青藏高原牧区大雪期间的水汽和热量平衡

THE BALANCE OF MOISTURE AND HEAT DURING SNOW PRECIPITATION IN GRAZING REGION IN THE PLATEAU

本文通过对１９９６年１月青藏高原牧区大雪期间的水汽和热量收支的计算，分析了大雪期间对流活动的作用和贡献，并与其他地区夏季暴雨期间的能量平衡进行了比较。结果表明，二者都只有一个无辐散层和整层维持上升运动，不同的是降雪期间：１）视水汽汇气柱平均潜热加热率要小得多；２）视水汽汇和视热源的垂直分布差异较大；

The present has calculated the moisture and heat budgets during snow in grazing region in the plateau in the second ten days on January 1996,analysed the influence and contribution of convective action, compared conservative features of energy with other region during summer rainstorm. The results indicates that they have one nondivergence layer and vertical ascend maintained in whole stratum. The differences are :1) Apparent moisture sink heating rate is much smaller; 2)There are greater difference for vertical distribution of between apparent moisture sink and apparent heat source; 3)Subgrid scale disturbence vertical transport occoured nearby the top of troposphere, for snow mainly.