期刊
JOURNAL OF OCEANOLOGY AND LIMNOLOGY
卷 41, 期 2, 页码 409-417出版社
SCIENCE PRESS
DOI: 10.1007/s00343-022-1433-6
关键词
intraseasonal variability; South China Sea; Community Earth System Model Version 2 (CESM2); sea surface temperature
In this study, the impact of sea surface temperature (SST) variability on the pre-monsoonal intraseasonal oscillation (ISO) over the South China Sea was investigated using the CESM2 model. Comparison of observations and model simulations revealed the significant role of air-sea coupling in reproducing realistic ISOs. The time lag between SST warming and peak convection highlights the importance of considering this phase relationship in atmospheric modeling.
The role of sea surface temperature (SST) variability in the pre-monsoonal (April to July) intraseasonal oscillation (ISO) over the South China Sea (SCS) is investigated using the Community Earth System Model Version 2 (CESM2). An Atmospheric Model Intercomparison Project (AMIP) simulation forced by daily sea surface temperatures (SSTs) derived from a parallel coupled general circulation model (CGCM) run was compared with observations and the mother coupled simulation. In the coupled model, the SST warming leads the peak convection about 1/4 period as in observations. The paralell uncoupled model fails to simulate this phase relationship, implying the importance of air-sea coupling in reproducing realistic ISO. Due to the near-quadrature phase relationship between SST and precipitation ISOs during the ISO events, it is difficult to distinguish the active/passive role of SST from observations alone. Significant correlation in intraseasonal precipitation between the daily SST-forced AMIP and mother CGCM runs indicates that SST plays a role in driving the atmospheric ISO.
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