The importance of regional sea-ice variability for the coastal climate and near-surface temperature gradients in Northeast Greenland
The climate in Northeast Greenland is shaped by complex topography and interaction with the cryosphere. Since the regional ecosystem processes are sensitive to atmospheric stability conditions, it is crucial to capture this complexity including adequate cryosphere coupling. This study uses an observ...
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ftcopernicus:oai:publications.copernicus.org:wcd109197 2023-10-01T03:55:42+02:00 The importance of regional sea-ice variability for the coastal climate and near-surface temperature gradients in Northeast Greenland Shahi, Sonika Abermann, Jakob Silva, Tiago Langley, Kirsty Larsen, Signe Hillerup Mastepanov, Mikhail Schöner, Wolfgang 2023-09-01 application/pdf https://doi.org/10.5194/wcd-4-747-2023 https://wcd.copernicus.org/articles/4/747/2023/ eng eng doi:10.5194/wcd-4-747-2023 https://wcd.copernicus.org/articles/4/747/2023/ eISSN: 2698-4016 Text 2023 ftcopernicus https://doi.org/10.5194/wcd-4-747-2023 2023-09-04T16:24:18Z The climate in Northeast Greenland is shaped by complex topography and interaction with the cryosphere. Since the regional ecosystem processes are sensitive to atmospheric stability conditions, it is crucial to capture this complexity including adequate cryosphere coupling. This study uses an observational dataset from the Zackenberg region (Northeast Greenland) to investigate the local- and large-scale factors that determine the slope temperature gradient (STG), i.e., the temperature gradient along the mountain slope. A synthesis of automated weather stations, reanalysis, and a regional climate model simulations was used. For all seasons, our results show that snow cover and near-fjord ice conditions are the dominating factors governing the temporal evolution of the STG in the Zackenberg region. Considering large-scale drivers of the STG, we find that temperature inversions are associated with positive 500 hPa geopotential height and surface pressure anomalies over East Greenland. A strong connection between fractional sea-ice cover (SIF) in the Greenland Sea and the terrestrial climate of the Zackenberg region is found. A positive SIF anomaly coincides with a shallow STG, i.e., more positive (inversions) or less negative than the mean STG, since the temperature at the bottom of the valley decreases more than at the top. For example, the mean STG varies by ∼4 ∘ C km −1 for a corresponding ∼27 % change in SIF. Reduction in temperature and precipitation (snowfall) during the days with high sea ice also affects the surface mass balance (SMB) of nearby glaciers and ice caps as shown for the A. P. Olsen Ice Cap. During summer, days with high SIF are associated with a positive SMB anomaly in the ablation area ( ∼16 mm w.e. d −1 indicating less melt) and a negative anomaly in the accumulation area ( ∼ - 0.3 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="35pt" height="10pt" class="svg-formula" dspmath="mathimg" md5hash="5189700a89afa8659794a5519dc7e70e"><svg:image ... Text East Greenland Greenland Greenland Sea Ice cap Sea ice Zackenberg Copernicus Publications: E-Journals Greenland Weather and Climate Dynamics 4 3 747 771 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The climate in Northeast Greenland is shaped by complex topography and interaction with the cryosphere. Since the regional ecosystem processes are sensitive to atmospheric stability conditions, it is crucial to capture this complexity including adequate cryosphere coupling. This study uses an observational dataset from the Zackenberg region (Northeast Greenland) to investigate the local- and large-scale factors that determine the slope temperature gradient (STG), i.e., the temperature gradient along the mountain slope. A synthesis of automated weather stations, reanalysis, and a regional climate model simulations was used. For all seasons, our results show that snow cover and near-fjord ice conditions are the dominating factors governing the temporal evolution of the STG in the Zackenberg region. Considering large-scale drivers of the STG, we find that temperature inversions are associated with positive 500 hPa geopotential height and surface pressure anomalies over East Greenland. A strong connection between fractional sea-ice cover (SIF) in the Greenland Sea and the terrestrial climate of the Zackenberg region is found. A positive SIF anomaly coincides with a shallow STG, i.e., more positive (inversions) or less negative than the mean STG, since the temperature at the bottom of the valley decreases more than at the top. For example, the mean STG varies by ∼4 ∘ C km −1 for a corresponding ∼27 % change in SIF. Reduction in temperature and precipitation (snowfall) during the days with high sea ice also affects the surface mass balance (SMB) of nearby glaciers and ice caps as shown for the A. P. Olsen Ice Cap. During summer, days with high SIF are associated with a positive SMB anomaly in the ablation area ( ∼16 mm w.e. d −1 indicating less melt) and a negative anomaly in the accumulation area ( ∼ - 0.3 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="35pt" height="10pt" class="svg-formula" dspmath="mathimg" md5hash="5189700a89afa8659794a5519dc7e70e"><svg:image ... |
format |
Text |
author |
Shahi, Sonika Abermann, Jakob Silva, Tiago Langley, Kirsty Larsen, Signe Hillerup Mastepanov, Mikhail Schöner, Wolfgang |
spellingShingle |
Shahi, Sonika Abermann, Jakob Silva, Tiago Langley, Kirsty Larsen, Signe Hillerup Mastepanov, Mikhail Schöner, Wolfgang The importance of regional sea-ice variability for the coastal climate and near-surface temperature gradients in Northeast Greenland |
author_facet |
Shahi, Sonika Abermann, Jakob Silva, Tiago Langley, Kirsty Larsen, Signe Hillerup Mastepanov, Mikhail Schöner, Wolfgang |
author_sort |
Shahi, Sonika |
title |
The importance of regional sea-ice variability for the coastal climate and near-surface temperature gradients in Northeast Greenland |
title_short |
The importance of regional sea-ice variability for the coastal climate and near-surface temperature gradients in Northeast Greenland |
title_full |
The importance of regional sea-ice variability for the coastal climate and near-surface temperature gradients in Northeast Greenland |
title_fullStr |
The importance of regional sea-ice variability for the coastal climate and near-surface temperature gradients in Northeast Greenland |
title_full_unstemmed |
The importance of regional sea-ice variability for the coastal climate and near-surface temperature gradients in Northeast Greenland |
title_sort |
importance of regional sea-ice variability for the coastal climate and near-surface temperature gradients in northeast greenland |
publishDate |
2023 |
url |
https://doi.org/10.5194/wcd-4-747-2023 https://wcd.copernicus.org/articles/4/747/2023/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland Greenland Sea Ice cap Sea ice Zackenberg |
genre_facet |
East Greenland Greenland Greenland Sea Ice cap Sea ice Zackenberg |
op_source |
eISSN: 2698-4016 |
op_relation |
doi:10.5194/wcd-4-747-2023 https://wcd.copernicus.org/articles/4/747/2023/ |
op_doi |
https://doi.org/10.5194/wcd-4-747-2023 |
container_title |
Weather and Climate Dynamics |
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4 |
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3 |
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747 |
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771 |
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