loading page

Deciphering the Shift from Warm-Dry to Warm-Wet Events in Ice-Covered and Non-Ice-Covered Regions
  • +7
  • Xinlu Chen,
  • Lianlian Xu,
  • Ran Yang,
  • Ming Cai,
  • Yi Deng,
  • Deliang Chen,
  • Song Yang,
  • Jiping Liu,
  • Qinghua Yang,
  • Xiaoming Hu
Xinlu Chen
School of Atmospheric Sciences, Sun Yat-sen University
Author Profile
Lianlian Xu
School of Atmospheric Sciences, Sun Yat-sen University
Author Profile
Ran Yang
School of Atmospheric Sciences, Sun Yat-sen University
Author Profile
Ming Cai
Florida State University
Author Profile
Yi Deng
Georgia Institute of Technology
Author Profile
Deliang Chen
University of Gothenburg
Author Profile
Song Yang
Sun Yat-sen University
Author Profile
Jiping Liu
Sun Yat-sen University, and Southern Marine Science and Engineering Guangdong Laboratory
Author Profile
Qinghua Yang
Sun Yat-sen University
Author Profile
Xiaoming Hu
Sun Yat-sen University

Corresponding Author:[email protected]

Author Profile

Abstract

Compound warm events exert profound impacts on environment, health, and socioeconomics. A recent study indicated a shift or transition from warm-dry events (WDEs), common in non-ice-covered areas, to warm-wet events (WWEs) in ice-covered zones. Utilizing ERA5 reanalysis data, this study determined the duration and frequency of WDEs and WWEs across ice-covered and non-ice-covered regions. A comprehensive analysis uncovers the physical mechanisms responsible for this shift and attributes it to the weakening of land-atmosphere interaction caused by ice-cover, which inhibits soil moisture feedback and reduces the intensity and duration of warm events in ice-covered areas. Both WDEs and WWEs are associated with high-pressure systems (HPs). WDEs, situated directly beneath HPs, intensify due to adiabatic warming from subsidence motions. Conversely, WWEs, located beneath the poleward fringes of HPs, emerge from advective warming and moistening associated with poleward intrusions of warm-moist air.
16 Apr 2024Submitted to ESS Open Archive
16 Apr 2024Published in ESS Open Archive