边界层气溶胶气候效应的研究

用三维气候模式模拟了边界层气溶胶的气候效应。结果表明，边界层气溶胶可使大气和地表的气候状态发生明显的变化。３００ｈＰ以下气柱中气温升高，地表和土壤温度降低。在气溶胶光学厚度较大的沙漠区上空，水平风场出现气旋性差值环流，垂直上升运动也发生较多变化。降水变化与３００ｈＰａ上垂直运动的变化有很好的正相关。同时讨论了气溶胶气候效应的物理机制。

A STUDY OF CLIMATIC EFFECTS OF BOUNDARY LAYER AEROSOLS

A three-dimensional climate model is used to investigate the climatic effects ofaerosols in the boundary layer. Results show that these aerosols could lead to noticeablechange in the climate conditions both of the atmosphere and at the ground. The temperatureof the air column rises below 300hPa in contrast to that of the surface and soil. Over thedesert areas where the aerosol optical thickness is big,there occur cyclonic differential circu-lations in the horizontal windfields, with change observed in vertical motion. A very goodpositive correlation is found between the changes of precipitation and 300hPa rising. Finally,the physical mechanism of the climatic effects of aerosols is examined.