<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Thorncroft, C.D.a c</style></author><author><style face="normal" font="default" size="100%">Flocas, H.A.b</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A case study of Saharan cyclogenesis</style></title><secondary-title><style face="normal" font="default" size="100%">Monthly Weather Review</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1997</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.scopus.com/inward/record.url?eid=2-s2.0-0001087764&amp;partnerID=40&amp;md5=d6300892beb9fae0eaa51fa34a71d755</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">6</style></number><volume><style face="normal" font="default" size="100%">125</style></volume><pages><style face="normal" font="default" size="100%">1147-1165</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">A case of Saharan cyclogenesis associated with the equatorward intrusion of a trough at the end of the Atlantic storm track is investigated. It is shown that a potential vorticity anomaly resulting from a baroclinic wave life cycle associated with the polar jet interacts with the low-level baroclinicity over subtropical Africa beneath the subtropical jet. It is suggested that low-latitude synoptic-scale cyclogenesis events of this type can be triggered only by upper-level potential vorticity anomalies if they have a sufficient depth scale and that the interaction may be aided by the presence of low static stability associated with a well-mixed boundary layer. A weak cold front also forms during the cyclogenesis event associated with the convergence of the baroclinicity of the polar trough front with the baroclinicity of the subtropical heat low.</style></abstract><notes><style face="normal" font="default" size="100%">cited By (since 1996)35</style></notes></record></records></xml>