Meltwater Discharge From Marine-Terminating Glaciers Drives Biogeochemical Conditions in a Greenlandic Fjord
An increasing body of work has shown the potential impacts of subglacial discharge from marine-terminating glaciers on the marine environment around Greenland. Upwelling of nutrients associated with rising buoyant plumes near the front of marine-terminating glaciers plays a key role in maintaining t...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/89113 2023-06-11T04:11:55+02:00 Meltwater Discharge From Marine-Terminating Glaciers Drives Biogeochemical Conditions in a Greenlandic Fjord Kanna, Naoya Sugiyama, Shin Ando, Takuto Wang, Yefan Sakuragi, Yuta Hazumi, Toya Matsuno, Kohei Yamaguchi, Atsushi Nishioka, Jun Yamashita, Youhei http://hdl.handle.net/2115/89113 https://doi.org/10.1029/2022GB007411 eng eng American Geophysical Union http://hdl.handle.net/2115/89113 Global Biogeochemical Cycles, 36(11): e2022GB007411 http://dx.doi.org/10.1029/2022GB007411 Copyright 2022 American Geophysical Union. trace metals nutrients dissolved organic matter protists glacier Greenland 452 article fthokunivhus https://doi.org/10.1029/2022GB007411 2023-05-05T00:04:52Z An increasing body of work has shown the potential impacts of subglacial discharge from marine-terminating glaciers on the marine environment around Greenland. Upwelling of nutrients associated with rising buoyant plumes near the front of marine-terminating glaciers plays a key role in maintaining the high productivity of connected fjords. The response of protist communities to subglacial discharges into fjords nevertheless remains poorly understood. Here we show data of water properties, nutrients, and protist communities during two summers in 2018 and 2019 in a Greenlandic fjord system fed by marine-terminating glaciers. This study included the period of intense summer melting of the Greenland Ice Sheet in 2019. The data revealed high nutrient concentrations in 2019 that were attributed to intensified upwelling of nutrients and dissolved iron into the subsurface layer. The source of the iron and the nutrients was subglacial discharge and deep fjord water, respectively. Intense glacial discharges in 2019 mitigated nitrate and phosphate limitations of phytoplankton in the fjord and resulted in an increase of chlorophyll a in the subsurface layer and growth of large diatoms. Heterotrophic protists such as dinoflagellates, tintinnids, and nanoflagellates were more abundant in the summer of 2019. We concluded that nutrient upwelling by subglacial discharges was the major driver of the structure of lower trophic levels in fjord ecosystems. We hypothesize that the more intense melting of glaciers and related increase in subglacial discharge will enhance nutrient upwelling, and increased summer productivity in fjords until the glaciers retreat and terminate on land. Article in Journal/Newspaper glacier Greenland greenlandic Ice Sheet Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Greenland Global Biogeochemical Cycles 36 11 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
trace metals nutrients dissolved organic matter protists glacier Greenland 452 |
spellingShingle |
trace metals nutrients dissolved organic matter protists glacier Greenland 452 Kanna, Naoya Sugiyama, Shin Ando, Takuto Wang, Yefan Sakuragi, Yuta Hazumi, Toya Matsuno, Kohei Yamaguchi, Atsushi Nishioka, Jun Yamashita, Youhei Meltwater Discharge From Marine-Terminating Glaciers Drives Biogeochemical Conditions in a Greenlandic Fjord |
topic_facet |
trace metals nutrients dissolved organic matter protists glacier Greenland 452 |
description |
An increasing body of work has shown the potential impacts of subglacial discharge from marine-terminating glaciers on the marine environment around Greenland. Upwelling of nutrients associated with rising buoyant plumes near the front of marine-terminating glaciers plays a key role in maintaining the high productivity of connected fjords. The response of protist communities to subglacial discharges into fjords nevertheless remains poorly understood. Here we show data of water properties, nutrients, and protist communities during two summers in 2018 and 2019 in a Greenlandic fjord system fed by marine-terminating glaciers. This study included the period of intense summer melting of the Greenland Ice Sheet in 2019. The data revealed high nutrient concentrations in 2019 that were attributed to intensified upwelling of nutrients and dissolved iron into the subsurface layer. The source of the iron and the nutrients was subglacial discharge and deep fjord water, respectively. Intense glacial discharges in 2019 mitigated nitrate and phosphate limitations of phytoplankton in the fjord and resulted in an increase of chlorophyll a in the subsurface layer and growth of large diatoms. Heterotrophic protists such as dinoflagellates, tintinnids, and nanoflagellates were more abundant in the summer of 2019. We concluded that nutrient upwelling by subglacial discharges was the major driver of the structure of lower trophic levels in fjord ecosystems. We hypothesize that the more intense melting of glaciers and related increase in subglacial discharge will enhance nutrient upwelling, and increased summer productivity in fjords until the glaciers retreat and terminate on land. |
format |
Article in Journal/Newspaper |
author |
Kanna, Naoya Sugiyama, Shin Ando, Takuto Wang, Yefan Sakuragi, Yuta Hazumi, Toya Matsuno, Kohei Yamaguchi, Atsushi Nishioka, Jun Yamashita, Youhei |
author_facet |
Kanna, Naoya Sugiyama, Shin Ando, Takuto Wang, Yefan Sakuragi, Yuta Hazumi, Toya Matsuno, Kohei Yamaguchi, Atsushi Nishioka, Jun Yamashita, Youhei |
author_sort |
Kanna, Naoya |
title |
Meltwater Discharge From Marine-Terminating Glaciers Drives Biogeochemical Conditions in a Greenlandic Fjord |
title_short |
Meltwater Discharge From Marine-Terminating Glaciers Drives Biogeochemical Conditions in a Greenlandic Fjord |
title_full |
Meltwater Discharge From Marine-Terminating Glaciers Drives Biogeochemical Conditions in a Greenlandic Fjord |
title_fullStr |
Meltwater Discharge From Marine-Terminating Glaciers Drives Biogeochemical Conditions in a Greenlandic Fjord |
title_full_unstemmed |
Meltwater Discharge From Marine-Terminating Glaciers Drives Biogeochemical Conditions in a Greenlandic Fjord |
title_sort |
meltwater discharge from marine-terminating glaciers drives biogeochemical conditions in a greenlandic fjord |
publisher |
American Geophysical Union |
url |
http://hdl.handle.net/2115/89113 https://doi.org/10.1029/2022GB007411 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland greenlandic Ice Sheet |
genre_facet |
glacier Greenland greenlandic Ice Sheet |
op_relation |
http://hdl.handle.net/2115/89113 Global Biogeochemical Cycles, 36(11): e2022GB007411 http://dx.doi.org/10.1029/2022GB007411 |
op_rights |
Copyright 2022 American Geophysical Union. |
op_doi |
https://doi.org/10.1029/2022GB007411 |
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Global Biogeochemical Cycles |
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