Summer carbonate chemistry in the Dalton Polynya, East Antarctica
The carbonate chemistry in the Dalton Polynya in East Antarctica (115°–123°E) was investigated in summer 2014/2015 using high‐frequency underway measurements of CO2 fugacity (fCO2) and discrete water column measurements of total dissolved inorganic carbon (TCO2) and total alkalinity. Air‐sea CO2 flu...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley-Blackwell Publishing Inc.
2019
|
Subjects: | |
Online Access: | https://eprints.utas.edu.au/42581/ https://eprints.utas.edu.au/42581/1/143149%20-%20Summer%20carbonate%20chemistry%20in%20the%20Dalton%20Polynya.pdf |
id |
ftunivtasmania:oai:eprints.utas.edu.au:42581 |
---|---|
record_format |
openpolar |
spelling |
ftunivtasmania:oai:eprints.utas.edu.au:42581 2023-05-15T13:41:50+02:00 Summer carbonate chemistry in the Dalton Polynya, East Antarctica Arroyo, MC Shadwick, EH Tilbrook, B 2019 application/pdf https://eprints.utas.edu.au/42581/ https://eprints.utas.edu.au/42581/1/143149%20-%20Summer%20carbonate%20chemistry%20in%20the%20Dalton%20Polynya.pdf en eng Wiley-Blackwell Publishing Inc. https://eprints.utas.edu.au/42581/1/143149%20-%20Summer%20carbonate%20chemistry%20in%20the%20Dalton%20Polynya.pdf Arroyo, MC, Shadwick, EH and Tilbrook, B 2019 , 'Summer carbonate chemistry in the Dalton Polynya, East Antarctica' , Journal of Geophysical Research: Oceans, vol. 124, no. 8 , pp. 5634-5653 , doi:10.1029/2018JC014882 <http://dx.doi.org/10.1029/2018JC014882>. carbonate Dalton Peninsula Antarctica CO2 Article PeerReviewed 2019 ftunivtasmania https://doi.org/10.1029/2018JC014882 2022-02-07T23:18:56Z The carbonate chemistry in the Dalton Polynya in East Antarctica (115°–123°E) was investigated in summer 2014/2015 using high‐frequency underway measurements of CO2 fugacity (fCO2) and discrete water column measurements of total dissolved inorganic carbon (TCO2) and total alkalinity. Air‐sea CO2 fluxes indicate this region was a weak net source of CO2 to the atmosphere (0.7 ± 0.9 mmol C m−2 day−1) during the period of observation, with the largest degree of surface water supersaturation (ΔfCO2 = +45 μatm) in ice‐covered waters near the Totten Ice Shelf (TIS) as compared to the ice‐free surface waters in the Dalton Polynya. The seasonal depletion of mixed‐layer TCO2 (6 to 51 μmol/kg) in ice‐free regions was primarily driven by sea ice melt and biological CO2 uptake. Estimates of net community production (NCP) reveal net autotrophy in the ice‐free Dalton Polynya (NCP = 5–20 mmol C m−2 day−1) and weakly heterotrophic waters near the ice‐covered TIS (NCP = −4–0 mmol C m−2 day−1). Satellite‐derived estimates of chlorophyll a (Chl a) and sea ice coverage suggest that the early summer season in 2014/2015 was anomalous relative to the long‐term (1997–2017) record, with lower surface Chl a concentrations and a greater degree of sea ice cover during the period of observation; the implications for seasonal primary production and air‐sea CO2 exchange are discussed. This study highlights the importance of both physical and biological processes in controlling air‐sea CO2 fluxes and the significant interannual variability of the CO2 system in Antarctic coastal regions. Article in Journal/Newspaper Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Shelf Sea ice Totten Ice Shelf ice covered waters University of Tasmania: UTas ePrints Antarctic East Antarctica Journal of Geophysical Research: Oceans 124 8 5634 5653 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
carbonate Dalton Peninsula Antarctica CO2 |
spellingShingle |
carbonate Dalton Peninsula Antarctica CO2 Arroyo, MC Shadwick, EH Tilbrook, B Summer carbonate chemistry in the Dalton Polynya, East Antarctica |
topic_facet |
carbonate Dalton Peninsula Antarctica CO2 |
description |
The carbonate chemistry in the Dalton Polynya in East Antarctica (115°–123°E) was investigated in summer 2014/2015 using high‐frequency underway measurements of CO2 fugacity (fCO2) and discrete water column measurements of total dissolved inorganic carbon (TCO2) and total alkalinity. Air‐sea CO2 fluxes indicate this region was a weak net source of CO2 to the atmosphere (0.7 ± 0.9 mmol C m−2 day−1) during the period of observation, with the largest degree of surface water supersaturation (ΔfCO2 = +45 μatm) in ice‐covered waters near the Totten Ice Shelf (TIS) as compared to the ice‐free surface waters in the Dalton Polynya. The seasonal depletion of mixed‐layer TCO2 (6 to 51 μmol/kg) in ice‐free regions was primarily driven by sea ice melt and biological CO2 uptake. Estimates of net community production (NCP) reveal net autotrophy in the ice‐free Dalton Polynya (NCP = 5–20 mmol C m−2 day−1) and weakly heterotrophic waters near the ice‐covered TIS (NCP = −4–0 mmol C m−2 day−1). Satellite‐derived estimates of chlorophyll a (Chl a) and sea ice coverage suggest that the early summer season in 2014/2015 was anomalous relative to the long‐term (1997–2017) record, with lower surface Chl a concentrations and a greater degree of sea ice cover during the period of observation; the implications for seasonal primary production and air‐sea CO2 exchange are discussed. This study highlights the importance of both physical and biological processes in controlling air‐sea CO2 fluxes and the significant interannual variability of the CO2 system in Antarctic coastal regions. |
format |
Article in Journal/Newspaper |
author |
Arroyo, MC Shadwick, EH Tilbrook, B |
author_facet |
Arroyo, MC Shadwick, EH Tilbrook, B |
author_sort |
Arroyo, MC |
title |
Summer carbonate chemistry in the Dalton Polynya, East Antarctica |
title_short |
Summer carbonate chemistry in the Dalton Polynya, East Antarctica |
title_full |
Summer carbonate chemistry in the Dalton Polynya, East Antarctica |
title_fullStr |
Summer carbonate chemistry in the Dalton Polynya, East Antarctica |
title_full_unstemmed |
Summer carbonate chemistry in the Dalton Polynya, East Antarctica |
title_sort |
summer carbonate chemistry in the dalton polynya, east antarctica |
publisher |
Wiley-Blackwell Publishing Inc. |
publishDate |
2019 |
url |
https://eprints.utas.edu.au/42581/ https://eprints.utas.edu.au/42581/1/143149%20-%20Summer%20carbonate%20chemistry%20in%20the%20Dalton%20Polynya.pdf |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Shelf Sea ice Totten Ice Shelf ice covered waters |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal East Antarctica Ice Shelf Sea ice Totten Ice Shelf ice covered waters |
op_relation |
https://eprints.utas.edu.au/42581/1/143149%20-%20Summer%20carbonate%20chemistry%20in%20the%20Dalton%20Polynya.pdf Arroyo, MC, Shadwick, EH and Tilbrook, B 2019 , 'Summer carbonate chemistry in the Dalton Polynya, East Antarctica' , Journal of Geophysical Research: Oceans, vol. 124, no. 8 , pp. 5634-5653 , doi:10.1029/2018JC014882 <http://dx.doi.org/10.1029/2018JC014882>. |
op_doi |
https://doi.org/10.1029/2018JC014882 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
124 |
container_issue |
8 |
container_start_page |
5634 |
op_container_end_page |
5653 |
_version_ |
1766158758343344128 |