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- A33K-2311: Simulations of Convectively Coupled Kelvin Waves (CCKWs) With Three Different Cumulus Parameterization Schemes
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Board 2311‚ Hall EFG (Poster Hall)NOLA CC
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Sehyun Lee, Yonsei University (First Author, Presenting Author)
Sang-Hun Park, Yonsei University
Mu-Ting Chien, University of Washington
Daehyun Kim, Seoul National University
Convectively coupled Kelvin waves (CCKWs) are bands of storms and rainfall that travel eastward along the equator, strongly influencing tropical weather and climate. However, capturing these waves accurately in weather and climate models is still difficult. One important reason is how models simulate convection—the process where warm air rises to form clouds and precipitation. This study investigated how various ways of representing convection in models, known as cumulus parameterization schemes, affect the simulation of CCKWs. Using the Weather Research and Forecasting (WRF) model, we compared three different cumulus schemes: Grell-Freitas (GF), multi-scale Kain-Fritsch (MSKF), and New Tiedtke (NTDK). Our findings indicate that the NTDK scheme generates the most pronounced CCKW signals, while the GF and MSKF schemes produce weaker patterns. To explain these differences, we analyzed how each scheme represents heating and temperature at different altitudes. We found that the NTDK scheme provides favorable conditions for enhancing CCKWs because it better represents the vertical structures of heating and temperature changes. Improving the way convection is modeled can lead to more accurate representations of these important tropical waves, ultimately resulting in better weather forecasts and a deeper understanding of tropical climate behavior.
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