浙江师范大学史晓宜团队的最新研究，量化了青藏高原东南部温带冰川区再循环水汽对降水的贡献。相关论文发表在2024年6月5日出版的《中国地理科学》杂志上。

据悉，再循环水汽是衡量区域水资源再生能力的重要指标。由于玉龙雪山的存在，中国青藏高原东南部的云南丽江是欧亚大陆上离赤道最近的海洋冰川区。

研究人员利用2017-2018年丽江地区逐日降水资料，结合d-excess模式，量化了季风期和非季风期云下蒸发和再循环水分对降水的影响。结果表明：降水的超标率在-35.6‰和16.0‰之间波动，算术平均值为3.5‰；局地大气降水线(LMWL) δD = 7.91δ¹⁸O+2.50，其斜率略低于全球大气水线(GMWL)。非季风季节的云下蒸发量高于季风季节。主要受相对湿度的影响，在3月份达到峰值。

水蒸气的来源影响了再循环水分的比例。根据混合单粒子拉格朗日积分轨迹模型(HYSPLIT)的结果表明，季风期丽江地区水汽的主要来源为西南季风和东南季风。在非季风期，水汽由西南气流输送。2017年3-10月丽江地区循环水分为10.62%。季风季节与非季风季节差异较大，分别为5.48%和25.65%。这些差异主要被归因于水蒸气平流的变化。再循环水分对丽江地区降水起到了补充作用。

附：英文原文

Title: Quantifying the Contribution of Recycled Moisture to Precipitation in Temperate Glacier Region, Southeastern Tibetan Plateau, China

Author: Ma, Yanwei, Pu, Tao, Shi, Xiaoyi, Ma, Xinggang, Yu, Hongmei

Issue&Volume: 2024-06-05

Abstract: Recycled moisture is an important indicator of the renewal capacity of regional water resources. Due to the existence of Yulong Snow Mountain, Lijiang in Yunnan Province, southeast of the Qinghai-Tibet Plateau, China, is the closest ocean glacier area to the equator in Eurasia. Daily precipitation samples were collected from 2017 to 2018 in Lijiang to quantify the effect of sub-cloud evaporation and recycled moisture on precipitation combined with the d-excess model during monsoon and non-monsoon periods. The results indicated that the d-excess values of precipitation fluctuated between -35.6‰ and 16.0‰, with an arithmetic mean of 3.5‰. The local meteoric water line (LMWL) was δD = 7.91δ18O + 2.50, with a slope slightly lower than the global meteoric water line (GMWL). Sub-cloud evaporation was higher during the non-monsoon season than during the monsoon season. It tended to peak in March and was primarily influenced by the relative humidity. The source of the water vapour affected the proportion of recycled moisture. According to the results of the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model, the main sources of water vapour in Lijiang area during the monsoon period were the southwest and southeast monsoons. During the non-monsoon period, water vapour was transported by a southwesterly flow. The recycled moisture in Lijiang area between March and October 2017 was 10.62%. Large variations were observed between the monsoon and non-monsoon seasons, with values of 5.48% and 25.65%, respectively. These differences were primarily attributed to variations in the advection of water vapour. The recycled moisture has played a supplementary role in the precipitation of Lijiang area.

DOI: 10.1007/s11769-024-1437-6

Source: https://link.springer.com/article/10.1007/s11769-024-1437-6