摘要
利用基于拉格朗日方法的轨迹模式(HYSPLIT_4.9),结合海量气块追踪分析法,对比了江淮梅雨和淮北雨季平均水汽输送特征,从水汽来源及源地贡献方面探讨二者的相对独立性,对比两雨季降水异常年水汽输送特征。结果表明,气候态上,江淮梅雨的水汽输送主要来自印度洋、太平洋、孟湾—南海,其中来自印度洋的水汽输送贡献最大,超过50%;淮北雨季来自印度洋、欧亚大陆、孟湾—南海、太平洋的水汽贡献差异不大,但与江淮梅雨的水汽源地对比,淮北雨季来自印度洋的水汽输送贡献少20%,而欧亚大陆偏多19%。对比降水异常年发现,来自印度洋、孟湾—南海以及欧亚大陆水汽贡献的变化对江淮梅雨和淮北雨季降水异常有重要影响。江淮梅雨偏多年,印度洋的水汽输送贡献比梅雨偏少年减少17%,孟湾—南海则增加了11%。在淮北雨季偏多年,印度洋的水汽输送贡献比偏少年多19%,孟湾—南海和欧亚大陆的水汽输送则分别减少6%和17%。
Using an airflow trajectory model based on the Lagrangian method （HYSPLIT_4.9）, combined with the massive gas block tracking method, the moisture transport characteristics of Meiyu in the Yangtze-Huaihe River region （YHMY） and Huaibei rainy season （HRS） are discussed and compared quantitatively in this study. The YHMY and HRS are shown to be two independent rainy seasons. The moisture in YHMY mainly comes from the Indian Ocean, the Pacific Ocean, and the Bay of Bengal-the South China Sea. Water vapor from the Indian Ocean accounts for more than 50% of the moisture in YHMY. For HRS, there is little difference between the Indian Ocean, the Pacific Ocean, the Bay of Bengal-the South China Sea, and the Eurasian continent. Compared to YHMY, the moisture from Indian Ocean decreases 20%, while the moisture from the Eurasian continent increases 19% during HRS. The water vapor from the Indian Ocean, the Pacific Ocean, and the Eurasian continent has a significant influence on the differences between YHMY and HRS in abnormal years. In wet YHMY years, the water vapor from Indian Ocean is 17% less than that in dry YHMY years, while the water vapor from Bay of Bengal-the South China Sea is 20% higher than in dry YHMY years. In wet HRS years, the moisture from the Indian Ocean is 19% higher than in dry HRS years.
出处
《大气科学》
CSCD
北大核心
2014年第5期965-973,共9页
Chinese Journal of Atmospheric Sciences
基金
国家自然科学基金重点项目41230528
国家重点基础研究发展计划项目2012CB955204
2010CB950401
江苏省研究生培养创新计划N0782002156
江苏高校优势学科建设工程资助项目PAPD
江苏省高校"青蓝工程"创新团队项目
关键词
拉格朗日气块追踪法
水汽输送
江淮梅雨
淮北雨季
Lagrangian gas block tracking method
Water vapor transportation
Meiyu in the Yangtze-Huaihe River region
Huaibei Rainy season
