Do dust emissions from sparsely vegetated regions dominate atmospheric iron supply to the Southern Ocean?
Abstract: Atmospheric deposition of dust aerosols is a significant source of exogenous iron (Fe) in marine ecosystems and is critical in setting primary marine productivity during summer. This dust‐borne input of Fe is particularly important to the Southern Ocean, which is arguably the most biogeoch...
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ftcdlib:oai:escholarship.org:ark:/13030/qt8706j7mk 2024-01-14T10:10:48+01:00 Do dust emissions from sparsely vegetated regions dominate atmospheric iron supply to the Southern Ocean? Ito, Akinori Kok, Jasper F 3987 - 4002 2017-04-16 application/pdf https://escholarship.org/uc/item/8706j7mk unknown eScholarship, University of California qt8706j7mk https://escholarship.org/uc/item/8706j7mk public Journal of Geophysical Research: Atmospheres, vol 122, iss 7 Earth Sciences Oceanography Atmospheric Sciences Climate Action Life Below Water dust emission iron supply atmospheric chemistry transport model Southern Ocean Physical Geography and Environmental Geoscience Climate change science article 2017 ftcdlib 2023-12-18T19:08:34Z Abstract: Atmospheric deposition of dust aerosols is a significant source of exogenous iron (Fe) in marine ecosystems and is critical in setting primary marine productivity during summer. This dust‐borne input of Fe is particularly important to the Southern Ocean, which is arguably the most biogeochemically important ocean because of its large spatial extent and its considerable influence on the global carbon cycle. However, there is large uncertainty in estimates of dust emissions in the Southern Hemisphere and thus of the deposition of Fe‐containing aerosols onto oceans. Here we hypothesize that sparsely vegetated surfaces in arid and semiarid regions are important sources of Fe‐containing aerosols to the Southern Ocean. We test this hypothesis using an improved dust emission scheme in conjunction with satellite products of vegetation cover and soil moisture in an atmospheric chemistry transport model. Our improved model shows a twofold increase of Fe input into the Southern Ocean in austral summer with respect to spring and estimates that the Fe input is more than double that simulated using a conventional dust emission scheme in summer. Our model results suggest that dust emissions from open shrublands contribute over 90% of total Fe deposition into the Southern Ocean. These findings have important implications for the projection of the Southern Ocean's carbon uptake. Article in Journal/Newspaper Southern Ocean University of California: eScholarship Austral Southern Ocean |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Earth Sciences Oceanography Atmospheric Sciences Climate Action Life Below Water dust emission iron supply atmospheric chemistry transport model Southern Ocean Physical Geography and Environmental Geoscience Climate change science |
spellingShingle |
Earth Sciences Oceanography Atmospheric Sciences Climate Action Life Below Water dust emission iron supply atmospheric chemistry transport model Southern Ocean Physical Geography and Environmental Geoscience Climate change science Ito, Akinori Kok, Jasper F Do dust emissions from sparsely vegetated regions dominate atmospheric iron supply to the Southern Ocean? |
topic_facet |
Earth Sciences Oceanography Atmospheric Sciences Climate Action Life Below Water dust emission iron supply atmospheric chemistry transport model Southern Ocean Physical Geography and Environmental Geoscience Climate change science |
description |
Abstract: Atmospheric deposition of dust aerosols is a significant source of exogenous iron (Fe) in marine ecosystems and is critical in setting primary marine productivity during summer. This dust‐borne input of Fe is particularly important to the Southern Ocean, which is arguably the most biogeochemically important ocean because of its large spatial extent and its considerable influence on the global carbon cycle. However, there is large uncertainty in estimates of dust emissions in the Southern Hemisphere and thus of the deposition of Fe‐containing aerosols onto oceans. Here we hypothesize that sparsely vegetated surfaces in arid and semiarid regions are important sources of Fe‐containing aerosols to the Southern Ocean. We test this hypothesis using an improved dust emission scheme in conjunction with satellite products of vegetation cover and soil moisture in an atmospheric chemistry transport model. Our improved model shows a twofold increase of Fe input into the Southern Ocean in austral summer with respect to spring and estimates that the Fe input is more than double that simulated using a conventional dust emission scheme in summer. Our model results suggest that dust emissions from open shrublands contribute over 90% of total Fe deposition into the Southern Ocean. These findings have important implications for the projection of the Southern Ocean's carbon uptake. |
format |
Article in Journal/Newspaper |
author |
Ito, Akinori Kok, Jasper F |
author_facet |
Ito, Akinori Kok, Jasper F |
author_sort |
Ito, Akinori |
title |
Do dust emissions from sparsely vegetated regions dominate atmospheric iron supply to the Southern Ocean? |
title_short |
Do dust emissions from sparsely vegetated regions dominate atmospheric iron supply to the Southern Ocean? |
title_full |
Do dust emissions from sparsely vegetated regions dominate atmospheric iron supply to the Southern Ocean? |
title_fullStr |
Do dust emissions from sparsely vegetated regions dominate atmospheric iron supply to the Southern Ocean? |
title_full_unstemmed |
Do dust emissions from sparsely vegetated regions dominate atmospheric iron supply to the Southern Ocean? |
title_sort |
do dust emissions from sparsely vegetated regions dominate atmospheric iron supply to the southern ocean? |
publisher |
eScholarship, University of California |
publishDate |
2017 |
url |
https://escholarship.org/uc/item/8706j7mk |
op_coverage |
3987 - 4002 |
geographic |
Austral Southern Ocean |
geographic_facet |
Austral Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Journal of Geophysical Research: Atmospheres, vol 122, iss 7 |
op_relation |
qt8706j7mk https://escholarship.org/uc/item/8706j7mk |
op_rights |
public |
_version_ |
1788065613471547392 |