| タイトル | Recent Biomass Burning in the Tropics and Related Changes in Tropospheric Ozone |
| 本文（外部サイト） | http://hdl.handle.net/2060/20090035623 |
| 著者（英） | Ziemke; Bhartia, P. K.; Schoeberl, M. R.; Chandra, J. R. S.; Duncan, B. N.; Torres, O.; Damon, M. R. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2009-01-01 |
| 言語 | eng |
| 内容記述 | Biomass burning is an important source of chemical precursors of tropospheric ozone. In the tropics, biomass burning produces ozone enhancements over broad regions of Indonesia, Africa, and South America including Brazil. Fires are intentionally set in these regions during the dry season each year to clear cropland and to clear land for human/industrial expansion. In Indonesia enhanced burning occurs during dry El Nino conditions such as in 1997 and 2006. These burning activities cause enhancement in atmospheric particulates and trace gases which are harmful to human health. Measurements from the Aura Ozone Monitoring Instrument (OMI) and Microwave Limb Sounder (MLS) from October 2004-November 2008 are used to evaluate the effects of biomass burning on tropical tropospheric ozone. These measurements show sizeable decreases approx.15-20% in ozone in Brazil during 2008 compared to 2007 which we attribute to the reduction in biomass burning. Three broad biomass burning regions in the tropics (South America including Brazil, western Africa, and Indonesia) were analyzed in the context of OMI/MLS measurements and the Global Modeling Initiative (GMI) chemical transport model developed at Goddard Space Flight Center. The results indicate that the impact of biomass burning on ozone is significant within and near the burning regions with increases of approx.10-25% in tropospheric column ozone relative to average background concentrations. The model suggests that about half of the increases in ozone from these burning events come from altitudes below 3 km. Globally the model indicates increases of approx.4-5% in ozone, approx.7-9% in NO, (NO+NO2), and approx.30-40% in CO. |
| NASA分類 | Geophysics |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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