Objective analyses of hydrographic data for referencing profiling float salinities in highly variable environments
The development of a broad-scale array of about 3000 autonomous profiling floats, known as Argo, has been underway since 2000. This array will deliver up to 100,000 vertical profiles of temperature, salinity and other parameters from the surface to depths up to 2000 m. While floats are expected to g...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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ftoceanrep:oai:oceanrep.geomar.de:4534 2023-05-15T17:30:51+02:00 Objective analyses of hydrographic data for referencing profiling float salinities in highly variable environments Böhme, Lars Send, Uwe 2005 text https://oceanrep.geomar.de/id/eprint/4534/ https://oceanrep.geomar.de/id/eprint/4534/1/1-s2.0-S0967064504003133-main.pdf https://oceanrep.geomar.de/id/eprint/4534/2/1-s2.0-S0967064505002985-main.pdf https://doi.org/10.1016/j.dsr2.2004.12.014 en eng Elsevier https://oceanrep.geomar.de/id/eprint/4534/1/1-s2.0-S0967064504003133-main.pdf https://oceanrep.geomar.de/id/eprint/4534/2/1-s2.0-S0967064505002985-main.pdf Böhme, L. and Send, U. (2005) Objective analyses of hydrographic data for referencing profiling float salinities in highly variable environments. Deep Sea Research Part II: Topical Studies in Oceanography, 52 (3-4). pp. 651-664. DOI 10.1016/j.dsr2.2004.12.014 <https://doi.org/10.1016/j.dsr2.2004.12.014>. doi:10.1016/j.dsr2.2004.12.014 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2005 ftoceanrep https://doi.org/10.1016/j.dsr2.2004.12.014 2023-04-07T14:49:43Z The development of a broad-scale array of about 3000 autonomous profiling floats, known as Argo, has been underway since 2000. This array will deliver up to 100,000 vertical profiles of temperature, salinity and other parameters from the surface to depths up to 2000 m. While floats are expected to give good measurements of temperature and pressure, salinity measurements sometimes show significant sensor drift with time or offsets. Unless a float is recovered before the battery fails, recalibrations cannot be performed and a remote calibration method is required. Such a quality control system has been set up for the North Atlantic to identify and correct salinity sensor drifts by using historical hydrographic data. An objective mapping method is used that takes the spatial and temporal variations in water mass properties into account. These scales aim to represent the hydrographic structure of the North Atlantic, which follow the large-scale contours of the potential vorticity. The float measurements of each profile are compared to the mapped salinities in potential conductivity space by weighted least-squares, giving one correction for each profile. It is assumed that any conductivity offset changes slowly over time, so that a linear fit of the profile based corrections over the float time series is done. The result is a set of calibrated salinity data with corresponding uncertainties. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Deep Sea Research Part II: Topical Studies in Oceanography 52 3-4 651 664 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
The development of a broad-scale array of about 3000 autonomous profiling floats, known as Argo, has been underway since 2000. This array will deliver up to 100,000 vertical profiles of temperature, salinity and other parameters from the surface to depths up to 2000 m. While floats are expected to give good measurements of temperature and pressure, salinity measurements sometimes show significant sensor drift with time or offsets. Unless a float is recovered before the battery fails, recalibrations cannot be performed and a remote calibration method is required. Such a quality control system has been set up for the North Atlantic to identify and correct salinity sensor drifts by using historical hydrographic data. An objective mapping method is used that takes the spatial and temporal variations in water mass properties into account. These scales aim to represent the hydrographic structure of the North Atlantic, which follow the large-scale contours of the potential vorticity. The float measurements of each profile are compared to the mapped salinities in potential conductivity space by weighted least-squares, giving one correction for each profile. It is assumed that any conductivity offset changes slowly over time, so that a linear fit of the profile based corrections over the float time series is done. The result is a set of calibrated salinity data with corresponding uncertainties. |
format |
Article in Journal/Newspaper |
author |
Böhme, Lars Send, Uwe |
spellingShingle |
Böhme, Lars Send, Uwe Objective analyses of hydrographic data for referencing profiling float salinities in highly variable environments |
author_facet |
Böhme, Lars Send, Uwe |
author_sort |
Böhme, Lars |
title |
Objective analyses of hydrographic data for referencing profiling float salinities in highly variable environments |
title_short |
Objective analyses of hydrographic data for referencing profiling float salinities in highly variable environments |
title_full |
Objective analyses of hydrographic data for referencing profiling float salinities in highly variable environments |
title_fullStr |
Objective analyses of hydrographic data for referencing profiling float salinities in highly variable environments |
title_full_unstemmed |
Objective analyses of hydrographic data for referencing profiling float salinities in highly variable environments |
title_sort |
objective analyses of hydrographic data for referencing profiling float salinities in highly variable environments |
publisher |
Elsevier |
publishDate |
2005 |
url |
https://oceanrep.geomar.de/id/eprint/4534/ https://oceanrep.geomar.de/id/eprint/4534/1/1-s2.0-S0967064504003133-main.pdf https://oceanrep.geomar.de/id/eprint/4534/2/1-s2.0-S0967064505002985-main.pdf https://doi.org/10.1016/j.dsr2.2004.12.014 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/4534/1/1-s2.0-S0967064504003133-main.pdf https://oceanrep.geomar.de/id/eprint/4534/2/1-s2.0-S0967064505002985-main.pdf Böhme, L. and Send, U. (2005) Objective analyses of hydrographic data for referencing profiling float salinities in highly variable environments. Deep Sea Research Part II: Topical Studies in Oceanography, 52 (3-4). pp. 651-664. DOI 10.1016/j.dsr2.2004.12.014 <https://doi.org/10.1016/j.dsr2.2004.12.014>. doi:10.1016/j.dsr2.2004.12.014 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.dsr2.2004.12.014 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
52 |
container_issue |
3-4 |
container_start_page |
651 |
op_container_end_page |
664 |
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