Novel approaches to improve estimates of short-lived halocarbon emissions during summer from the Southern Ocean using airborne observations

摘要: Abstract. Fluxes of halogenated volatile organic compounds (VOCs) over the Southern Ocean remain poorly understood, and few atmospheric measurements exist to constrain modeled emissions these compounds. We present observations of CHBr3 , CH2Br2 CH3I CHClBr2 CHBrCl2 and CH3Br during O2∕N2 Ratio CO2 Airborne (ORCAS) study second Atmospheric Tomography mission (ATom-2) in January February 2016 2017. Good model–measurement correlations were obtained between simulations from the Community Earth System Model (CESM) component with chemistry (CAM-Chem) for but all showed significant differences model : measurement ratios. The model : measurement comparison was satisfactory for low levels precluded us from making a complete assessment. Thereafter, we demonstrate two novel approaches to estimate halogenated VOC fluxes; first approach takes advantage robust relationships that found airborne O2 . use linear regressions distributions infer a biological flux VOCs. The uses Stochastic Time-Inverted Lagrangian Transport (STILT) particle dispersion model to explore relationships observed mixing ratios product of the upstream surface influence sea ice, chl  absorption due to detritus, downward shortwave radiation at surface, which turn relate various regional hypothesized sources VOCs such as marine phytoplankton, phytoplankton sea-ice brines, decomposing organic matter seawater. These can help evaluate the likelihood particular case of statistically correlations, as may be used derive an estimated field. Our results are consistent a biogenic source both nonbiological and biological regions.