Global and Full-depth Ocean Temperature Trends during the early 21 st century from Argo and Repeat Hydrography
International audience The early 21st century’s warming trend of the full-depth global ocean is calculated by combining the analysis of Argo (top 2000m) and repeat hydrography into a blended full-depth observing system. The surface-to-bottom temperature change over the last decade of sustained obser...
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ftinsu:oai:HAL:hal-04201796v1 2024-04-14T08:15:41+00:00 Global and Full-depth Ocean Temperature Trends during the early 21 st century from Argo and Repeat Hydrography Desbruyeres, Damien Mcdonagh, Elaine L. King, Brian A. Thierry, Virginie Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2017-03 https://hal.science/hal-04201796 https://hal.science/hal-04201796/document https://hal.science/hal-04201796/file/clim-jcli-d-16-0396.1.pdf https://doi.org/10.1175/JCLI-D-16-0396.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JCLI-D-16-0396.1 hal-04201796 https://hal.science/hal-04201796 https://hal.science/hal-04201796/document https://hal.science/hal-04201796/file/clim-jcli-d-16-0396.1.pdf doi:10.1175/JCLI-D-16-0396.1 info:eu-repo/semantics/OpenAccess ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-04201796 Journal of Climate, 2017, 30 (6), pp.1985-1997. ⟨10.1175/JCLI-D-16-0396.1⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2017 ftinsu https://doi.org/10.1175/JCLI-D-16-0396.1 2024-03-21T17:06:29Z International audience The early 21st century’s warming trend of the full-depth global ocean is calculated by combining the analysis of Argo (top 2000m) and repeat hydrography into a blended full-depth observing system. The surface-to-bottom temperature change over the last decade of sustained observation is equivalent to a heat uptake of 0.72 ± 0.09 W m−2 applied over the surface of the earth, 90% of it being found above 2000m depth. We decompose the temperature trend point-wise into changes in isopycnal depth (heave) and temperature changes along an isopycnal (spiciness) to describe the mechanisms controlling the variability. The heave component dominates the global heat content increase, with the largest trends found in the southern hemisphere’s extratropics (0 - 2000m) highlighting a volumetric increase of subtropical mode waters. Significant heave-related warming is also found in the deep North Atlantic and Southern Ocean (2000m - 4000m), reflecting a potential decrease in deep water mass renewal rates. The spiciness component shows its strongest contribution at intermediate levels (700m - 2000m), with striking localised warming signals in regions of intense vertical mixing (North Atlantic and Southern oceans). Finally, the agreement between the independent Argo and repeat hydrography temperature changes at 2000m provides an overall good confidence in the blended heat content evaluation on global and ocean scales, but also highlights basin scale discrepancies between the two independent estimates. Those mismatches are largest in those basins with the largest heave signature (Southern Ocean) and reflect both the temporal and spatial sparseness of the hydrography sampling. Article in Journal/Newspaper North Atlantic Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Southern Ocean Journal of Climate 30 6 1985 1997 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Desbruyeres, Damien Mcdonagh, Elaine L. King, Brian A. Thierry, Virginie Global and Full-depth Ocean Temperature Trends during the early 21 st century from Argo and Repeat Hydrography |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience The early 21st century’s warming trend of the full-depth global ocean is calculated by combining the analysis of Argo (top 2000m) and repeat hydrography into a blended full-depth observing system. The surface-to-bottom temperature change over the last decade of sustained observation is equivalent to a heat uptake of 0.72 ± 0.09 W m−2 applied over the surface of the earth, 90% of it being found above 2000m depth. We decompose the temperature trend point-wise into changes in isopycnal depth (heave) and temperature changes along an isopycnal (spiciness) to describe the mechanisms controlling the variability. The heave component dominates the global heat content increase, with the largest trends found in the southern hemisphere’s extratropics (0 - 2000m) highlighting a volumetric increase of subtropical mode waters. Significant heave-related warming is also found in the deep North Atlantic and Southern Ocean (2000m - 4000m), reflecting a potential decrease in deep water mass renewal rates. The spiciness component shows its strongest contribution at intermediate levels (700m - 2000m), with striking localised warming signals in regions of intense vertical mixing (North Atlantic and Southern oceans). Finally, the agreement between the independent Argo and repeat hydrography temperature changes at 2000m provides an overall good confidence in the blended heat content evaluation on global and ocean scales, but also highlights basin scale discrepancies between the two independent estimates. Those mismatches are largest in those basins with the largest heave signature (Southern Ocean) and reflect both the temporal and spatial sparseness of the hydrography sampling. |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Desbruyeres, Damien Mcdonagh, Elaine L. King, Brian A. Thierry, Virginie |
author_facet |
Desbruyeres, Damien Mcdonagh, Elaine L. King, Brian A. Thierry, Virginie |
author_sort |
Desbruyeres, Damien |
title |
Global and Full-depth Ocean Temperature Trends during the early 21 st century from Argo and Repeat Hydrography |
title_short |
Global and Full-depth Ocean Temperature Trends during the early 21 st century from Argo and Repeat Hydrography |
title_full |
Global and Full-depth Ocean Temperature Trends during the early 21 st century from Argo and Repeat Hydrography |
title_fullStr |
Global and Full-depth Ocean Temperature Trends during the early 21 st century from Argo and Repeat Hydrography |
title_full_unstemmed |
Global and Full-depth Ocean Temperature Trends during the early 21 st century from Argo and Repeat Hydrography |
title_sort |
global and full-depth ocean temperature trends during the early 21 st century from argo and repeat hydrography |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-04201796 https://hal.science/hal-04201796/document https://hal.science/hal-04201796/file/clim-jcli-d-16-0396.1.pdf https://doi.org/10.1175/JCLI-D-16-0396.1 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-04201796 Journal of Climate, 2017, 30 (6), pp.1985-1997. ⟨10.1175/JCLI-D-16-0396.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JCLI-D-16-0396.1 hal-04201796 https://hal.science/hal-04201796 https://hal.science/hal-04201796/document https://hal.science/hal-04201796/file/clim-jcli-d-16-0396.1.pdf doi:10.1175/JCLI-D-16-0396.1 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JCLI-D-16-0396.1 |
container_title |
Journal of Climate |
container_volume |
30 |
container_issue |
6 |
container_start_page |
1985 |
op_container_end_page |
1997 |
_version_ |
1796314105423855616 |