Magnitude and seasonality of wetland methane emissions from the Hudson Bay Lowlands (Canada)
The Hudson Bay Lowlands (HBL) is the second largest boreal wetland ecosystem in the world and an important natural source of global atmospheric methane. We quantify the HBL methane emissions by using the GEOS-Chem chemical transport model to simulate aircraft measurements over the HBL from the ARCTA...
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2011
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ftinfoscience:oai:infoscience.tind.io:168495 2023-06-11T04:09:32+02:00 Magnitude and seasonality of wetland methane emissions from the Hudson Bay Lowlands (Canada) Pickett-Heaps, C. A. Jacob, D. J. Wecht, K. J. Kort, E. A. Wofsy, S. C. Diskin, G. S. Worthy, D. E. J. Kaplan, Jed Oliver Bey, I. Drevet, J. 2011-08-30T17:26:38Z http://infoscience.epfl.ch/record/168495 https://doi.org/10.5194/acp-11-3773-2011 https://infoscience.epfl.ch/record/168495/files/11-3773-2011-acp-11-3773-2011.pdf unknown Copernicus Publications http://infoscience.epfl.ch/record/168495 doi:10.5194/acp-11-3773-2011 ISI:000290014300014 https://infoscience.epfl.ch/record/168495/files/11-3773-2011-acp-11-3773-2011.pdf http://infoscience.epfl.ch/record/168495 Text 2011 ftinfoscience https://doi.org/10.5194/acp-11-3773-2011 2023-05-08T00:45:07Z The Hudson Bay Lowlands (HBL) is the second largest boreal wetland ecosystem in the world and an important natural source of global atmospheric methane. We quantify the HBL methane emissions by using the GEOS-Chem chemical transport model to simulate aircraft measurements over the HBL from the ARCTAS and pre-HIPPO campaigns in May-July 2008, together with continuous 2004-2008 surface observations at Fraserdale (southern edge of HBL) and Alert (Arctic background). The difference in methane concentrations between Fraserdale and Alert is shown to be a good indicator of HBL emissions, and implies a sharp seasonal onset of emissions in late May (consistent with the aircraft data), a peak in July-August, and a seasonal shut-off in September. The model, in which seasonal variation of emission is mainly driven by surface temperature, reproduces well the observations in summer but its seasonal shoulders are too broad. We suggest that this reflects the suppression of emissions by snow cover and greatly improve the model simulation by accounting for this effect. Our resulting best estimate for HBL methane emissions is 2.3 Tga(-1), several-fold higher than previous estimates (Roulet et al., 1994; Worthy et al., 2000). Text Arctic Hudson Bay EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) Arctic Hudson Bay Canada Hudson Atmospheric Chemistry and Physics 11 8 3773 3779 |
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EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) |
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ftinfoscience |
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description |
The Hudson Bay Lowlands (HBL) is the second largest boreal wetland ecosystem in the world and an important natural source of global atmospheric methane. We quantify the HBL methane emissions by using the GEOS-Chem chemical transport model to simulate aircraft measurements over the HBL from the ARCTAS and pre-HIPPO campaigns in May-July 2008, together with continuous 2004-2008 surface observations at Fraserdale (southern edge of HBL) and Alert (Arctic background). The difference in methane concentrations between Fraserdale and Alert is shown to be a good indicator of HBL emissions, and implies a sharp seasonal onset of emissions in late May (consistent with the aircraft data), a peak in July-August, and a seasonal shut-off in September. The model, in which seasonal variation of emission is mainly driven by surface temperature, reproduces well the observations in summer but its seasonal shoulders are too broad. We suggest that this reflects the suppression of emissions by snow cover and greatly improve the model simulation by accounting for this effect. Our resulting best estimate for HBL methane emissions is 2.3 Tga(-1), several-fold higher than previous estimates (Roulet et al., 1994; Worthy et al., 2000). |
format |
Text |
author |
Pickett-Heaps, C. A. Jacob, D. J. Wecht, K. J. Kort, E. A. Wofsy, S. C. Diskin, G. S. Worthy, D. E. J. Kaplan, Jed Oliver Bey, I. Drevet, J. |
spellingShingle |
Pickett-Heaps, C. A. Jacob, D. J. Wecht, K. J. Kort, E. A. Wofsy, S. C. Diskin, G. S. Worthy, D. E. J. Kaplan, Jed Oliver Bey, I. Drevet, J. Magnitude and seasonality of wetland methane emissions from the Hudson Bay Lowlands (Canada) |
author_facet |
Pickett-Heaps, C. A. Jacob, D. J. Wecht, K. J. Kort, E. A. Wofsy, S. C. Diskin, G. S. Worthy, D. E. J. Kaplan, Jed Oliver Bey, I. Drevet, J. |
author_sort |
Pickett-Heaps, C. A. |
title |
Magnitude and seasonality of wetland methane emissions from the Hudson Bay Lowlands (Canada) |
title_short |
Magnitude and seasonality of wetland methane emissions from the Hudson Bay Lowlands (Canada) |
title_full |
Magnitude and seasonality of wetland methane emissions from the Hudson Bay Lowlands (Canada) |
title_fullStr |
Magnitude and seasonality of wetland methane emissions from the Hudson Bay Lowlands (Canada) |
title_full_unstemmed |
Magnitude and seasonality of wetland methane emissions from the Hudson Bay Lowlands (Canada) |
title_sort |
magnitude and seasonality of wetland methane emissions from the hudson bay lowlands (canada) |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
http://infoscience.epfl.ch/record/168495 https://doi.org/10.5194/acp-11-3773-2011 https://infoscience.epfl.ch/record/168495/files/11-3773-2011-acp-11-3773-2011.pdf |
geographic |
Arctic Hudson Bay Canada Hudson |
geographic_facet |
Arctic Hudson Bay Canada Hudson |
genre |
Arctic Hudson Bay |
genre_facet |
Arctic Hudson Bay |
op_source |
http://infoscience.epfl.ch/record/168495 |
op_relation |
http://infoscience.epfl.ch/record/168495 doi:10.5194/acp-11-3773-2011 ISI:000290014300014 https://infoscience.epfl.ch/record/168495/files/11-3773-2011-acp-11-3773-2011.pdf |
op_doi |
https://doi.org/10.5194/acp-11-3773-2011 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
11 |
container_issue |
8 |
container_start_page |
3773 |
op_container_end_page |
3779 |
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1768383476052000768 |