Response of the Atmospheric Boundary Layer and Soil Layer to a High Altitude, Dense Aerosol Cover
Response of the Atmospheric Boundary Layer and Soil Layer to a High Altitude, Dense Aerosol Cover
复制标题
大气边界层和土壤层对高海拔、浓密气溶胶覆盖的响应
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
K. Walsh
中科院分区：
文献类型：
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作者：
J. Garratt;A. Pittock;K. Walsh
摘要 在大气中尺度数值模型中研究了大气边界层对高空烟雾层出现的响应。重点是引入吸收光学深度 (AOD) 在 0 到 1 范围内的烟雾时平均边界层结构和近地表温度的变化。在 30°S 温度下，针对不同的土壤热特性和表面湿度，在几天的时间段内进行了计算，在此期间发生了主要的烟雾引起的冷却。烟雾的存在降低了白天的混合层深度，并且对于足够大的 AOD 值，会导致白天的地表逆温，并且大量冷却仅限于小于几百米的高度。烟雾引起的白天土壤和气温降低几度是很常见的，这主要取决于土壤湿度和烟雾 AOD。每当有与海浪相关的大量陆上气流时，靠近海岸的地方就会经历冷却减少。
Abstract The response of the atmospheric boundary layer to the appearance of a high-altitude smoke layer has been investigated in a mesoscale numerical model of the atmosphere. Emphasis is placed on the changes in mean boundary-layer structure and near-surface temperatures when smoke of absorption optical depth (AOD) in the, range 0 to 1 is introduced. Calculations have been made at 30°S, for different soil thermal properties and degrees of surface wetness, over a time period of several days during which major smoke-induced cooling occurs. The presence of smoke reduces the daytime mixed-layer depth and, for large enough values of AOD, results in a daytime surface inversion with large cooling confined to heights of less than a few hundred meters. Smoke-induced reductions in daytime soil and air temperatures of several degrees are typical, dependent critically upon soil wetness and smoke AOD. Locations near the coast experience reduced cooling whenever there is a significant onshore flow related to a sea br...