| 摘要: |
| 【目的】为进一步加强对于贵州暖季降水气候规律的认识，提升贵州暖季降水的预测能力。【方法】本文基于站点降水观测资料、NCEP/NCAR全球再分析资料和HadISST海温资料等，利用多种气候统计方法对贵州暖季降水的时空分布特征及其与异常环流之间的联系进行了分析。【结果】贵州暖季降水及其占全年降水量的百分比总体呈现南多北少、西多东少的分布特征，其中西部的干湿季差异更为显著，降水具有更强的集中性；贵州暖季降水存在显著的年际（年代际）变化特征和准20 a、准7a振荡周期；贵州暖季降水分布与前期的印度洋和大西洋局部区域的海温，以及同期的副高脊线和东亚槽位置指数存在显著的相关；当贵州暖季降水异常偏多时，北半球极涡向乌拉尔山和加拿大北部地区有延伸槽区存在，东北亚地区西高东低的环流形势有利于环流经向度的加大和引导冷空气南下影响中国南方地区，伴随贵州北侧上空存在的异常正经圈环流上升支共同影响，使得孟加拉湾和南海的水汽在贵州境内产生明显的辐合抬升，为降水的形成提供有利条件；贵州暖季降水异常分布还与前期秋冬季的北太平洋和北美西海岸、西太平洋，以及北大西洋和赤道大西洋等地区的海温异常密切相关。 |
| 关键词: 贵州；暖季降水；时空分布；环流异常 |
| DOI： |
| 投稿时间：2024-11-05修订日期：2024-11-05 |
| 基金项目: |
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| The Spatiotemporal Distribution of Precipitation during the Warm Season in Guizhou and Its Relationship with Atmospheric Circulation Anomalies |
| Yan Xiaodong,Xiayang,Ren Manlin,Zhang Hao |
| (Guizhou Mountainous Meteorological Science Research Institute;Meteorological Bureau of Qingzhen) |
| Abstract: |
| In order to strengthen the understanding of the climatic patterns and enhance the predictive ability of precipitation in Guizhou during the warm season (PGWS). Based the precipitation observation data, reanalysis data from NCEP/NCAR, and sea surface temperature data from HadISST, the spatial and temporal distribution characteristics of PGWS and its relationship with abnormal circulation using various climate statistical methods is analysed. The results shows that the distribution of PGWS and its percentage of the annual precipitation generally showed the pattern of more in the south and less in the north, more in the west and less in the east. The difference between the dry and wet seasons was more significant and precipitation had a stronger concentration in the western region; There is a significant interannual (decadal) variations and quasi-20 years and quasi-7 years oscillation periods of PGWS; The distribution of PGWS is significantly correlated with the sea surface temperature in the Indian Ocean and Atlantic Ocean in the previous period, as well as the position index of the subtropical high ridge line and the East Asian trough during the same period; When there is an excess of PGWS, there is a trough extending from the polar vortex in the northern hemisphere towards the Ural Mountains and Northern Canada, the circulation pattern in Northeast Asia characterized by a high west and low east is conducive to the increase in meridional circulation and the guidance of cold air southward to affect southern China. This is accompanied by the abnormal positive circulation ascending branch over the northern side of Guizhou, which jointly affects the convergence and uplift of water vapor from Bay of Bengal and the South China Sea within Guizhou, which provided favorable conditions for the formation of precipitation; The distribution of PGWS is also closely related to the SSTA in the North Pacific, the west coast of North America, the western Pacific, the North Atlantic, and the equatorial Atlantic during the previous autumn and winter. |
| Key words: Guizhou; precipitation in warm season; spatial and temporal distribution; circulation anomaly |
