Accession Number : ADA254436


Title :   The Role of Latent Heat Release in Explosive Cyclogenesis


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH


Personal Author(s) : Rinderknecht, Donald M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a254436.pdf


Report Date : Jan 1992


Pagination or Media Count : 86


Abstract : Extratropical cyclones and their attendant fronts are the primary cause of day to day weather changes at any given location in middle and higher latitudes. Storms that deepen at least 24 mb in a period of 24 hours or less are rapid developing storms. This research attempts to analyze the role of latent heating in explosive cyclogenesis, using the Sutcliffe Development Equation (SDE). The SDE describes cyclone development in terms of absolute vorticity advection, thickness advection, stability, and latent heating. The basic premise to be tested is that latent heating, including stable and convective components, plays a significant role in the rapid development of extratropical cyclones. The Sutcliffe Equation Analysis Model (SEAM), developed to study these storms, uses a grid of 27 points (x axis) by 18 points (y axis) with a spacing of 190.5 km. Verti- cal resolution in the SEAM consists of 19 levels from 1000 mb to 100 mb in 50 mb increments. The model atmosphere extends to 100 mb to accommodate moisture convergence and subordinate parameters needed to calculate latent heating, which is parameterized into two basic types; stable and convective latent heat release. Stable latent heat release (SLHR) is a large scale effect while convective latent heat release (CLHR) is a sub-grid scale effect. Analysis of results show that CLHR values were virtually non-existent in the normal case and very small in the bomb case. Comparison of Sutcliffe values and storm tracks show that areas of positive values downstream of the surface center indi- cate movement of either type of storm. The explosive storm followed along the Sutcliffe value ridge, while the normal storm moved perpendicular to the ridge.


Descriptors :   *LATENT HEAT , *CYCLONES , *CYCLOGENESIS , THICKNESS , STABILITY , MODELS , HEATING , CONVERGENCE , HEAT , ATMOSPHERES , BOMB CASES , RIDGES , LATITUDE , ADVECTION , MOISTURE , EQUATIONS , STORMS , SCALE , THESES , EXPLOSIVES


Subject Categories : Meteorology


Distribution Statement : APPROVED FOR PUBLIC RELEASE