高原气象

高原气象 >

2019 , Vol. 38 >Issue 2: 237 - 252

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00079

论文

青藏高原地表非绝热加热模态及其与中国北方环流异常的联系

  • 于涵 ,
  • 张杰 ,
  • 刘诗梦
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  • 气象灾害预报预警与评估协同创新中心/气象灾害省部共建教育部重点实验室, 南京信息工程大学, 江苏 南京 210044;辽阳市气象局, 辽宁 辽阳 111000;内蒙古自治区气候中心, 内蒙古 呼和浩特 010000

收稿日期: 2018-07-06

  网络出版日期: 2019-04-28

基金资助

国家科技重大专项（2016YFA0600702）；国家自然科学基金项目（41630426，91437107）

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Surface Diabatic Heating Mode of the Qinghai-Tibetan Plateau and Its Relationship with the Anomalous Circulation in Northern China

  • YU Han ,
  • ZHANG Jie ,
  • LIU Shimeng
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  • Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China;Liaoyang Meterological Bureau, Liaoyang 111000, Liaoning, China;Climate center of Inner Mongolia autonomous region, Hohhot 010000, Inner Mongolia, China

Received date: 2018-07-06

  Online published: 2019-04-28

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摘要

利用青藏高原非均匀下垫面热力输送系数及地表有效辐射的EOF分析结果，计算了2000年以来的高原地表非绝热加热资料，并将1958-2013年地表非绝热加热资料进行重建得到高原地表非绝热加热指数，以表征高原不同气候分区的地表热力状况。根据EOF分析结果将高原分为4个气候区，并从波能传播的角度分析其对中国北方环流异常的影响。结果表明，高原地表非绝热加热指数在西部边缘（气候Ⅰ区），除了冬季为微弱下降趋势以外，其他季节都为微弱的上升趋势；在高原中西部腹地（气候Ⅱ区），四季均为下降趋势；在高原东北部（气候Ⅲ区），除了冬季表现为微弱的下降趋势外，其他季节均为微弱的上升趋势；而在高原东南部（气候Ⅳ区），四季均表现为下降趋势。高原西部边缘地表非绝热加热异常增强时，高原200 hPa上空为波能辐散区，并向东传播，初夏在北方辐合加强，有利于降水，干旱减弱；盛夏在北方地区处于辐散区，加剧干旱。在高原东北部地表非绝热加热异常增强时，该区200 hPa上空为波能辐散区，并向东传播，无论是在初夏还是盛夏，除了东北地区北部，北方其他地区辐合加强，有助于干旱减弱。

关键词： 青藏高原; 地表非绝热加热指数; 北方环流异常; 波列

本文引用格式

于涵 , 张杰 , 刘诗梦 . 青藏高原地表非绝热加热模态及其与中国北方环流异常的联系[J]. 高原气象, 2019 , 38(2) : 237 -252 . DOI: 10.7522/j.issn.1000-0534.2018.00079

Abstract

Based on the estimation of the surface heat transfer coefficient and the effective surface radiation under the EOF analysis of the Qinghai-Tibetan Plateau (QTP), the surface diabatic heating data of the QTP were calculated since 2000, and the diabatic heating data from 1958 to 2013 were reconstructed. The surface diabatic heating index of the QTP was obtained, which is used to indicate the surface thermal conditions for different climatic regions of QTP. According to the results of EOF, the QTP was divided into four climatic regions. The effects of QTP on the circulation anomalies in the northern China from the perspective of the propagation of wave energy were analyzed. The following conclusions were obtained:the surface diabatic heating index in the western edge of QTP (regionⅠ)has a weak increasing trend, except for winter with a slight decline trend. The surface diabatic heating index in the mid-west hinterland of QTP (regionⅡ) is decreasing in all seasons. The surface diabatic heating index in the northeast of the QTP (region Ⅲ) has a weak increasing trend, except for winter with a slight decline trend. However, the surface diabatic heating index in the southeast of QTP (region Ⅳ) shows a declining tendency in all seasons. The high altitude is a wave energy divergence area of QTP at 200 hPa, when the surface diabatic heating index with abnormal increasing in the western edge of QTP. The enhancement of wave energy convergence of northern China in early summer benefits to the precipitation, which weakened drought. However, the wave energy divergence in northern China in midsummer, which makes more drought. When the surface diabatic heating index anomalies increase in the northeast of QTP, there is an energy divergence area at high altitude as well. Whether in early summer or midsummer, convergence in northern China will contribute to weakening the drought. However, divergence will appear in the northeast of China and drought will be intensified. These conclusions provides a reference for the understanding of the spatial and temporal distribution of surface diabatic heating of QTP, which effects on the anomalous circulation in northern China.

Key words： Qinghai-Tibetan Plat; surface diabatic hea; anomalous circulatio; wave train

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