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- Title
Precipitation Isotopes Associated with the Duration and Distance of Moisture Trajectory in a Westerly-Dominant Setting.
- Authors
Wang, Shengjie; Du, Mingxia; Zhang, Mingjun; Shi, Mengyu; Jiao, Rong; Wang, Liwei
- Abstract
A Lagrangian diagnostic adjusted using specific humidity, with 6 h intervals along the trajectory and with lifting condensation level as cloud base height, was employed to identify the moisture source regions around the Tianshan Mountains, northwest China. Then, the relationship between precipitation stable isotopes and diagnosed duration–distance of moisture trajectory was analyzed. In this region, the median value of transport duration from moisture source to precipitation sampling site is approximately 3 days, and most moisture sources are closer than 1000 km. According to the Lagrangian diagnosed moisture sources, the higher precipitation summer months usually have rapid air mass movement, and remotely sourced moisture can be delivered to arid central Asia; in the dryer winter months, the moisture loading is weak, and longer transport duration and shorter source distances are observed. As trajectory duration increases, δ18O in sampled precipitation shows a positive trend, especially on the northern slope, and the short-duration events are usually significantly impacted by local recycled moisture with depleted isotopic signatures. The northern slope usually shows relatively shorter duration and longer distance, and more distant sources have more enriched isotopic values.
- Subjects
CHINA; ASIA; MOISTURE; METEOROLOGICAL precipitation; ISOTOPES; STABLE isotopes; ISOTOPIC signatures; AIR masses
- Publication
Water (20734441), 2019, Vol 11, Issue 12, p2434
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w11122434