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The ONR Tropical Cyclone Motion initiative is a five-year program to improve basic understanding of tropical cyclone motion. On 27-30 January 1988, a meeting was held in Monterey, Calif to: 1) Review the first year's research activities; 2) Discuss issues and plan future research; and 3) Begin discussion of tentative hypotheses that might be explored in a field experiment in the western North Pacific region during summer 1990. Each of these topics is briefly discussed to indicate the progress and plans of the initiative. Keywords: Tropical meteorology; Typhoon motion.
The Office of Naval Research Tropical Cyclone Motion initiative is a five-year program to improve basic understanding of tropical cyclone motion. On 29 June - 1 July 1988, a meeting was held near Brisbane, Australia to: (i) Review recent research activities; (ii) Discuss issues and plan future research; (iii) Discuss the hypotheses that might be explored in a field experiment in the western North Pacific region during summer 1990; and (iv) Form working groups to begin planning for the field experiments. Each of these topics will be briefly discussed to indicate the progress and plans of the initiative. (fr).
The Office of Naval Research Tropical Cyclone Motion initiative is a five-year program to improve basic understanding of tropical cyclone motion. On 29 June - 1 July 1988, a meeting was held near Brisbane, Australia to: (i) Review recent research activities; (ii) Discuss issues and plan future research; (iii) Discuss the hypotheses that might be explored in a field experiment in the western North Pacific region during summer 1990; and (iv) Form working groups to begin planning for the field experiments. Each of these topics will be briefly discussed to indicate the progress and plans of the initiative. (fr).
The Tropical Cyclone Motion initiative is a five-year program to improve basic understanding of tropical cyclone motion. The tropical Cyclone Motion (TCM-90) field experiment was carried out during August and September 1990. The first section of this report describes the data management plan for TCM-90, and includes descriptions of the observational systems that provided data in real-time and on a delayed basis. The second section of this report summarizes the seven Intensive Observation Periods during TCM-90. A summary of the real-time data collection also is provided to aid the reader in selecting cases for study. A more complete listing that includes delayed data will be provided about April 1991, when the production of the final analyses will begin.
The Office of Naval Research Tropical Cyclone Motion initiative is a five-year program to improve understanding of tropical cyclone motion. On 31 August-1 September 1989, a workshop was held in Monterey, California to consider the characteristics of data assimilation systems for tropical analyses. The focus is on special considerations that might apply in preparing a set of final analyses of the observations to be obtained in the Tropical Cyclone Motion field experiment during August and September 1990. The basic characteristics of the analysis grid, handling of the special experimental observations, objective analysis considerations, data assimilation procedures, inclusion of bogus observations, initialization techniques, and other considerations are summarized. Keywords: Meteorological studies; Cyclones; Tropical cyclone motion; Data assimilation; Typhoon motion. (kt).
Expanded opportunities for theoretical studies of tropical cyclone motion are suggested in terms of more representative environmental structures and physical processes. Concurrent experimentation with state-of-the-art numerical models are recommended, especially for environmental conditions related to western North Pacific tropical cyclones. A review of existing observational data sets for testing hypotheses indicated that all satellite derived fields were already being studied. Thus a need exists for additional data sets, perhaps through deployment of recently developed dropwindsondes or of an array of wind profilers and the exploitation of satellite microwave imagers and sounders. Concerns regarding the feasibility of such a field experiment are related to lack of operational reconnaissance, availability of aircraft platforms for deploying the dropwindsondes and the need for international cooperation. The recommended mechanism to facilitate progress would be to establish a center for tropical cyclone motion studies.