The Effects of Latent Heating on Cold Frontal Speeds and Accelerations from a Potential Vorticity Perspective

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dc.contributor.advisor Yuh-Lang Lin, Committee Member en_US
dc.contributor.advisor Roscoe R. Braham, Committee Member en_US
dc.contributor.advisor Gary M. Lackmann, Committee Chair en_US Reeves, Heather Dawn en_US 2010-04-02T18:02:45Z 2010-04-02T18:02:45Z 2003-02-12 en_US
dc.identifier.other etd-02032003-103807 en_US
dc.description.abstract The effects of latent heating on frontal speed are investigated. It is conjectured that the existence of prefrontal latent heating leads to faster translation speeds and that the development of latent heating in the prefrontal zone can lead to frontal acceleration. A case study of a cold front where the attending precipitation band propagated into the prefrontal zone is presented. This front accelerated at the same time the precipitation moved into the prefrontal zone. Through inspection of the potential vorticity tendencies due only to latent heating, there is evidence that latent heating did alter the wind flow in the prefrontal zone, which may have contributed to positive frontogenetic tendencies in the prefrontal zone. A sensitivity test was conducted comparing a control simulation of the case study to a simulation ignoring the effects of latent heating and evaporative cooling (a 'fake dry simulation') for the same event. The front in the fake dry simulation moved slower than the front in the control simulation. This is in agreement with the hypothesis that latent heating leads to faster frontal translation speeds. However, the individual contributions of latent heating and evaporative cooling could not be determined from this experiment. An additional simulation which included the effects of latent heating, but not evaporative cooling was performed. Although the intensity of the front was considerably reduced in this simulation, the speed of the front was nearly identical to that in the control simulation: suggesting that latent heating effects are more important in dictating frontal speed than evaporative cooling effects. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject frontogenesis en_US
dc.subject acceleration en_US
dc.subject potential vorticity en_US
dc.subject cold front en_US
dc.title The Effects of Latent Heating on Cold Frontal Speeds and Accelerations from a Potential Vorticity Perspective en_US MS en_US thesis en_US Marine, Earth and Atmospheric Sciences en_US

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