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Impact of atmospheric deposition on N and P geochemistry in the southeastern Levantine basin

Impact of atmospheric deposition on N and P geochemistry in the southeastern Levantine basin
Impact of atmospheric deposition on N and P geochemistry in the southeastern Levantine basin
Aeolian dust was collected from 2001 to 2003, as part of a longer-term study, to estimate the nutrient input to the Levantine basin from atmospheric deposition. Adsorption experiments, using dust samples from six individual dust storms, showed insignificant adsorption of phosphate onto dry deposited Saharan dust. Thus adsorption onto dust can be discounted as a reason for the high nitrogen:phosphorus (N:P) ratio in the deep water of the eastern basin. A single dust storm sample from the Western Mediterranean was able to adsorb some phosphate from seawater, and it is speculated that this may be linked to the action of acid aerosols on the dust during cloud formation, or to the varying chemical composition in different sources of dust.

Dry atmospheric deposition is an important net supplier of both N and P to the eastern basin. Leachable inorganic nitrogen concentrations and fluxes are higher in background (non-storm) samples than in storm samples, probably due to the smaller grain size and aerosol source. Total P is supplied naturally with the dust, as shown by the close correlation between total P and Al (r2=0.95). However, there is a poor correlation between leachable inorganic P (LIP) and Al (r2=0.20), which may be related to grain-size effects and/or recycling processes in the atmosphere. Even so, the supply of LIP to surface waters is greatest during dust storms due to comparatively high deposition of aerosol material. While atmospheric input of P during dust storms does not produce significant in situ increases in chlorophyll, probably due to rapid microbial grazing, it does represent an important proportion of the long-term nutrient input to the basin. This may be increasing as the frequency of dust storms increases.
Adsorption, Atmosphere, Deposition, Dust, Phosphorus, Nitrogen, Eastern Mediterranean, Sahara
0967-0645
3041-3053
Carbo, Patricia
62fa3a2b-e419-4020-9a89-12768b7cbf61
Krom, Michael D.
4af9c04d-7ca4-4158-a929-12a03ac44d8b
Homoky, William B.
39da18e9-28b8-42c4-8e17-2cb66af8ee4d
Benning, Liane G.
9ec5c1b9-f878-4194-b011-7548040f83b4
Herut, Barak
4d15be0b-bda6-4b26-9c3c-c5a5b21b33ac
Carbo, Patricia
62fa3a2b-e419-4020-9a89-12768b7cbf61
Krom, Michael D.
4af9c04d-7ca4-4158-a929-12a03ac44d8b
Homoky, William B.
39da18e9-28b8-42c4-8e17-2cb66af8ee4d
Benning, Liane G.
9ec5c1b9-f878-4194-b011-7548040f83b4
Herut, Barak
4d15be0b-bda6-4b26-9c3c-c5a5b21b33ac

Carbo, Patricia, Krom, Michael D., Homoky, William B., Benning, Liane G. and Herut, Barak (2005) Impact of atmospheric deposition on N and P geochemistry in the southeastern Levantine basin. Deep Sea Research Part II: Topical Studies in Oceanography, 52 (22-23), 3041-3053. (doi:10.1016/j.dsr2.2005.08.014).

Record type: Article

Abstract

Aeolian dust was collected from 2001 to 2003, as part of a longer-term study, to estimate the nutrient input to the Levantine basin from atmospheric deposition. Adsorption experiments, using dust samples from six individual dust storms, showed insignificant adsorption of phosphate onto dry deposited Saharan dust. Thus adsorption onto dust can be discounted as a reason for the high nitrogen:phosphorus (N:P) ratio in the deep water of the eastern basin. A single dust storm sample from the Western Mediterranean was able to adsorb some phosphate from seawater, and it is speculated that this may be linked to the action of acid aerosols on the dust during cloud formation, or to the varying chemical composition in different sources of dust.

Dry atmospheric deposition is an important net supplier of both N and P to the eastern basin. Leachable inorganic nitrogen concentrations and fluxes are higher in background (non-storm) samples than in storm samples, probably due to the smaller grain size and aerosol source. Total P is supplied naturally with the dust, as shown by the close correlation between total P and Al (r2=0.95). However, there is a poor correlation between leachable inorganic P (LIP) and Al (r2=0.20), which may be related to grain-size effects and/or recycling processes in the atmosphere. Even so, the supply of LIP to surface waters is greatest during dust storms due to comparatively high deposition of aerosol material. While atmospheric input of P during dust storms does not produce significant in situ increases in chlorophyll, probably due to rapid microbial grazing, it does represent an important proportion of the long-term nutrient input to the basin. This may be increasing as the frequency of dust storms increases.

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More information

Submitted date: 16 August 2005
Published date: 7 November 2005
Keywords: Adsorption, Atmosphere, Deposition, Dust, Phosphorus, Nitrogen, Eastern Mediterranean, Sahara

Identifiers

Local EPrints ID: 67185
URI: https://eprints.soton.ac.uk/id/eprint/67185
ISSN: 0967-0645
PURE UUID: bc4baf78-2ec1-4e5f-9bab-f0c4c183d25f

Catalogue record

Date deposited: 05 Aug 2009
Last modified: 19 Jul 2017 00:20

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