Superposition of Gobi Dust and Southeast Asian Biomass Burning: The Effect of Multisource Long‐Range Transport on Aerosol Optical Properties and Regional Meteorology Modification. Issue 16 (19th August 2019)

• Record Type: Journal Article
• Authors: Huang, Kan; Fu, Joshua S.; Lin, Neng‐Hui; Wang, Sheng‐Hsiang; Dong, Xinyi; Wang, Guochen
• Is Part Of: Journal of geophysical research. Volume 124:Issue 16(2019)
• Page Start: 9464
• Page End: 9483
• Publication Date: 2019-08-19
• Subjects: Atmospheric physics -- Periodicals; Geophysics -- Periodicals; 551.5
• DOI: 10.1029/2018JD030241
• Languages: English
• ISSNs: 2169-897X

Abstract

Abstract: One unique long‐range transport event with multiple layers of aerosol plumes was observed over Taiwan during 29–31 March 2006. A synergy of ground‐based observation, remote sensing, and backward trajectory simulation collectively indicated the high‐altitude (above 3 km) plume originated from biomass burning in Southeast Asia while the midaltitude (around 0.8–2 km) plume was attributed to dust from the Gobi Desert. Aerosol optical properties measured at a low‐altitude site were characterized of abundant coarse mode particles and increased single scattering albedo as a function of increased wavelength, indicating the influence from dust particles. While at a high mountain site (elevation of ~3 km), aerosol optical depth was elevated by a factor of 3–4 compared to its background value and mainly comprised of fine particles. It was diagnosed that the high‐altitude aerosols were influenced by the transported smoke plumes but exempted from dust. Simulation of the meteorological conditions against a Taiwan‐wide meteorology network showed strong near surface temperature rise of more than 2° during this long‐range transport event as well as for the vertical temperature profiles. Both dust and biomass burning aerosol plumes via long‐range transport contributed significantly to the atmospheric warming, resulting in strong instantaneous aerosol radiative forcing of 46.0 W/m 2 in the atmosphere. A "double dome" warming effect mechanism was proposed that both biomass burning and dust plumes above the boundary layer could efficiently reserve the solar energy and heat the lower troposphere. Key Points: One long‐range transport event with concurring dust and biomass burning aerosol layers was observed over the West Pacific region Strong warming near the surface and at higher tropospheric altitudes was ascribed to the massive aerosol inputs from the transported plumes A "double dome" mechanism effect was proposed that dust and biomass burning plumes at high altitudes could effectively warm the atmosphere