Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-14787-2018 |
Surface fluxes of bromoform and dibromomethane over the tropical western Pacific inferred from airborne in situ measurements | |
Feng, Liang1,2; Palmer, Paul I.1,2; Butler, Robyn2; Andrews, Stephen J.3; Atlas, Elliot L.4; Carpenter, Lucy J.3; Donets, Valeria4; Harris, Neil R. P.5; Salawitch, Ross J.6; Pan, Laura L.7; Schauffler, Sue M.7 | |
2018-10-15 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:20页码:14787-14798 |
文章类型 | Article |
语种 | 英语 |
国家 | Scotland; England; USA |
英文摘要 | We infer surface fluxes of bromoform (CHBr3) and dibromoform (CH2Br2) from aircraft observations over the western Pacific using a tagged version of the GEOS-Chem global 3-D atmospheric chemistry model and a maximum a posteriori inverse model. Using GEOS-Chem (GC) as an intermediary, we find that the distribution of a priori ocean emissions of these gases are reasonably consistent with observed atmospheric mole fractions of CHBr3 (r = 0.62) and CH2Br2 (r = 0.38). These a priori emissions result in a positive model bias in CHBr3 peaking in the marine boundary layer, but reproduce observed values of CH2Br2 with no significant bias by virtue of its longer atmospheric lifetime. Using GEOS-Chem, we find that observed variations in atmospheric CHBr3 are determined equally by sources over the western Pacific and those outside the study region, but observed variations in CH2Br2 are determined mainly by sources outside the western Pacific. Numerical closed-loop experiments show that the spatial and temporal distribution of boundary layer aircraft data have the potential to substantially improve current knowledge of these fluxes, with improvements related to data density. Using the aircraft data, we estimate aggregated regional fluxes of 3.6 +/- 0.3 x 10(8) and 0.7 +/- 0 : 1 x 10(8) g month 1 for CHBr3 and CH2Br2 over 130-155 ffi E and 0-12 ffi N, respectively, which represent reductions of 20 %-40% of the prior inventories by Ordonez et al. (2012) and substantial spatial deviations from differ-ent a priori inventories. We find no evidence to support a robust linear relationship between CHBr3 and CH2Br2 oceanic emissions, as used by previous studies. We find that over regions with dense observation coverage, our choice of a priori inventory does not significantly impact our reported a posteriori flux estimates. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000447403100002 |
WOS关键词 | SHORT-LIVED SUBSTANCES ; EMISSION LOCATION ; ATLANTIC-OCEAN ; METHYL-IODIDE ; BROMINE ; OZONE ; TRANSPORT ; MACROALGAE ; VSLS ; STRATOSPHERE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/21689 |
专题 | 地球科学 |
作者单位 | 1.Univ Edinburgh, Natl Ctr Earth Observat, Edinburgh, Midlothian, Scotland; 2.Univ Edinburgh, Sch GeoSci, Edinburgh, Midlothian, Scotland; 3.Univ York, Dept Chem, Wolfson Atmospher Chem Labs, York, N Yorkshire, England; 4.Univ Miami, Dept Atmospher Sci, Miami, FL USA; 5.Cranfield Univ, Ctr Atmospher Informat & Emiss Technol, Cranfield, Beds, England; 6.Univ Maryland, Dept Atmospher & Ocean Sci, College Pk, MD 20742 USA; 7.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA |
推荐引用方式 GB/T 7714 | Feng, Liang,Palmer, Paul I.,Butler, Robyn,et al. Surface fluxes of bromoform and dibromomethane over the tropical western Pacific inferred from airborne in situ measurements[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(20):14787-14798. |
APA | Feng, Liang.,Palmer, Paul I..,Butler, Robyn.,Andrews, Stephen J..,Atlas, Elliot L..,...&Schauffler, Sue M..(2018).Surface fluxes of bromoform and dibromomethane over the tropical western Pacific inferred from airborne in situ measurements.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(20),14787-14798. |
MLA | Feng, Liang,et al."Surface fluxes of bromoform and dibromomethane over the tropical western Pacific inferred from airborne in situ measurements".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.20(2018):14787-14798. |
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