Influence of glacier type on bloom phenology in two Southwest Greenland fjords
Along Greenland's coastline, the magnitude and timing of primary production in fjords is influenced by meltwater release from marine-terminating glaciers. How local ecosystems will adapt as these glaciers retreat onto land, forcing fundamental changes in hydrography, remains an open question. T...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/427470 2023-11-12T04:00:40+01:00 Influence of glacier type on bloom phenology in two Southwest Greenland fjords Stuart-Lee, A.E. Mortensen, J. Juul-Pedersen, T. Middelburg, J.j. Soetaert, K. Hopwood, M.j. Engel, A. Meire, L. Geochemistry 2023-05-05 application/pdf https://dspace.library.uu.nl/handle/1874/427470 en eng 0272-7714 https://dspace.library.uu.nl/handle/1874/427470 info:eu-repo/semantics/OpenAccess Carbon Climate-change Discharge Dynamics Godthabsfjord Ice-sheet Nutrient Phytoplankton Productivity Succession Article 2023 ftunivutrecht 2023-11-01T23:30:16Z Along Greenland's coastline, the magnitude and timing of primary production in fjords is influenced by meltwater release from marine-terminating glaciers. How local ecosystems will adapt as these glaciers retreat onto land, forcing fundamental changes in hydrography, remains an open question. To further our understanding of this transition, we examine how marine- and land-terminating glaciers respectively influence fjord bloom phenology. Between spring and autumn 2019, we conducted along-fjord transects of hydrographic variables, biogeochemical properties and pico- and nanophytoplankton counts to illustrate the contrasting seasonal bloom dynamics in the fjords Nuup Kangerlua and Ameralik. These fjords are in the same climatic region of west Greenland but influenced by different glacial structures. Nuup Kangerlua, a predominantly marine-terminating system, was differentiated by its sustained second summer bloom and high Chl a fluorescence in summer and autumn. In Ameralik, influenced by a land-terminating glacier, we found higher abundances of pico- and nanophytoplankton, and high cyanobacteria growth in autumn. The summer bloom in Nuup Kangerlua is known to be coincident with subglacial freshwater discharge sustaining renewed nutrient supply to the fjord. We observe here that the intermediate baroclinic circulation, which creates an inflow at subsurface depths, also plays an important role in increasing nutrient availability at shallower depths and potentially explains the distribution of primary producers. Our observations suggest that the retreat of marine-terminating glaciers onto land, with consequent increases in surface water temperature and stratification, and reduced light availability, may alter the magnitude, composition, and distribution of summer productivity. Article in Journal/Newspaper Ameralik glacier Greenland Ice Sheet Utrecht University Repository Ameralik ENVELOPE(-51.000,-51.000,64.117,64.117) Greenland |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Carbon Climate-change Discharge Dynamics Godthabsfjord Ice-sheet Nutrient Phytoplankton Productivity Succession |
spellingShingle |
Carbon Climate-change Discharge Dynamics Godthabsfjord Ice-sheet Nutrient Phytoplankton Productivity Succession Stuart-Lee, A.E. Mortensen, J. Juul-Pedersen, T. Middelburg, J.j. Soetaert, K. Hopwood, M.j. Engel, A. Meire, L. Influence of glacier type on bloom phenology in two Southwest Greenland fjords |
topic_facet |
Carbon Climate-change Discharge Dynamics Godthabsfjord Ice-sheet Nutrient Phytoplankton Productivity Succession |
description |
Along Greenland's coastline, the magnitude and timing of primary production in fjords is influenced by meltwater release from marine-terminating glaciers. How local ecosystems will adapt as these glaciers retreat onto land, forcing fundamental changes in hydrography, remains an open question. To further our understanding of this transition, we examine how marine- and land-terminating glaciers respectively influence fjord bloom phenology. Between spring and autumn 2019, we conducted along-fjord transects of hydrographic variables, biogeochemical properties and pico- and nanophytoplankton counts to illustrate the contrasting seasonal bloom dynamics in the fjords Nuup Kangerlua and Ameralik. These fjords are in the same climatic region of west Greenland but influenced by different glacial structures. Nuup Kangerlua, a predominantly marine-terminating system, was differentiated by its sustained second summer bloom and high Chl a fluorescence in summer and autumn. In Ameralik, influenced by a land-terminating glacier, we found higher abundances of pico- and nanophytoplankton, and high cyanobacteria growth in autumn. The summer bloom in Nuup Kangerlua is known to be coincident with subglacial freshwater discharge sustaining renewed nutrient supply to the fjord. We observe here that the intermediate baroclinic circulation, which creates an inflow at subsurface depths, also plays an important role in increasing nutrient availability at shallower depths and potentially explains the distribution of primary producers. Our observations suggest that the retreat of marine-terminating glaciers onto land, with consequent increases in surface water temperature and stratification, and reduced light availability, may alter the magnitude, composition, and distribution of summer productivity. |
author2 |
Geochemistry |
format |
Article in Journal/Newspaper |
author |
Stuart-Lee, A.E. Mortensen, J. Juul-Pedersen, T. Middelburg, J.j. Soetaert, K. Hopwood, M.j. Engel, A. Meire, L. |
author_facet |
Stuart-Lee, A.E. Mortensen, J. Juul-Pedersen, T. Middelburg, J.j. Soetaert, K. Hopwood, M.j. Engel, A. Meire, L. |
author_sort |
Stuart-Lee, A.E. |
title |
Influence of glacier type on bloom phenology in two Southwest Greenland fjords |
title_short |
Influence of glacier type on bloom phenology in two Southwest Greenland fjords |
title_full |
Influence of glacier type on bloom phenology in two Southwest Greenland fjords |
title_fullStr |
Influence of glacier type on bloom phenology in two Southwest Greenland fjords |
title_full_unstemmed |
Influence of glacier type on bloom phenology in two Southwest Greenland fjords |
title_sort |
influence of glacier type on bloom phenology in two southwest greenland fjords |
publishDate |
2023 |
url |
https://dspace.library.uu.nl/handle/1874/427470 |
long_lat |
ENVELOPE(-51.000,-51.000,64.117,64.117) |
geographic |
Ameralik Greenland |
geographic_facet |
Ameralik Greenland |
genre |
Ameralik glacier Greenland Ice Sheet |
genre_facet |
Ameralik glacier Greenland Ice Sheet |
op_relation |
0272-7714 https://dspace.library.uu.nl/handle/1874/427470 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782328419380363264 |