A 15-year climatology of synoptical disturbance over tropical northwestern Pacific during summer
MetadataShow full item record
This work investigated the sumertime northwestward propagating waves over the tropical western North Pacific and their relationship with tropical cyclone activities. The 15-season (May-October 1974-1988) Navy tropical global band data were separated into three groups according to the degree of organization in the multiple-set canonical correlation (MCC) modes that were computed from the surface v wind. Groups A (6 seasons) and B (5 seasons) showed orderly large-scale propagating patterns at the surface and 700 hPa with an average period of 8 days and a wavelength of about 2500-3000 km. The structure is robust whether the MCC analysis was performed on each of the seasons individually or on groups of years. A strong in-phase relationship between the low-level disturbance cyclonic cells and tropical cyclone centers was found. Composite analysis of all cases in these two groups whose MCC mode 1 amplitude exceeded 1.5 m/s showed organized northwestward propagating divergence/convergence patterns at 200 hPa. Group C (4 seasons) shows the least organized structure, with a large difference between MCC modes obtained from the entire group and those from each individual season. The possibility that group C contains irregular tropical cyclone tracks was discussed.
Showing items related by title, author, creator and subject.
Stratton, Matthew B. (Monterey, California. Naval Postgraduate School, 2006-03);Within the Pacific Air Forces (PACAF) area of responsibility, tropical deep convection that is not associated with tropical cyclones can cause significant impacts to operations. In this study, convective indices calculated ...
Annual cycle of Southeast Asia - Maritime Continent rainfall and the asymmetric monsoon transition Chang, C.-P.; Wang, Z.; McBride, J.; Liu, C. H. (2005);In general the Bay of Bengal, Indochina Peninsula and Philippines are in the Asian summer monsoon regime while the Maritime Continent experiences a wet monsoon during boreal winter and a dry season during boreal summer. ...
Southern Hemisphere Application of the Systematic Approach to Tropical Cyclone Track Forecasting. Part IV : sources of large track errors by dynamical models Reader, Grahame; Boothe, Mark A.; Elsberry, Russell L.; Carr, Lester E. (Monterey, California. Naval Postgraduate School, 2000-08); NPS-MR-00-004Sources of 72-h track errors > 300 n mi by four dynamical model tropical cyclone predictions in the Southern Hemisphere during the 1997-98 and 1998-99 seasons are studied using conceptual models Carr and Elsberry have ...