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Redistribution of meridional atmospheric energy transport caused by polar amplification on an aqua planet

Show simple item record 2021-04-14T12:24:28Z 2021-04-14T12:24:28Z 2021-04-14
dc.title Redistribution of meridional atmospheric energy transport caused by polar amplification on an aqua planet en
ethesis.faculty Matemaattis-luonnontieteellinen tiedekunta fi
ethesis.faculty Faculty of Science en
ethesis.faculty Matematisk-naturvetenskapliga fakulteten sv
ethesis.faculty.URI Helsingin yliopisto fi University of Helsinki en Helsingfors universitet sv
dct.creator Mahó, Sándor István
dct.issued 2021
dct.language.ISO639-2 eng
dct.abstract This thesis analyses the alterations of vertically integrated atmospheric meridional energy transport due to polar amplification on an aqua planet. We analyse the energy transport of sensible heat, latent energy, potential energy and kinetic energy. We also cover the energy flux of the mean meridional circulation, transient eddies and stationary eddies. In addition, we also address the response of the zonal mean air temperature, zonal mean zonal wind, zonal mean meridional wind, zonal mean stream function and zonal mean specific humidity. Numerical model experiments were carried out with OpenIFS in its aqua planet configuration. A control (CTRL) and a polar amplification (PA) simulation was set up forced by different SST (sea surface temperature) patterns. We detected tropospheric warming and atmospheric specific humidity increase 15-90° N/S and reduction of the meridional temperature gradient throughout the troposphere. We also found reduced strength of the subtropical jet stream and slowdown of the mean meridional circulation. Important changes were identified in the Hadley cell: the rising branch shifted poleward and caused reduced lifting in equatorial areas. Regarding the total atmospheric vertically integrated meridional energy transport, we found reduction in case of the mean meridional circulation and transient eddies in all latitudes. The largest reduction was shown by the Hadley cell transport (-15%) and by midlatitude transient eddy flux (-23%). Unlike most studies, we did not observe that meridional latent energy transport increases by polar amplification. Therefore, it is stated that the increased moisture content of the atmosphere does not imply increased meridional latent energy transport, and hence there is no compensation for the decrease of meridional dry static energy transport. Lastly, we did not detect stationary eddies in our simulations which is caused by the simplified surface boundary (i.e. the water-covered Earth surface). The main finding of this thesis is that polar amplification causes decreasing poleward energy transport on an aqua planet. en
dct.subject polar amplification en
dct.subject meridional energy transport en
dct.subject aqua planet simulations en
dct.subject OpenIFS en
dct.language en
ethesis.isPublicationLicenseAccepted true
ethesis.language englanti fi
ethesis.language English en
ethesis.language engelska sv
ethesis.thesistype pro gradu -tutkielmat fi
ethesis.thesistype master's thesis en
ethesis.thesistype pro gradu-avhandlingar sv
dct.identifier.ethesis E-thesisID:bad05d39-cbad-4c07-8e19-dac9e3576214
dct.identifier.urn URN:NBN:fi:hulib-202104141889
dc.type.dcmitype Text
ethesis.facultystudyline Meteorologia fi
ethesis.facultystudyline Meteorology en
ethesis.facultystudyline Meteorologi sv
ethesis.mastersdegreeprogram Ilmakehätieteiden maisteriohjelma fi
ethesis.mastersdegreeprogram Master's Programme in Atmospheric Sciences en
ethesis.mastersdegreeprogram Magisterprogrammet i atmosfärsvetenskaper sv

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