Plateau Meteorology

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2017 , Vol. 36 >Issue 6: 1595 - 1607

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00129

Analysis of Atmospheric Circulation Characteristics and Mechanism of Heat Wave and Drought in Summer of 2013 over the Middle and Lower Reaches of Yangtze River Basin

  • WANG Wen ,
  • XU Jinping ,
  • CAI Xiaojun ,
  • SUN Chang
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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 Disaster(CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, China;Anji Meteorological Bureau, Anji 313300, Zhejiang, China

Received date: 2016-04-14

  Online published: 2017-12-28

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Abstract

Based on the daily temperature and precipitation data of 90 stations from 1981 to 2013 in the middle and lower reaches of Yangtze River (MLRYR) in China, the NCEP/NCAR daily reanalysis data and monthly NOAA Extended Reconstructed Sea Surface Temperature v4 (ERSSTv4) data, the general characteristics and effect mechanism of the continuous hot-dry weather occurred in MLRYR during the summer of 2013 had been investigated. The results were shown as follows:(1) The rainfall was less 49.43% than the historical average. A drought was started in the middle and last dekad of July and then developed gradually, the most severe drought was happened in the first and middle dekad of August while the whole MLRYR was caught in moderate to severe drought, some local areas of MLRYR were reached special drought with the daily mean temperature on the high side 5℃. (2) Affected by the negative phase of EAP (East Asia Pacific)/PJ (Pacific Japan) teleconnection, WPSH (western Pacific subtropical high) was larger, stronger and the position was westward than normal, controlled MLRYR for a long time, which was one of the most direct reasons for why the heat wave and drought happened. Because of the strong EASM (East Asian summer monsoon) and northward EASWJ (East Asian subtropical westerly jet), the warm-moist and cold-dry air did not match in MLRYR, combined with the descending motion effects, which was not conducive to the formation of precipitation. (3) By the influence of "Silk Road"teleconnection from August 1st to 2nd pentad, Rossby waves originated from the North Atlantic along the westerly jet stream waveguide dispersed to East Asia-Pacific region, enhanced two height anomaly centers at middle and high latitude of the negative phase of EAP/PJ teleconnection, which played an important role in the maintenance and development of its morphology, and prompted the abnormal development of the WPSH to the peak period. (4) The high SST anomaly in the warm pool of the Western Pacific is the main reason for the long-term maintenance of negative EAP/PJ teleconnection. While the anomalous high SST in the North Atlantic Ocean in July is closely related to the westerly jet anomaly, which is an another possible cause for the configuration of the East Asian monsoon system.

Key words： Middle and lower rea; summer drought and h; teleconnection patte; rossby wave action

Cite this article

WANG Wen , XU Jinping , CAI Xiaojun , SUN Chang . Analysis of Atmospheric Circulation Characteristics and Mechanism of Heat Wave and Drought in Summer of 2013 over the Middle and Lower Reaches of Yangtze River Basin[J]. Plateau Meteorology, 2017 , 36(6) : 1595 -1607 . DOI: 10.7522/j.issn.1000-0534.2016.00129

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