Do Cryoconite Holes Have the Potential to be Significant Sources of C, N, and P to Downstream Depauperate
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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2013
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ftuniaarhuspubl:oai:pure.atira.dk:publications/a6ba4de0-8bbb-4e50-8f52-1147c348effa 2023-09-05T13:12:41+02:00 Do Cryoconite Holes Have the Potential to be Significant Sources of C, N, and P to Downstream Depauperate Bagshaw, Liz Tranter, Martyn Fountain, Andrew Welch, Kathleen Basagic, Hassan J. Lyons, Berry 2013-11 https://pure.au.dk/portal/da/publications/do-cryoconite-holes-have-the-potential-to-be-significant-sources-of-c-n-and-p-to-downstream-depauperate(a6ba4de0-8bbb-4e50-8f52-1147c348effa).html https://doi.org/10.1657/1938-4246-45.4.440 eng eng info:eu-repo/semantics/restrictedAccess Bagshaw , L , Tranter , M , Fountain , A , Welch , K , Basagic , H J & Lyons , B 2013 , ' Do Cryoconite Holes Have the Potential to be Significant Sources of C, N, and P to Downstream Depauperate ' , Arctic, Antarctic, and Alpine Research , vol. 45 , no. 4 , pp. 440-454 . https://doi.org/10.1657/1938-4246-45.4.440 MCMURDO DRY VALLEYS SOUTHERN VICTORIA LAND GLACIAL MELTWATER STREAMS POLAR DESERT ECOSYSTEM TAYLOR VALLEY CANADA GLACIER PHOSPHATASE-ACTIVITY ORGANIC PHOSPHORUS HYPORHEIC EXCHANGE WARMING EVENTS article 2013 ftuniaarhuspubl https://doi.org/10.1657/1938-4246-45.4.440 2023-08-23T22:58:24Z 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 Canada Glacier glacier* McMurdo Dry Valleys polar desert Victoria Land Aarhus University: Research Victoria Land McMurdo Dry Valleys Canada Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Lake Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Canada Glacier ENVELOPE(162.983,162.983,-77.617,-77.617) Arctic, Antarctic, and Alpine Research 45 4 440 454 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
MCMURDO DRY VALLEYS SOUTHERN VICTORIA LAND GLACIAL MELTWATER STREAMS POLAR DESERT ECOSYSTEM TAYLOR VALLEY CANADA GLACIER PHOSPHATASE-ACTIVITY ORGANIC PHOSPHORUS HYPORHEIC EXCHANGE WARMING EVENTS |
spellingShingle |
MCMURDO DRY VALLEYS SOUTHERN VICTORIA LAND GLACIAL MELTWATER STREAMS POLAR DESERT ECOSYSTEM TAYLOR VALLEY CANADA GLACIER PHOSPHATASE-ACTIVITY ORGANIC PHOSPHORUS HYPORHEIC EXCHANGE WARMING EVENTS Bagshaw, Liz Tranter, Martyn Fountain, Andrew Welch, Kathleen Basagic, Hassan J. Lyons, Berry Do Cryoconite Holes Have the Potential to be Significant Sources of C, N, and P to Downstream Depauperate |
topic_facet |
MCMURDO DRY VALLEYS SOUTHERN VICTORIA LAND GLACIAL MELTWATER STREAMS POLAR DESERT ECOSYSTEM TAYLOR VALLEY CANADA GLACIER PHOSPHATASE-ACTIVITY ORGANIC PHOSPHORUS HYPORHEIC EXCHANGE WARMING EVENTS |
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, Liz Tranter, Martyn Fountain, Andrew Welch, Kathleen Basagic, Hassan J. Lyons, Berry |
author_facet |
Bagshaw, Liz Tranter, Martyn Fountain, Andrew Welch, Kathleen Basagic, Hassan J. Lyons, Berry |
author_sort |
Bagshaw, Liz |
title |
Do Cryoconite Holes Have the Potential to be Significant Sources of C, N, and P to Downstream Depauperate |
title_short |
Do Cryoconite Holes Have the Potential to be Significant Sources of C, N, and P to Downstream Depauperate |
title_full |
Do Cryoconite Holes Have the Potential to be Significant Sources of C, N, and P to Downstream Depauperate |
title_fullStr |
Do Cryoconite Holes Have the Potential to be Significant Sources of C, N, and P to Downstream Depauperate |
title_full_unstemmed |
Do Cryoconite Holes Have the Potential to be Significant Sources of C, N, and P to Downstream Depauperate |
title_sort |
do cryoconite holes have the potential to be significant sources of c, n, and p to downstream depauperate |
publishDate |
2013 |
url |
https://pure.au.dk/portal/da/publications/do-cryoconite-holes-have-the-potential-to-be-significant-sources-of-c-n-and-p-to-downstream-depauperate(a6ba4de0-8bbb-4e50-8f52-1147c348effa).html https://doi.org/10.1657/1938-4246-45.4.440 |
long_lat |
ENVELOPE(163.000,163.000,-77.617,-77.617) ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(162.983,162.983,-77.617,-77.617) |
geographic |
Victoria Land McMurdo Dry Valleys Canada Taylor Valley Fryxell Lake Fryxell Canada Glacier |
geographic_facet |
Victoria Land McMurdo Dry Valleys Canada Taylor Valley Fryxell Lake Fryxell Canada Glacier |
genre |
Antarc* Antarctic and Alpine Research Antarctica Arctic Canada Glacier glacier* McMurdo Dry Valleys polar desert Victoria Land |
genre_facet |
Antarc* Antarctic and Alpine Research Antarctica Arctic Canada Glacier glacier* McMurdo Dry Valleys polar desert Victoria Land |
op_source |
Bagshaw , L , Tranter , M , Fountain , A , Welch , K , Basagic , H J & Lyons , B 2013 , ' Do Cryoconite Holes Have the Potential to be Significant Sources of C, N, and P to Downstream Depauperate ' , Arctic, Antarctic, and Alpine Research , vol. 45 , no. 4 , pp. 440-454 . https://doi.org/10.1657/1938-4246-45.4.440 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
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_ |
1776201300608811008 |