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dc.contributor.authorMoseid, Kristine Onsum
dc.date.accessioned2018-09-07T22:04:41Z
dc.date.available2018-09-07T22:04:41Z
dc.date.issued2018
dc.identifier.citationMoseid, Kristine Onsum. The Scaling, Efficacy, and Timescales of Precipitation Change: A comparison between CO2 and CH4 perturbations using CESM CAM4. Master thesis, University of Oslo, 2018
dc.identifier.urihttp://hdl.handle.net/10852/64549
dc.description.abstractPrecipitation patterns and rates change with global warming. These changes can be separately evaluated in fast and slow responses, the combination of the two are called apparent responses. The fast precipitation responses can be understood by energetics, while the slow precipitation responses scale with surface temperature change. Precipitation Driver and Response Model Intercomparison Project (PDRMIP) is a project investigating precipitation responses to separate climate drivers. One of their experiments, a tripling of atmospheric CH4, proved too weak of a perturbation to compare to the other experiments in the project. This thesis performs two stronger perturbations of CH4 and compare precipitation responses to a doubling of CO2, using one of the models in PDRMIP, CESM1 CAM4. Two configurations were used to separate responses in timescales, and each perturbation were run as an ensemble to reduce natural variability. Both surface temperature and apparent precipitation responses scale well with forcing for CH4. CO2 does not scale equally to CH4. The apparent surface temperature efficacy for methane was below 1, averaging at 0.96 ± 0.07, while the apparent precipitation efficacy was above 1, averaging at 1.24 ± 0.09. Fast precipitation changes has a negative correlation to atmospheric absorption, and the CO2 simulation exhibited the strongest atmospheric absorption as well as the strongest negative fast precipitation response.eng
dc.language.isoeng
dc.subjectprecipitation
dc.subjectcarbon dioxide
dc.subjectscaling
dc.subjecteffective radiative forcing
dc.subjectco2
dc.subjectTimescales
dc.subjectERF
dc.subjectmethane
dc.subjectefficacy
dc.subjectch4
dc.titleThe Scaling, Efficacy, and Timescales of Precipitation Change: A comparison between CO2 and CH4 perturbations using CESM CAM4eng
dc.typeMaster thesis
dc.date.updated2018-09-07T22:04:41Z
dc.creator.authorMoseid, Kristine Onsum
dc.identifier.urnURN:NBN:no-66976
dc.type.documentMasteroppgave
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/64549/1/main.pdf


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