Recent trends in summer heat waves (HW) over Central-Eastern China and their atmospheric drivers are investigated using the ERA Interim re-analysis. A composite analysis shows that these events are preceded by an increase in 500 hPa geopotential height. Consequently, a subsidence anomaly develops over the region and surface solar radiation increases. An increase in the northward moisture transport from the tropical region is also found to increase specific humidity, leading to warmer night-time temperatures. Feedback effects are also important: decrease of precipitation and enhanced evaporation also increases the specific humidity and North-Westerlies due to the low pressure lead to more heat convergence. HW occurrence increases, especially during the last decade, and is largely due to an increase in the mean temperature rather than to a change in dynamics, suggesting a human influence.
School of Geosciences, University of Edinburgh, Edinburgh, United Kingdom;Author to whom any correspondence should be addressed.;School of Geosciences, University of Edinburgh, Edinburgh, United Kingdom;Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, People’s Republic of China;School of Geosciences, University of Edinburgh, Edinburgh, United Kingdom
Recommended Citation:
Nicolas Freychet,Simon Tett,Jun Wang,et al. Summer heat waves over Eastern China: dynamical processes and trend attribution[J]. Environmental Research Letters,2017-01-01,12(2)