CO emissions from biomass burning in South-east Asia in the 2006 El Niño year: shipboard and AIRS satellite observations
Hideki Nara A , Hiroshi Tanimoto A B , Yukihiro Nojiri A , Hitoshi Mukai A , Jiye Zeng A , Yasunori Tohjima A and Toshinobu Machida A
+ Author Affiliations
- Author Affiliations
A National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
B Corresponding author. Email: tanimoto@nies.go.jp
Environmental Chemistry 8(2) 213-223 https://doi.org/10.1071/EN10113
Submitted: 15 October 2010 Accepted: 21 March 2011 Published: 2 May 2011
Environmental context. Atmospheric carbon monoxide greatly affects the abundance of environmentally important gases, including methane, hydrochlorofluorocarbons and tropospheric ozone. We present evidence for episodes of CO pollution over the tropical Pacific Ocean resulting from intensive biomass burning in South-east Asia and Northern Australia during the 2006 El Niño year. We discuss the locations of the CO emissions and their long-range transport.
Abstract. Biomass burning is often associated with climate oscillations. For example, biomass burning in South-east Asia is strongly linked to El Niño–southern oscillation activity. During October and November of the 2006 El Niño year, a substantial increase in CO mixing ratios was detected over the Western tropical Pacific Ocean by shipboard observations routinely operated between Japan and Australia and New Zealand. Combining in-situ measurements, satellite observations, and an air trajectory model simulation, two high CO episodes were identified originating from biomass burning in Borneo, Sumatra, New Guinea, and Northern Australia. Between 15°N and the Equator, marked CO enhancements were encountered associated with a significant correlation between CO and CO2 and between CO and O3. The ΔCO/ΔCO2 ratio observed in the fire plume was considerably high (171 ppbv ppmv–1), suggesting substantial contributions from peat soil burning in Indonesia. In contrast, the ΔO3/ΔCO ratio was only 0.05 ppbv ppbv–1, indicating that net photochemical production of O3 in the plume was negligible during long-range transport in the lower troposphere over the Western tropical North Pacific.
Additional keywords: atmospheric infrared sounder, carbon monoxide, global fire emissions database, Pacific Ocean, peat burning, voluntary observing ship.
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