Macronutrient supply, uptake and recycling in the coastal ocean of the west Antarctic Peninsula
Nutrient supply, uptake and cycling underpin high primary productivity over the continental shelf of the west Antarctic Peninsula (WAP). Here we use a suite of biogeochemical and isotopic data collected over five years in northern Marguerite Bay to examine these macronutrient dynamics and their cont...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Language: | English |
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Online Access: | https://eprints.soton.ac.uk/418527/ https://eprints.soton.ac.uk/418527/1/1_s2.0_S0967064516303034_main.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:418527 2023-07-30T03:58:20+02:00 Macronutrient supply, uptake and recycling in the coastal ocean of the west Antarctic Peninsula Henley, Sian F. Tuerena, Robyn E. Annett, Amber L. Fallick, Anthony E. Meredith, Michael P. Venables, Hugh J. Clarke, Andrew Ganeshram, Raja S. 2017-05-01 text https://eprints.soton.ac.uk/418527/ https://eprints.soton.ac.uk/418527/1/1_s2.0_S0967064516303034_main.pdf en English eng https://eprints.soton.ac.uk/418527/1/1_s2.0_S0967064516303034_main.pdf Henley, Sian F., Tuerena, Robyn E., Annett, Amber L., Fallick, Anthony E., Meredith, Michael P., Venables, Hugh J., Clarke, Andrew and Ganeshram, Raja S. (2017) Macronutrient supply, uptake and recycling in the coastal ocean of the west Antarctic Peninsula. Deep-Sea Research Part II: Topical Studies in Oceanography, 139, 58-76. (doi:10.1016/j.dsr2.2016.10.003 <http://dx.doi.org/10.1016/j.dsr2.2016.10.003>). cc_by_4 Article PeerReviewed 2017 ftsouthampton https://doi.org/10.1016/j.dsr2.2016.10.003 2023-07-09T22:21:00Z Nutrient supply, uptake and cycling underpin high primary productivity over the continental shelf of the west Antarctic Peninsula (WAP). Here we use a suite of biogeochemical and isotopic data collected over five years in northern Marguerite Bay to examine these macronutrient dynamics and their controlling biological and physical processes in the WAP coastal ocean. We show pronounced nutrient drawdown over the summer months by primary production which drives a net seasonal nitrate uptake of 1.83 mol N m -2 yr -1 , equivalent to net carbon uptake of 146 g C m -2 yr -1 . High primary production fuelled primarily by deep-sourced macronutrients is diatom-dominated, but non-siliceous phytoplankton also play a role. Strong nutrient drawdown in the uppermost surface ocean has the potential to cause transient nitrogen limitation before nutrient resupply and/or regeneration. Interannual variability in nutrient utilisation corresponds to winter sea ice duration and the degree of upper ocean mixing, implying susceptibility to physical climate change. The nitrogen isotope composition of nitrate (δ 15 N NO3 ) shows a utilisation signal during the growing seasons with a community-level net isotope effect of 4.19 ± 0.29‰. We also observe significant deviation of our data from modelled and observed utilisation trends, and argue that this is driven primarily by water column nitrification and meltwater dilution of surface nitrate. This study is important because it provides a detailed description of the nutrient biogeochemistry underlying high primary productivity at the WAP, and shows that surface ocean nutrient inventories in the Antarctic sea ice zone can be affected by intense recycling in the water column, meltwater dilution and sea ice processes, in addition to utilisation in the upper ocean. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Sea ice University of Southampton: e-Prints Soton Antarctic Antarctic Peninsula Marguerite ENVELOPE(141.378,141.378,-66.787,-66.787) Marguerite Bay ENVELOPE(-68.000,-68.000,-68.500,-68.500) The Antarctic Deep Sea Research Part II: Topical Studies in Oceanography 139 58 76 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Nutrient supply, uptake and cycling underpin high primary productivity over the continental shelf of the west Antarctic Peninsula (WAP). Here we use a suite of biogeochemical and isotopic data collected over five years in northern Marguerite Bay to examine these macronutrient dynamics and their controlling biological and physical processes in the WAP coastal ocean. We show pronounced nutrient drawdown over the summer months by primary production which drives a net seasonal nitrate uptake of 1.83 mol N m -2 yr -1 , equivalent to net carbon uptake of 146 g C m -2 yr -1 . High primary production fuelled primarily by deep-sourced macronutrients is diatom-dominated, but non-siliceous phytoplankton also play a role. Strong nutrient drawdown in the uppermost surface ocean has the potential to cause transient nitrogen limitation before nutrient resupply and/or regeneration. Interannual variability in nutrient utilisation corresponds to winter sea ice duration and the degree of upper ocean mixing, implying susceptibility to physical climate change. The nitrogen isotope composition of nitrate (δ 15 N NO3 ) shows a utilisation signal during the growing seasons with a community-level net isotope effect of 4.19 ± 0.29‰. We also observe significant deviation of our data from modelled and observed utilisation trends, and argue that this is driven primarily by water column nitrification and meltwater dilution of surface nitrate. This study is important because it provides a detailed description of the nutrient biogeochemistry underlying high primary productivity at the WAP, and shows that surface ocean nutrient inventories in the Antarctic sea ice zone can be affected by intense recycling in the water column, meltwater dilution and sea ice processes, in addition to utilisation in the upper ocean. |
format |
Article in Journal/Newspaper |
author |
Henley, Sian F. Tuerena, Robyn E. Annett, Amber L. Fallick, Anthony E. Meredith, Michael P. Venables, Hugh J. Clarke, Andrew Ganeshram, Raja S. |
spellingShingle |
Henley, Sian F. Tuerena, Robyn E. Annett, Amber L. Fallick, Anthony E. Meredith, Michael P. Venables, Hugh J. Clarke, Andrew Ganeshram, Raja S. Macronutrient supply, uptake and recycling in the coastal ocean of the west Antarctic Peninsula |
author_facet |
Henley, Sian F. Tuerena, Robyn E. Annett, Amber L. Fallick, Anthony E. Meredith, Michael P. Venables, Hugh J. Clarke, Andrew Ganeshram, Raja S. |
author_sort |
Henley, Sian F. |
title |
Macronutrient supply, uptake and recycling in the coastal ocean of the west Antarctic Peninsula |
title_short |
Macronutrient supply, uptake and recycling in the coastal ocean of the west Antarctic Peninsula |
title_full |
Macronutrient supply, uptake and recycling in the coastal ocean of the west Antarctic Peninsula |
title_fullStr |
Macronutrient supply, uptake and recycling in the coastal ocean of the west Antarctic Peninsula |
title_full_unstemmed |
Macronutrient supply, uptake and recycling in the coastal ocean of the west Antarctic Peninsula |
title_sort |
macronutrient supply, uptake and recycling in the coastal ocean of the west antarctic peninsula |
publishDate |
2017 |
url |
https://eprints.soton.ac.uk/418527/ https://eprints.soton.ac.uk/418527/1/1_s2.0_S0967064516303034_main.pdf |
long_lat |
ENVELOPE(141.378,141.378,-66.787,-66.787) ENVELOPE(-68.000,-68.000,-68.500,-68.500) |
geographic |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Marguerite Marguerite Bay The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Sea ice |
op_relation |
https://eprints.soton.ac.uk/418527/1/1_s2.0_S0967064516303034_main.pdf Henley, Sian F., Tuerena, Robyn E., Annett, Amber L., Fallick, Anthony E., Meredith, Michael P., Venables, Hugh J., Clarke, Andrew and Ganeshram, Raja S. (2017) Macronutrient supply, uptake and recycling in the coastal ocean of the west Antarctic Peninsula. Deep-Sea Research Part II: Topical Studies in Oceanography, 139, 58-76. (doi:10.1016/j.dsr2.2016.10.003 <http://dx.doi.org/10.1016/j.dsr2.2016.10.003>). |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1016/j.dsr2.2016.10.003 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
139 |
container_start_page |
58 |
op_container_end_page |
76 |
_version_ |
1772821165960593408 |