Dynamic ocean topography of the northern Nordic seas: a comparison between satellite altimetry and ocean modeling
The dynamic ocean topography (DOT) of the polar seas can be described by satellite altimetry sea surface height observations combined with geoid information as well as by ocean models. The altimetry observations are characterized by an irregular sampling and seasonal sea ice coverage complicating re...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:6fa70a34c2574e878411b4dfe57804c0 2023-05-15T17:24:20+02:00 Dynamic ocean topography of the northern Nordic seas: a comparison between satellite altimetry and ocean modeling F. L. Müller C. Wekerle D. Dettmering M. Passaro W. Bosch F. Seitz 2019-02-01 https://doi.org/10.5194/tc-13-611-2019 https://www.the-cryosphere.net/13/611/2019/tc-13-611-2019.pdf https://doaj.org/article/6fa70a34c2574e878411b4dfe57804c0 en eng Copernicus Publications doi:10.5194/tc-13-611-2019 1994-0416 1994-0424 https://www.the-cryosphere.net/13/611/2019/tc-13-611-2019.pdf https://doaj.org/article/6fa70a34c2574e878411b4dfe57804c0 undefined The Cryosphere, Vol 13, Pp 611-626 (2019) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2019 fttriple https://doi.org/10.5194/tc-13-611-2019 2023-01-22T19:11:44Z The dynamic ocean topography (DOT) of the polar seas can be described by satellite altimetry sea surface height observations combined with geoid information as well as by ocean models. The altimetry observations are characterized by an irregular sampling and seasonal sea ice coverage complicating reliable DOT estimations. Models display various spatiotemporal resolutions but are limited to their computational and mathematical context and introduced forcing models. In the present paper, ALES+ retracked altimetry ranges and derived along-track DOT heights of ESA's Envisat and water heights of the Finite Element Sea Ice-Ocean Model (FESOM) are compared to investigate similarities and discrepancies. The goal of the present paper is to identify to what extent pattern and variability of the northern Nordic seas derived from measurements and model agree with each other, respectively. The study period covers the years 2003–2009. An assessment analysis regarding seasonal DOT variabilities shows good agreement and confirms the dominant impact of the annual signal in both datasets. A comparison based on estimated regional annual signal components shows 2–3 times stronger amplitudes of the observations but good agreement of the phase. Reducing both datasets by constant offsets and the annual signal reveals small regional residuals and highly correlated DOT time series (Pearson linear correlation coefficient of at least 0.67). The highest correlations can be found in areas that are ice-free and affected by ocean currents. However, differences are visible in sea-ice-covered shelf regions. Furthermore, remaining constant artificial elevations in the observational data can be attributed to an insufficient representation of the used geoid. In general, the comparison results in good agreement between simulated and altimetry-based descriptions of the DOT in the northern Nordic seas. Article in Journal/Newspaper Nordic Seas Sea ice The Cryosphere Unknown The Cryosphere 13 2 611 626 |
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English |
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geo envir F. L. Müller C. Wekerle D. Dettmering M. Passaro W. Bosch F. Seitz Dynamic ocean topography of the northern Nordic seas: a comparison between satellite altimetry and ocean modeling |
topic_facet |
geo envir |
description |
The dynamic ocean topography (DOT) of the polar seas can be described by satellite altimetry sea surface height observations combined with geoid information as well as by ocean models. The altimetry observations are characterized by an irregular sampling and seasonal sea ice coverage complicating reliable DOT estimations. Models display various spatiotemporal resolutions but are limited to their computational and mathematical context and introduced forcing models. In the present paper, ALES+ retracked altimetry ranges and derived along-track DOT heights of ESA's Envisat and water heights of the Finite Element Sea Ice-Ocean Model (FESOM) are compared to investigate similarities and discrepancies. The goal of the present paper is to identify to what extent pattern and variability of the northern Nordic seas derived from measurements and model agree with each other, respectively. The study period covers the years 2003–2009. An assessment analysis regarding seasonal DOT variabilities shows good agreement and confirms the dominant impact of the annual signal in both datasets. A comparison based on estimated regional annual signal components shows 2–3 times stronger amplitudes of the observations but good agreement of the phase. Reducing both datasets by constant offsets and the annual signal reveals small regional residuals and highly correlated DOT time series (Pearson linear correlation coefficient of at least 0.67). The highest correlations can be found in areas that are ice-free and affected by ocean currents. However, differences are visible in sea-ice-covered shelf regions. Furthermore, remaining constant artificial elevations in the observational data can be attributed to an insufficient representation of the used geoid. In general, the comparison results in good agreement between simulated and altimetry-based descriptions of the DOT in the northern Nordic seas. |
format |
Article in Journal/Newspaper |
author |
F. L. Müller C. Wekerle D. Dettmering M. Passaro W. Bosch F. Seitz |
author_facet |
F. L. Müller C. Wekerle D. Dettmering M. Passaro W. Bosch F. Seitz |
author_sort |
F. L. Müller |
title |
Dynamic ocean topography of the northern Nordic seas: a comparison between satellite altimetry and ocean modeling |
title_short |
Dynamic ocean topography of the northern Nordic seas: a comparison between satellite altimetry and ocean modeling |
title_full |
Dynamic ocean topography of the northern Nordic seas: a comparison between satellite altimetry and ocean modeling |
title_fullStr |
Dynamic ocean topography of the northern Nordic seas: a comparison between satellite altimetry and ocean modeling |
title_full_unstemmed |
Dynamic ocean topography of the northern Nordic seas: a comparison between satellite altimetry and ocean modeling |
title_sort |
dynamic ocean topography of the northern nordic seas: a comparison between satellite altimetry and ocean modeling |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-611-2019 https://www.the-cryosphere.net/13/611/2019/tc-13-611-2019.pdf https://doaj.org/article/6fa70a34c2574e878411b4dfe57804c0 |
genre |
Nordic Seas Sea ice The Cryosphere |
genre_facet |
Nordic Seas Sea ice The Cryosphere |
op_source |
The Cryosphere, Vol 13, Pp 611-626 (2019) |
op_relation |
doi:10.5194/tc-13-611-2019 1994-0416 1994-0424 https://www.the-cryosphere.net/13/611/2019/tc-13-611-2019.pdf https://doaj.org/article/6fa70a34c2574e878411b4dfe57804c0 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-13-611-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
2 |
container_start_page |
611 |
op_container_end_page |
626 |
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