Analytic radiative‐advective equilibrium as a model for high‐latitude climate
Analytic radiative‐advective equilibrium as a model for high‐latitude climate
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DOI：
10.1002/2015gl067172
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发表时间：
2016-01
影响因子：
5.2
通讯作者：
T. Cronin;M. Jansen
中科院分区：
文献类型：
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作者：
T. Cronin;M. Jansen
我们提出辐射-平流平衡作为高纬度大气的基本状态模式。温度分布是由大气短波吸收和对流热通量辐合的稳定与地表短波吸收的不稳定之间的竞争决定的。我们推导了温度分布的解析表达式，假设幂律大气加热分布是压力和两流窗灰色长波辐射传输的函数。我们讨论了有和没有大气窗口的例子剖面，并表明地表温度对强迫的敏感性取决于强迫的性质，对增加的光学厚度引起的辐射强迫的敏感性最大，对增加的大气热输运的敏感性最低。地表温度对强迫敏感性的这些差异可以用强迫相关的递减率反馈来解释。
We propose radiative‐advective equilibrium as a basic‐state model for the high‐latitude atmosphere. Temperature profiles are determined by a competition between stabilization by atmospheric shortwave absorption and advective heat flux convergence, and destabilization by surface shortwave absorption. We derive analytic expressions for temperature profiles, assuming power law atmospheric heating profiles as a function of pressure and two‐stream windowed‐gray longwave radiative transfer. We discuss example profiles with and without an atmospheric window and show that the sensitivity of surface temperature to forcing depends on the nature of the forcing, with greatest sensitivity to radiative forcing by increased optical thickness and least sensitivity to increased atmospheric heat transport. These differences in sensitivity of surface temperature to forcing can be explained in terms of a forcing‐dependent lapse‐rate feedback.