Dissolved organic nutrients dominate melting surface ice of the Dark Zone (Greenland Ice Sheet)

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Standard

Dissolved organic nutrients dominate melting surface ice of the Dark Zone (Greenland Ice Sheet). / Holland, Alexandra T.; Williamson, Christopher J.; Sgouridis, Fotis; Tedstone, Andrew J.; McCutcheon, Jenine; Cook, Joseph M.; Poniecka, Ewa; Yallop, Marian L.; Tranter, Martyn; Anesio, Alexandre M.

I: Biogeosciences, Bind 16, Nr. 16, 2019, s. 3283-3296.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Harvard

Holland, AT, Williamson, CJ, Sgouridis, F, Tedstone, AJ, McCutcheon, J, Cook, JM, Poniecka, E, Yallop, ML, Tranter, M & Anesio, AM 2019, 'Dissolved organic nutrients dominate melting surface ice of the Dark Zone (Greenland Ice Sheet)', Biogeosciences, bind 16, nr. 16, s. 3283-3296. https://doi.org/10.5194/bg-16-3283-2019

APA

Holland, A. T., Williamson, C. J., Sgouridis, F., Tedstone, A. J., McCutcheon, J., Cook, J. M., Poniecka, E., Yallop, M. L., Tranter, M., & Anesio, A. M. (2019). Dissolved organic nutrients dominate melting surface ice of the Dark Zone (Greenland Ice Sheet). Biogeosciences, 16(16), 3283-3296. https://doi.org/10.5194/bg-16-3283-2019

CBE

Holland AT, Williamson CJ, Sgouridis F, Tedstone AJ, McCutcheon J, Cook JM, Poniecka E, Yallop ML, Tranter M, Anesio AM. 2019. Dissolved organic nutrients dominate melting surface ice of the Dark Zone (Greenland Ice Sheet). Biogeosciences. 16(16):3283-3296. https://doi.org/10.5194/bg-16-3283-2019

MLA

Vancouver

Holland AT, Williamson CJ, Sgouridis F, Tedstone AJ, McCutcheon J, Cook JM o.a. Dissolved organic nutrients dominate melting surface ice of the Dark Zone (Greenland Ice Sheet). Biogeosciences. 2019;16(16):3283-3296. https://doi.org/10.5194/bg-16-3283-2019

Author

Holland, Alexandra T. ; Williamson, Christopher J. ; Sgouridis, Fotis ; Tedstone, Andrew J. ; McCutcheon, Jenine ; Cook, Joseph M. ; Poniecka, Ewa ; Yallop, Marian L. ; Tranter, Martyn ; Anesio, Alexandre M. / Dissolved organic nutrients dominate melting surface ice of the Dark Zone (Greenland Ice Sheet). I: Biogeosciences. 2019 ; Bind 16, Nr. 16. s. 3283-3296.

Bibtex

@article{f7651c9b486541d184386c28de60e25a,
title = "Dissolved organic nutrients dominate melting surface ice of the Dark Zone (Greenland Ice Sheet)",
abstract = "Glaciers and ice sheets host abundant and dynamic communities of microorganisms on the ice surface (supraglacial environments). Recently, it has been shown that Streptophyte glacier algae blooming on the surface ice of the south-western coast of the Greenland Ice Sheet are a significant contributor to the 15-year marked decrease in albedo. Currently, little is known about the constraints, such as nutrient availability, on this large-scale algal bloom. In this study, we investigate the relative abundances of dissolved inorganic and dissolved organic macronutrients (N and P) in these darkening surface ice environments. Three distinct ice surfaces, with low, medium and high visible impurity loadings, supraglacial stream water and cryoconite hole water, were sampled. Our results show a clear dominance of the organic phase in all ice surface samples containing low, medium and high visible impurity loadings, with 93% of the total dissolved nitrogen and 67% of the total dissolved phosphorus in the organic phase. Mean concentrations in low, medium and high visible impurity surface ice environments are 0.91, 0.62 and 1.0μM for dissolved inorganic nitrogen (DIN), 5.1, 11 and 14μM for dissolved organic nitrogen (DON), 0.03, 0.07 and 0.05μM for dissolved inorganic phosphorus (DIP) and 0.10, 0.15 and 0.12μM for dissolved organic phosphorus (DOP), respectively. DON concentrations in all three surface ice samples are significantly higher than DON concentrations in supraglacial streams and cryoconite hole water (0 and 0.7 μM, respectively). DOP concentrations are higher in all three surface ice samples compared to supraglacial streams and cryoconite hole water (0.07μM for both). Dissolved organic carbon (DOC) concentrations increase with the amount of visible impurities present (low: 83 μM, medium: 173μM and high: 242 μM) and are elevated compared to supraglacial streams and cryoconite hole water (30 and 50 μM, respectively). We speculate that the architecture of the weathering crust, which impacts on water flow paths and storage in the melting surface ice and/or the production of extracellular polymeric substances (EPS), containing both N and P in conjunction with C, is responsible for the temporary retention of DON and DOP in the melting surface ice. The unusual presence of measurable DIP and DIN, principally as NHC 4 , in the melting surface ice environments suggests that factors other than macronutrient limitation are controlling the extent and magnitude of the glacier algae.",
author = "Holland, {Alexandra T.} and Williamson, {Christopher J.} and Fotis Sgouridis and Tedstone, {Andrew J.} and Jenine McCutcheon and Cook, {Joseph M.} and Ewa Poniecka and Yallop, {Marian L.} and Martyn Tranter and Anesio, {Alexandre M.}",
year = "2019",
doi = "10.5194/bg-16-3283-2019",
language = "English",
volume = "16",
pages = "3283--3296",
journal = "Biogeosciences",
issn = "1726-4170",
publisher = "Copernicus GmbH",
number = "16",

}

RIS

TY - JOUR

T1 - Dissolved organic nutrients dominate melting surface ice of the Dark Zone (Greenland Ice Sheet)

AU - Holland, Alexandra T.

AU - Williamson, Christopher J.

AU - Sgouridis, Fotis

AU - Tedstone, Andrew J.

AU - McCutcheon, Jenine

AU - Cook, Joseph M.

AU - Poniecka, Ewa

AU - Yallop, Marian L.

AU - Tranter, Martyn

AU - Anesio, Alexandre M.

PY - 2019

Y1 - 2019

N2 - Glaciers and ice sheets host abundant and dynamic communities of microorganisms on the ice surface (supraglacial environments). Recently, it has been shown that Streptophyte glacier algae blooming on the surface ice of the south-western coast of the Greenland Ice Sheet are a significant contributor to the 15-year marked decrease in albedo. Currently, little is known about the constraints, such as nutrient availability, on this large-scale algal bloom. In this study, we investigate the relative abundances of dissolved inorganic and dissolved organic macronutrients (N and P) in these darkening surface ice environments. Three distinct ice surfaces, with low, medium and high visible impurity loadings, supraglacial stream water and cryoconite hole water, were sampled. Our results show a clear dominance of the organic phase in all ice surface samples containing low, medium and high visible impurity loadings, with 93% of the total dissolved nitrogen and 67% of the total dissolved phosphorus in the organic phase. Mean concentrations in low, medium and high visible impurity surface ice environments are 0.91, 0.62 and 1.0μM for dissolved inorganic nitrogen (DIN), 5.1, 11 and 14μM for dissolved organic nitrogen (DON), 0.03, 0.07 and 0.05μM for dissolved inorganic phosphorus (DIP) and 0.10, 0.15 and 0.12μM for dissolved organic phosphorus (DOP), respectively. DON concentrations in all three surface ice samples are significantly higher than DON concentrations in supraglacial streams and cryoconite hole water (0 and 0.7 μM, respectively). DOP concentrations are higher in all three surface ice samples compared to supraglacial streams and cryoconite hole water (0.07μM for both). Dissolved organic carbon (DOC) concentrations increase with the amount of visible impurities present (low: 83 μM, medium: 173μM and high: 242 μM) and are elevated compared to supraglacial streams and cryoconite hole water (30 and 50 μM, respectively). We speculate that the architecture of the weathering crust, which impacts on water flow paths and storage in the melting surface ice and/or the production of extracellular polymeric substances (EPS), containing both N and P in conjunction with C, is responsible for the temporary retention of DON and DOP in the melting surface ice. The unusual presence of measurable DIP and DIN, principally as NHC 4 , in the melting surface ice environments suggests that factors other than macronutrient limitation are controlling the extent and magnitude of the glacier algae.

AB - Glaciers and ice sheets host abundant and dynamic communities of microorganisms on the ice surface (supraglacial environments). Recently, it has been shown that Streptophyte glacier algae blooming on the surface ice of the south-western coast of the Greenland Ice Sheet are a significant contributor to the 15-year marked decrease in albedo. Currently, little is known about the constraints, such as nutrient availability, on this large-scale algal bloom. In this study, we investigate the relative abundances of dissolved inorganic and dissolved organic macronutrients (N and P) in these darkening surface ice environments. Three distinct ice surfaces, with low, medium and high visible impurity loadings, supraglacial stream water and cryoconite hole water, were sampled. Our results show a clear dominance of the organic phase in all ice surface samples containing low, medium and high visible impurity loadings, with 93% of the total dissolved nitrogen and 67% of the total dissolved phosphorus in the organic phase. Mean concentrations in low, medium and high visible impurity surface ice environments are 0.91, 0.62 and 1.0μM for dissolved inorganic nitrogen (DIN), 5.1, 11 and 14μM for dissolved organic nitrogen (DON), 0.03, 0.07 and 0.05μM for dissolved inorganic phosphorus (DIP) and 0.10, 0.15 and 0.12μM for dissolved organic phosphorus (DOP), respectively. DON concentrations in all three surface ice samples are significantly higher than DON concentrations in supraglacial streams and cryoconite hole water (0 and 0.7 μM, respectively). DOP concentrations are higher in all three surface ice samples compared to supraglacial streams and cryoconite hole water (0.07μM for both). Dissolved organic carbon (DOC) concentrations increase with the amount of visible impurities present (low: 83 μM, medium: 173μM and high: 242 μM) and are elevated compared to supraglacial streams and cryoconite hole water (30 and 50 μM, respectively). We speculate that the architecture of the weathering crust, which impacts on water flow paths and storage in the melting surface ice and/or the production of extracellular polymeric substances (EPS), containing both N and P in conjunction with C, is responsible for the temporary retention of DON and DOP in the melting surface ice. The unusual presence of measurable DIP and DIN, principally as NHC 4 , in the melting surface ice environments suggests that factors other than macronutrient limitation are controlling the extent and magnitude of the glacier algae.

UR - http://www.scopus.com/inward/record.url?scp=85071781076&partnerID=8YFLogxK

U2 - 10.5194/bg-16-3283-2019

DO - 10.5194/bg-16-3283-2019

M3 - Journal article

AN - SCOPUS:85071781076

VL - 16

SP - 3283

EP - 3296

JO - Biogeosciences

JF - Biogeosciences

SN - 1726-4170

IS - 16

ER -