Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Atmospheric and oceanic circulation from a thermodynamic perspective
Stockholm University, Faculty of Science, Department of Meteorology .
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 [en]
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: urn:nbn:se:su:diva-172842ISBN: 978-91-7797-827-5 (print)ISBN: 978-91-7797-828-2 (electronic)OAI: oai:DiVA.org:su-172842DiVA, id: diva2:1350174
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
List of papers
1. The Coupled Ocean-Atmosphere Hydrothermohaline Circulation
Open this publication in new window or tab >>The Coupled Ocean-Atmosphere Hydrothermohaline Circulation
Show others...
2017 (English)In: Journal of Climate, ISSN 0894-8755, E-ISSN 1520-0442, Vol. 30, no 2, p. 631-647Article in journal (Refereed) Published
Abstract [en]

The thermohaline circulation of the ocean is compared to the hydrothermal circulation of the atmosphere. The oceanic thermohaline circulation is expressed in potential temperature-absolute salinity space and comprises a tropical cell, a conveyor belt cell, and a polar cell, whereas the atmospheric hydrothermal circulation is expressed in potential temperature-specific humidity space and unifies the tropical Hadley and Walker cells as well as the midlatitude eddies into a single, global circulation. The oceanic thermohaline streamfunction makes it possible to analyze and quantify the entire World Ocean conversion rate between cold-warm and fresh-saline waters in one single representation. Its atmospheric analog, the hydrothermal streamfunction, instead captures the conversion rate between cold-warm and dry-humid air in one single representation. It is shown that the ocean thermohaline and the atmospheric hydrothermal cells are connected by the exchange of heat and freshwater through the sea surface. The two circulations are compared on the same diagramby scaling the axes such that the latent heat energy required to move an air parcel on the moisture axis is equivalent to that needed to move a water parcel on the salinity axis. Such a comparison leads the authors to propose that the Clausius-Clapeyron relationship guides both the moist branch of the atmospheric hydrothermal circulation and the warming branches of the tropical and conveyor belt cells of the oceanic thermohaline circulation.

National Category
Earth and Related Environmental Sciences
Research subject
Atmospheric Sciences and Oceanography
Identifiers
urn:nbn:se:su:diva-140409 (URN)10.1175/JCLI-D-15-0759.1 (DOI)000391856300013 ()
Available from: 2017-03-10 Created: 2017-03-10 Last updated: 2019-09-11Bibliographically approved
2. The effects of global warming on the coupled Ocean-Atmosphere Hydrothermohaline circulation
Open this publication in new window or tab >>The effects of global warming on the coupled Ocean-Atmosphere Hydrothermohaline circulation
(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:nbn:se:su:diva-172839 (URN)
Available from: 2019-09-10 Created: 2019-09-10 Last updated: 2019-09-11Bibliographically approved
3. Meridional Ocean Carbon Transport
Open this publication in new window or tab >>Meridional Ocean Carbon Transport
Show others...
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The ocean's ability to take up and store CO$_{2}$ is a key factor for understanding past and future climate variability. However, qualitative and quantitative understanding of surface-to-interior pathways, and how the ocean circulation affects the CO$_2$ uptake, is limited. Consequently, how changes in ocean circulation may influence carbon uptake and storage and therefore the future climate remains ambiguous.Here we quantify the roles played by ocean circulation and various water masses in the meridional redistribution of carbon.We do so by calculating stream functions defined in Dissolved Inorganic Carbon (DIC) and latitude coordinates, using output from a coupled biogeochemical-physical model. By further separating DIC into components originating from the solubility pump and a residual including the biological pump, air-sea disequilibrium and anthropogenic CO$_2$, we are able to distinguish the dominant pathways of how carbon enters particular water masses.With this new tool, we show that the largest meridional carbon transport occurs in a pole-to-equator transport in the subtropical gyres in the upper ocean. We are able to show that this pole-to-equator DIC transport, and the Atlantic Meridional Overturning Circulation (AMOC) related DIC transport, are mainly driven by the solubility pump. By contrast, the DIC transport associated with deep circulation, including that in Antarctic Bottom Water and Pacific Deep Water, is mostly driven by the biological pump. As these two pumps, as well as ocean circulation, are widely expected to be impacted by anthropogenic changes, these findings have implications for the future role of the ocean as a climate-buffering carbon reservoir.

National Category
Earth and Related Environmental Sciences
Research subject
Atmospheric Sciences and Oceanography
Identifiers
urn:nbn:se:su:diva-172840 (URN)
Available from: 2019-09-10 Created: 2019-09-10 Last updated: 2019-09-11Bibliographically approved
4. Multidecadal variability of the Mediterranean Overflow Water in the North Atlantic
Open this publication in new window or tab >>Multidecadal variability of the Mediterranean Overflow Water in the North Atlantic
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The Mediterranean overflow water is one of the most important intermediate--depth water masses in the North Atlantic. This water mass, formed in the Mediterranean Sea, produces a saline and warm water tongue at a depth of 1000 m that spreads out from the Strait of Gibraltar and fills a large area of the North Atlantic basin. The production of  this dense water is a result of the excess of evaporation over precipitation and river runoff. A pre-industrial simulation with the earth system model EC-Earth is used to investigate the overflow water. The multidecadal variability of the outflow is analysed by examining the modelled volume and salt transports through the Strait of Gibraltar as well as different atmospheric patterns (such as the wind pattern and the net freshwater fluxes). The salinity evolution in the main core of the outflow in the mid Atlantic is also taken into account.  \ald{The leading empirical orthogonal functions for the modeled salinity 1000 m coincided with the modeled distribution of outflow water}. The associated principal component showed a multidecadal variability of the salinity field. The variability of the net salt transport through the Strait of Gibraltar showed a similar behaviour where the Atlantic--Mediterranean system manifested two clear states. One of these is when the Mediterranean imports salt from the Atlantic and the other is where salt export to the Atlantic predominates. \ald{This result indicates that the Mediterranean Sea acts as a storage of salt alternating between the two states.

Keywords
Salt transport, Strait of Gibraltar, Earth system model, AMOC, NAO
National Category
Earth and Related Environmental Sciences
Research subject
Atmospheric Sciences and Oceanography
Identifiers
urn:nbn:se:su:diva-172841 (URN)
Available from: 2019-09-10 Created: 2019-09-10 Last updated: 2019-09-11Bibliographically approved

Open Access in DiVA

Atmospheric and oceanic circulation from a thermodynamic perspective(11134 kB)12 downloads
File information
File name FULLTEXT01.pdfFile size 11134 kBChecksum SHA-512
0136c7fd3b174f880768c77e18743913f84e24941e9707b86a4d8814b9d96e74278f10e0cc73aa3a7932092469696974ce0409a889836911ef930e2a5ad41862
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Aldama Campino, Aitor
By organisation
Department of Meteorology
Climate ResearchMeteorology and Atmospheric SciencesOceanography, Hydrology and Water Resources

Search outside of DiVA

GoogleGoogle Scholar
Total: 12 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 66 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf