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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Sensitivity of the atmospheric lapse rate to solar cloud absorption in a radiative-convective model - art. no. 4522
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Sensitivity of the atmospheric lapse rate to solar cloud absorption in a radiative-convective model - art. no. 4522

机译：辐射对流模型中大气流失率对太阳云吸收的敏感性-艺术没有。 4522

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摘要

Previous radiative-convective model studies of the radiative forcing due to absorbing aerosols such as soot and dust have revealed a strong dependence on the vertical distribution of the absorbers. In this study, we extend this concept to absorption in cloud layers, using a one-dimensional radiative-convective model employing high, middle, and low cloud representations to investigate the response of the surface temperature and atmospheric lapse rate to increases in visible cloud absorption. The visible single-scattering albedo (ssa) of the clouds is prescribed, ranging from 1.0 to 0.6, where 0.99 is the minimum that would be expected from the presence of absorbing aerosols within the cloud drops on the basis of recent Monterey Area Ship Track ( MAST) Experiment case studies. Simulations are performed with respect to both a constant cloud optical depth and an increasing cloud optical depth and as a function of cloud height. We find that increases in solar cloud absorption tend to warm the troposphere and surface and stabilize the atmosphere, while increases in cloud optical depth cool the troposphere and surface and slightly stabilize the atmosphere between the low cloud top and surface because of the increase in surface cooling. In the absence of considerations involving microphysical or cloud-climate feedbacks, we find that two conditions are required to yield an inversion from a solar cloud absorption perturbation: ( 1) The solar absorption perturbation must be included throughout the tropospheric clouds column, distributing the solar heating to higher altitudes, and ( 2) the ssa of the clouds must be less than or equal to0.6, which is an unrealistically low value. The implication is that there is very little possibility of significant stabilization of the global mean atmosphere due to perturbation of cloud properties given current ssa values. [References: 17]
机译：以前的对流模型研究是由于吸收了烟尘（如烟尘和粉尘）而引起的辐射强迫，已显示出对吸收体垂直分布的强烈依赖。在这项研究中，我们将这一概念扩展到云层中的吸收，使用一维辐射对流模型，采用高，中和低云表示形式来研究表面温度和大气流失速率对可见云吸收增加的响应。规定了可见云的单散射反照率（ssa），范围从1.0到0.6，其中0.99是根据最近的蒙特雷地区船舶航迹（基于最近的蒙特雷地区船舶航迹），在云滴内存在吸收气溶胶的预期最小值（ MAST）实验案例研究。针对恒定的云光学深度和增大的云光学深度以及作为云高度的函数进行仿真。我们发现，太阳云吸收的增加倾向于使对流层和地表变暖并稳定大气，而由于表面冷却的增加，云层光学深度的增加会冷却对流层和地表并使低云顶和地表之间的大气稍微稳定下来。 。在没有涉及微物理或云气候反馈的考虑因素的情况下，我们发现需要两个条件才能使太阳云吸收扰动产生反演：（1）对流层云列中必须包括太阳吸收扰动，以分布太阳加热到更高的高度，并且（2）云的ssa必须小于或等于0.6，这是一个不切实际的低值。这意味着在给定当前ssa值的情况下，由于云特性的扰动，全球平均大气几乎没有明显稳定的可能性。 [参考：17]

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