DUACS DT2021 reprocessed altimetry improves sea level retrieval in the coastal band of the European seas
<p>More than 29 years of altimeter data have been recently reprocessed by the multi-satellite Data Unification and Altimeter Combination System (DUACS) and made available under the name of DT2021 through the Copernicus Marine Service (CMEMS) and the Copernicus Climate Change Service (C3S). New...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2023-06-01
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| Series: | Ocean Science |
| Online Access: | https://os.copernicus.org/articles/19/793/2023/os-19-793-2023.pdf |
| Summary: | <p>More than 29 years of altimeter data have been recently
reprocessed by the multi-satellite Data Unification and Altimeter
Combination System (DUACS) and made available under the name of DT2021 through the Copernicus Marine Service (CMEMS) and the Copernicus
Climate Change Service (C3S). New standards have been applied and various
geophysical correction parameters have been updated compared to the previous
release in order to improve the product quality.</p>
<p>This paper describes the assessment of this new release through the
comparison of both the <i>all satellites</i> and the <i>two satellites</i> product with external in situ tide gauge
measurements in the coastal areas of the European seas for a time period
from 1 January 1993 to 31 May 2020. The aim is to quantify the
improvements on the previous DT2018 processing version for the retrieval of
sea level in the coastal zone.</p>
<p>The results confirmed that the CMEMS product in the new DT2021 processing
version better solves the signal in the coastal band. The <i>all satellites</i> dataset showed a
reduction of 3 % in errors when compared with tide gauges and of 5 % in
the variance of the differences between the datasets compared to DT2018
reprocessing. Moreover, the <i>all satellites</i> dataset provided more accurate sea level
measurements when making a comparison with tide gauges with respect to the climatic <i>two satellites</i>
dataset due to the better performance of the former for the assessment of
higher than climatic frequency signals. By contrast, the <i>two satellite</i> dataset is the
most suitable product for the assessment of long-term sea level sea surface height (SSH) trends
in the coastal zone due to its larger stability to the detriment of the <i>all satellites</i>
dataset.</p> |
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| ISSN: | 1812-0784 1812-0792 |