| Tittel: | The sea-level budget: an assessment of observations at the Norwegian coast | | Ansvar: | Martina Idžanović | | Forfatter: | Idžanović, Martina  | | Materialtype: | Artikkel - elektronisk | | Signatur: | Kart og plan | | Utgitt: | Bergen : Universitetsforlaget, 2020 | | Omfang: | S. 188-204 | | ISBN/ISSN: | 0447-3278 | | Serie: | Kart og plan ; 3/2020 | | Emneord: | Kyst | | Geografiske emneord: | Norge | | Innhold: | Sea level is a major indicator of climate change and thus a key essential climate variable. The source of recent sea-level rise can be understood by measuring the ocean’s temperature, salinity, mass, and sea-surface height. Based on those observations, sea-level change is determined in terms of total sea level and its two major contributions, ocean-mass and steric (density-related) sea level. The sea-level budget is closed when the sum of the independent contributions agrees with the measurements of total sea level, indicating that the observations can be used to understand recent and predict future sea-level change.
An overview of sea-level contributors at the Norwegian coast over different periods from various studies is presented. First, contributions to the sea-level budget from a global aspect are addressed, as well as observing systems used to quantify each contributor. An overview of contributors to regional sea-level change over the altimetry era (from 1993 onwards) is given along with observing systems at the Norwegian coast and their respective magnitudes.
Overall, altimetry-based rates from different studies show consistent sea-level trends. Tide-gauge values are smaller than altimetry-based values but consistent between different sources. The ocean-mass and steric contribution found in Henry et al. [13] reflect the total sea level seen by altimetry. The ocean-mass contribution from Richter et al. [11] (based on melt rates and fingerprints) and Riva et al. [15] (based on GRACE) agree well, while the ocean-mass component from Henry et al. [13] shows a value almost three times larger. The sea-level budget at the Norwegian coast is not completely understood and has potential to be improved by the availability of high-resolution data.
Keywords: Sea-level budget, steric sea level, barystatic sea level, Norwegian coast | | Del av verk: | Kart og plan 3/2020 |
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