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The effects of global warming on the coupled Ocean-Atmosphere Hydrothermohaline circulation
Stockholm University, Faculty of Science, Department of Meteorology .
Stockholm University, Faculty of Science, Department of Meteorology .
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Global warming will have an impact on the hydrological cycle affecting both the atmospheric and oceanic circulation. In this study we analyse these impacts from a thermodynamic perspective using streamfunctions defined in general thermodynamic coordinates. Both the atmospheric and oceanic circulation showed a weakening of the circulation in a future scenario but an expansion in both humidity and salinity directions. The Clausius-Clapeyron relationship is hence here extended to not only to give a relationship between air temperature and moisture but also with the sea-surface salinity. As a consequence, not only the atmospheric hydrothermal circulation, but also the oceanic thermohaline circulation, will follow the Clausius-Clapeyron relationship as climate warms up. This results in a direct relationship between the increase of atmospheric moisture and an increase of the ocean salinity as a consequence of the changes in the freshwater forcing at the sea surface.

National Category
Earth and Related Environmental Sciences
Research subject
Atmospheric Sciences and Oceanography
Identifiers
URN: urn:nbn:se:su:diva-172839OAI: oai:DiVA.org:su-172839DiVA, id: diva2:1350169
Available from: 2019-09-10 Created: 2019-09-10 Last updated: 2019-09-11Bibliographically approved
In thesis
1. Atmospheric and oceanic circulation from a thermodynamic perspective
Open this publication in new window or tab >>Atmospheric and oceanic circulation from a thermodynamic perspective
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The climate system is continuously transporting and exchanging heat, freshwater, carbon and other tracers in different spatio-temporal scales. Therefore, analysing the system from a thermodynamic or biogeochemical framework is highly convenient. In this thesis the interaction between the ocean and the atmospheric circulation is analysed using thermodynamical and biogeochemical coordinates. Due to the dimensionality of the climate system stream functions are used to reduce this complexity and facilitate the understanding of the different processes that take place. The first half of this thesis, focuses on the interaction between the atmospheric and the ocean circulation from a thermodynamic perspective. We introduce the hydrothermohaline stream function which combines the atmospheric circulation in humidity-potential temperature (hydrothermal) space and the ocean circulation in salinity-temperature coordinates (thermohaline). A scale factor of 7.1 is proposed to link humidity and salinity coordinates. Future scenarios are showing an increase of humidity in the atmosphere due to the increase of temperatures which results in a widening of the hydrothermal stream function along the humidity coordinate. In a similar way, the ocean circulation in the thermohaline space expands along the salinity coordinate. The link between salinity and humidity changes is strongest at net evaporation regions where the gain of water vapour in the atmosphere results in a salinification in the ocean. In addition, the ocean circulation in latitude-carbon space is investigated. By doing so, we are able to distinguish the roles of different water masses and circulation pathways for ocean carbon. We find that the surface waters in the subtropical gyres are the main drivers of the meridional carbon transport in the ocean. By separating the carbon in its different constituents we show that the carbon transported by the majority of the water masses is a result of the solubility pump. The contribution of the biological pump is predominant in the deep Pacific Ocean. The effects of the Mediterranean Overflow Waters on the North Atlantic are discussed in the final part of the thesis.

Place, publisher, year, edition, pages
Stockholm: Department of Meteorology, Stockholm University, 2019. p. 28
Keywords
Atmospheric circulation, Ocean circulation, Stream functions
National Category
Climate Research Meteorology and Atmospheric Sciences Oceanography, Hydrology and Water Resources
Research subject
Atmospheric Sciences and Oceanography
Identifiers
urn:nbn:se:su:diva-172842 (URN)978-91-7797-827-5 (ISBN)978-91-7797-828-2 (ISBN)
Public defence
2019-10-24, De Geersalen, Svante Arrhenius väg 14, Stockolm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Manuscript. Paper 4: Manuscript.

Available from: 2019-10-01 Created: 2019-09-10 Last updated: 2019-09-23Bibliographically approved

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