An Analysis of a Relatively Rare Case of Continental Blocking

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An Analysis of a Relatively Rare Case of Continental Blocking

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/2396

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dc.contributor.author Bosart, Lance F. en
dc.contributor.author Lupo, Anthony R., 1966- en
dc.date.accessioned 2009-09-02T14:42:11Z en
dc.date.available 2009-09-02T14:42:11Z en
dc.date.issued 1999-01 en
dc.identifier.citation Quarterly Journal of the Royal Meteorological Society, Volume 125 Issue 553 pp. 107-138. en
dc.identifier.issn 0035-9009 en
dc.identifier.uri http://hdl.handle.net/10355/2396 en
dc.description.abstract A planetary and synoptic-scale analysis of a relatively rare continental blocking event that occurred over North America during the spring of 1980 are undertaken to determine whether or not this event was different from its counterparts which occur over oceanic regions. The planetary-scale analysis demonstrates that, during the spring season, a ridge was located further inland over the North American continent and amplified with respect to climatology. The position of this ridge may have been linked to a broad region of colder-than-normal SSTs found over the north central Pacific during the spring season and much of the previous winter. Simple "Sutcliffe-type" and thermodynamic analyses of the accompanying lower tropospheric warm anomaly associated with the ridging shows that lower tropospheric temperature advection and subsidence associated with anticyclonic vorticity advection by the time mean thermal wind produced much of the anomalous warmth. A simple synoptic-scale analysis was performed using both the Zwack-Okossi (ZO) equation and potential vorticity (PV) thinking approaches. These complementary analyses demonstrated that synoptic-scale cyclones were instrumental in the formation and maintenance (and/or intensification) of this blocking event. The PV analysis demonstrated that low-PV air was swept poleward and then was advected over the blocking region sustaining the broad region of low potential vorticity associated with the block over North America. The ZO analysis showed that the advection of anticyclonic vorticity was the most important mechanism forcing geopotential height rises at 500 hPa over the block center. The region of low PV and ZO height rises could be associated with the anticyclonic shear side of an upstream jet maximum typically found in association with developing and/or intensifying blocking event. Thus, negative PV advection correlated significantly with calculated ZO height rises. Finally, it is suggested that a favorable phase-relationship between the upstream cyclones and the large-scale ridge is necessary for block development or intensification. en
dc.language.iso en_US en
dc.publisher Jon Wiley and Sons en
dc.source.uri http://solberg.snr.missouri.edu/gcc/ en
dc.subject continental blocking event en
dc.subject global climatology en
dc.subject.lcsh Climatology en
dc.subject.lcsh Tropopause en
dc.subject.lcsh Cyclones en
dc.subject.lcsh Blocking (Meteorology) en
dc.title An Analysis of a Relatively Rare Case of Continental Blocking en
dc.type Article en
dc.contributor.corporatename University of Missouri-Columbia. College of Agriculture, Food and Natural Resources (CAFNR). School of Natural Resources. Department of Soil, Environmental and Atmospheric Sciences. en
dc.relation.ispartofcommunity University of Missouri-Columbia. College of Agriculture, Food and Natural Resources. School of Natural Resources. Department of Soil, Environmental and Atmospheric Sciences
dc.relation.ispartofcollection Soil, Environmental and Atmospheric Sciences publications (MU)


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