?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Matthewman&rft.aufirst=N.J.&rft.au=Matthewman%2C+N.J.&rft.inst=UCL+(University+College+London)&rft.degree=Doctoral&rft.date=October+2009&rft.tpages=326&rft.title=A+vortex+dynamics+perspective+on+stratospheric+sudden+warmings