ENSO-Driven Fires Cause Large Interannual Variability in the Naturally Emitted, Ozone-Depleting Trace Gas CH3Br

被引：8

作者：

Nicewonger, M. R. ^{[1
]}

Saltzman, Eric S. ^{[2
,3
]}

Montzka, S. A. ^{[1
]}

机构：

[1] NOAA, Global Monitoring Lab, Boulder, CO 80303 USA

[2] Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA USA

[3] Univ Calif Irvine, Dept Chem, Irvine, CA 92717 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2022年 / 49卷 / 03期

关键词：

biomass burning; ozone; ozone depletion; Montreal Protocol; trace gas; ENSO; ATMOSPHERIC METHYL-BROMIDE; GROWTH-RATE; EL-NINO; EMISSIONS; FLUXES; CHLORIDE; METHANE; DEGRADATION; ALGORITHM; LIFETIME;

D O I：

10.1029/2021GL094756

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Methyl bromide (CH3Br) is an ozone depleting trace gas that is now mainly emitted from natural sources. Roughly 80% of anthropogenic production of CH3Br was phased-out in response to the Montreal Protocol on Substances that Deplete the Ozone Layer beginning in 1999 and atmospheric levels of CH3Br have declined considerably since. Here we use surface measurements of CH3Br from NOAA's global air sampling network, along with a six-box atmosphere/ocean model to explore interannual variability in atmospheric CH3Br mole fractions. We find that CH3Br mole fractions are strongly correlated with the El Nino Southern Oscillation (ENSO) phenomenon, but variability in winds, sea surface temperature, and biological production during ENSO are unlikely to drive the observed changes in atmospheric CH3Br directly. Rather, the results indicate that ENSO-driven changes to biomass burning are an important cause of the observed interannual CH3Br variability.

引用

页数：9