A34A-07
The Effects of Aerosols on the Summer Precipitation Over the Tibet Plateau
Wednesday, 16 December 2015: 17:30
3008 (Moscone West)
Guoxing Chen, SUNY at Albany, Albany, NY, United States, Jing Yang, Beijing Normal University, State Key Laboratory of Earth Surface Processes and Resource Ecology (ESPRE), Beijing, China, Qing Bao, Institute of Atmospheric Physics, State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Beijing, China; IAP Insititute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China and Wei-Chyung Wang, State Univ of New York, Albany, NY, United States
Abstract:
Recent observational analyses revealed that the summer precipitation over the Tibet Plateau (TP) exhibits two modes (quasi-biweekly and quasi-9 days) of intraseasonal variations (ISVs) dominated by large-scale dynamics. Studies also suggest that increasing anthropogenic aerosol forcing in the East and South Asia can affect the Asia monsoon system. It is therefore likely that the increased aerosol loadings of sulfates and black carbons over TP and its surrounding areas can affect the precipitation over TP in at least two ways—directly by changing the vertical radiative heating/cooling distributions on TP through aerosol-cloud interactions and indirectly by perturbing the dynamics through differential heating/cooling between TP and the neighboring areas. Here, we conduct WRF simulations to investigate the direct and cloud adjustment effects of aerosols on the phase and amplitude of the ISVs. Multiple-component aerosols from data assimilation system are used to drive the aerosol-radiation and aerosol-cloud-radiation interactions. Preliminary results show that the aerosol optical depth is small over TP, but quite large in the surrounding areas. Simulation results of both the local aerosol-cloud-radiation interactions and the responses of aerosol-dynamics coupling will be presented and discussed.
