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High-resolution spatial distribution of pCO2 in the coastal Southern Ocean in late spring

Published online by Cambridge University Press:  02 July 2020

Ludmila S. Caetano ,
Ricardo C.G. Pollery ,
Rodrigo Kerr ,
Fábio Magrani ,
Arthur Ayres Neto ,
Rosemary Vieira  and
Humberto Marotta
Ludmila S. Caetano
Affiliation:
Sedimentary and Environmental Processes Laboratory (LAPSA-UFF), Department of Geography, Graduate Program in Geography, Federal Fluminense University (UFF), Av. Gal. Milton Tavares de Souza, s/n, Niterói, RJ, 24210-346, Brazil Ecosystems and Global Change Laboratory (LEMG-UFF)/International Laboratory of Global Change (LINCGlobal), Biomass and Water Management Research Center (NAB-UFF), Graduate Program in Geosciences (Environmental Geochemistry), Federal Fluminense University (UFF), Av. Edmundo March, s/n, Niterói, RJ, 24210-310, Brazil
Ricardo C.G. Pollery
Affiliation:
Multi-User Unit for Environmental Analysis - Health Sciences Center, Federal University of Rio de Janeiro (UFRJ), Prédio Inter bloco A-F, Av. Carlos Chagas Filho, 373 - Ilha do Fundão - Cidade Universitária, Rio de Janeiro, RJ, 21941-971, Brazil
Rodrigo Kerr
Affiliation:
Ocean and Climate Studies Laboratory, Institute of Oceanography, Federal University of Rio Grande (FURG), Av. Itália km 8, s/n, Rio Grande, RS, 96203-900, Brazil
Fábio Magrani
Affiliation:
Laboratory of Marine Geophysics (LAGEMAR-UFF), Graduate Program in Geosciences (Dynamics of the Oceans and the Earth), Federal Fluminense University (UFF), Av. Gal. Milton Tavares de Souza, s/n, Niterói, RJ, 24210-346, Brazil Institute of Geological Sciences, University of Bern, Baltzerstrasse 3, 3012 Bern, Switzerland
Arthur Ayres Neto
Affiliation:
Laboratory of Marine Geophysics (LAGEMAR-UFF), Graduate Program in Geosciences (Dynamics of the Oceans and the Earth), Federal Fluminense University (UFF), Av. Gal. Milton Tavares de Souza, s/n, Niterói, RJ, 24210-346, Brazil
Rosemary Vieira
Affiliation:
Sedimentary and Environmental Processes Laboratory (LAPSA-UFF), Department of Geography, Graduate Program in Geography, Federal Fluminense University (UFF), Av. Gal. Milton Tavares de Souza, s/n, Niterói, RJ, 24210-346, Brazil
Humberto Marotta*
Affiliation:
Sedimentary and Environmental Processes Laboratory (LAPSA-UFF), Department of Geography, Graduate Program in Geography, Federal Fluminense University (UFF), Av. Gal. Milton Tavares de Souza, s/n, Niterói, RJ, 24210-346, Brazil Ecosystems and Global Change Laboratory (LEMG-UFF)/International Laboratory of Global Change (LINCGlobal), Biomass and Water Management Research Center (NAB-UFF), Graduate Program in Geosciences (Environmental Geochemistry), Federal Fluminense University (UFF), Av. Edmundo March, s/n, Niterói, RJ, 24210-310, Brazil
*
*corresponding author: humbertomarotta@id.uff.br
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Abstract

We present a high-resolution spatial study of ocean surface carbon dioxide partial pressure (pCO2), temperature and salinity coupled with a seismic survey performed in subpolar waters with a variable presence of glaciers along the coastal margins of Admiralty Bay and the Bransfield Strait, northern Antarctic Peninsula, during the late spring season. Three zones were identified in this bay. The shallow and relatively fresh SHALLOW GLACIER THAW zone in the inner portion of the bay had high freshwater inputs from active glacial meltwater channels, representing higher pCO2 levels (median ~438 μatm) than the shallow and relatively salty SHALLOW zone without glaciers along the margins and dominated by macroalgae communities at the bottom, which showed relatively low pCO2 levels (median ~371 μatm). The deep and relatively salty CENTRE zone was highly influenced by seawater intrusions from the Bransfield Strait, representing intermediate pCO2 levels (median ~397 μatm). The net sea-air CO2 fluxes in late spring obtained from the high-resolution surface survey in Admiralty Bay indicate a condition of near neutral air-sea CO2 flux, with a median (25–75% interquartile range) value of -0.07 mmol m-2 day-1 (ranging from -12.21 to +4.33 mmol m-2 day-1), contrasting with the slight source to the atmosphere estimated from measurements only in the CENTRE zone. This finding suggests that temperature-sensitive metabolic and physical-chemical processes may cause significant variability in the ocean surface distribution of CO2 over short shoreline distances in the northern Antarctic Peninsula.

Keywords

Antarctic Peninsulacarbon cycleCO2 fluxessubpolar bay
Type
Biological Sciences
Information
Antarctic Science , Volume 32 , Issue 6 , December 2020 , pp. 476 - 485
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Copyright
Copyright © Antarctic Science Ltd 2020

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