Abstract:
:The East Asian Summer Monsoon driven by temperature and moisture gradients between the Asian continent and the Pacific Ocean, leads to approximately 50% of the annual rainfall in the region across 20-40°N. Due to its increasing scientific and social importance, there have been several previous studies on identification of moisture sources for summer monsoon rainfall over East Asia mainly using Lagrangian or Eulerian atmospheric water vapor models. The major source regions for EASM previously proposed include the North Indian Ocean, South China Sea and North western Pacific. Based on high-precision and high-frequency 6-year measurement records of hydrofluorocarbons (HFCs), here we report a direct evidence of rapid intrusion of warm and moist tropical air mass from the Southern Hemisphere (SH) reaching within a couple of days up to 33°N into East Asia. We further suggest that the combination of direct chemical tracer record and a back-trajectory model with physical meteorological variables helps pave the way to identify moisture sources for monsoon rainfall. A case study for Gosan station (33.25°N, 126.19°E) indicates that the meridional transport of precipitable water from the SH accompanying the southerly/southwesterly flow contributes most significantly to its summer rainfall.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Li S,Park S,Lee JY,Ha KJ,Park MK,Jo CO,Oh H,Mühle J,Kim KR,Montzka SA,O'Doherty S,Krummel PB,Atlas E,Miller BR,Moore F,Weiss RF,Wofsy SCdoi
10.1038/s41598-018-22266-0subject
Has Abstractpub_date
2018-03-16 00:00:00pages
4669issue
1issn
2045-2322pii
10.1038/s41598-018-22266-0journal_volume
8pub_type
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