[1] The cryoconite holes of the McMurdo Dry Valleys are simple, closed biogeochemical systems involving water, ice, mineral and organic debris, which serve as ecosystems for consortia of microorganisms. This study is the first to document the seasonal and annual chemical evolution of solutes in cryo...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.568.8958 2023-05-15T17:10:35+02:00 Citation Bagshaw M. Tranter A. G. Fountain K. A. Welch H. Basagic W. B. Lyons Biogeochemical Evolution The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.568.8958 http://glaciers.pdx.edu/fountain/MyPapers/BagshawEtAL2008_BiogeochemicalCryoconiteHoles.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.568.8958 http://glaciers.pdx.edu/fountain/MyPapers/BagshawEtAL2008_BiogeochemicalCryoconiteHoles.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://glaciers.pdx.edu/fountain/MyPapers/BagshawEtAL2008_BiogeochemicalCryoconiteHoles.pdf text ftciteseerx 2016-01-08T12:23:45Z [1] The cryoconite holes of the McMurdo Dry Valleys are simple, closed biogeochemical systems involving water, ice, mineral and organic debris, which serve as ecosystems for consortia of microorganisms. This study is the first to document the seasonal and annual chemical evolution of solutes in cryoconite holes. Samples of glacier ice, frozen cryoconite holes and those containing water were collected during the austral summer of 2005–2006. The isolation age was calculated from the excess Cl in the holes, and varied from 0 to 5 years (a), consistent with the last hot summer when the cryoconite holes were open to the atmosphere. The holes progressively deepen with isolation age. Variations in DIC, DOC, K+ and SO4 2 suggest that dissolution of primary minerals in the cryoconite debris, cyclical precipitation and dissolution of secondary carbonates, net photosynthesis over summer and net respiration during the autumnal freeze are the principal reactions which perturb the seasonal and annual solute concentrations in the holes. DOC is generated in the holes at a rate of 7.5 mg C cm2 a1, and non-sea-salt K+ accumulates in frozen holes at a rate of 0.073 meq cm2 a1. We infer that C cycling is complex even in these otherwise simple systems. Text McMurdo Dry Valleys Unknown Austral McMurdo Dry Valleys |
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English |
description |
[1] The cryoconite holes of the McMurdo Dry Valleys are simple, closed biogeochemical systems involving water, ice, mineral and organic debris, which serve as ecosystems for consortia of microorganisms. This study is the first to document the seasonal and annual chemical evolution of solutes in cryoconite holes. Samples of glacier ice, frozen cryoconite holes and those containing water were collected during the austral summer of 2005–2006. The isolation age was calculated from the excess Cl in the holes, and varied from 0 to 5 years (a), consistent with the last hot summer when the cryoconite holes were open to the atmosphere. The holes progressively deepen with isolation age. Variations in DIC, DOC, K+ and SO4 2 suggest that dissolution of primary minerals in the cryoconite debris, cyclical precipitation and dissolution of secondary carbonates, net photosynthesis over summer and net respiration during the autumnal freeze are the principal reactions which perturb the seasonal and annual solute concentrations in the holes. DOC is generated in the holes at a rate of 7.5 mg C cm2 a1, and non-sea-salt K+ accumulates in frozen holes at a rate of 0.073 meq cm2 a1. We infer that C cycling is complex even in these otherwise simple systems. |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Citation Bagshaw M. Tranter A. G. Fountain K. A. Welch H. Basagic W. B. Lyons Biogeochemical Evolution |
spellingShingle |
Citation Bagshaw M. Tranter A. G. Fountain K. A. Welch H. Basagic W. B. Lyons Biogeochemical Evolution |
author_facet |
Citation Bagshaw M. Tranter A. G. Fountain K. A. Welch H. Basagic W. B. Lyons Biogeochemical Evolution |
author_sort |
Citation Bagshaw |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.568.8958 http://glaciers.pdx.edu/fountain/MyPapers/BagshawEtAL2008_BiogeochemicalCryoconiteHoles.pdf |
geographic |
Austral McMurdo Dry Valleys |
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Austral McMurdo Dry Valleys |
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McMurdo Dry Valleys |
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McMurdo Dry Valleys |
op_source |
http://glaciers.pdx.edu/fountain/MyPapers/BagshawEtAL2008_BiogeochemicalCryoconiteHoles.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.568.8958 http://glaciers.pdx.edu/fountain/MyPapers/BagshawEtAL2008_BiogeochemicalCryoconiteHoles.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766067215445000192 |