World Ocean Assessment II, Chapter 05, Trends in the physical and chemical state of the ocean
KEYNOTE POINTS 1. Thermal expansion from a warming ocean and land ice melt are the main causes of the accelerating global rise in the mean sea level. 2. Global warming is also affecting many circulation systems. The Atlantic Meridional Overturning Circulation has already weakened and will most likel...
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ftieo:oai:repositorio.ieo.es:10508/12066 2023-05-15T17:52:06+02:00 World Ocean Assessment II, Chapter 05, Trends in the physical and chemical state of the ocean García-Soto, C. (Carlos) Caesar, L. (Levke) Cazenave, A. Cheng, L. Cheripka, Alicia Durack, P. J. Evans, K. (Karen) Halpern, D. Jewett, E. B. Kim, S. Y. Guancheng, L. Rigor, Ignatius Schmidtko, Sunke Wang, J. Zielinski, T. (Tymon) 2021-04-21 http://hdl.handle.net/10508/12066 eng eng United Nations Centro Oceanográfico de Santander https://www.un.org/regularprocess/sites/www.un.org.regularprocess/files/2011859-e-woa-ii-vol-i.pdf 978-92-1-1-130422-0 http://hdl.handle.net/10508/12066 The Second World Ocean Assessment. Volume I. (ed.). United Nations. New York. 2021. 570 pp: 83-110 Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess CC-BY-NC-ND world ocean assessment climate change sea level ocean circulation sea temperature ocean heat content salinity ocean acidification dissolved oxygen sea ice knowledge gaps bookPart 2021 ftieo 2022-07-26T23:49:19Z KEYNOTE POINTS 1. Thermal expansion from a warming ocean and land ice melt are the main causes of the accelerating global rise in the mean sea level. 2. Global warming is also affecting many circulation systems. The Atlantic Meridional Overturning Circulation has already weakened and will most likely continue to do so in the future. The impacts of ocean circulation changes include a regional rise in sea levels, changes in the nutrient distribution and carbon uptake of the ocean and feedbacks with the atmosphere, such as altering the distribution of precipitation. 3. More than 90 percent of the heat from global warming is stored in the global ocean. Oceans have exhibited robust warming since the 1950s from the surface to a depth of 2,000 m. The proportion of ocean heat content has more than doubled since the 1990s compared with long-term trends. Ocean warming can be seen in most of the global ocean, with a few regions exhibiting long-term cooling. 4. The ocean shows a marked pattern of salinity changes in multidecadal observations, with surface and subsurface patterns providing clear evidence of water cycle amplification over the ocean. That is manifested in enhanced salinities in the near-surface, high-salinity subtropical regions and freshening in the low-salinity regions such as the West Pacific Warm Pool and the poles. 5. An increase in atmospheric CO2 levels, and a subsequent increase in carbon in the oceans, has changed the chemistry of the oceans to include changes to pH and aragonite saturation. A more carbon-enriched marine environment, especially when coupled with other environmental stressors, has been demonstrated through field studies and experiments to have negative impacts on a wide range of organisms, in particular those that form calcium carbonate shells, and alter biodiversity and ecosystem structure. 6. Decades of oxygen observations allow for robust trend analyses. Long-term measurements have shown decreases in dissolved oxygen concentrations for most ocean regions and the expansion of ... Book Part Ocean acidification Sea ice Instituto Español de Oceanografía: e-IEO Pacific |
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Open Polar |
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Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
topic |
world ocean assessment climate change sea level ocean circulation sea temperature ocean heat content salinity ocean acidification dissolved oxygen sea ice knowledge gaps |
spellingShingle |
world ocean assessment climate change sea level ocean circulation sea temperature ocean heat content salinity ocean acidification dissolved oxygen sea ice knowledge gaps García-Soto, C. (Carlos) Caesar, L. (Levke) Cazenave, A. Cheng, L. Cheripka, Alicia Durack, P. J. Evans, K. (Karen) Halpern, D. Jewett, E. B. Kim, S. Y. Guancheng, L. Rigor, Ignatius Schmidtko, Sunke Wang, J. Zielinski, T. (Tymon) World Ocean Assessment II, Chapter 05, Trends in the physical and chemical state of the ocean |
topic_facet |
world ocean assessment climate change sea level ocean circulation sea temperature ocean heat content salinity ocean acidification dissolved oxygen sea ice knowledge gaps |
description |
KEYNOTE POINTS 1. Thermal expansion from a warming ocean and land ice melt are the main causes of the accelerating global rise in the mean sea level. 2. Global warming is also affecting many circulation systems. The Atlantic Meridional Overturning Circulation has already weakened and will most likely continue to do so in the future. The impacts of ocean circulation changes include a regional rise in sea levels, changes in the nutrient distribution and carbon uptake of the ocean and feedbacks with the atmosphere, such as altering the distribution of precipitation. 3. More than 90 percent of the heat from global warming is stored in the global ocean. Oceans have exhibited robust warming since the 1950s from the surface to a depth of 2,000 m. The proportion of ocean heat content has more than doubled since the 1990s compared with long-term trends. Ocean warming can be seen in most of the global ocean, with a few regions exhibiting long-term cooling. 4. The ocean shows a marked pattern of salinity changes in multidecadal observations, with surface and subsurface patterns providing clear evidence of water cycle amplification over the ocean. That is manifested in enhanced salinities in the near-surface, high-salinity subtropical regions and freshening in the low-salinity regions such as the West Pacific Warm Pool and the poles. 5. An increase in atmospheric CO2 levels, and a subsequent increase in carbon in the oceans, has changed the chemistry of the oceans to include changes to pH and aragonite saturation. A more carbon-enriched marine environment, especially when coupled with other environmental stressors, has been demonstrated through field studies and experiments to have negative impacts on a wide range of organisms, in particular those that form calcium carbonate shells, and alter biodiversity and ecosystem structure. 6. Decades of oxygen observations allow for robust trend analyses. Long-term measurements have shown decreases in dissolved oxygen concentrations for most ocean regions and the expansion of ... |
format |
Book Part |
author |
García-Soto, C. (Carlos) Caesar, L. (Levke) Cazenave, A. Cheng, L. Cheripka, Alicia Durack, P. J. Evans, K. (Karen) Halpern, D. Jewett, E. B. Kim, S. Y. Guancheng, L. Rigor, Ignatius Schmidtko, Sunke Wang, J. Zielinski, T. (Tymon) |
author_facet |
García-Soto, C. (Carlos) Caesar, L. (Levke) Cazenave, A. Cheng, L. Cheripka, Alicia Durack, P. J. Evans, K. (Karen) Halpern, D. Jewett, E. B. Kim, S. Y. Guancheng, L. Rigor, Ignatius Schmidtko, Sunke Wang, J. Zielinski, T. (Tymon) |
author_sort |
García-Soto, C. (Carlos) |
title |
World Ocean Assessment II, Chapter 05, Trends in the physical and chemical state of the ocean |
title_short |
World Ocean Assessment II, Chapter 05, Trends in the physical and chemical state of the ocean |
title_full |
World Ocean Assessment II, Chapter 05, Trends in the physical and chemical state of the ocean |
title_fullStr |
World Ocean Assessment II, Chapter 05, Trends in the physical and chemical state of the ocean |
title_full_unstemmed |
World Ocean Assessment II, Chapter 05, Trends in the physical and chemical state of the ocean |
title_sort |
world ocean assessment ii, chapter 05, trends in the physical and chemical state of the ocean |
publisher |
United Nations |
publishDate |
2021 |
url |
http://hdl.handle.net/10508/12066 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ocean acidification Sea ice |
genre_facet |
Ocean acidification Sea ice |
op_relation |
https://www.un.org/regularprocess/sites/www.un.org.regularprocess/files/2011859-e-woa-ii-vol-i.pdf 978-92-1-1-130422-0 http://hdl.handle.net/10508/12066 The Second World Ocean Assessment. Volume I. (ed.). United Nations. New York. 2021. 570 pp: 83-110 |
op_rights |
Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766159440630775808 |