AN ISENTROPIC TRAJECTORY STUDY OF A STRONG NORTHEAST MONSOON SURGE,
Abstract
The evolution of a strong monsoonal surge over China and Southeast Asia which produced an abrupt clearing over N. Vietnam was studied. Isentropic trajectories and the mean vertical motion for successive 12-hour periods were derived from the Montgomery Stream Function and pressure analyses on 290, 300 and 310K isentropic surfaces for each of the 12-hour periods from 12Z, 12 January to 12Z, 15 January 1967. Vertical cross-sections for the same period reveal the complexities in the thermal, moisture and wind fields. Isentropic charts, trajectories and vertical motions indicate that an intense anticyclone formed and intensified when a baroclinically unstable pattern developed north of the Himalayas. The results also indicate that the cold advection, the diffluent flow pattern, the descending motion and the cloudiness were well correlated. The sequence of events which begin at high latitudes and whose effects propagated to the tropical latitudes form a logical sequence which may prove valuable for future analyses and predictions. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1969
- Accession Number
- AD0687125
Entities
People
- Edwin F. Danielsen
- Francis P. Ho