Shipborne Comparison of Infrared and Passive Microwave Radiometers for Sea Surface Temperature Observations
In the spring of 2021, a shipborne comparison of sea surface temperature (SST) measurements was undertaken using Thermal Infrared (TIR) and Passive Microwave (PMW) radiometers. The Danish Meteorological Institute (DMI) and the Technical University of Denmark (DTU) jointly deployed two TIR and two PM...
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ftcopernicus:oai:publications.copernicus.org:egusphere118360 2024-09-15T18:14:12+00:00 Shipborne Comparison of Infrared and Passive Microwave Radiometers for Sea Surface Temperature Observations Gacitúa, Guisella Høyer, Jacob L. Søbjærg, Sten Schmidl Shi, Hoyeon Skarpalezos, Sotirios Karagali, Ioanna Alerskans, Emy Donlon, Craig 2024-03-19 application/pdf https://doi.org/10.5194/egusphere-2024-542 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-542/ eng eng doi:10.5194/egusphere-2024-542 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-542/ eISSN: Text 2024 ftcopernicus https://doi.org/10.5194/egusphere-2024-542 2024-08-28T05:24:15Z In the spring of 2021, a shipborne comparison of sea surface temperature (SST) measurements was undertaken using Thermal Infrared (TIR) and Passive Microwave (PMW) radiometers. The Danish Meteorological Institute (DMI) and the Technical University of Denmark (DTU) jointly deployed two TIR and two PMW instruments aboard the Norröna ferry, which traversed between Denmark and Iceland for a week. The primary objective was to assess the proximity-based comparison of TIR and PMW measurements, minimizing atmospheric influences and providing valuable insights into skin (TIR) and sub-skin (PMW) SSTs. A linear regression algorithm was developed using TIR SST data as a reference to derive PMW SST from brightness temperature. The data analysis primarily focused on evaluating data variability, identifying discrepancies between TIR and PMW SST, and assessing the overall uncertainty in the retrieval process. The overall root mean squared error (RMSE) of the retrieved PMW SST was 0.88 K during the ship’s motion and 0.94 K under stable conditions when the ship was moored. The analysis of the retrieved SST error budget involved the consideration of observed quantities and a forward model, accounting for factors like instrument noise, wind speed, incident angles, and the RMSE of skin and sub-skin temperature. The resulting error budget indicated 0.97 K for the data acquired during motion and 0.34 K for data collected during port stay. Text Iceland Copernicus Publications: E-Journals |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
In the spring of 2021, a shipborne comparison of sea surface temperature (SST) measurements was undertaken using Thermal Infrared (TIR) and Passive Microwave (PMW) radiometers. The Danish Meteorological Institute (DMI) and the Technical University of Denmark (DTU) jointly deployed two TIR and two PMW instruments aboard the Norröna ferry, which traversed between Denmark and Iceland for a week. The primary objective was to assess the proximity-based comparison of TIR and PMW measurements, minimizing atmospheric influences and providing valuable insights into skin (TIR) and sub-skin (PMW) SSTs. A linear regression algorithm was developed using TIR SST data as a reference to derive PMW SST from brightness temperature. The data analysis primarily focused on evaluating data variability, identifying discrepancies between TIR and PMW SST, and assessing the overall uncertainty in the retrieval process. The overall root mean squared error (RMSE) of the retrieved PMW SST was 0.88 K during the ship’s motion and 0.94 K under stable conditions when the ship was moored. The analysis of the retrieved SST error budget involved the consideration of observed quantities and a forward model, accounting for factors like instrument noise, wind speed, incident angles, and the RMSE of skin and sub-skin temperature. The resulting error budget indicated 0.97 K for the data acquired during motion and 0.34 K for data collected during port stay. |
format |
Text |
author |
Gacitúa, Guisella Høyer, Jacob L. Søbjærg, Sten Schmidl Shi, Hoyeon Skarpalezos, Sotirios Karagali, Ioanna Alerskans, Emy Donlon, Craig |
spellingShingle |
Gacitúa, Guisella Høyer, Jacob L. Søbjærg, Sten Schmidl Shi, Hoyeon Skarpalezos, Sotirios Karagali, Ioanna Alerskans, Emy Donlon, Craig Shipborne Comparison of Infrared and Passive Microwave Radiometers for Sea Surface Temperature Observations |
author_facet |
Gacitúa, Guisella Høyer, Jacob L. Søbjærg, Sten Schmidl Shi, Hoyeon Skarpalezos, Sotirios Karagali, Ioanna Alerskans, Emy Donlon, Craig |
author_sort |
Gacitúa, Guisella |
title |
Shipborne Comparison of Infrared and Passive Microwave Radiometers for Sea Surface Temperature Observations |
title_short |
Shipborne Comparison of Infrared and Passive Microwave Radiometers for Sea Surface Temperature Observations |
title_full |
Shipborne Comparison of Infrared and Passive Microwave Radiometers for Sea Surface Temperature Observations |
title_fullStr |
Shipborne Comparison of Infrared and Passive Microwave Radiometers for Sea Surface Temperature Observations |
title_full_unstemmed |
Shipborne Comparison of Infrared and Passive Microwave Radiometers for Sea Surface Temperature Observations |
title_sort |
shipborne comparison of infrared and passive microwave radiometers for sea surface temperature observations |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2024-542 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-542/ |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2024-542 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-542/ |
op_doi |
https://doi.org/10.5194/egusphere-2024-542 |
_version_ |
1810451981825736704 |