Sea-level variability and change along the Norwegian coast between 2003 and 2018 from satellite altimetry, tide gauges, and hydrography
<p>Sea-level variations in coastal areas can differ significantly from those in the nearby open ocean. Monitoring coastal sea-level variations is therefore crucial to understand how climate variability can affect the densely populated coastal regions of the globe. In this paper, we study the s...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2022-03-01
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| Series: | Ocean Science |
| Online Access: | https://os.copernicus.org/articles/18/331/2022/os-18-331-2022.pdf |
| _version_ | 1818156116717076480 |
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| author | F. Mangini L. Chafik L. Chafik A. Bonaduce L. Bertino J. E. Ø. Nilsen |
| author_facet | F. Mangini L. Chafik L. Chafik A. Bonaduce L. Bertino J. E. Ø. Nilsen |
| author_sort | F. Mangini |
| collection | DOAJ |
| description | <p>Sea-level variations in coastal areas can differ
significantly from those in the nearby open ocean. Monitoring coastal
sea-level variations is therefore crucial to understand how climate
variability can affect the densely populated coastal regions of the globe.
In this paper, we study the sea-level variability along the coast of Norway
by means of in situ records, satellite altimetry data, and a network of
eight hydrographic stations over a period spanning 16 years (from 2003 to
2018). At first, we evaluate the performance of the ALES-reprocessed coastal
altimetry dataset (1 Hz posting rate) by comparing it with the sea-level
anomaly from tide gauges over a range of timescales, which include the
long-term trend, the annual cycle, and the detrended and deseasoned sea-level
anomaly. We find that coastal altimetry and conventional altimetry products
perform similarly along the Norwegian coast. However, the agreement with
tide gauges in terms of trends is on average 6 % better when we use the
ALES coastal altimetry data. We later assess the steric contribution to the
sea level along the Norwegian coast. While longer time series are necessary
to evaluate the steric contribution to the sea-level trends, we find that
the sea-level annual cycle is more affected by variations in temperature
than in salinity and that both temperature and salinity give a comparable
contribution to the detrended and deseasoned sea-level variability along the
entire Norwegian coast. A conclusion from our study is that coastal regions
poorly covered by tide gauges can benefit from our satellite-based approach
to study and monitor sea-level change and variability.</p> |
| first_indexed | 2024-12-11T14:53:11Z |
| format | Article |
| id | doaj.art-4ab704e63473432fa8645e4c7328f8ed |
| institution | Directory Open Access Journal |
| issn | 1812-0784 1812-0792 |
| language | English |
| last_indexed | 2024-12-11T14:53:11Z |
| publishDate | 2022-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Ocean Science |
| spelling | doaj.art-4ab704e63473432fa8645e4c7328f8ed2022-12-22T01:01:23ZengCopernicus PublicationsOcean Science1812-07841812-07922022-03-011833135910.5194/os-18-331-2022Sea-level variability and change along the Norwegian coast between 2003 and 2018 from satellite altimetry, tide gauges, and hydrographyF. Mangini0L. Chafik1L. Chafik2A. Bonaduce3L. Bertino4J. E. Ø. Nilsen5Nansen Environmental and Remote Sensing Center and Bjerknes Centre for Climate Research, Bergen, NorwayDepartment of Meteorology and Bolin Centre for Climate Research, Stockholm, SwedenNational Oceanography Centre, Southampton, UKNansen Environmental and Remote Sensing Center and Bjerknes Centre for Climate Research, Bergen, NorwayNansen Environmental and Remote Sensing Center and Bjerknes Centre for Climate Research, Bergen, NorwayInstitute of Marine Research and Bjerknes Centre for Climate Research, Bergen, Norway<p>Sea-level variations in coastal areas can differ significantly from those in the nearby open ocean. Monitoring coastal sea-level variations is therefore crucial to understand how climate variability can affect the densely populated coastal regions of the globe. In this paper, we study the sea-level variability along the coast of Norway by means of in situ records, satellite altimetry data, and a network of eight hydrographic stations over a period spanning 16 years (from 2003 to 2018). At first, we evaluate the performance of the ALES-reprocessed coastal altimetry dataset (1 Hz posting rate) by comparing it with the sea-level anomaly from tide gauges over a range of timescales, which include the long-term trend, the annual cycle, and the detrended and deseasoned sea-level anomaly. We find that coastal altimetry and conventional altimetry products perform similarly along the Norwegian coast. However, the agreement with tide gauges in terms of trends is on average 6 % better when we use the ALES coastal altimetry data. We later assess the steric contribution to the sea level along the Norwegian coast. While longer time series are necessary to evaluate the steric contribution to the sea-level trends, we find that the sea-level annual cycle is more affected by variations in temperature than in salinity and that both temperature and salinity give a comparable contribution to the detrended and deseasoned sea-level variability along the entire Norwegian coast. A conclusion from our study is that coastal regions poorly covered by tide gauges can benefit from our satellite-based approach to study and monitor sea-level change and variability.</p>https://os.copernicus.org/articles/18/331/2022/os-18-331-2022.pdf |
| spellingShingle | F. Mangini L. Chafik L. Chafik A. Bonaduce L. Bertino J. E. Ø. Nilsen Sea-level variability and change along the Norwegian coast between 2003 and 2018 from satellite altimetry, tide gauges, and hydrography Ocean Science |
| title | Sea-level variability and change along the Norwegian coast between 2003 and 2018 from satellite altimetry, tide gauges, and hydrography |
| title_full | Sea-level variability and change along the Norwegian coast between 2003 and 2018 from satellite altimetry, tide gauges, and hydrography |
| title_fullStr | Sea-level variability and change along the Norwegian coast between 2003 and 2018 from satellite altimetry, tide gauges, and hydrography |
| title_full_unstemmed | Sea-level variability and change along the Norwegian coast between 2003 and 2018 from satellite altimetry, tide gauges, and hydrography |
| title_short | Sea-level variability and change along the Norwegian coast between 2003 and 2018 from satellite altimetry, tide gauges, and hydrography |
| title_sort | sea level variability and change along the norwegian coast between 2003 and 2018 from satellite altimetry tide gauges and hydrography |
| url | https://os.copernicus.org/articles/18/331/2022/os-18-331-2022.pdf |
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