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Quantifying the impact of atmospheric deposition on the biogeochemistry of Fe and Al in the upper ocean: a decade of collaboration with the US CLIVAR-CO2 Repeat Hydrography Program

Quantifying the impact of atmospheric deposition on the biogeochemistry of Fe and Al in the upper ocean: a decade of collaboration with the US CLIVAR-CO2 Repeat Hydrography Program
Quantifying the impact of atmospheric deposition on the biogeochemistry of Fe and Al in the upper ocean: a decade of collaboration with the US CLIVAR-CO2 Repeat Hydrography Program
The aerosol deposition of continental material and its partial dissolution in the surface ocean exerts an important control on the distribution of iron and other potentially limiting trace metal (TM) micronutrients in the open ocean. This dust deposition has implications for the regulation of global climate through the coupling of biolimiting TM cycles, marine productivity, and the global carbon cycle. Thus, it is important to determine the locations of dust deposition in the open ocean and to quantify the magnitude and subsequent dissolution of the dust. At present, there are too few dust deposition estimates and solubility measurements in the open ocean to adequately constrain this key source term in global biogeochemical models.

While early sampling efforts were invaluable in highlighting the importance of TMs in regulating nutrient cycling and phytoplankton productivity in vast ocean regions, they lacked the spatial resolution and global coverage required to constrain model simulations and identify features that illuminate the processes controlling TM distributions. Starting in 2003, the US Climate Variability and Predictability (CLIVAR)-CO2 Repeat Hydrography Program provided an hour of ship time for dedicated TM sampling at every degree of latitude or longitude along selected cruise tracks. The principal goals for CLIVAR TM sampling were to produce a high-resolution dissolved iron (Fe) and aluminum (Al) data set with global coverage to better understand upper-ocean Fe biogeochemistry, determine patterns of atmospheric dust deposition based on surface dissolved Al levels, and improve our estimates of the fractional solubility of aerosol TMs using a dedicated shipboard aerosol sampling program. This paper describes recent advances in our understanding of dust deposition and the solubility of aerosol material resulting from 10 years of collaborative work under the US CLIVAR-CO2 Repeat Hydrography Program.
1042-8275
62-65
Grand, Maxime
659acbde-d639-42b7-9fab-52fa1b3655ff
Buck, Clifton
9eaa8eba-6780-4374-b51c-ce58f46200f0
Landing, William
ae3b6524-4312-414e-838b-772655a06d97
Measures, Christopher
57606088-122d-490f-a3d3-f5b241f72ea6
Hatta, Mariko
b8c210ca-90aa-4660-b1b7-3538b120e31d
Hiscock, William
e9e9b53b-58f0-432d-84a4-fe1e6a9fc30e
Brown, Matthew
177a0c56-a484-440b-8518-b4b9872521a1
Resing, Joseph
18c6f4c8-faa9-472e-b2bd-097435dbe8d6
Grand, Maxime
659acbde-d639-42b7-9fab-52fa1b3655ff
Buck, Clifton
9eaa8eba-6780-4374-b51c-ce58f46200f0
Landing, William
ae3b6524-4312-414e-838b-772655a06d97
Measures, Christopher
57606088-122d-490f-a3d3-f5b241f72ea6
Hatta, Mariko
b8c210ca-90aa-4660-b1b7-3538b120e31d
Hiscock, William
e9e9b53b-58f0-432d-84a4-fe1e6a9fc30e
Brown, Matthew
177a0c56-a484-440b-8518-b4b9872521a1
Resing, Joseph
18c6f4c8-faa9-472e-b2bd-097435dbe8d6

Grand, Maxime, Buck, Clifton, Landing, William, Measures, Christopher, Hatta, Mariko, Hiscock, William, Brown, Matthew and Resing, Joseph (2014) Quantifying the impact of atmospheric deposition on the biogeochemistry of Fe and Al in the upper ocean: a decade of collaboration with the US CLIVAR-CO2 Repeat Hydrography Program. Oceanography, 27 (1), 62-65. (doi:10.5670/oceanog.2014.08).

Record type: Article

Abstract

The aerosol deposition of continental material and its partial dissolution in the surface ocean exerts an important control on the distribution of iron and other potentially limiting trace metal (TM) micronutrients in the open ocean. This dust deposition has implications for the regulation of global climate through the coupling of biolimiting TM cycles, marine productivity, and the global carbon cycle. Thus, it is important to determine the locations of dust deposition in the open ocean and to quantify the magnitude and subsequent dissolution of the dust. At present, there are too few dust deposition estimates and solubility measurements in the open ocean to adequately constrain this key source term in global biogeochemical models.

While early sampling efforts were invaluable in highlighting the importance of TMs in regulating nutrient cycling and phytoplankton productivity in vast ocean regions, they lacked the spatial resolution and global coverage required to constrain model simulations and identify features that illuminate the processes controlling TM distributions. Starting in 2003, the US Climate Variability and Predictability (CLIVAR)-CO2 Repeat Hydrography Program provided an hour of ship time for dedicated TM sampling at every degree of latitude or longitude along selected cruise tracks. The principal goals for CLIVAR TM sampling were to produce a high-resolution dissolved iron (Fe) and aluminum (Al) data set with global coverage to better understand upper-ocean Fe biogeochemistry, determine patterns of atmospheric dust deposition based on surface dissolved Al levels, and improve our estimates of the fractional solubility of aerosol TMs using a dedicated shipboard aerosol sampling program. This paper describes recent advances in our understanding of dust deposition and the solubility of aerosol material resulting from 10 years of collaborative work under the US CLIVAR-CO2 Repeat Hydrography Program.

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Published date: 2014
Organisations: Geochemistry

Identifiers

Local EPrints ID: 379894
URI: http://eprints.soton.ac.uk/id/eprint/379894
ISSN: 1042-8275
PURE UUID: 68790743-5680-48fd-801d-af3d6dd56614
ORCID for Maxime Grand: ORCID iD orcid.org/0000-0001-9338-694X

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Date deposited: 03 Aug 2015 13:54
Last modified: 14 Mar 2024 20:51

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Contributors

Author: Maxime Grand ORCID iD
Author: Clifton Buck
Author: William Landing
Author: Christopher Measures
Author: Mariko Hatta
Author: William Hiscock
Author: Matthew Brown
Author: Joseph Resing

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