<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Abatzoglou, John</style></author><author><style face="normal" font="default" size="100%">Magnusdottir, G.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Wave breaking along the stratospheric polar vortex as seen in ERA-40 data</style></title><secondary-title><style face="normal" font="default" size="100%">Geophysical Research Letters</style></secondary-title><alt-title><style face="normal" font="default" size="100%">Geophys. Res. Lett.</style></alt-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">1000</style></keyword><keyword><style  face="normal" font="default" size="100%">Content Type: Biblio</style></keyword><keyword><style  face="normal" font="default" size="100%">Magnusdottir Modeling Lab</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2007</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Apr</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">&lt;Go to ISI&gt;://000246141800004</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">8</style></number><volume><style face="normal" font="default" size="100%">34</style></volume><isbn><style face="normal" font="default" size="100%">0094-8276</style></isbn><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Planetary wave breaking through the depth of the Northern Hemispheric stratosphere is observed in daily ERA-40 reanalysis data. Strong wave breaking along the vortex edge is objectively diagnosed by noting the large-scale overturning of potential vorticity contours on isentropic surfaces spanning the stratospheric vortex. Breaking events show distinctly different climatologies depending on whether they occur along the upper or lower portion of the stratospheric vortex. During early winter there is a strong negative correlation between the frequency of breaking events in these two regions. Frequent wave breaking in the lower stratosphere in early winter appears to both shield the upper portion of the vortex from wave disturbances and reduce the net upward wave activity flux into the troposphere, thereby allowing the vortex to strengthen into mid-winter.&lt;/p&gt;</style></abstract><work-type><style face="normal" font="default" size="100%">Article</style></work-type><accession-num><style face="normal" font="default" size="100%">ISI:000246141800004</style></accession-num><notes><style face="normal" font="default" size="100%">&lt;p&gt;ISI Document Delivery No.: 163EOTimes Cited: 4Cited Reference Count: 7Cited References:      ABATZOGLOU JT, 2006, J CLIMATE, V19, P6139     BALDWIN MP, 1988, J ATMOS SCI, V45, P1124     MCINTYRE ME, 1983, NATURE, V305, P593     NASH ER, 1996, J GEOPHYS RES-ATMOS, V101, P9471     POLVANI LM, 2000, J ATMOS SCI, V57, P3663     RANDEL W, 2004, J CLIMATE, V17, P986     SCOTT RK, 2004, GEOPHYS RES LETT, V31, ARTN L02115Abatzoglou, John T. Magnusdottir, GudrunAmer geophysical unionWashington&lt;/p&gt;</style></notes><auth-address><style face="normal" font="default" size="100%">&lt;p&gt;Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA 92697 USA.Abatzoglou, JT, Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA 92697 USA.gudrun@uci.edu&lt;/p&gt;</style></auth-address></record></records></xml>