A comparison of observed and numerically predicted eddy kinetic energy budgets for a developing extratropical cycloneThe eddy kinetic energy budget is calculated for a 48-hour forecast of an intense occluding winter cyclone associated with a strong well-developed jet stream. The model output consists of the initialized (1200 GMT January 9, 1975) and the 12, 24, 36, and 48 hour forecast fields from the Drexel/NCAR Limited Area Mesoscale Prediction System (LAMPS) model. The LAMPS forecast compares well with observations for the first 24 hours, but then overdevelops the low-level cyclone while inadequately developing the upper-air wave and jet. Eddy kinetic energy was found to be concentrated in the upper-troposphere with maxima flanking the primary trough. The increases in kinetic energy were found to be due to an excess of the primary source term of kinetic energy content, which is the horizontal flux of eddy kinetic energy over the primary sinks, and the generation and dissipation of eddy kinetic energy.
Document ID
19840043529
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dare, P. M. (Purdue Univ. West Lafayette, IN, United States)
Smith, P. J. (Purdue University West Lafayette, IN, United States)