Spatial and temporal variability of iodine in aerosol
In this work, we describe the compilation and homogenization of an extensive data set of aerosol iodine field observations in the period between 1963 and 2018 and we discuss its spatial and temporal dependences by comparison with CAM-Chem model simulations. A close to linear relationship between sol...
Published in: | Journal of Geophysical Research: Atmospheres |
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:79876 2023-05-15T14:04:01+02:00 Spatial and temporal variability of iodine in aerosol Gómez Martín, Juan C. Saiz-Lopez, Alfonso Cuevas, Carlos A. Fernandez, Rafael P. Gilfedder, Benjamin Weller, Rolf Baker, Alex R. Droste, Elise Lai, Senchao 2021-05-16 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/79876/ https://ueaeprints.uea.ac.uk/id/eprint/79876/1/896463_2_merged_1617613636_small.pdf https://ueaeprints.uea.ac.uk/id/eprint/79876/7/Published_Version.pdf https://doi.org/10.1029/2020JD034410 en eng https://ueaeprints.uea.ac.uk/id/eprint/79876/1/896463_2_merged_1617613636_small.pdf https://ueaeprints.uea.ac.uk/id/eprint/79876/7/Published_Version.pdf Gómez Martín, Juan C., Saiz-Lopez, Alfonso, Cuevas, Carlos A., Fernandez, Rafael P., Gilfedder, Benjamin, Weller, Rolf, Baker, Alex R., Droste, Elise and Lai, Senchao (2021) Spatial and temporal variability of iodine in aerosol. Journal of Geophysical Research: Atmospheres, 126 (9). ISSN 2169-897X doi:10.1029/2020JD034410 cc_by_nc CC-BY-NC Article PeerReviewed 2021 ftuniveastangl https://doi.org/10.1029/2020JD034410 2023-01-30T21:54:54Z In this work, we describe the compilation and homogenization of an extensive data set of aerosol iodine field observations in the period between 1963 and 2018 and we discuss its spatial and temporal dependences by comparison with CAM-Chem model simulations. A close to linear relationship between soluble and total iodine in aerosol is found (∼80% aerosol iodine is soluble), which enables converting a large subset of measurements of soluble iodine into total iodine. The resulting data set shows a distinct latitudinal dependence, with an enhancement toward the Northern Hemisphere (NH) tropics and lower values toward the poles. This behavior, which has been predicted by atmospheric models to depend on the global distribution of the main oceanic iodine source (which in turn depends on the reaction of ozone with aqueous iodide on the sea water-air interface, generating gas-phase I 2 and HOI), is confirmed here by field observations for the first time. Longitudinally, there is some indication of a wave-one profile in the tropics, which peaks in the Atlantic and shows a minimum in the Pacific. New data from Antarctica show that the south polar seasonal variation of iodine in aerosol mirrors that observed previously in the Arctic, with two equinoctial maxima and the dominant maximum occurring in spring. While no clear seasonal variability is observed in NH middle latitudes, there is an indication of different seasonal cycles in the NH tropical Atlantic and Pacific. Long-term trends cannot be unambiguously established as a result of inhomogeneous time and spatial coverage and analytical methods. Article in Journal/Newspaper Antarc* Antarctica Arctic University of East Anglia: UEA Digital Repository Arctic Pacific Journal of Geophysical Research: Atmospheres 126 9 |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
English |
description |
In this work, we describe the compilation and homogenization of an extensive data set of aerosol iodine field observations in the period between 1963 and 2018 and we discuss its spatial and temporal dependences by comparison with CAM-Chem model simulations. A close to linear relationship between soluble and total iodine in aerosol is found (∼80% aerosol iodine is soluble), which enables converting a large subset of measurements of soluble iodine into total iodine. The resulting data set shows a distinct latitudinal dependence, with an enhancement toward the Northern Hemisphere (NH) tropics and lower values toward the poles. This behavior, which has been predicted by atmospheric models to depend on the global distribution of the main oceanic iodine source (which in turn depends on the reaction of ozone with aqueous iodide on the sea water-air interface, generating gas-phase I 2 and HOI), is confirmed here by field observations for the first time. Longitudinally, there is some indication of a wave-one profile in the tropics, which peaks in the Atlantic and shows a minimum in the Pacific. New data from Antarctica show that the south polar seasonal variation of iodine in aerosol mirrors that observed previously in the Arctic, with two equinoctial maxima and the dominant maximum occurring in spring. While no clear seasonal variability is observed in NH middle latitudes, there is an indication of different seasonal cycles in the NH tropical Atlantic and Pacific. Long-term trends cannot be unambiguously established as a result of inhomogeneous time and spatial coverage and analytical methods. |
format |
Article in Journal/Newspaper |
author |
Gómez Martín, Juan C. Saiz-Lopez, Alfonso Cuevas, Carlos A. Fernandez, Rafael P. Gilfedder, Benjamin Weller, Rolf Baker, Alex R. Droste, Elise Lai, Senchao |
spellingShingle |
Gómez Martín, Juan C. Saiz-Lopez, Alfonso Cuevas, Carlos A. Fernandez, Rafael P. Gilfedder, Benjamin Weller, Rolf Baker, Alex R. Droste, Elise Lai, Senchao Spatial and temporal variability of iodine in aerosol |
author_facet |
Gómez Martín, Juan C. Saiz-Lopez, Alfonso Cuevas, Carlos A. Fernandez, Rafael P. Gilfedder, Benjamin Weller, Rolf Baker, Alex R. Droste, Elise Lai, Senchao |
author_sort |
Gómez Martín, Juan C. |
title |
Spatial and temporal variability of iodine in aerosol |
title_short |
Spatial and temporal variability of iodine in aerosol |
title_full |
Spatial and temporal variability of iodine in aerosol |
title_fullStr |
Spatial and temporal variability of iodine in aerosol |
title_full_unstemmed |
Spatial and temporal variability of iodine in aerosol |
title_sort |
spatial and temporal variability of iodine in aerosol |
publishDate |
2021 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/79876/ https://ueaeprints.uea.ac.uk/id/eprint/79876/1/896463_2_merged_1617613636_small.pdf https://ueaeprints.uea.ac.uk/id/eprint/79876/7/Published_Version.pdf https://doi.org/10.1029/2020JD034410 |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Antarc* Antarctica Arctic |
genre_facet |
Antarc* Antarctica Arctic |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/79876/1/896463_2_merged_1617613636_small.pdf https://ueaeprints.uea.ac.uk/id/eprint/79876/7/Published_Version.pdf Gómez Martín, Juan C., Saiz-Lopez, Alfonso, Cuevas, Carlos A., Fernandez, Rafael P., Gilfedder, Benjamin, Weller, Rolf, Baker, Alex R., Droste, Elise and Lai, Senchao (2021) Spatial and temporal variability of iodine in aerosol. Journal of Geophysical Research: Atmospheres, 126 (9). ISSN 2169-897X doi:10.1029/2020JD034410 |
op_rights |
cc_by_nc |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1029/2020JD034410 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
126 |
container_issue |
9 |
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1766274963333971968 |