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中文摘要：
利用2007年12月的加密探空资料,对高原东部及其下游地区的边界层结构和高原东部边界层变化对下游大气的影响进行了分析。结果表明,冬季青藏高原东部夜间近地面逆温层可以发展到平均500 m的高度,白天混合层可以发展到平均2000 m的高度。白天混合层内水汽和风速混合十分均匀,在混合层发展成熟时存在十分深厚的逆湿层。冬季青藏高原下游的四川盆地,边界层内温度日较差小,夜间逆温层把大量地表水汽截留在近地层,日出前近地层水汽容易达到饱和。白天,混合层在中午发展成熟,平均高度只有300 m。四川盆地对流层下部存在非常强的逆温层,该逆温层是青藏高原抬升地表加热和冬季盛行西风气流形成的,逆温层变化是青藏高原东部边界层温度日变化和局地西风变化的共同结果。逆温层显著改变大气动量、热量和水汽的垂直分布。与对流层下部逆温相联系的中层云对辐射的影响是造成四川盆地温度日较差和混合层高度变化的原因。
英文摘要：
The atmospheric boundary layer （ABL） structure in east part and downstream of Tibetan Plateau （TP） was investigated utilizing the intensifying radiosonde data in December 2007. The results indicate that there is a surface based temperature inversion layer （SBTIL） with an average heights of 500 m at nighttime, and a mixed layer （ML） with the heights of 2000 m in east part of TP in winter. The water vapor and wind speed were well mixed in the ML, and there is a deeply humidity inversion layer （HIL） when the ML was matured. The diurnal range is small and the SBTIL trap water vapor in surface layer （SL）, and the water vapor may be saturated before sunrise in Sichuan Basin where the downstream of TP. At daytime, the ML will mature in the midday and its height is only 300 m at the average level. There is a stronger temperature inversion layer at lower troposphere （TILLT） over Sichuan Basin, which was produced by the effect of elevated heating cased by TP and the west wind in winter. The variations of the TILLT arise from the diurnal variations of air temperature at ABL in east part of TP and local westerly. The vertical distribution of atmospheric momentum, heat and water vapor were strongly changed by the TILLT. The change of radiation caused by the stratus depended on the TILLT is the main reason why there is a small diurnal range and lower ML height.
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