On the quality of hydrographic data collected in the Southern Ocean by instrumented elephant seals
International audience To study the foraging ecology of elephant seals in relation to oceanographic conditions, Satellite-Relayed Data Loggers (SRDL) with an integrated Conductivity-Temperature-Depth (CTD) have been developped by the Sea Mammal Research Unit (University of St Andrews), which autonom...
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Format: | Conference Object |
Language: | English |
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HAL CCSD
2009
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Online Access: | https://hal.science/hal-04113678 |
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ftccsdartic:oai:HAL:hal-04113678v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Roquet, Fabien Charrassin, Jean-Benoit Park, Young-Hyang Fedak, M. Biuw, M. Boehme, L. Guinet, Christophe On the quality of hydrographic data collected in the Southern Ocean by instrumented elephant seals |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience To study the foraging ecology of elephant seals in relation to oceanographic conditions, Satellite-Relayed Data Loggers (SRDL) with an integrated Conductivity-Temperature-Depth (CTD) have been developped by the Sea Mammal Research Unit (University of St Andrews), which autonomously collect and transmit hydrographic profiles (temperature/salinity) in near-real time via Argos satellites. These devices have the potential to provide detailed oceanographic information in logistically difficult areas at comparatively low cost, being therefore highly interesting for the oceanographic community as well. Large efforts for calibrating and validating the huge amount of collected hydrographic data have been constantly made since the first deployments in 2004, as a necessary step to produce data useful for oceanography. When possible, at-sea experiments were performed on ships of opportunity before deployments on seals, consisting in comparing hydrographic profiles from SRDLs with reference profiles obtained simultaneously with a standard CTD. These experiments brought to light a satisfying repeatability of SRDL sensors but also the presence of systematic biases, especially for salinity, which should be corrected. In 2007 and 2008, more than 6000 valid temperature/salinity (T/S) profiles were collected by 17 SRDLs around the Kerguelen Islands in the Southern Indian Ocean. We present several delayed-mode methods of estimation and reduction of systematic biases, applied to this peculiar seal dataset. These methods are based on comparisons of T/S profiles from SRDLs with available historical profiles (mainly CTD and ARGO profiles) or with each other (cross-comparisons). Based on this two-fold procedure, we show here the important technical and methodological improvements made since 2004 to produce hydrographic data suitable for oceanographic studies. |
author2 |
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Roquet, Fabien Charrassin, Jean-Benoit Park, Young-Hyang Fedak, M. Biuw, M. Boehme, L. Guinet, Christophe |
author_facet |
Roquet, Fabien Charrassin, Jean-Benoit Park, Young-Hyang Fedak, M. Biuw, M. Boehme, L. Guinet, Christophe |
author_sort |
Roquet, Fabien |
title |
On the quality of hydrographic data collected in the Southern Ocean by instrumented elephant seals |
title_short |
On the quality of hydrographic data collected in the Southern Ocean by instrumented elephant seals |
title_full |
On the quality of hydrographic data collected in the Southern Ocean by instrumented elephant seals |
title_fullStr |
On the quality of hydrographic data collected in the Southern Ocean by instrumented elephant seals |
title_full_unstemmed |
On the quality of hydrographic data collected in the Southern Ocean by instrumented elephant seals |
title_sort |
on the quality of hydrographic data collected in the southern ocean by instrumented elephant seals |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-04113678 |
op_coverage |
Vienna, Austria |
geographic |
Southern Ocean Kerguelen Kerguelen Islands Indian |
geographic_facet |
Southern Ocean Kerguelen Kerguelen Islands Indian |
genre |
Elephant Seals Kerguelen Islands Southern Ocean |
genre_facet |
Elephant Seals Kerguelen Islands Southern Ocean |
op_source |
EGU General Assembly 2009 https://hal.science/hal-04113678 EGU General Assembly 2009, Apr 2009, Vienna, Austria. pp.8895 |
op_relation |
hal-04113678 https://hal.science/hal-04113678 BIBCODE: 2009EGUGA.11.8895R |
_version_ |
1792047286950297600 |
spelling |
ftccsdartic:oai:HAL:hal-04113678v1 2024-02-27T08:40:11+00:00 On the quality of hydrographic data collected in the Southern Ocean by instrumented elephant seals Roquet, Fabien Charrassin, Jean-Benoit Park, Young-Hyang Fedak, M. Biuw, M. Boehme, L. Guinet, Christophe Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Vienna, Austria 2009-04-19 https://hal.science/hal-04113678 en eng HAL CCSD hal-04113678 https://hal.science/hal-04113678 BIBCODE: 2009EGUGA.11.8895R EGU General Assembly 2009 https://hal.science/hal-04113678 EGU General Assembly 2009, Apr 2009, Vienna, Austria. pp.8895 [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/conferenceObject Conference papers 2009 ftccsdartic 2024-01-28T00:44:33Z International audience To study the foraging ecology of elephant seals in relation to oceanographic conditions, Satellite-Relayed Data Loggers (SRDL) with an integrated Conductivity-Temperature-Depth (CTD) have been developped by the Sea Mammal Research Unit (University of St Andrews), which autonomously collect and transmit hydrographic profiles (temperature/salinity) in near-real time via Argos satellites. These devices have the potential to provide detailed oceanographic information in logistically difficult areas at comparatively low cost, being therefore highly interesting for the oceanographic community as well. Large efforts for calibrating and validating the huge amount of collected hydrographic data have been constantly made since the first deployments in 2004, as a necessary step to produce data useful for oceanography. When possible, at-sea experiments were performed on ships of opportunity before deployments on seals, consisting in comparing hydrographic profiles from SRDLs with reference profiles obtained simultaneously with a standard CTD. These experiments brought to light a satisfying repeatability of SRDL sensors but also the presence of systematic biases, especially for salinity, which should be corrected. In 2007 and 2008, more than 6000 valid temperature/salinity (T/S) profiles were collected by 17 SRDLs around the Kerguelen Islands in the Southern Indian Ocean. We present several delayed-mode methods of estimation and reduction of systematic biases, applied to this peculiar seal dataset. These methods are based on comparisons of T/S profiles from SRDLs with available historical profiles (mainly CTD and ARGO profiles) or with each other (cross-comparisons). Based on this two-fold procedure, we show here the important technical and methodological improvements made since 2004 to produce hydrographic data suitable for oceanographic studies. Conference Object Elephant Seals Kerguelen Islands Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Southern Ocean Kerguelen Kerguelen Islands Indian |