Continental outflow from the US to the upper troposphere over the North Atlantic during the NASA INTEX-NA Airborne Campaign
A case of continental outflow from the United States (US) was examined using airborne measurements from NASA DC-8 flight 13 during the Intercontinental Chemical Transport Experiment – North America (INTEX-NA). Mixing ratios of methane (CH 4 ) and carbon monoxide (CO) at 8–11 km altitude over the Nor...
Main Authors: | , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2008
|
Subjects: | |
Online Access: | https://doaj.org/article/0faf3c06b8d445a299c469c9d4874844 |
id |
ftdoajarticles:oai:doaj.org/article:0faf3c06b8d445a299c469c9d4874844 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:0faf3c06b8d445a299c469c9d4874844 2023-05-15T17:27:50+02:00 Continental outflow from the US to the upper troposphere over the North Atlantic during the NASA INTEX-NA Airborne Campaign S. Y. Kim R. Talbot H. Mao D. Blake S. Vay H. Fuelberg 2008-04-01T00:00:00Z https://doaj.org/article/0faf3c06b8d445a299c469c9d4874844 EN eng Copernicus Publications http://www.atmos-chem-phys.net/8/1989/2008/acp-8-1989-2008.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/0faf3c06b8d445a299c469c9d4874844 Atmospheric Chemistry and Physics, Vol 8, Iss 7, Pp 1989-2005 (2008) Physics QC1-999 Chemistry QD1-999 article 2008 ftdoajarticles 2022-12-31T00:26:12Z A case of continental outflow from the United States (US) was examined using airborne measurements from NASA DC-8 flight 13 during the Intercontinental Chemical Transport Experiment – North America (INTEX-NA). Mixing ratios of methane (CH 4 ) and carbon monoxide (CO) at 8–11 km altitude over the North Atlantic were elevated to 1843 ppbv and 134 ppbv respectively, while those of carbon dioxide (CO 2 ) and carbonyl sulfide (COS) were reduced to 372.4 ppmv and 411 pptv respectively. In this region, urban and industrial influences were evidenced by elevated mixing ratios and good linear relationships between urban and industrial tracers compared to North Atlantic background air. Moreover, low mixing ratios and a good correlation between COS and CO 2 showed a fingerprint of terrestrial uptake and minimal dilution during rapid transport over a 1–2 day time period. Analysis of synoptic conditions, backward trajectories, and photochemical aging estimates based on C 3 H 8 /C 2 H 6 strongly suggested that elevated anthropogenic tracers in the upper troposphere of the flight region were the result of transport via convection and warm conveyor belt (WCB) uplifting of boundary layer air over the southeastern US. This mechanism is supported by the similar slope values of linear correlations between long-lived (months) anthropogenic tracers (e.g., C 2 Cl 4 and CHCl 3 ) from the flight region and the planetary boundary layer in the southeastern US. In addition, the aircraft measurements suggest that outflow from the US augmented the entire tropospheric column at mid-latitudes over the North Atlantic. Overall, the flight 13 data demonstrate a pervasive impact of US anthropogenic emissions on the troposphere over the North Atlantic. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 S. Y. Kim R. Talbot H. Mao D. Blake S. Vay H. Fuelberg Continental outflow from the US to the upper troposphere over the North Atlantic during the NASA INTEX-NA Airborne Campaign |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
A case of continental outflow from the United States (US) was examined using airborne measurements from NASA DC-8 flight 13 during the Intercontinental Chemical Transport Experiment – North America (INTEX-NA). Mixing ratios of methane (CH 4 ) and carbon monoxide (CO) at 8–11 km altitude over the North Atlantic were elevated to 1843 ppbv and 134 ppbv respectively, while those of carbon dioxide (CO 2 ) and carbonyl sulfide (COS) were reduced to 372.4 ppmv and 411 pptv respectively. In this region, urban and industrial influences were evidenced by elevated mixing ratios and good linear relationships between urban and industrial tracers compared to North Atlantic background air. Moreover, low mixing ratios and a good correlation between COS and CO 2 showed a fingerprint of terrestrial uptake and minimal dilution during rapid transport over a 1–2 day time period. Analysis of synoptic conditions, backward trajectories, and photochemical aging estimates based on C 3 H 8 /C 2 H 6 strongly suggested that elevated anthropogenic tracers in the upper troposphere of the flight region were the result of transport via convection and warm conveyor belt (WCB) uplifting of boundary layer air over the southeastern US. This mechanism is supported by the similar slope values of linear correlations between long-lived (months) anthropogenic tracers (e.g., C 2 Cl 4 and CHCl 3 ) from the flight region and the planetary boundary layer in the southeastern US. In addition, the aircraft measurements suggest that outflow from the US augmented the entire tropospheric column at mid-latitudes over the North Atlantic. Overall, the flight 13 data demonstrate a pervasive impact of US anthropogenic emissions on the troposphere over the North Atlantic. |
format |
Article in Journal/Newspaper |
author |
S. Y. Kim R. Talbot H. Mao D. Blake S. Vay H. Fuelberg |
author_facet |
S. Y. Kim R. Talbot H. Mao D. Blake S. Vay H. Fuelberg |
author_sort |
S. Y. Kim |
title |
Continental outflow from the US to the upper troposphere over the North Atlantic during the NASA INTEX-NA Airborne Campaign |
title_short |
Continental outflow from the US to the upper troposphere over the North Atlantic during the NASA INTEX-NA Airborne Campaign |
title_full |
Continental outflow from the US to the upper troposphere over the North Atlantic during the NASA INTEX-NA Airborne Campaign |
title_fullStr |
Continental outflow from the US to the upper troposphere over the North Atlantic during the NASA INTEX-NA Airborne Campaign |
title_full_unstemmed |
Continental outflow from the US to the upper troposphere over the North Atlantic during the NASA INTEX-NA Airborne Campaign |
title_sort |
continental outflow from the us to the upper troposphere over the north atlantic during the nasa intex-na airborne campaign |
publisher |
Copernicus Publications |
publishDate |
2008 |
url |
https://doaj.org/article/0faf3c06b8d445a299c469c9d4874844 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmospheric Chemistry and Physics, Vol 8, Iss 7, Pp 1989-2005 (2008) |
op_relation |
http://www.atmos-chem-phys.net/8/1989/2008/acp-8-1989-2008.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/0faf3c06b8d445a299c469c9d4874844 |
_version_ |
1766120157405511680 |