Patterns of CO2 and radiocarbon across high northern latitudes during International Polar Year 2008
High-resolution in situ CO2 measurements were conducted aboard the NASA DC-8 aircraft during the ARCTAS/POLARCAT field campaign, a component of the wider 2007-2008 International Polar Year activities. Data were recorded during large-scale surveys spanning the North American sub-Arctic to the North P...
Main Authors: | , , , , , , , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
eScholarship, University of California
2011
|
Subjects: | |
Online Access: | https://escholarship.org/uc/item/3x1481gc |
id |
ftcdlib:oai:escholarship.org:ark:/13030/qt3x1481gc |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:oai:escholarship.org:ark:/13030/qt3x1481gc 2023-10-25T01:36:17+02:00 Patterns of CO2 and radiocarbon across high northern latitudes during International Polar Year 2008 Vay, SA Choi, Y Vadrevu, KP Blake, DR Tyler, SC Wisthaler, A Hecobian, A Kondo, Y Diskin, GS Sachse, GW Woo, J‐H Weinheimer, AJ Burkhart, JF Stohl, A Wennberg, PO 2011-01-01 application/pdf https://escholarship.org/uc/item/3x1481gc unknown eScholarship, University of California qt3x1481gc https://escholarship.org/uc/item/3x1481gc CC-BY Journal of Geophysical Research, vol 116, iss D14 Earth Sciences Atmospheric Sciences Climate Action Meteorology & Atmospheric Sciences article 2011 ftcdlib 2023-09-25T18:03:35Z High-resolution in situ CO2 measurements were conducted aboard the NASA DC-8 aircraft during the ARCTAS/POLARCAT field campaign, a component of the wider 2007-2008 International Polar Year activities. Data were recorded during large-scale surveys spanning the North American sub-Arctic to the North Pole from 0.04 to 12 km altitude in spring and summer of 2008. Influences on the observed CO2 concentrations were investigated using coincident CO, black carbon, CH3CN, HCN, O3, C2Cl4, and Δ14CO2 data, and the FLEXPART model. In spring, the CO2 spatial distribution from 55̊N to 90̊N was largely determined by the long-range transport of air masses laden with Asian anthropogenic pollution intermingled with Eurasian fire emissions evidenced by the greater variability in the mid-to-upper troposphere. At the receptor site, the enhancement ratios of CO2 to CO in pollution plumes ranged from 27 to 80 ppmv ppmv-1 with the highest anthropogenic content registered in plumes sampled poleward of 80̊N. In summer, the CO2 signal largely reflected emissions from lightning-ignited wildfires within the boreal forests of northern Saskatchewan juxtaposed with uptake by the terrestrial biosphere. Measurements within fresh fire plumes yielded CO2 to CO emission ratios of 4 to 16 ppmv ppmv-1 and a mean CO2 emission factor of 1698 ± 280 g kg-1 dry matter. From the 14C in CO2 content of 48 whole air samples, mean spring (46.6 ± 4.4%) and summer (51.5 ± 5%) D14CO2 values indicate a 5%seasonal difference. Although the northern midlatitudes were identified as the emissions source regions for the majority of the spring samples, depleted Δ14CO2 values were observed in <1% of the data set. Rather, ARCTAS Δ14CO2 observations (54%) revealed predominately a pattern of positive disequilibrium (1-7%) with respect to background regardless of season owing to both heterotrophic respiration and fire-induced combustion of biomass. Anomalously enriched Δ14CO2 values (101-262%) measured in emissions from Lake Athabasca and Eurasian fires speak to biomass ... Article in Journal/Newspaper Arctic black carbon International Polar Year Lake Athabasca North Pole University of California: eScholarship Arctic North Pole |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Earth Sciences Atmospheric Sciences Climate Action Meteorology & Atmospheric Sciences |
spellingShingle |
Earth Sciences Atmospheric Sciences Climate Action Meteorology & Atmospheric Sciences Vay, SA Choi, Y Vadrevu, KP Blake, DR Tyler, SC Wisthaler, A Hecobian, A Kondo, Y Diskin, GS Sachse, GW Woo, J‐H Weinheimer, AJ Burkhart, JF Stohl, A Wennberg, PO Patterns of CO2 and radiocarbon across high northern latitudes during International Polar Year 2008 |
topic_facet |
Earth Sciences Atmospheric Sciences Climate Action Meteorology & Atmospheric Sciences |
description |
High-resolution in situ CO2 measurements were conducted aboard the NASA DC-8 aircraft during the ARCTAS/POLARCAT field campaign, a component of the wider 2007-2008 International Polar Year activities. Data were recorded during large-scale surveys spanning the North American sub-Arctic to the North Pole from 0.04 to 12 km altitude in spring and summer of 2008. Influences on the observed CO2 concentrations were investigated using coincident CO, black carbon, CH3CN, HCN, O3, C2Cl4, and Δ14CO2 data, and the FLEXPART model. In spring, the CO2 spatial distribution from 55̊N to 90̊N was largely determined by the long-range transport of air masses laden with Asian anthropogenic pollution intermingled with Eurasian fire emissions evidenced by the greater variability in the mid-to-upper troposphere. At the receptor site, the enhancement ratios of CO2 to CO in pollution plumes ranged from 27 to 80 ppmv ppmv-1 with the highest anthropogenic content registered in plumes sampled poleward of 80̊N. In summer, the CO2 signal largely reflected emissions from lightning-ignited wildfires within the boreal forests of northern Saskatchewan juxtaposed with uptake by the terrestrial biosphere. Measurements within fresh fire plumes yielded CO2 to CO emission ratios of 4 to 16 ppmv ppmv-1 and a mean CO2 emission factor of 1698 ± 280 g kg-1 dry matter. From the 14C in CO2 content of 48 whole air samples, mean spring (46.6 ± 4.4%) and summer (51.5 ± 5%) D14CO2 values indicate a 5%seasonal difference. Although the northern midlatitudes were identified as the emissions source regions for the majority of the spring samples, depleted Δ14CO2 values were observed in <1% of the data set. Rather, ARCTAS Δ14CO2 observations (54%) revealed predominately a pattern of positive disequilibrium (1-7%) with respect to background regardless of season owing to both heterotrophic respiration and fire-induced combustion of biomass. Anomalously enriched Δ14CO2 values (101-262%) measured in emissions from Lake Athabasca and Eurasian fires speak to biomass ... |
format |
Article in Journal/Newspaper |
author |
Vay, SA Choi, Y Vadrevu, KP Blake, DR Tyler, SC Wisthaler, A Hecobian, A Kondo, Y Diskin, GS Sachse, GW Woo, J‐H Weinheimer, AJ Burkhart, JF Stohl, A Wennberg, PO |
author_facet |
Vay, SA Choi, Y Vadrevu, KP Blake, DR Tyler, SC Wisthaler, A Hecobian, A Kondo, Y Diskin, GS Sachse, GW Woo, J‐H Weinheimer, AJ Burkhart, JF Stohl, A Wennberg, PO |
author_sort |
Vay, SA |
title |
Patterns of CO2 and radiocarbon across high northern latitudes during International Polar Year 2008 |
title_short |
Patterns of CO2 and radiocarbon across high northern latitudes during International Polar Year 2008 |
title_full |
Patterns of CO2 and radiocarbon across high northern latitudes during International Polar Year 2008 |
title_fullStr |
Patterns of CO2 and radiocarbon across high northern latitudes during International Polar Year 2008 |
title_full_unstemmed |
Patterns of CO2 and radiocarbon across high northern latitudes during International Polar Year 2008 |
title_sort |
patterns of co2 and radiocarbon across high northern latitudes during international polar year 2008 |
publisher |
eScholarship, University of California |
publishDate |
2011 |
url |
https://escholarship.org/uc/item/3x1481gc |
geographic |
Arctic North Pole |
geographic_facet |
Arctic North Pole |
genre |
Arctic black carbon International Polar Year Lake Athabasca North Pole |
genre_facet |
Arctic black carbon International Polar Year Lake Athabasca North Pole |
op_source |
Journal of Geophysical Research, vol 116, iss D14 |
op_relation |
qt3x1481gc https://escholarship.org/uc/item/3x1481gc |
op_rights |
CC-BY |
_version_ |
1780731264220790784 |