Do cryoconite holes have the potential to be significant sources of C, N, and P to downstream depauperate ecosystems of Taylor Valley, Antarctica?
Nutrient recycling occurs in hydrologically isolated cryoconite holes on the glaciers of the McMurdo Dry Valleys, Antarctica. Biogeochemical processes enrich the cryoconite holes with solute and nutrients compared to the source sediment and glacier ice. The position of the glacier within the landsca...
Published in: | Arctic, Antarctic, and Alpine Research |
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University of Colorado at Boulder, Institute of Arctic and Alpine Research
2013
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/63000/ https://doi.org/10.1657/1938-4246-45.4.440 |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:63000 2023-05-15T13:38:47+02:00 Do cryoconite holes have the potential to be significant sources of C, N, and P to downstream depauperate ecosystems of Taylor Valley, Antarctica? Bagshaw, Elizabeth Tranter, Martyn Fountain, Andrew G. Welch, Kathleen Basagic, Hassan J. Lyons, W. Berry 2013-11 https://orca.cardiff.ac.uk/id/eprint/63000/ https://doi.org/10.1657/1938-4246-45.4.440 unknown University of Colorado at Boulder, Institute of Arctic and Alpine Research Bagshaw, Elizabeth https://orca.cardiff.ac.uk/view/cardiffauthors/A1991811U.html orcid:0000-0001-8392-1750 orcid:0000-0001-8392-1750, Tranter, Martyn, Fountain, Andrew G., Welch, Kathleen, Basagic, Hassan J. and Lyons, W. Berry 2013. Do cryoconite holes have the potential to be significant sources of C, N, and P to downstream depauperate ecosystems of Taylor Valley, Antarctica? Arctic, Antarctic, and Alpine Research 45 (4) , pp. 440-454. 10.1657/1938-4246-45.4.440 https://doi.org/10.1657/1938-4246-45.4.440 doi:10.1657/1938-4246-45.4.440 Article PeerReviewed 2013 ftunivcardiff https://doi.org/10.1657/1938-4246-45.4.440 2022-10-27T22:39:47Z Nutrient recycling occurs in hydrologically isolated cryoconite holes on the glaciers of the McMurdo Dry Valleys, Antarctica. Biogeochemical processes enrich the cryoconite holes with solute and nutrients compared to the source sediment and glacier ice. The position of the glacier within the landscape affects the physical and biogeochemical character of the cryoconite holes, with those found in more biologically productive areas of the valley having higher concentrations of C., N, and P and higher pH. Comprehensive assessment of the quality and quantity of bioavailable C, N, and P shows that the cryoconite holes represent a significant store of nutrient in this depauperate landscape, since the total mass of C and N is similar to that found in the ephemeral streams. The dissolved nutrients within the holes, and a significant proportion of the particulate store, are released to the valley ecosystem via the network of ephemeral streams and perennially ice-covered lakes as a result of hydrological connection with the supraglacial drainage system. In most cases, cryoconite holes are flushed every several years, but during warm periods which occur with near decadal frequency, all holes connect and flush their contents off the glaciers. Simple mass balance modeling shows that an increase in primary productivity observed in Lake Fryxell that followed such a melt event in 2001/2002 can be explained by an influx of nutrients (specifically N) generated in the cryoconite holes. These features are hence an integral part of the Dry Valley ecosystem and should be considered in models of downstream biological processes. Article in Journal/Newspaper Antarc* Antarctic and Alpine Research Antarctica Arctic McMurdo Dry Valleys Cardiff University: ORCA (Online Research @ Cardiff) Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Lake Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) McMurdo Dry Valleys Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) Arctic, Antarctic, and Alpine Research 45 4 440 454 |
institution |
Open Polar |
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Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
unknown |
description |
Nutrient recycling occurs in hydrologically isolated cryoconite holes on the glaciers of the McMurdo Dry Valleys, Antarctica. Biogeochemical processes enrich the cryoconite holes with solute and nutrients compared to the source sediment and glacier ice. The position of the glacier within the landscape affects the physical and biogeochemical character of the cryoconite holes, with those found in more biologically productive areas of the valley having higher concentrations of C., N, and P and higher pH. Comprehensive assessment of the quality and quantity of bioavailable C, N, and P shows that the cryoconite holes represent a significant store of nutrient in this depauperate landscape, since the total mass of C and N is similar to that found in the ephemeral streams. The dissolved nutrients within the holes, and a significant proportion of the particulate store, are released to the valley ecosystem via the network of ephemeral streams and perennially ice-covered lakes as a result of hydrological connection with the supraglacial drainage system. In most cases, cryoconite holes are flushed every several years, but during warm periods which occur with near decadal frequency, all holes connect and flush their contents off the glaciers. Simple mass balance modeling shows that an increase in primary productivity observed in Lake Fryxell that followed such a melt event in 2001/2002 can be explained by an influx of nutrients (specifically N) generated in the cryoconite holes. These features are hence an integral part of the Dry Valley ecosystem and should be considered in models of downstream biological processes. |
format |
Article in Journal/Newspaper |
author |
Bagshaw, Elizabeth Tranter, Martyn Fountain, Andrew G. Welch, Kathleen Basagic, Hassan J. Lyons, W. Berry |
spellingShingle |
Bagshaw, Elizabeth Tranter, Martyn Fountain, Andrew G. Welch, Kathleen Basagic, Hassan J. Lyons, W. Berry Do cryoconite holes have the potential to be significant sources of C, N, and P to downstream depauperate ecosystems of Taylor Valley, Antarctica? |
author_facet |
Bagshaw, Elizabeth Tranter, Martyn Fountain, Andrew G. Welch, Kathleen Basagic, Hassan J. Lyons, W. Berry |
author_sort |
Bagshaw, Elizabeth |
title |
Do cryoconite holes have the potential to be significant sources of C, N, and P to downstream depauperate ecosystems of Taylor Valley, Antarctica? |
title_short |
Do cryoconite holes have the potential to be significant sources of C, N, and P to downstream depauperate ecosystems of Taylor Valley, Antarctica? |
title_full |
Do cryoconite holes have the potential to be significant sources of C, N, and P to downstream depauperate ecosystems of Taylor Valley, Antarctica? |
title_fullStr |
Do cryoconite holes have the potential to be significant sources of C, N, and P to downstream depauperate ecosystems of Taylor Valley, Antarctica? |
title_full_unstemmed |
Do cryoconite holes have the potential to be significant sources of C, N, and P to downstream depauperate ecosystems of Taylor Valley, Antarctica? |
title_sort |
do cryoconite holes have the potential to be significant sources of c, n, and p to downstream depauperate ecosystems of taylor valley, antarctica? |
publisher |
University of Colorado at Boulder, Institute of Arctic and Alpine Research |
publishDate |
2013 |
url |
https://orca.cardiff.ac.uk/id/eprint/63000/ https://doi.org/10.1657/1938-4246-45.4.440 |
long_lat |
ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(163.000,163.000,-77.617,-77.617) |
geographic |
Fryxell Lake Fryxell McMurdo Dry Valleys Taylor Valley |
geographic_facet |
Fryxell Lake Fryxell McMurdo Dry Valleys Taylor Valley |
genre |
Antarc* Antarctic and Alpine Research Antarctica Arctic McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic and Alpine Research Antarctica Arctic McMurdo Dry Valleys |
op_relation |
Bagshaw, Elizabeth https://orca.cardiff.ac.uk/view/cardiffauthors/A1991811U.html orcid:0000-0001-8392-1750 orcid:0000-0001-8392-1750, Tranter, Martyn, Fountain, Andrew G., Welch, Kathleen, Basagic, Hassan J. and Lyons, W. Berry 2013. Do cryoconite holes have the potential to be significant sources of C, N, and P to downstream depauperate ecosystems of Taylor Valley, Antarctica? Arctic, Antarctic, and Alpine Research 45 (4) , pp. 440-454. 10.1657/1938-4246-45.4.440 https://doi.org/10.1657/1938-4246-45.4.440 doi:10.1657/1938-4246-45.4.440 |
op_doi |
https://doi.org/10.1657/1938-4246-45.4.440 |
container_title |
Arctic, Antarctic, and Alpine Research |
container_volume |
45 |
container_issue |
4 |
container_start_page |
440 |
op_container_end_page |
454 |
_version_ |
1766111105661272064 |