Varied midlatitude shortwave cloud radiative responses to Southern Hemisphere circulation shifts
Varied midlatitude shortwave cloud radiative responses to Southern Hemisphere circulation shifts
复制标题
中纬度短波云对南半球环流变化的不同辐射响应
DOI：
10.1002/asl.1068
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发表时间：
2021
影响因子：
3
通讯作者：
Grise, Kevin M.
中科院分区：
文献类型：
--
作者：
Kelleher, Mitchell K.;Grise, Kevin M.
普遍认为，由于大气环流模式的变化而引起的中纬度云层的变化是气候系统辐射反馈的一个潜在来源。以前的工作表明，两个一般环流的变化预计会发生在气候变暖，极转移中纬度急流和极扩展的哈德利环流，与不同的影响中纬度云。本研究检验了两个动力学云控制因素，对流层中层垂直速度和海洋边界层温度反演的估计反演强度（EIS），以解释为什么南半球中纬度急流和Hadley环流边缘的向极移动在中纬度具有不同的短波云辐射响应。在垂直速度和EIS的变化发生进一步赤道向极移动的Hadley细胞边缘比他们的中纬度急流的极向移动。由于短波云辐射效应（SWCRE）对垂直速度和EIS变化的敏感性是纬度的函数，因此与急流和Hadley环流移动相关的SWCRE异常不同。在SWCRE对垂直速度变化的敏感性和EIS平衡的情况下，与极向急流偏移相关的动力学变化进一步向极方向发生，导致中纬度SWCRE在极向急流偏移时接近净零变化。相反，与Hadley环流扩张相关的动力学变化发生在更靠近赤道的纬度，在那里SWCRE的敏感性与对流层中部垂直速度的变化更紧密相关，导致中纬度地区的净短波云辐射变暖效应。
Changes in midlatitude clouds as a result of shifts in general circulation patterns are widely thought to be a potential source of radiative feedbacks onto the climate system. Previous work has suggested that two general circulation shifts anticipated to occur in a warming climate, poleward shifts in the midlatitude jet streams and a poleward expansion of the Hadley circulation, are associated with differing effects on midlatitude clouds. This study examines two dynamical cloud‐controlling factors, mid‐tropospheric vertical velocity, and the estimated inversion strength (EIS) of the marine boundary layer temperature inversion, to explain why poleward shifts in the Southern Hemisphere midlatitude jet and Hadley cell edge have varying shortwave cloud‐radiative responses at midlatitudes. Changes in vertical velocity and EIS occur further equatorward for poleward shifts in the Hadley cell edge than they do for poleward shifts of the midlatitude jet. Because the sensitivity of shortwave cloud radiative effects (SWCRE) to variations in vertical velocity and EIS is a function of latitude, the SWCRE anomalies associated with jet and Hadley cell shifts differ. The dynamical changes associated with a poleward jet shift occur further poleward in a regime where the sensitivities of SWCRE to changes in vertical velocity and EIS balance, leading to a near‐net zero change in SWCRE in midlatitudes with a poleward jet shift. Conversely, the dynamical changes associated with Hadley cell expansion occur further equatorward at a latitude where the sensitivity of SWCRE is more strongly associated with changes in mid‐tropospheric vertical velocity, leading to a net shortwave cloud radiative warming effect in midlatitudes.
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影响因子：
4.4
作者：
Gordon, ND;Norris, JR;Klein, SA
通讯作者：
Klein, SA
观测和模型中中纬度云辐射效应对云控制因素的敏感性：与南半球急流变化和气候敏感性的关系
影响因子：
4.9
作者：
Grise, Kevin M.;Kelleher, Mitchell K.
通讯作者：
Kelleher, Mitchell K.
影响因子：
4.9
作者：
Grise, Kevin M.;Medeiros, Brian
通讯作者：
Medeiros, Brian
影响因子：
5.1
作者：
Eyring, Veronika;Bony, Sandrine;Taylor, Karl E.
通讯作者：
Taylor, Karl E.
观测到的北环模/北大西洋涛动、云入射和云辐射强迫之间的联系
影响因子：
5.2
作者：
Ying Li;D. Thompson;Yi Huang;Minghong Zhang
通讯作者：
Minghong Zhang