Equilibration of an Atmosphere by Adiabatic Eddy Fluxes
Equilibration of an Atmosphere by Adiabatic Eddy Fluxes
复制标题
通过绝热涡流平衡大气
DOI：
10.1175/jas-d-13-013.1
复制
发表时间：
2013
影响因子：
3.1
通讯作者：
R. Ferrari
中科院分区：
文献类型：
--
作者：
M. Jansen;R. Ferrari
气候研究的一个主要问题是量化湍流涡通量在维持观测到的大气平均状态中的作用。赤道到极地的温度梯度和温带外大气的静态稳定性都是由这些涡旋通量和辐射强迫之间的平衡决定的。等熵斜率的调整一直是人们关注的问题，它关系到静力稳定性和经向温度梯度。人们经常争辩说，温带大气总是平衡的，这样离开亚热带表面的等熵就会到达两极附近的对流层顶。然而，最近的研究挑战了这一论点。本文重新讨论了干燥大气的平衡平均状态的标度争论，这是辐射强迫和沿等熵的涡热通量之间的平衡的结果。这些论点预测了等熵斜率对辐射强迫变化的弱敏感性，这与以前的结果一致。大的..。
AbstractA major question for climate studies is to quantify the role of turbulent eddy fluxes in maintaining the observed atmospheric mean state. Both the equator-to-pole temperature gradient and the static stability of the extratropical atmosphere are set by a balance between these eddy fluxes and the radiative forcing. Much attention has been paid to the adjustment of the isentropic slope, which relates the static stability and the meridional temperature gradient. It is often argued that the extratropical atmosphere always equilibrates such that isentropes leaving the surface in the subtropics reach the tropopause near the poles. However, recent work challenged this argument. This paper revisits scaling arguments for the equilibrated mean state of a dry atmosphere, which results from a balance between the radiative forcing and the along-isentropic eddy heat flux. These arguments predict weak sensitivity of the isentropic slope to changes in the radiative forcing, consistent with previous results. Large ...