Japan Geoscience Union Meeting 2018

Presentation information

[EJ] Evening Poster

A (Atmospheric and Hydrospheric Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS06] Atmospheric Chemistry

Wed. May 23, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Yoko Iwamoto(Graduate School of Biosphere Science, Hiroshima University), Tomoki Nakayama(Graduate School of Fisheries and Environmental Sciences, Nagasaki University), Sakae Toyoda(東京工業大学物質理工学院, 共同), Nawo Eguchi(Kyushu University)

[AAS06-P23] Long-range transport of carbon monoxide and black carbon from East Asia to the Arctic

*Kohei Ikeda1, Hiroshi Tanimoto1, Takafumi Sugita1, Hideharu Akiyoshi1 (1.National Institute for Environmental Studies)

Keywords:Arctic, Black carbon, Long-range transport, SLCP, Asia

We examined long-range transport events of carbon monoxide (CO) and black carbon (BC) from East Asia to the Arctic with satellite measurements and a global chemical transport model GEOS-Chem. The transport patterns and meteorological conditions associated with the events were analyzed. We used Infrared Atmospheric Sounding Interferometer (IASI) data during 2007–2011 to identify transport events of CO reaching the Arctic. Temporal variations of CO column over the Pacific side of the Arctic (160°–200°E, 60°–80°N) showed that episodic increases occurred several times in each season. We identified 11 strong events (6 in spring, 3 in autumn, and 2 in winter) caused by the long-range transport from East Asia using tagged BC and CO simulations. Two transport pathways from East Asia to the Arctic were found over Siberia and the North Pacific. In the pathway over Siberia, pollutants were transported northeastward from China mainly through the Okhotsk Sea and East Siberia. The low pressures passing from the East Siberia to the Okhotsk Sea played important roles on the transport in the lower troposphere and uplifting to the middle troposphere. In the pathway over the North Pacific, pollutants were transported eastward from the Asian continent and subsequent northward transport took place over the North Pacific. The poleward transport occurred west of the high pressure that stayed around the Bering Sea. While the poleward transport occurred mainly in the middle troposphere over Siberia, the enhancement of BC was also observed by the surface measurement at Barrow for the North Pacific route.