The role of water column stability and wind mixing in the production/export dynamics of two bays in the Western Antarctic Peninsula
Highlights • WAP coastal areas are able to sustain massive summer phytoplankton blooms. • WAP coastal areas may act as strong CO2 and NO3 sinks during summer. • Water column stability is the main driver of high phytoplankton growth rates. • Glacier meltwater supplies Fe, allowing phytoplankton to ne...
Published in: | Progress in Oceanography |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Elsevier
2019
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/45245/ https://doi.org/10.1016/j.pocean.2019.01.005 |
id |
ftoceanrep:oai:oceanrep.geomar.de:45245 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:45245 2023-05-15T13:30:18+02:00 The role of water column stability and wind mixing in the production/export dynamics of two bays in the Western Antarctic Peninsula Höfer, Juan Giesecke, Ricardo Hopwood, Mark J. Carrera, Vania Alarcón, Emilio González, Humberto E. 2019-06 https://oceanrep.geomar.de/id/eprint/45245/ https://doi.org/10.1016/j.pocean.2019.01.005 unknown Elsevier Höfer, J., Giesecke, R. , Hopwood, M. J. , Carrera, V., Alarcón, E. and González, H. E. (2019) The role of water column stability and wind mixing in the production/export dynamics of two bays in the Western Antarctic Peninsula. Progress in Oceanography, 174 . pp. 105-116. DOI 10.1016/j.pocean.2019.01.005 <https://doi.org/10.1016/j.pocean.2019.01.005>. doi:10.1016/j.pocean.2019.01.005 info:eu-repo/semantics/closedAccess Article PeerReviewed 2019 ftoceanrep https://doi.org/10.1016/j.pocean.2019.01.005 2023-04-07T15:43:05Z Highlights • WAP coastal areas are able to sustain massive summer phytoplankton blooms. • WAP coastal areas may act as strong CO2 and NO3 sinks during summer. • Water column stability is the main driver of high phytoplankton growth rates. • Glacier meltwater supplies Fe, allowing phytoplankton to nearly exhaust NO3. • Future higher glacier melting may facilitate complete localized NO3 consumption. Abstract During January and February 2017 massive phytoplankton blooms (chlorophyll > 15 mg m−3) were registered in surface waters within two bays in the Western Antarctic Peninsula (WAP). Reflecting these intense blooms, surface waters exhibited high pH (up to 8.4), low pCO2 (< 175 µatm) and low nitrate concentrations (down to 1.5 µM). These summer phytoplankton blooms consisted mainly of diatoms and were associated with the presence of shallow, surface freshwater plumes originating from glacier-melt outflow which contributed both to stratification and to iron supply, thus facilitating pronounced nitrate and CO2 drawdown. These findings suggest that with future increases in freshwater discharge around the WAP, phytoplankton blooms in the northern WAP may become more dominated by large cells, resembling the blooms occurring further south along the Peninsula. Fresher surface waters enhanced water column stability in both bays, enabling phytoplankton populations to attain high growth rates. Phytoplankton was observed to double their biomass in 2.3 days, consistent with the high net primary production rates recorded in both bays (1.29–8.83 g C m−2 d−1). Phytoplankton growth rates showed a direct mechanistic relationship with changes in water column stability, suggesting that this is a main driver of primary productivity in near-shore Antarctic coastal ecosystems, which agrees with previous findings. After wind induced mixing, the organic matter produced within both bays did not settle inside them, suggesting that it was laterally advected out of the bays. Thus, we hypothesize that highly productive near-shore bay ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Antarctic Peninsula Progress in Oceanography 174 105 116 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
unknown |
description |
Highlights • WAP coastal areas are able to sustain massive summer phytoplankton blooms. • WAP coastal areas may act as strong CO2 and NO3 sinks during summer. • Water column stability is the main driver of high phytoplankton growth rates. • Glacier meltwater supplies Fe, allowing phytoplankton to nearly exhaust NO3. • Future higher glacier melting may facilitate complete localized NO3 consumption. Abstract During January and February 2017 massive phytoplankton blooms (chlorophyll > 15 mg m−3) were registered in surface waters within two bays in the Western Antarctic Peninsula (WAP). Reflecting these intense blooms, surface waters exhibited high pH (up to 8.4), low pCO2 (< 175 µatm) and low nitrate concentrations (down to 1.5 µM). These summer phytoplankton blooms consisted mainly of diatoms and were associated with the presence of shallow, surface freshwater plumes originating from glacier-melt outflow which contributed both to stratification and to iron supply, thus facilitating pronounced nitrate and CO2 drawdown. These findings suggest that with future increases in freshwater discharge around the WAP, phytoplankton blooms in the northern WAP may become more dominated by large cells, resembling the blooms occurring further south along the Peninsula. Fresher surface waters enhanced water column stability in both bays, enabling phytoplankton populations to attain high growth rates. Phytoplankton was observed to double their biomass in 2.3 days, consistent with the high net primary production rates recorded in both bays (1.29–8.83 g C m−2 d−1). Phytoplankton growth rates showed a direct mechanistic relationship with changes in water column stability, suggesting that this is a main driver of primary productivity in near-shore Antarctic coastal ecosystems, which agrees with previous findings. After wind induced mixing, the organic matter produced within both bays did not settle inside them, suggesting that it was laterally advected out of the bays. Thus, we hypothesize that highly productive near-shore bay ... |
format |
Article in Journal/Newspaper |
author |
Höfer, Juan Giesecke, Ricardo Hopwood, Mark J. Carrera, Vania Alarcón, Emilio González, Humberto E. |
spellingShingle |
Höfer, Juan Giesecke, Ricardo Hopwood, Mark J. Carrera, Vania Alarcón, Emilio González, Humberto E. The role of water column stability and wind mixing in the production/export dynamics of two bays in the Western Antarctic Peninsula |
author_facet |
Höfer, Juan Giesecke, Ricardo Hopwood, Mark J. Carrera, Vania Alarcón, Emilio González, Humberto E. |
author_sort |
Höfer, Juan |
title |
The role of water column stability and wind mixing in the production/export dynamics of two bays in the Western Antarctic Peninsula |
title_short |
The role of water column stability and wind mixing in the production/export dynamics of two bays in the Western Antarctic Peninsula |
title_full |
The role of water column stability and wind mixing in the production/export dynamics of two bays in the Western Antarctic Peninsula |
title_fullStr |
The role of water column stability and wind mixing in the production/export dynamics of two bays in the Western Antarctic Peninsula |
title_full_unstemmed |
The role of water column stability and wind mixing in the production/export dynamics of two bays in the Western Antarctic Peninsula |
title_sort |
role of water column stability and wind mixing in the production/export dynamics of two bays in the western antarctic peninsula |
publisher |
Elsevier |
publishDate |
2019 |
url |
https://oceanrep.geomar.de/id/eprint/45245/ https://doi.org/10.1016/j.pocean.2019.01.005 |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_relation |
Höfer, J., Giesecke, R. , Hopwood, M. J. , Carrera, V., Alarcón, E. and González, H. E. (2019) The role of water column stability and wind mixing in the production/export dynamics of two bays in the Western Antarctic Peninsula. Progress in Oceanography, 174 . pp. 105-116. DOI 10.1016/j.pocean.2019.01.005 <https://doi.org/10.1016/j.pocean.2019.01.005>. doi:10.1016/j.pocean.2019.01.005 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.pocean.2019.01.005 |
container_title |
Progress in Oceanography |
container_volume |
174 |
container_start_page |
105 |
op_container_end_page |
116 |
_version_ |
1766006938918715392 |