高原气象

高原气象 >

2019 , Vol. 38 >Issue 1: 14 - 28

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00064

论文

青藏高原南侧经圈环流变化特征及其对降水影响分析

  • 胡梦玲 ,
  • 游庆龙
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  • 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心, 江苏 南京 210044;南京市江宁区气象局, 江苏 南京 211100

收稿日期: 2018-02-12

  网络出版日期: 2019-02-28

基金资助

国家重点研发计划项目（2016YFA0601702）；国家自然科学基金项目（41771069）；江苏高校优势学科建设工程资助项目（PAPD）

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Characteristics of Meridional Circulation Cell on the South Side of Qinghai-Tibetan Plateau and its Effects on Precipitation over the region

  • HU Mengling ,
  • YOU Qinglong
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  • Key Laboratory of Meteorological Disaster, Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD), Nanjing University of Information Science and Technology(NUIST), Nanjing 210044, Jiangsu, China;Nanjing Jiangning Meteorological Bureau, Nanjing Jiangning 211100, Jiangsu, China

Received date: 2018-02-12

  Online published: 2019-02-28

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摘要

基于1979-2015年青藏高原（下称高原）地区气象观测站的逐日降水资料和ERA-Interim逐日再分析资料，分析高原南侧经圈环流的季节演变及年际变化特征，并讨论其对高原降水及水汽输送的影响。结果表明，高原南侧80°E-90°E范围存在前季风环流、季风环流、Hadley环流的季节演变，前季风环流有-0.377 s-1·（10a）-1减弱的趋势，季风环流有0.524 m·s-1·（10a）-1显著增强趋势。在90°E-105°E范围存在季风环流和Hadley环流季节转换，季风环流存在0.413 m·s-1·（10a）-1的增强趋势。基于各经圈环流开始、结束时间的定义，发现在80°E-90°E，前季风环流建立的时间有推迟而结束时间有提前的现象，其维持时间出现每10年-1.47候的缩短趋势。在90°E-105°E，季风环流维持时间增长，Hadley环流维持时间缩短。前季风环流增强使得高原水汽辐散区辐散增强，水汽辐合区辐合增强，高原西南侧有东北向水汽输送增强，而高原西北侧有西南向水汽输送增强。夏季季风环流增强，高原南部至孟加拉湾地区自南向北的经向水汽输送显著增强，印度洋向高原输送的西南向水汽通量明显增加。前季风环流增强，春季高原中部及西南部降水减少，而东南部和北部降水增加。夏季季风环流增强时，高原南侧上升支增强，高原南部降水增加，而高原北部降水出现减少。

关键词： 青藏高原; 经圈环流; 变化特征; 高原降水; 水汽输送

本文引用格式

胡梦玲 , 游庆龙 . 青藏高原南侧经圈环流变化特征及其对降水影响分析[J]. 高原气象, 2019 , 38(1) : 14 -28 . DOI: 10.7522/j.issn.1000-0534.2018.00064

Abstract

Based on the daily observational precipitation data and ERA-Interim daily reanalysis data from 1979 to 2015, the meridional circulation cell characteristics on the south side of Qinghai-Tibetan Plateau and its effects on precipitation and water vapor transport over the Qinghai-Tibetan Plateau had been investigated. The results are shown as follows:The pre-monsoon circulation, monsoon circulation and Hadley circulation constitute seasonal evolution of meridional circulation cell on the south side of Qinghai-Tibetan Plateau along 80°E-90°E. A decreasing trend is observed with a rate of -0.377 s-1·(10a)-1 in the intensity of pre-monsoon circulation, while an increasing trend is detected with a value of 0.524 m·s-1·(10a)-1 in the intensity of monsoon circulation. There exists the transition of monsoon circulation and Hadley circulation on the south side of Qinghai-Tibetan Plateau along 90°E-105°E. The intensity of monsoon circulation remarkably increases during 1979-2015 with a trend of 0.413 m·s-1· (10a)-1. According to the definition of building and ending time of each meridional circulation cell, the setup of pre-monsoon circulation is delayed and the ending time is advanced and hence the maintaining time of pre-monsoon circulation trends to be shortened. Along the 90°E-105°E, the maintaining time of monsoon circulation shows an increasing trend while the maintaining time of Hadley circulation presents a decreasing trend. When the pre-monsoon circulation becomes stronger, the water vapor in divergence region trends to divergent and the water vapor in convergence region trends to convergent. Moreover, north-east water vapor transport is increased on the southwest Tibetan Plateau and south-west water vapor transport is enhanced on the northwest Qinghai-Tibetan Plateau. The strong summer monsoon circulation is beneficial to northward water vapor transport in the southern Tibetan Plateau and the Bay of Bengal and south-west water vapor transport from the Indian Ocean to the Tibetan Plateau. The precipitation is decreased in the middle and southwest Qinghai-Tibetan Plateau, whereas increases in the southeast and north of the Qinghai-Tibetan Plateau are clear as pre-monsoon circulation is enhanced. When summer monsoon circulation is strengthened, the more/less rainfall occurs in the south/north of Qinghai-Tibetan Plateau.

Key words： Qinghai-Tibetan Plat; meridional circulati; variation characteri; precipitation over t; water vapor transpor

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