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, Elliot L Atlas, B. R. Miller, F. Moore, R. F. Weiss, S. C. Wofsy

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Article number4669
JournalScientific Reports
Volume8
Issue number1
DOIs
StatePublished - Dec 1 2018

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air mass
Northern Hemisphere
rainfall
monsoon
moisture
Southern Hemisphere
summer
hydrofluorocarbon
precipitable water
water vapor
tracer
trajectory
chemical
ocean
temperature
Asia

ASJC Scopus subject areas

  • General

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Li, S., Park, S., Lee, J. Y., Ha, K. J., Park, M. K., Jo, C. O., ... Wofsy, S. C. (2018). Chemical evidence of inter-hemispheric air mass intrusion into the Northern Hemisphere mid-latitudes. Scientific Reports, 8(1), [4669]. https://doi.org/10.1038/s41598-018-22266-0

Chemical evidence of inter-hemispheric air mass intrusion into the Northern Hemisphere mid-latitudes. / Li, S.; Park, S.; Lee, J. Y.; Ha, K. J.; Park, M. K.; Jo, C. O.; Oh, H.; Mühle, J.; Kim, K. R.; Montzka, S. A.; O'Doherty, S.; Krummel, P. B.; Atlas, Elliot L; Miller, B. R.; Moore, F.; Weiss, R. F.; Wofsy, S. C.

In: Scientific Reports, Vol. 8, No. 1, 4669, 01.12.2018.

Research output: Contribution to journalArticle

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, EL, Miller, BR, Moore, F, Weiss, RF & Wofsy, SC 2018, 'Chemical evidence of inter-hemispheric air mass intrusion into the Northern Hemisphere mid-latitudes', Scientific Reports, vol. 8, no. 1, 4669. https://doi.org/10.1038/s41598-018-22266-0
Li, S. ; Park, S. ; Lee, J. Y. ; Ha, K. J. ; Park, M. K. ; Jo, C. O. ; Oh, H. ; Mühle, J. ; Kim, K. R. ; Montzka, S. A. ; O'Doherty, S. ; Krummel, P. B. ; Atlas, Elliot L ; Miller, B. R. ; Moore, F. ; Weiss, R. F. ; Wofsy, S. C. / Chemical evidence of inter-hemispheric air mass intrusion into the Northern Hemisphere mid-latitudes. In: Scientific Reports. 2018 ; Vol. 8, No. 1.
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