Topic: Diagnosis and Improvement of Simulation of Diurnal Variation of Precipitation in Climate Models

Time: 13:30, June 19, 2024 (Wednesday)

Venue: S818, Mong Man Wai Technology Building, Tsinghua University

Speaker: Tang Shuaiqi, Associate Professor (Tenure Track) /Zhicheng Young Professor

The School of Atmospheric Sciences, Nanjing University

Introduction to the Lecture:

Accurately simulating the diurnal variation of precipitation represents a persistent challenge in climate models, which is mainly reflected in the premature appearance of precipitation peak and the inability to simulate the nighttime precipitation peak observed in some areas. This study adopts a diagnostic-attribution-improvement framework, leveraging routine observations and value-added products derived from atmospheric field campaigns to evaluate the diurnal precipitation patterns in CMIP6 models. Through a series of single-column model intercomparison experiments, we dissect the physical processes governing diurnal and nocturnal precipitation, thereby identifying the key physical processes that hinder accurate simulation. To address these deficiencies, we introduce a novel convective parameterization scheme tailored to the convection triggering mechanism. By incorporating enhanced dynamical constraints from large-scale forcing and lifting the restriction on convection initiation within the boundary layer, we aim to improve the simulation of both diurnal and nocturnal precipitation. This parameterization scheme has already been implemented in climate models developed by the US Department of Energy and select domestic institutions.

Profile of the Speaker:

Dr. Tang Shuaiqi holds a Bachelor's and Master's degree in Atmospheric Sciences from Peking University. He obtained his Ph.D. from the School of Marine and Atmospheric Sciences at Stony Brook University in 2015 and subsequently served as a Research Scientist at Lawrence Livermore National Laboratory and Pacific Northwest National Laboratory. In March 2024, he joined Nanjing University as an Associate Professor (Tenure Track) in the School of Atmospheric Sciences, where he was also selected into a prestigious national youth talent program. Dr. Tang’s research endeavors encompass atmospheric precipitation, clouds, and aerosols as well as their intricate interplay. He leverages both atmospheric field observations and Earth system models to comprehend, evaluate, and refine the underlying physical processes. He has developed and managed numerous value-added products from atmospheric field campaigns, created an aerosol-cloud diagnostic tool for Earth system models, and organized model intercomparison studies that have illuminated the shortcomings in simulating the diurnal cycle of precipitation. Furthermore, he has devised an innovative convection triggering mechanism to enhance the simulation of diurnal precipitation patterns. Dr. Tang has authored over a dozen peer-reviewed publications in leading atmospheric science journals as the primary contributor.

Tencent Meeting: 809-639-408