Deliverable 6.7 GHG budgets – atmosphere
This document describes the work conducted within the atmospheric component of INTAROS Task 6.5. The main contributions for the work reported herein were produced by partner MPG, with additional contributions from UB. The East Siberian Arctic Shelf hosts vast carbon reservoirs at risk of degradation...
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ftzenodo:oai:zenodo.org:7137651 2023-05-15T15:02:15+02:00 Deliverable 6.7 GHG budgets – atmosphere Goeckede, Mathias Reum, Friedemann Heygster, Georg 2021-10-28 https://zenodo.org/record/7137651 https://doi.org/10.5281/zenodo.7137651 eng eng info:eu-repo/grantAgreement/EC/H2020/727890/ doi:10.5281/zenodo.7137650 https://zenodo.org/communities/intaros-h2020 https://zenodo.org/record/7137651 https://doi.org/10.5281/zenodo.7137651 oai:zenodo.org:7137651 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode Arctic INTAROS East Siberian Shelf Atmosphere Observing Systems Carbon Methane Greenhouse Gas Inverse Model info:eu-repo/semantics/report publication-deliverable 2021 ftzenodo https://doi.org/10.5281/zenodo.713765110.5281/zenodo.7137650 2023-03-10T13:46:23Z This document describes the work conducted within the atmospheric component of INTAROS Task 6.5. The main contributions for the work reported herein were produced by partner MPG, with additional contributions from UB. The East Siberian Arctic Shelf hosts vast carbon reservoirs at risk of degradation and may be a strong emitter of methane to the atmosphere. Yet, estimates of its annual methane emissions and their key controls are highly uncertain. In the presented project, we estimated these emissions with a geostatistical inverse model from atmospheric observations over seventeen months in Tiksi (Russia), Barrow (Alaska) and Ambarchik (Russia). Our simulations yielded annual methane emissions of 0.3 – 1.5 Tg CH4, which is on the low end of previously reported estimates (0 – 17 Tg CH4 yr-1). Our geostatistical approach allows us to test the compatibility of a large number of spatiotemporal emissions patterns with the atmospheric signals. In this context, we specifically tested the suitability of novel data products from the INTAROS database to improve model performance. Our model attributes highest emissions to shallow waters and to ice-free and potentially freeze-up periods, but also finds substantial emissions during the ice-covered period. We do not detect substantial emissions of stored methane during ice breakup. Our results suggest that mixing and stratification of the water column and cracks in sea ice could be among the dominant controls of methane emissions from the shelf to the atmosphere. Other explanations are possible and discussed, including limitations of our study. The information provided by the INTAROS database led to minor improvements in the explained variability of atmospheric greenhouse gas time series, indicating the high quality of the novel products. However, since parameter selection basically replaced existing oceanic variables by better performing new ones for the same parameter but did not add a previously omitted parameter to the highest-ranking models, we could not gain novel ... Report Arctic Barrow Sea ice Tiksi Alaska Zenodo Arctic Tiksi ENVELOPE(128.867,128.867,71.633,71.633) East Siberian Shelf ENVELOPE(-162.267,-162.267,74.400,74.400) Ambarchik ENVELOPE(162.303,162.303,69.625,69.625) |
institution |
Open Polar |
collection |
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op_collection_id |
ftzenodo |
language |
English |
topic |
Arctic INTAROS East Siberian Shelf Atmosphere Observing Systems Carbon Methane Greenhouse Gas Inverse Model |
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Arctic INTAROS East Siberian Shelf Atmosphere Observing Systems Carbon Methane Greenhouse Gas Inverse Model Goeckede, Mathias Reum, Friedemann Heygster, Georg Deliverable 6.7 GHG budgets – atmosphere |
topic_facet |
Arctic INTAROS East Siberian Shelf Atmosphere Observing Systems Carbon Methane Greenhouse Gas Inverse Model |
description |
This document describes the work conducted within the atmospheric component of INTAROS Task 6.5. The main contributions for the work reported herein were produced by partner MPG, with additional contributions from UB. The East Siberian Arctic Shelf hosts vast carbon reservoirs at risk of degradation and may be a strong emitter of methane to the atmosphere. Yet, estimates of its annual methane emissions and their key controls are highly uncertain. In the presented project, we estimated these emissions with a geostatistical inverse model from atmospheric observations over seventeen months in Tiksi (Russia), Barrow (Alaska) and Ambarchik (Russia). Our simulations yielded annual methane emissions of 0.3 – 1.5 Tg CH4, which is on the low end of previously reported estimates (0 – 17 Tg CH4 yr-1). Our geostatistical approach allows us to test the compatibility of a large number of spatiotemporal emissions patterns with the atmospheric signals. In this context, we specifically tested the suitability of novel data products from the INTAROS database to improve model performance. Our model attributes highest emissions to shallow waters and to ice-free and potentially freeze-up periods, but also finds substantial emissions during the ice-covered period. We do not detect substantial emissions of stored methane during ice breakup. Our results suggest that mixing and stratification of the water column and cracks in sea ice could be among the dominant controls of methane emissions from the shelf to the atmosphere. Other explanations are possible and discussed, including limitations of our study. The information provided by the INTAROS database led to minor improvements in the explained variability of atmospheric greenhouse gas time series, indicating the high quality of the novel products. However, since parameter selection basically replaced existing oceanic variables by better performing new ones for the same parameter but did not add a previously omitted parameter to the highest-ranking models, we could not gain novel ... |
format |
Report |
author |
Goeckede, Mathias Reum, Friedemann Heygster, Georg |
author_facet |
Goeckede, Mathias Reum, Friedemann Heygster, Georg |
author_sort |
Goeckede, Mathias |
title |
Deliverable 6.7 GHG budgets – atmosphere |
title_short |
Deliverable 6.7 GHG budgets – atmosphere |
title_full |
Deliverable 6.7 GHG budgets – atmosphere |
title_fullStr |
Deliverable 6.7 GHG budgets – atmosphere |
title_full_unstemmed |
Deliverable 6.7 GHG budgets – atmosphere |
title_sort |
deliverable 6.7 ghg budgets – atmosphere |
publishDate |
2021 |
url |
https://zenodo.org/record/7137651 https://doi.org/10.5281/zenodo.7137651 |
long_lat |
ENVELOPE(128.867,128.867,71.633,71.633) ENVELOPE(-162.267,-162.267,74.400,74.400) ENVELOPE(162.303,162.303,69.625,69.625) |
geographic |
Arctic Tiksi East Siberian Shelf Ambarchik |
geographic_facet |
Arctic Tiksi East Siberian Shelf Ambarchik |
genre |
Arctic Barrow Sea ice Tiksi Alaska |
genre_facet |
Arctic Barrow Sea ice Tiksi Alaska |
op_relation |
info:eu-repo/grantAgreement/EC/H2020/727890/ doi:10.5281/zenodo.7137650 https://zenodo.org/communities/intaros-h2020 https://zenodo.org/record/7137651 https://doi.org/10.5281/zenodo.7137651 oai:zenodo.org:7137651 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.713765110.5281/zenodo.7137650 |
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1766334225381851136 |