Observations of dissolved iron concentrations in the World Ocean: implications and constraints for ocean biogeochemical models
International audience Analysis of a global compilation of dissolved iron observations provides insights into the controlling processes for iron distributions and some constraints for ocean biogeochemical models. The distribution of dissolved iron is consistent with the conceptual model developed fo...
Main Authors: | , |
---|---|
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2007
|
Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-00297886 https://hal.archives-ouvertes.fr/hal-00297886/document https://hal.archives-ouvertes.fr/hal-00297886/file/bgd-4-1241-2007.pdf |
id |
ftunivnantes:oai:HAL:hal-00297886v1 |
---|---|
record_format |
openpolar |
spelling |
ftunivnantes:oai:HAL:hal-00297886v1 2023-05-15T17:36:36+02:00 Observations of dissolved iron concentrations in the World Ocean: implications and constraints for ocean biogeochemical models Moore, J. K. Braucher, O. Department of Earth System Science Irvine (ESS) University of California Irvine (UC Irvine) University of California (UC)-University of California (UC) 2007-04-25 https://hal.archives-ouvertes.fr/hal-00297886 https://hal.archives-ouvertes.fr/hal-00297886/document https://hal.archives-ouvertes.fr/hal-00297886/file/bgd-4-1241-2007.pdf en eng HAL CCSD European Geosciences Union hal-00297886 https://hal.archives-ouvertes.fr/hal-00297886 https://hal.archives-ouvertes.fr/hal-00297886/document https://hal.archives-ouvertes.fr/hal-00297886/file/bgd-4-1241-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.archives-ouvertes.fr/hal-00297886 Biogeosciences Discussions, 2007, 4 (2), pp.1241-1277 [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2007 ftunivnantes 2022-11-30T00:59:48Z International audience Analysis of a global compilation of dissolved iron observations provides insights into the controlling processes for iron distributions and some constraints for ocean biogeochemical models. The distribution of dissolved iron is consistent with the conceptual model developed for the scavenging of Th isotopes, whereby particle scavenging is a two-step process of scavenging mainly by colloidal and small particulates followed by aggregation and removal on larger sinking particles. Much of the dissolved iron (<0.4 ?m) is present as small colloids (>~0.02 ?m) and, thus, likely subject to aggregation and scavenging removal. Only the iron bound to soluble ligands (<~0.02 ?m) is likely protected from scavenging removal. This implies distinct scavenging regimes for dissolved iron that appear consistent with the observational data: 1) high scavenging regime ? where dissolved iron concentrations exceed the concentrations of strongly binding organic ligands; and 2) moderate scavenging regime ? where dissolved iron is bound to both colloidal and soluble ligands. The removal rates for dissolved iron will be a function of biological uptake, number and size distributions of the colloidal and small particulate material, ligand dynamics, and the aggregation processes that lead to removal on larger particles. Inputs from dust deposition and continental sediments are key drivers of dissolved iron distributions. The observations provide several strong constraints for ocean biogeochemical models: 1) similar deep ocean concentrations in the North Atlantic and North Pacific (~0.6?0.8 nM), and much lower deep ocean dissolved iron concentrations in the Southern Ocean (~0.3?0.4 nM); 2) strong depletion of iron in the upper ocean away from the high dust deposition regions, with significant scavenging removal of dissolved iron below the euphotic zone; and 3) a bimodal distribution in surface waters with peaks less than 0.2 nM and between 0.6?0.8 nM. We compare the dissolved iron observations with output from ... Article in Journal/Newspaper North Atlantic Southern Ocean Université de Nantes: HAL-UNIV-NANTES Southern Ocean Pacific |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Moore, J. K. Braucher, O. Observations of dissolved iron concentrations in the World Ocean: implications and constraints for ocean biogeochemical models |
topic_facet |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Analysis of a global compilation of dissolved iron observations provides insights into the controlling processes for iron distributions and some constraints for ocean biogeochemical models. The distribution of dissolved iron is consistent with the conceptual model developed for the scavenging of Th isotopes, whereby particle scavenging is a two-step process of scavenging mainly by colloidal and small particulates followed by aggregation and removal on larger sinking particles. Much of the dissolved iron (<0.4 ?m) is present as small colloids (>~0.02 ?m) and, thus, likely subject to aggregation and scavenging removal. Only the iron bound to soluble ligands (<~0.02 ?m) is likely protected from scavenging removal. This implies distinct scavenging regimes for dissolved iron that appear consistent with the observational data: 1) high scavenging regime ? where dissolved iron concentrations exceed the concentrations of strongly binding organic ligands; and 2) moderate scavenging regime ? where dissolved iron is bound to both colloidal and soluble ligands. The removal rates for dissolved iron will be a function of biological uptake, number and size distributions of the colloidal and small particulate material, ligand dynamics, and the aggregation processes that lead to removal on larger particles. Inputs from dust deposition and continental sediments are key drivers of dissolved iron distributions. The observations provide several strong constraints for ocean biogeochemical models: 1) similar deep ocean concentrations in the North Atlantic and North Pacific (~0.6?0.8 nM), and much lower deep ocean dissolved iron concentrations in the Southern Ocean (~0.3?0.4 nM); 2) strong depletion of iron in the upper ocean away from the high dust deposition regions, with significant scavenging removal of dissolved iron below the euphotic zone; and 3) a bimodal distribution in surface waters with peaks less than 0.2 nM and between 0.6?0.8 nM. We compare the dissolved iron observations with output from ... |
author2 |
Department of Earth System Science Irvine (ESS) University of California Irvine (UC Irvine) University of California (UC)-University of California (UC) |
format |
Article in Journal/Newspaper |
author |
Moore, J. K. Braucher, O. |
author_facet |
Moore, J. K. Braucher, O. |
author_sort |
Moore, J. K. |
title |
Observations of dissolved iron concentrations in the World Ocean: implications and constraints for ocean biogeochemical models |
title_short |
Observations of dissolved iron concentrations in the World Ocean: implications and constraints for ocean biogeochemical models |
title_full |
Observations of dissolved iron concentrations in the World Ocean: implications and constraints for ocean biogeochemical models |
title_fullStr |
Observations of dissolved iron concentrations in the World Ocean: implications and constraints for ocean biogeochemical models |
title_full_unstemmed |
Observations of dissolved iron concentrations in the World Ocean: implications and constraints for ocean biogeochemical models |
title_sort |
observations of dissolved iron concentrations in the world ocean: implications and constraints for ocean biogeochemical models |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.archives-ouvertes.fr/hal-00297886 https://hal.archives-ouvertes.fr/hal-00297886/document https://hal.archives-ouvertes.fr/hal-00297886/file/bgd-4-1241-2007.pdf |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.archives-ouvertes.fr/hal-00297886 Biogeosciences Discussions, 2007, 4 (2), pp.1241-1277 |
op_relation |
hal-00297886 https://hal.archives-ouvertes.fr/hal-00297886 https://hal.archives-ouvertes.fr/hal-00297886/document https://hal.archives-ouvertes.fr/hal-00297886/file/bgd-4-1241-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766136129844674560 |