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Journal of Meteorological Research

, Volume 33, Issue 3, pp 478–490 | Cite as

Intraseasonal Variations of Summer Convection over the Tibetan Plateau Revealed by Geostationary Satellite FY-2E in 2010–14

  • Bo Li
  • Liu Yang
  • Shihao TangEmail author
Special Collection on the Third Tibetan Plateau Atmospheric Science Experiment (TIPEX-III)
  • 122 Downloads

Abstract

Based on the infrared black body temperature (TBB) observed by the geostationary meteorological satellite FY-2E from 2010 to 2014, the seasonal migration, occurrence frequency, and intraseasonal variability of summer convection over the Tibetan Plateau (TP) and its surrounding areas are analyzed. The results show that in May, convection mainly occurs over the eastern edge of the TP; in June, following the onset of the Asian summer monsoon, the strongest (severe) convection occurs in the southeastern part of the TP; and in July–August, strong southwesterly winds transport abundant moisture to the eastern and central areas of the TP, leading to formation of an active convection belt over southeastern TP. The results also show that in the western TP, the area with convection frequency greater than 6% occupies the southern plateau around the 37th pentad, and gradually moves northward until the end of July; in the central plateau, convection (severe convection) becomes active since early (mid) June, and maintains through the entire late summer with three major northward movements until reaching 34°N; and in the eastern TP, the convection is relatively active since the beginning of May and its northward stretching is slightly later than that over the central plateau. Overall, summer convective activities are unevenly distributed over the TP, with frequency of convection decreasing from south to north; and they also exhibit considerable intraseasonal variability, the maximum of which is found over the middle reach of the Yarlung Zangbo River and the southeastern plateau. EOF analysis of summer convection frequency over the TP reveals two leading modes, with the first mode being a dipole variation pattern between the Indian monsoon region and the southeastern TP, and the second mode a tripole pattern over the western TP, the Indian continent west of 80°E, and the South Asian continent east of 80°E.

Key words

Tibetan Plateau black body temperature (TBB) severe convection intraseasonal variation 

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Notes

Acknowledgments

We acknowledge Professor Ping Zhao of the Chinese Academy of Meteorological Sciences for his many valuable suggestions on this work.

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Copyright information

© The Chinese Meteorological Society and Springer-Verlag Berlin Heidelberg 2019

Authors and Affiliations

  1. 1.National Satellite Meteorological CenterChina Meteorological AdministrationBeijingChina
  2. 2.Key Laboratory of Radiometric Calibration and Validation for Environmental SatellitesChina Meteorological AdministrationBeijingChina
  3. 3.Meteorological Office of Longquanyi District of ChengduSichuan Province, ChengduChina

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