青藏高原低涡(TPV)是影响青藏高原天气气候的重要低压系统。研究TPV的水循环对于进一步了解TPV及其造成的灾害性天气具有重要意义。本研究不同于以往对TPV个案或青藏高原大气水循环的研究。以移动的TPV天气系统为研究对象,从气候学的角度,基于再分析资料,采用统计方法研究了TPV大气水循环的特征以及影响TPV水循环活动的大气环流。结果表明,TPV水循环主要受外循环影响。TPV水循环整体水汽利用效率先降低后升高,其活性度先降低后升高。TPV降水高值区位于高原中部,年TPV降水量与TPV水循环活动具有较好的相关性。大系统与高原涡旋水循环密切相关。当南亚高压(SAH)强度较大时,西太平洋副热带高压(WPSH)西进,高原主体上空出现较强的暖上升区。当低层高原南侧偏南气流较强时,冠捷水循环较为活跃,易东移,降水较多,反之亦然。且其活性程度先降低后升高。TPV降水高值区位于高原中部,年TPV降水量与TPV水循环活动具有较好的相关性。大系统与高原涡旋水循环密切相关。当南亚高压(SAH)强度较大时,西太平洋副热带高压(WPSH)西进,高原主体上空出现较强的暖上升区。当低层高原南侧偏南气流较强时,冠捷水循环较为活跃,易东移,降水较多,反之亦然。且其活性程度先降低后升高。TPV降水高值区位于高原中部,年TPV降水量与TPV水循环活动具有较好的相关性。大系统与高原涡旋水循环密切相关。当南亚高压(SAH)强度较大时,西太平洋副热带高压(WPSH)西进,高原主体上空出现较强的暖上升区。当低层高原南侧偏南气流较强时,冠捷水循环较为活跃,易东移,降水较多,反之亦然。TPV降水高值区位于高原中部,年TPV降水量与TPV水循环活动具有较好的相关性。大系统与高原涡旋水循环密切相关。当南亚高压(SAH)强度较大时,西太平洋副热带高压(WPSH)西进,高原主体上空出现较强的暖上升区。当低层高原南侧偏南气流较强时,冠捷水循环较为活跃,易东移,降水较多,反之亦然。TPV降水高值区位于高原中部,年TPV降水量与TPV水循环活动具有较好的相关性。大系统与高原涡旋水循环密切相关。当南亚高压(SAH)强度较大时,西太平洋副热带高压(WPSH)西进,高原主体上空出现较强的暖上升区。当低层高原南侧偏南气流较强时,冠捷水循环较为活跃,易东移,降水较多,反之亦然。西太平洋副热带高压(WPSH)西进,高原主体上空有较强的暖上升区。当低层高原南侧偏南气流较强时,冠捷水循环较为活跃,易东移,降水较多,反之亦然。西太平洋副热带高压(WPSH)西进,高原主体上空有较强的暖上升区。当低层高原南侧偏南气流较强时,冠捷水循环较为活跃,易东移,降水较多,反之亦然。
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Characteristics and changes in the atmospheric water cycle of the Tibetan Plateau Vortex
The Tibetan Plateau Vortex (TPV) is an important low-pressure system that affects the weather and climate in the Qinghai-Tibet Plateau. It is of great importance to study the water cycle of the TPV to further understand the TPV and its resulting disastrous weather. This study is different from the previous studies of TPV cases or of the atmospheric water cycle of the Qinghai Tibet Plateau. Focusing on the moving TPV weather system, from the perspective of climatology, the characteristics of the atmospheric water cycle of the TPV and the atmospheric circulation that affects the activity of the TPV water cycle are studied using statistical methods based on the reanalysis data. The results show that the TPV water cycle is mainly affected by external circulation. The overall water vapour utilization efficiency of the TPV water cycle first decreases and then increases, and its activity degree first decreases and then increases. The high-value area of TPV precipitation is located in the middle of the plateau and annual TPV precipitation has a good correlation with TPV water cycle activity. The large-scale system is closely related to the vortex water cycle of the plateau. When the intensity of the South Asian high (SAH) is relatively strong, the West Pacific subtropical high (WPSH) advances westward, and there is a stronger warm rising area over the main body of the plateau. When the southerly airflow on the south side of the low-level plateau is strong, the water cycle of the TPV is more active, easily moves eastward and produces more precipitation, and vice versa.