Mass Field Retrieval Using Profiler Data with Application to Low-Level Jet Analysis
Abstract
A study into the method of reproducing the geopotential height and temperature fields using a higher resolution observational network is conducted. Wind profiler data is used with the addition of RAOB data to produce an accurate wind field on an hourly basis. From this higher resolution wind field, the divergence equation was employed to produce a new mass field. The method allows for a better analysis of atmospheric features. This technique allowed for a mesoscale study in two areas. The first component of the study involved three examples of a summer time low level jet (LLJ) in the Great Plains of the United States. With the newly derived mass and wind field, it was determined the jet was formed by an inertial oscillation and low level baroclinicity for two of the LLJs. A transverse ageostrophic circulation played a role for the third LLJ. The other component of this study concerned investigating the effects, if any, of the frictional stress term in the divergence equation and how it played on the retrieval of the new mass field. In past studies this term had been ignored. The lower atmosphere was analyzed and sensitivity studies were conducted to investigate the importance of the frictional stresses. It was determined for these two particular atmospheric case study days that the frictional force plays no significant role. These results were then compared to a mesoscale model to check the accuracy of the technique. The model output was generally in agreement with the retrieval technique analysis at the initial hour as well as at the forecasted hours.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 11, 1998
- Accession Number
- ADA353139
Entities
People
- Dan A. Shaltanis
Organizations
- North Carolina State University