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High-resolution monitoring reveals dissolved oxygen dynamics in an Antarctic cryoconite hole

High-resolution monitoring reveals dissolved oxygen dynamics in an Antarctic cryoconite hole
High-resolution monitoring reveals dissolved oxygen dynamics in an Antarctic cryoconite hole
This study presents the first high-resolution dataset of dissolved oxygen (DO) measurements in an ice-lidded cryoconite hole on Canada Glacier, McMurdo Dry Valleys, Antarctica. Fibre optic DO minisensors were installed in a cryoconite hole prior to seasonal internal melting and hydrological connection to the subsurface drainage system. Oxygen air saturation in the cryoconite hole typically ranged from 50 to 80%, in broad agreement with previous single measurements, indicating net respiration (R). This is consistent with results of simple incubation experiments performed in the field. Simultaneous time series for electrical conductivity, water temperature, and DO over the four-week study period provide information regarding the connectivity of cryoconite holes with the near-surface drainage system. The main driver of the observed variations in DO is likely to be periodic melt-freeze cycles. We conclude that automated sensing techniques, such as those described here, when used in conjunction with physical measurements, have great potential for high-resolution monitoring of the factors that perturb biogeochemical processes in cryospheric surface aquatic ecosystems.
cryoconite hole, oxygen, Antarctica, low temperature biogeochemistry
1099-1085
2868-2877
Bagshaw, E.A.
170574db-065f-4ac2-be69-f16b905a077d
Tranter, M.
a272a56a-ce28-4fa3-a4c4-1602b3ece6c1
Wadham, J.L.
45c93920-f638-49b6-8c01-3c401a12cf1e
Fountain, A.G.
96f25237-d3fd-4835-bd3e-bfe8ba401205
Mowlem, M.
6f633ca2-298f-48ee-a025-ce52dd62124f
Bagshaw, E.A.
170574db-065f-4ac2-be69-f16b905a077d
Tranter, M.
a272a56a-ce28-4fa3-a4c4-1602b3ece6c1
Wadham, J.L.
45c93920-f638-49b6-8c01-3c401a12cf1e
Fountain, A.G.
96f25237-d3fd-4835-bd3e-bfe8ba401205
Mowlem, M.
6f633ca2-298f-48ee-a025-ce52dd62124f

Bagshaw, E.A., Tranter, M., Wadham, J.L., Fountain, A.G. and Mowlem, M. (2011) High-resolution monitoring reveals dissolved oxygen dynamics in an Antarctic cryoconite hole. Hydrological Processes, 25 (18), 2868-2877. (doi:10.1002/hyp.8049).

Record type: Article

Abstract

This study presents the first high-resolution dataset of dissolved oxygen (DO) measurements in an ice-lidded cryoconite hole on Canada Glacier, McMurdo Dry Valleys, Antarctica. Fibre optic DO minisensors were installed in a cryoconite hole prior to seasonal internal melting and hydrological connection to the subsurface drainage system. Oxygen air saturation in the cryoconite hole typically ranged from 50 to 80%, in broad agreement with previous single measurements, indicating net respiration (R). This is consistent with results of simple incubation experiments performed in the field. Simultaneous time series for electrical conductivity, water temperature, and DO over the four-week study period provide information regarding the connectivity of cryoconite holes with the near-surface drainage system. The main driver of the observed variations in DO is likely to be periodic melt-freeze cycles. We conclude that automated sensing techniques, such as those described here, when used in conjunction with physical measurements, have great potential for high-resolution monitoring of the factors that perturb biogeochemical processes in cryospheric surface aquatic ecosystems.

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More information

Published date: 30 August 2011
Keywords: cryoconite hole, oxygen, Antarctica, low temperature biogeochemistry
Organisations: Ocean Technology and Engineering

Identifiers

Local EPrints ID: 197057
URI: https://eprints.soton.ac.uk/id/eprint/197057
ISSN: 1099-1085
PURE UUID: 45e8f71c-bba0-4caa-bd05-624234be123e

Catalogue record

Date deposited: 16 Sep 2011 13:04
Last modified: 16 Jul 2019 23:23

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Contributors

Author: E.A. Bagshaw
Author: M. Tranter
Author: J.L. Wadham
Author: A.G. Fountain
Author: M. Mowlem

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