Micro- and macronutrients in the southeastern Bering Sea: Insight into iron-replete and iron-depleted regimes
Surface transects and vertical profiles of macronutrients, dissolved iron (D-Fe), and dissolved manganese (D-Mn) were investigated during August 2003 in the southeastern Bering Sea. We observed iron-limited, HNLC surface waters in the deep basin of the Bering Sea (15-20 μmol/kg nitrate, ∼0.07 nmol/k...
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ftsouthampton:oai:eprints.soton.ac.uk:413898 2023-07-30T04:02:40+02:00 Micro- and macronutrients in the southeastern Bering Sea: Insight into iron-replete and iron-depleted regimes Aguilar-Islas, Ana M. Hurst, Matthew P. Buck, Kristen N. Sohst, Bettina Smith, Geoffrey J. Lohan, Maeve C. Bruland, Kenneth W. 2007-05 https://eprints.soton.ac.uk/413898/ English eng Aguilar-Islas, Ana M., Hurst, Matthew P., Buck, Kristen N., Sohst, Bettina, Smith, Geoffrey J., Lohan, Maeve C. and Bruland, Kenneth W. (2007) Micro- and macronutrients in the southeastern Bering Sea: Insight into iron-replete and iron-depleted regimes. Progress in Oceanography, 73 (2), 99-126. (doi:10.1016/j.pocean.2006.12.002 <http://dx.doi.org/10.1016/j.pocean.2006.12.002>). Article PeerReviewed 2007 ftsouthampton https://doi.org/10.1016/j.pocean.2006.12.002 2023-07-09T22:17:38Z Surface transects and vertical profiles of macronutrients, dissolved iron (D-Fe), and dissolved manganese (D-Mn) were investigated during August 2003 in the southeastern Bering Sea. We observed iron-limited, HNLC surface waters in the deep basin of the Bering Sea (15-20 μmol/kg nitrate, ∼0.07 nmol/kg D-Fe, and ≤1.0 nmol/kg D-Mn); nitrate-limited, iron-replete surface waters over the shelf (<0.1 μmol/kg nitrate, 0.5-4 nmol/kg D-Fe, and 2-33 nmol/kg D-Mn); and high biomass at the shelf break ("Green Belt"), where diatoms appeared to have been stressed by low D-Fe concentrations (<0.3 nmol/kg). Sources of nitrate and iron to the Green Belt were investigated. A mixture of Aleutian North Slope Current water (with elevated, but non-sufficient iron concentrations relative to its high nitrate concentrations) and surface waters from the vicinity of the Bering Canyon (with lower nitrate concentrations, but similar dissolved iron concentrations) was carried along the shelf break by the Bering Slope Current. This water mixture provided macro- and micronutrients at the southern end of the shelf break. The oceanic domain supplied additional macronutrients to Green Belt waters, while the bottom layer of the outer shelf domain supplied additional macro- and micronutrients through enhanced vertical mixing at the shelf break. Surface waters near the Pribilof Islands, where the highest surface D-Fe concentrations were observed (∼5-6 nmol/kg), represent a potential source of additional iron to Green Belt waters. During summer, the subsurface water of the middle shelf domain is a potential source of nitrate to the nitrate depleted waters of the shelf. In this subsurface cool pool, we observed evidence of substantial denitrification with lower than expected nitrate concentrations. Article in Journal/Newspaper Bering Sea University of Southampton: e-Prints Soton Bering Canyon ENVELOPE(-165.032,-165.032,54.894,54.894) Bering Sea Progress in Oceanography 73 2 99 126 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Surface transects and vertical profiles of macronutrients, dissolved iron (D-Fe), and dissolved manganese (D-Mn) were investigated during August 2003 in the southeastern Bering Sea. We observed iron-limited, HNLC surface waters in the deep basin of the Bering Sea (15-20 μmol/kg nitrate, ∼0.07 nmol/kg D-Fe, and ≤1.0 nmol/kg D-Mn); nitrate-limited, iron-replete surface waters over the shelf (<0.1 μmol/kg nitrate, 0.5-4 nmol/kg D-Fe, and 2-33 nmol/kg D-Mn); and high biomass at the shelf break ("Green Belt"), where diatoms appeared to have been stressed by low D-Fe concentrations (<0.3 nmol/kg). Sources of nitrate and iron to the Green Belt were investigated. A mixture of Aleutian North Slope Current water (with elevated, but non-sufficient iron concentrations relative to its high nitrate concentrations) and surface waters from the vicinity of the Bering Canyon (with lower nitrate concentrations, but similar dissolved iron concentrations) was carried along the shelf break by the Bering Slope Current. This water mixture provided macro- and micronutrients at the southern end of the shelf break. The oceanic domain supplied additional macronutrients to Green Belt waters, while the bottom layer of the outer shelf domain supplied additional macro- and micronutrients through enhanced vertical mixing at the shelf break. Surface waters near the Pribilof Islands, where the highest surface D-Fe concentrations were observed (∼5-6 nmol/kg), represent a potential source of additional iron to Green Belt waters. During summer, the subsurface water of the middle shelf domain is a potential source of nitrate to the nitrate depleted waters of the shelf. In this subsurface cool pool, we observed evidence of substantial denitrification with lower than expected nitrate concentrations. |
format |
Article in Journal/Newspaper |
author |
Aguilar-Islas, Ana M. Hurst, Matthew P. Buck, Kristen N. Sohst, Bettina Smith, Geoffrey J. Lohan, Maeve C. Bruland, Kenneth W. |
spellingShingle |
Aguilar-Islas, Ana M. Hurst, Matthew P. Buck, Kristen N. Sohst, Bettina Smith, Geoffrey J. Lohan, Maeve C. Bruland, Kenneth W. Micro- and macronutrients in the southeastern Bering Sea: Insight into iron-replete and iron-depleted regimes |
author_facet |
Aguilar-Islas, Ana M. Hurst, Matthew P. Buck, Kristen N. Sohst, Bettina Smith, Geoffrey J. Lohan, Maeve C. Bruland, Kenneth W. |
author_sort |
Aguilar-Islas, Ana M. |
title |
Micro- and macronutrients in the southeastern Bering Sea: Insight into iron-replete and iron-depleted regimes |
title_short |
Micro- and macronutrients in the southeastern Bering Sea: Insight into iron-replete and iron-depleted regimes |
title_full |
Micro- and macronutrients in the southeastern Bering Sea: Insight into iron-replete and iron-depleted regimes |
title_fullStr |
Micro- and macronutrients in the southeastern Bering Sea: Insight into iron-replete and iron-depleted regimes |
title_full_unstemmed |
Micro- and macronutrients in the southeastern Bering Sea: Insight into iron-replete and iron-depleted regimes |
title_sort |
micro- and macronutrients in the southeastern bering sea: insight into iron-replete and iron-depleted regimes |
publishDate |
2007 |
url |
https://eprints.soton.ac.uk/413898/ |
long_lat |
ENVELOPE(-165.032,-165.032,54.894,54.894) |
geographic |
Bering Canyon Bering Sea |
geographic_facet |
Bering Canyon Bering Sea |
genre |
Bering Sea |
genre_facet |
Bering Sea |
op_relation |
Aguilar-Islas, Ana M., Hurst, Matthew P., Buck, Kristen N., Sohst, Bettina, Smith, Geoffrey J., Lohan, Maeve C. and Bruland, Kenneth W. (2007) Micro- and macronutrients in the southeastern Bering Sea: Insight into iron-replete and iron-depleted regimes. Progress in Oceanography, 73 (2), 99-126. (doi:10.1016/j.pocean.2006.12.002 <http://dx.doi.org/10.1016/j.pocean.2006.12.002>). |
op_doi |
https://doi.org/10.1016/j.pocean.2006.12.002 |
container_title |
Progress in Oceanography |
container_volume |
73 |
container_issue |
2 |
container_start_page |
99 |
op_container_end_page |
126 |
_version_ |
1772813489374494720 |