Evaluating the impact of atmospheric deposition on dissolved trace-metals in the Gulf of Aqaba, Red Sea
Trace metals in the ocean act as both essential micro-nutrients and as toxins. There are relatively few multi-element studies of dissolved trace metals in the ocean, and none from the Gulf of Aqaba, Red Sea. This semi-enclosed basin surrounded by desert is a natural laboratory for studying the impac...
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Online Access: | https://oceanrep.geomar.de/id/eprint/39809/ https://oceanrep.geomar.de/id/eprint/39809/1/Chase.pdf https://doi.org/10.1016/j.marchem.2011.06.005 |
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ftoceanrep:oai:oceanrep.geomar.de:39809 2023-05-15T17:36:59+02:00 Evaluating the impact of atmospheric deposition on dissolved trace-metals in the Gulf of Aqaba, Red Sea Chase, Z. Paytan, A. Beck, Aaron J. Biller, D. Bruland, K. Measures, C. Sañudo-Wilhelmy, S. 2011 text https://oceanrep.geomar.de/id/eprint/39809/ https://oceanrep.geomar.de/id/eprint/39809/1/Chase.pdf https://doi.org/10.1016/j.marchem.2011.06.005 en eng Elsevier https://oceanrep.geomar.de/id/eprint/39809/1/Chase.pdf Chase, Z., Paytan, A., Beck, A. J. , Biller, D., Bruland, K., Measures, C. and Sañudo-Wilhelmy, S. (2011) Evaluating the impact of atmospheric deposition on dissolved trace-metals in the Gulf of Aqaba, Red Sea. Marine Chemistry, 126 (1-4). pp. 256-268. DOI 10.1016/j.marchem.2011.06.005 <https://doi.org/10.1016/j.marchem.2011.06.005>. doi:10.1016/j.marchem.2011.06.005 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2011 ftoceanrep https://doi.org/10.1016/j.marchem.2011.06.005 2023-04-07T15:35:53Z Trace metals in the ocean act as both essential micro-nutrients and as toxins. There are relatively few multi-element studies of dissolved trace metals in the ocean, and none from the Gulf of Aqaba, Red Sea. This semi-enclosed basin surrounded by desert is a natural laboratory for studying the impact of atmospheric dry deposition of trace metals on the ocean surface. We have combined measurement of dissolved metals in seawater with measurements of the flux of metals associated with dry deposition. The total dissolved trace metal concentrations in Gulf of Aqaba water are generally higher (Fe, Cu, Zn, Co, Mn, Pb) or similar (Ni, Al, Cd, Mo) to those measured in the open North Atlantic Ocean. The concentrations of elements that are highly enriched in aerosols relative to Al (e.g. Cd, Pb, Zn and Cu) are not necessarily proportionally enriched in surface seawater when compared to Al, indicative of the high reactivity of these elements in seawater. Iron concentrations in the Gulf of Aqaba are high relative to Al, despite the fact that the aerosols are not more enriched in Fe relative to Al. There may be additional sources of dissolved iron to the Gulf of Aqaba, not associated with Al. Alternatively, intense photochemically-driven redox cycling may act to enhance Fe dissolution from aerosols, or may otherwise increase the lifetime of Fe in the water column, relative to Al. Copper concentrations in the Gulf of Aqaba are close to the value found to be a threshold for Cu toxicity in this region. A surface maximum in Cd:P is found in the Gulf of Aqaba, in contrast to the more typical surface minimum in this ratio observed in other locations. The surface maximum appears to be driven by atypically low uptake of Cd relative to P. A low Cd:P uptake ratio for this region is consistent with known environmental determinants of low Cd:P uptake, such as high concentrations of dissolved Zn and Fe, and a predominance of small phytoplankton including cyanobacteria. Highlights ► We measured dissolved trace metal concentrations in the ... Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Marine Chemistry 126 1-4 256 268 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Trace metals in the ocean act as both essential micro-nutrients and as toxins. There are relatively few multi-element studies of dissolved trace metals in the ocean, and none from the Gulf of Aqaba, Red Sea. This semi-enclosed basin surrounded by desert is a natural laboratory for studying the impact of atmospheric dry deposition of trace metals on the ocean surface. We have combined measurement of dissolved metals in seawater with measurements of the flux of metals associated with dry deposition. The total dissolved trace metal concentrations in Gulf of Aqaba water are generally higher (Fe, Cu, Zn, Co, Mn, Pb) or similar (Ni, Al, Cd, Mo) to those measured in the open North Atlantic Ocean. The concentrations of elements that are highly enriched in aerosols relative to Al (e.g. Cd, Pb, Zn and Cu) are not necessarily proportionally enriched in surface seawater when compared to Al, indicative of the high reactivity of these elements in seawater. Iron concentrations in the Gulf of Aqaba are high relative to Al, despite the fact that the aerosols are not more enriched in Fe relative to Al. There may be additional sources of dissolved iron to the Gulf of Aqaba, not associated with Al. Alternatively, intense photochemically-driven redox cycling may act to enhance Fe dissolution from aerosols, or may otherwise increase the lifetime of Fe in the water column, relative to Al. Copper concentrations in the Gulf of Aqaba are close to the value found to be a threshold for Cu toxicity in this region. A surface maximum in Cd:P is found in the Gulf of Aqaba, in contrast to the more typical surface minimum in this ratio observed in other locations. The surface maximum appears to be driven by atypically low uptake of Cd relative to P. A low Cd:P uptake ratio for this region is consistent with known environmental determinants of low Cd:P uptake, such as high concentrations of dissolved Zn and Fe, and a predominance of small phytoplankton including cyanobacteria. Highlights ► We measured dissolved trace metal concentrations in the ... |
format |
Article in Journal/Newspaper |
author |
Chase, Z. Paytan, A. Beck, Aaron J. Biller, D. Bruland, K. Measures, C. Sañudo-Wilhelmy, S. |
spellingShingle |
Chase, Z. Paytan, A. Beck, Aaron J. Biller, D. Bruland, K. Measures, C. Sañudo-Wilhelmy, S. Evaluating the impact of atmospheric deposition on dissolved trace-metals in the Gulf of Aqaba, Red Sea |
author_facet |
Chase, Z. Paytan, A. Beck, Aaron J. Biller, D. Bruland, K. Measures, C. Sañudo-Wilhelmy, S. |
author_sort |
Chase, Z. |
title |
Evaluating the impact of atmospheric deposition on dissolved trace-metals in the Gulf of Aqaba, Red Sea |
title_short |
Evaluating the impact of atmospheric deposition on dissolved trace-metals in the Gulf of Aqaba, Red Sea |
title_full |
Evaluating the impact of atmospheric deposition on dissolved trace-metals in the Gulf of Aqaba, Red Sea |
title_fullStr |
Evaluating the impact of atmospheric deposition on dissolved trace-metals in the Gulf of Aqaba, Red Sea |
title_full_unstemmed |
Evaluating the impact of atmospheric deposition on dissolved trace-metals in the Gulf of Aqaba, Red Sea |
title_sort |
evaluating the impact of atmospheric deposition on dissolved trace-metals in the gulf of aqaba, red sea |
publisher |
Elsevier |
publishDate |
2011 |
url |
https://oceanrep.geomar.de/id/eprint/39809/ https://oceanrep.geomar.de/id/eprint/39809/1/Chase.pdf https://doi.org/10.1016/j.marchem.2011.06.005 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/39809/1/Chase.pdf Chase, Z., Paytan, A., Beck, A. J. , Biller, D., Bruland, K., Measures, C. and Sañudo-Wilhelmy, S. (2011) Evaluating the impact of atmospheric deposition on dissolved trace-metals in the Gulf of Aqaba, Red Sea. Marine Chemistry, 126 (1-4). pp. 256-268. DOI 10.1016/j.marchem.2011.06.005 <https://doi.org/10.1016/j.marchem.2011.06.005>. doi:10.1016/j.marchem.2011.06.005 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.marchem.2011.06.005 |
container_title |
Marine Chemistry |
container_volume |
126 |
container_issue |
1-4 |
container_start_page |
256 |
op_container_end_page |
268 |
_version_ |
1766136660601339904 |