Trajectories of land and ocean primary productivity across the Arctic coastal margin and sensitivity to coastal sea ice decline
The rapidly warming Arctic and its effects on sea ice extent, hydrology, and nutrient availability influence terrestrial and marine carbon cycles in a number of interrelated ways. While these changes likely have shared effect on adjacent land and ocean systems, we often study them in isolation, maki...
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Online Access: | http://dx.doi.org/10.22541/au.169297156.69936594/v1 |
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crwinnower:10.22541/au.169297156.69936594/v1 2024-06-02T07:59:57+00:00 Trajectories of land and ocean primary productivity across the Arctic coastal margin and sensitivity to coastal sea ice decline Garcia, Cynthia Berkelhammer, Max Stock, Larry 2023 http://dx.doi.org/10.22541/au.169297156.69936594/v1 unknown Authorea, Inc. posted-content 2023 crwinnower https://doi.org/10.22541/au.169297156.69936594/v1 2024-05-07T14:19:23Z The rapidly warming Arctic and its effects on sea ice extent, hydrology, and nutrient availability influence terrestrial and marine carbon cycles in a number of interrelated ways. While these changes likely have shared effect on adjacent land and ocean systems, we often study them in isolation, making it difficult to understand response patterns and trajectories in these carbon cycle hotspots. Using almost two decades of remotely-sensed Gross Primary Productivity (GPP) in Arctic coastal margins, we test how the magnitude and direction of change in productivity covary. We observed that coastal marine productivity is four times that of coastal tundra productivity in the pan-Arctic. From 2003-2020, GPP in both the coastal land and ocean increased by approximately 12%. This common trajectory seems to be a product of increasing open water conditions, increased terrestrial water balance, and nutrient availability as driven by the regional warming. On a sectoral scale, we proposed a Coastal Synchrony Index (CSI) to compare the rate of change of ocean productivity relative to land productivity and show that ocean productivity is increasing faster than land in inflow margins of Barents, Bering, and Okhotsk, outflow margins of Canadian Arctic Archipelago (CAA) and Greenland/Iceland, and in interior margin of Eurasia. Additionally, we see strong coherence between land and ocean GPP on 4–5-year cycles illustrating that coastal synchrony observed over decadal timescales is mirrored over interannual timescales. These cycles align with variations in open water duration, emphasizing the pivotal role of reducing shorefast ice on terrestrial and marine productivity trajectories. Other/Unknown Material Arctic Archipelago Arctic Canadian Arctic Archipelago Greenland Iceland Sea ice Tundra The Winnower Arctic Canadian Arctic Archipelago Greenland Okhotsk |
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The rapidly warming Arctic and its effects on sea ice extent, hydrology, and nutrient availability influence terrestrial and marine carbon cycles in a number of interrelated ways. While these changes likely have shared effect on adjacent land and ocean systems, we often study them in isolation, making it difficult to understand response patterns and trajectories in these carbon cycle hotspots. Using almost two decades of remotely-sensed Gross Primary Productivity (GPP) in Arctic coastal margins, we test how the magnitude and direction of change in productivity covary. We observed that coastal marine productivity is four times that of coastal tundra productivity in the pan-Arctic. From 2003-2020, GPP in both the coastal land and ocean increased by approximately 12%. This common trajectory seems to be a product of increasing open water conditions, increased terrestrial water balance, and nutrient availability as driven by the regional warming. On a sectoral scale, we proposed a Coastal Synchrony Index (CSI) to compare the rate of change of ocean productivity relative to land productivity and show that ocean productivity is increasing faster than land in inflow margins of Barents, Bering, and Okhotsk, outflow margins of Canadian Arctic Archipelago (CAA) and Greenland/Iceland, and in interior margin of Eurasia. Additionally, we see strong coherence between land and ocean GPP on 4–5-year cycles illustrating that coastal synchrony observed over decadal timescales is mirrored over interannual timescales. These cycles align with variations in open water duration, emphasizing the pivotal role of reducing shorefast ice on terrestrial and marine productivity trajectories. |
format |
Other/Unknown Material |
author |
Garcia, Cynthia Berkelhammer, Max Stock, Larry |
spellingShingle |
Garcia, Cynthia Berkelhammer, Max Stock, Larry Trajectories of land and ocean primary productivity across the Arctic coastal margin and sensitivity to coastal sea ice decline |
author_facet |
Garcia, Cynthia Berkelhammer, Max Stock, Larry |
author_sort |
Garcia, Cynthia |
title |
Trajectories of land and ocean primary productivity across the Arctic coastal margin and sensitivity to coastal sea ice decline |
title_short |
Trajectories of land and ocean primary productivity across the Arctic coastal margin and sensitivity to coastal sea ice decline |
title_full |
Trajectories of land and ocean primary productivity across the Arctic coastal margin and sensitivity to coastal sea ice decline |
title_fullStr |
Trajectories of land and ocean primary productivity across the Arctic coastal margin and sensitivity to coastal sea ice decline |
title_full_unstemmed |
Trajectories of land and ocean primary productivity across the Arctic coastal margin and sensitivity to coastal sea ice decline |
title_sort |
trajectories of land and ocean primary productivity across the arctic coastal margin and sensitivity to coastal sea ice decline |
publisher |
Authorea, Inc. |
publishDate |
2023 |
url |
http://dx.doi.org/10.22541/au.169297156.69936594/v1 |
geographic |
Arctic Canadian Arctic Archipelago Greenland Okhotsk |
geographic_facet |
Arctic Canadian Arctic Archipelago Greenland Okhotsk |
genre |
Arctic Archipelago Arctic Canadian Arctic Archipelago Greenland Iceland Sea ice Tundra |
genre_facet |
Arctic Archipelago Arctic Canadian Arctic Archipelago Greenland Iceland Sea ice Tundra |
op_doi |
https://doi.org/10.22541/au.169297156.69936594/v1 |
_version_ |
1800743999444615168 |