| 兰州冬季城市烟雾层辐射效应的观测分析研究 |
| 摘要点击 1739 全文点击 1742 投稿时间：1993-03-08 |
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| 中文关键词 城市烟雾层 兰州市 大气污染 消光率 长波辐射 短波辐射 地面辐射差额 |
| 英文关键词 urban smog layer short-wave heating long-wave cooling rate extinction coefficient surface radiation balance |
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| 中文摘要 |
| 冬季兰州城市上空形成浓厚的烟雾层.利用1990年11月兰州大学和离城市地面625m高南山顶的辐射和探空资料,分析和计算了烟雾层的辐射效应.兰州城市烟雾层具有浑浊度系数大波长指数小的特点.对到达地面的太阳辐射有很强的削弱.浑浊度系数最大时,烟雾层内的平均加热率为6.16℃/d,大气层对各波段的消光强弱不同,对可见光削减最大.同时烟雾层使到达兰州地面的大气逆辐射比南山顶增加5.2%,总的入射辐射比南山顶小5.6%,地面辐射差额比南山顶小67.8%.烟雾层的存在增加了城市边界层的稳定性. |
| 英文摘要 |
| In winter, there is a dense smog layer over Lanzhou city.In this paper, use the radiative and sonde data obtained in December 1990 at Lanzhou University and at the top of the South-mountain which is 625 m high to analyse and calculate the radiative effects of the smog layer.The Lanzhou urban smog layer is characterized by a high turbidity coefficient and a low wave length exponent,and decreases the solar radiation significantly.The average heating rate of the smog layer is 6.16℃/dvwith maximum turbidity coefficient.The smog layer has different extinctionsto different wave intervals and has a strongest extinction to the visible part.The smog layer causes the counter radiation reaching Lanzhou surface 5.2% more than that of the South-mountain,total incoming radiation is 5.6% less than that of the South-mountain,and surface radiation balance is 67.8% less than that of the South-mountain.The existence of the smog layer increases the stability of the urban boundary layer. |
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