Chemical evidence of inter-hemispheric air mass intrusion into the Northern Hemisphere mid-latitudes

S. Li, S. Park*, J. Y. Lee, K. J. Ha, M. K. Park, C. O. Jo, H. Oh, J. Mühle, K. R. Kim, S. A. Montzka, S. O'Doherty, P. B. Krummel, E. Atlas, B. R. Miller, F. Moore, R. F. Weiss, S. C. Wofsy

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

6 Citations (Scopus)
232 Downloads (Pure)


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.

Original languageEnglish
Article number4669
Number of pages7
JournalScientific Reports
Publication statusPublished - 16 Mar 2018


Dive into the research topics of 'Chemical evidence of inter-hemispheric air mass intrusion into the Northern Hemisphere mid-latitudes'. Together they form a unique fingerprint.

Cite this