Southern Hemisphere jet latitude biases in CMIP5 models linked to shortwave cloud forcing
Southern Hemisphere jet latitude biases in CMIP5 models linked to shortwave cloud forcing
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DOI：
10.1029/2012gl053115
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发表时间：
2012-10-05
影响因子：
5.2
通讯作者：
Hartmann, Dennis L.
中科院分区：
文献类型：
--
作者：
Ceppi, Paulo;Hwang, Yen-Ting;Hartmann, Dennis L.
在34个CMIP 5耦合大气环流模式的历史模拟中，发现南半球中纬度地区短波云强迫（SWCF）的偏差高达+/- 30 W m（-2）。SWCF偏差被证明是导致地面温度异常定位在中纬度地区，并显着相关的涡驱动的急流的平均纬度，与负SWCF偏差对应的赤道急流纬度偏差。水行星模型实验表明，射流纬度偏差主要是由中纬度SWCF异常，使射流走向（远离）地区的增强（减少）的温度梯度。结果强调了在最先进的耦合模式中准确地表示云辐射强迫的必要性。引文：Ceppi，P.，Y.-- T. Hwang，D. M. W. Frierson和D. L. Hartmann（2012），与短波云强迫相关的CMIP 5模型中的南半球急流纬度偏差，Geophys。保留信函：39，L19708，doi：10.1029/2012GL053115。
Substantial biases in shortwave cloud forcing (SWCF) of up to +/- 30 W m(-2) are found in the midlatitudes of the Southern Hemisphere in the historical simulations of 34 CMIP5 coupled general circulation models. The SWCF biases are shown to induce surface temperature anomalies localized in the midlatitudes, and are significantly correlated with the mean latitude of the eddy-driven jet, with a negative SWCF bias corresponding to an equatorward jet latitude bias. Aquaplanet model experiments are performed to demonstrate that the jet latitude biases are primarily induced by the midlatitude SWCF anomalies, such that the jet moves toward (away from) regions of enhanced (reduced) temperature gradients. The results underline the necessity of accurately representing cloud radiative forcings in state-of-the-art coupled models. Citation: Ceppi, P., Y.-T. Hwang, D. M. W. Frierson, and D. L. Hartmann (2012), Southern Hemisphere jet latitude biases in CMIP5 models linked to shortwave cloud forcing, Geophys. Res. Lett., 39, L19708, doi:10.1029/2012GL053115.