Background tropospheric aerosols: Incorporation within a statistical‐dynamical climate model
Background tropospheric aerosols: Incorporation within a statistical‐dynamical climate model
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DOI：
10.1029/jd089id06p09521
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发表时间：
1984-10
影响因子：
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通讯作者：
G. Potter;R. Cess
中科院分区：
文献类型：
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作者：
G. Potter;R. Cess
为了评估自然背景对流层气溶胶对地球当前气候的可能影响，我们将大陆和海洋气溶胶的气溶胶辐射模式纳入了劳伦斯·利弗莫尔国家实验室统计-动力气候模式。模式结果表明，背景对流层气溶胶产生3°-4°C的全球表面冷却，最大冷却发生在高纬度，这一结果与Coakley等人的能量平衡气候模式研究基本一致。(1983)。为了具体说明气溶胶直接造成的影响，而不是气溶胶引起的气候变化造成的间接影响，考虑了第二个气候扰动，其中包括减少太阳常数，以便使地面-大气太阳吸收的初始减少量与包括对流层气溶胶时完全相同。这些不同的气候扰动产生了几乎相同的气候反馈效应，以及大气稳定性和水循环的相似变化，尽管这两个扰动在纬度和垂直分布上有很大不同。这一发现与Manabe和Wetherald(1980)关于大气CO2和太阳常数摄动的大气环流模型研究是一致的。一个相关的结论是，模式对对流层气溶胶的气候响应对气溶胶垂直分布的方式不敏感。
To evaluate the possible influence of natural background tropospheric aerosols upon the earth's present climate, we have incorporated aerosol radiation models for continental and maritime aerosols into the Lawrence Livermore National Laboratory statistical-dynamical climate model. The model results suggest that background tropospheric aerosols produce 3°–4°C global surface cooling, with maximum cooling occurring at high latitudes, results which are essentially consistent with an energy balance climate model study by Coakley et al. (1983). To specifically delineate effects caused directly by the aerosols, as opposed to indirect effects resulting from aerosol-induced climate change, a second climate perturbation was considered that consisted of reducing the solar constant so as to give exactly the same initial reduction in surface-atmosphere solar absorption as for the inclusion of tropospheric aerosols. These separate climate perturbations produced nearly identical climate feedback effects, together with similar changes in atmospheric stability and hydrological cycle, despite the fact that the two perturbations have quite different latitudinal and vertical distributions. This finding is consistent with a general circulation model study by Manabe and Wetherald (1980) concerning perturbations of both atmospheric CO2 and the solar constant. A related conclusion is that the model's climate response to tropospheric aerosols is insensitive to the manner in which the aerosols are vertically distributed.