Effects of Siberian forest fires on regional air quality and meteorology in May 2003 Rokjin J. Park with Daeok Youn, Jaein Jeong, Byung-Kwon Moon Seoul.

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Presentation transcript:

Effects of Siberian forest fires on regional air quality and meteorology in May 2003 Rokjin J. Park with Daeok Youn, Jaein Jeong, Byung-Kwon Moon Seoul National University The 4 th GEOS-Chem meeting, Harvard University April 8, 2009

MAY 2003 SIBERIAN FOREST FIRES MODIS/Terra AOD fine May 2003 [Generoso et al., 2007] MODIS fire observations [Lee et al., 2005] Smoke from Siberian fires ADEOS-2 satellite image for May 22, 2003 KOREA JAPAN Siberian Forest Fire Emissions (Tg C mon -1 ) [Giglio et al., 2006] factor of 3-10 higher than others

OBJECTIVE AND METHODS Quantify the effect of the Siberian forest fires on regional air quality over East Asia in May Examine the impact of Siberian fire aerosols on regional meteorology over East Asia GEOS-Chem Global 3-D Chemical-Transport Model - spatial resolution of 2°x2.5°, 30 vertical levels, 54 tracers - driven by assimilated GEOS-4 meteorological fields from the NASA GMAO -biomass burning emissions for 2003 : Global Fire Emissions Database version 2 (GFED2) based on satellite derived monthly burned areas Community Climate System Model version 3.0 (CCSM3), NCAR coupled global climate model -Include atmosphere, ocean, vegetation, sea -Spatial resolution of 2°x2.5° -Use GEOS-Chem aerosols in CCSM3 simulations in May 2003 AERONET EANET

Fire aerosols increased hourly mean surface PM 2.5 concentrations up to 108 ㎍ m -3 at the Rishiri site. MAY 2003 COMPARISON OF SIMULATED VS. OBSERVED DAILY MEAN PM 2.5 CONCENTRATIONS AT RISHIRI SITE

COMPARISONS OF OBSERVED AND SIMULATED MONTHLY MEAN VALUES IN MAY 2003 (= 0.9) w/o Yusuhara

MONTHLY MEAN AOD (550 nm) for East Asian Continent

ENHANCEMENTS IN MONTHLY MEAN SURFACE PM 10, O 3 CONCENTRATIONS AND RESULTING RADIATIVE FORCING 6-20 ppbv 5-30 μg m -3 At the surface – 0.0 (-5.8) At TOA -9.3 – 0.0 (-1.5) W m -2 RADIATIVE FORCING Δ PM 10 (7 μg m -3 ) Δ O 3 (8 ppbv)

Effects of Siberian forest fires on meteorology over East Asia in May 2003: CCSM3 vs. NCEP reanalysis II Δ Surface Air Temp Δ Surface Pressure Δ Precipitable water NCEP R-II anomaly for May 2003 ( climatology) CCSM3 differences (fire-nofire) KhPakg m -2 Statistically 99% significant anomaly data in May 2003

CONCLUSIONS The peak increase in monthly mean aerosol concentrations in surface air from the Siberian forest fires was up to 100 µg/m 3 over Siberia in May 2003 In the downwind regions of East Asia, the increases ranged from 5 to 50 µg/m 3. Resulting shortwave radiative forcing of fire aerosols averaged over the East Asia was -5.8 W m -2 at the surface and -1.5 W m -2 at the TOA, indicating a considerable solar absorption in the atmosphere. CCSM3 simulations showed significant changes in meteorological variables over East Asia caused by aerosols from the Siberian forest fires. Simulated changes including increases in cloud and precipitations over the NW pacific were consistent with the NCEP reanalysis II anomaly data for May 2003, indicating an important role of fire aerosols for regional climate. The changes in meteorological variables due to fires have an effect on regional air quality by changing ozone and aerosol concentrations, implying an interaction between regional climate and regional air quality over East Asia which needs to be further investigated.