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Influence of a spectral cumulus parametrization on simulating global tropical cyclone activity in an AGCM
Quarterly Journal of the Royal Meteorological Society ( IF 3.0 ) Pub Date : 2020-12-21 , DOI: 10.1002/qj.3965 Yuya Baba 1
Quarterly Journal of the Royal Meteorological Society ( IF 3.0 ) Pub Date : 2020-12-21 , DOI: 10.1002/qj.3965 Yuya Baba 1
Affiliation
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The influence of a new spectral cumulus parametrization (the spectral scheme) on simulating global tropical cyclone (TC) activity in an Atmospheric General Circulation Model (AGCM) is investigated. Experiments are performed using AFES (AGCM for the Earth Simulator) and two different convection schemes – the original convection scheme of the AGCM (the Emanuel scheme) and the spectral scheme. The result shows that the both schemes can capture qualitative features of global TC activity in terms of climatology, variability, and intensity. However, the spectral scheme simulates TC genesis and track density better than the original convection scheme by improving the cold bias in the upper troposphere. The spectral scheme also provides better results for TC response to interannual variability (i.e., El Niño Southern Oscillation, ENSO) by suppressing excessive convection response to ENSO. The spectral scheme is capable of simulating the variability of TC genesis related to the Madden–Julian Oscillation (MJO) much better than the original convection scheme. Consequently, the spectral scheme can outperform the original convection scheme in simulating global TC activity from various perspectives, and thus the scheme is expected to be useful for TC prediction and future projections.
中文翻译：
光谱积云参数化对模拟AGCM中全球热带气旋活动的影响
研究了一种新的光谱积云参数化（光谱方案）对模拟大气环流模型（AGCM）中的全球热带气旋（TC）活动的影响。使用AFES（地球模拟器的AGCM）和两种不同的对流方案（AGCM的原始对流方案（伊曼纽尔方案）和光谱方案）进行了实验。结果表明，这两种方案都可以从气候，变异性和强度方面捕获全球TC活动的定性特征。但是，通过改善对流层上方的冷偏光，该频谱方案比原始对流方案更好地模拟了TC的发生和径迹密度。频谱方案还为TC对年际变化的响应提供了更好的结果（例如，厄尔尼诺南方涛动，ENSO），以抑制对ENSO的过度对流响应。频谱方案能够模拟与Madden–Julian涛动（MJO）有关的TC成因的变化，这要比原始对流方案好得多。因此，在从各个角度模拟全球TC活动时，频谱方案都可以胜过原始对流方案，因此，该方案有望用于TC预测和未来预测。
更新日期：2020-12-21
中文翻译：
光谱积云参数化对模拟AGCM中全球热带气旋活动的影响
研究了一种新的光谱积云参数化（光谱方案）对模拟大气环流模型（AGCM）中的全球热带气旋（TC）活动的影响。使用AFES（地球模拟器的AGCM）和两种不同的对流方案（AGCM的原始对流方案（伊曼纽尔方案）和光谱方案）进行了实验。结果表明，这两种方案都可以从气候，变异性和强度方面捕获全球TC活动的定性特征。但是，通过改善对流层上方的冷偏光，该频谱方案比原始对流方案更好地模拟了TC的发生和径迹密度。频谱方案还为TC对年际变化的响应提供了更好的结果（例如，厄尔尼诺南方涛动，ENSO），以抑制对ENSO的过度对流响应。频谱方案能够模拟与Madden–Julian涛动（MJO）有关的TC成因的变化，这要比原始对流方案好得多。因此，在从各个角度模拟全球TC活动时，频谱方案都可以胜过原始对流方案，因此，该方案有望用于TC预测和未来预测。
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