Indian ocean was 18% higher than that in dry years, while the moisture from the Western Pacific was 7%, the moisture from the Western Pacific was 15% less than that in dry years. This stage was greatly influenced by southwest cross-equatorial flow of water vapor transmission.

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