A new transport mechanism of biomass burning from Indochina as identified by modeling studies 1Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan
2National Center for Atmospheric Research, Boulder, Colorado, USA
3Department of Geology, Chinese Culture University, Taipei, Taiwan
4Goddard Earth Sciences and Technology Center, NASA, Greenbelt, Maryland, USA
Received: 17 April 2009 – Published in Atmos. Chem. Phys. Discuss.: 15 June 2009 Abstract. Biomass burning in the Indochina Peninsula (Indochina) is one of the
important ozone sources in the low troposphere over East Asia in springtime.
Moderate Resolution Imaging Spectroradiometer (MODIS) data show that 20 000
or more active fire detections occurred annually in spring only from 2000 to
2007. In our tracer modeling study, we identify a new mechanism transporting
the tracer over Indochina that is significantly different from the vertical
transport mechanism over the equatorial areas such as Indonesia and Malaysia.
Simulation results demonstrate that the leeside troughs over Indochina play a
dominant role in the uplift of the tracer below 3 km, and that the strong
westerlies prevailing above 3 km transport the tracer. These fundamental
mechanisms have a major impact on the air quality downwind from Indochina
over East Asia. The climatological importance of such a leeside trough is
Revised: 21 September 2009 – Accepted: 23 September 2009 – Published: 21 October 2009
Citation: Lin, C.-Y., Hsu, H.-m., Lee, Y. H., Kuo, C. H., Sheng, Y.-F., and Chu, D. A.: A new transport mechanism of biomass burning from Indochina as identified by modeling studies, Atmos. Chem. Phys., 9, 7901-7911, doi:10.5194/acp-9-7901-2009, 2009.