A22B-08
Satellite-observed NO2, SO2, and HCHO Vertical Column Densities in East Asia: Recent Changes and Comparisons with Regional Model
Tuesday, 15 December 2015: 12:05
3006 (Moscone West)
Hyun C Kim1,2, Pius Lee2, Soontae Kim3, Jungbin Mok4, Hye Lim Yoo5, Changhan Bae3, Byeong-Uk Kim6, Young-Kwon Lim7, Jung-Hun Woo8 and Rokjin Park9, (1)Cooperative Institute for Climate and Satellites University of Maryland, College Park, MD, United States, (2)NOAA Air Resources Laboratory, College Park, MD, United States, (3)Ajou University, Environmental Enginerring, Suwon, South Korea, (4)University of Maryland College Park, Atmospheric and Oceanic Science (AOSC), College Park, MD, United States, (5)NOAA, College Park, MD, United States, (6)Georgia Environmental Protection Division, Atlanta, GA, United States, (7)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (8)Konkuk University, Dept. of Advanced Technology Fusion, Seoul, South Korea, (9)Seoul National University, Earth and Environmental Sciences, Seoul, South Korea
Abstract:
This study reports the recent changes in tropospheric NO2, SO2, and HCHO vertical column densities (VCD) in East Asia observed from multiple satellites, highlighting especially the annual trend changes of NO2 and SO2 over Beijing-Tianjin-Hebei (BTH) region of China since 2010. Tropospheric VCD data from Global Ozone Monitoring Experiment (GOME), SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY), Ozone Monitoring Instrument (OMI) and GOME-2, retrieved from the Royal Netherlands Meteorological Institute (KNMI) and OMI National Aeronautics and Space Administration (NASA) standard products, are utilized to investigate the annual trends of NO2, SO2, and HCHO VCDs from 2001 to 2015. They are also compared with simulations from Community Multi-scale Air Quality Model (CMAQ) based forecast system by the Integrated Multi-scale Air Quality System for Korea (IMAQS-K) of Ajou University. Until 2011, the changes in NO2 VCD over East Asian countries agree well with the findings of previous research, including the impact of the economic downturn during 2008–2009 and the subsequent quick recovery in China. After peaking in 2011, the NO2 VCD observations from active instruments (OMI and GOME-2) over China started to show a slower decreasing trend, mostly led by the rapid changes in the BTH region in northern China. On the other hand, SO2 started to decline earlier, from 2007, but inclined back from 2010 to 2012, and then back to declining trend since 2012. While satellite observations show dramatic recent changes, the model could not reproduce those changes mostly due to its use of fixed emission inventory. We conclude that rapid update of latest emission inventory is necessary for an accurate forecast of regional air quality in east Asia, especially for upcoming international sports events in PyeongChang (Korea), Tokyo (Japan) and Beijing (China) in 2018, 2020 and 2022, respectively.
