DETERMINATION OF THE RAIN PRODUCING WEATHER TYPES IN TEHRAN USING VORTICITY COMPUTATION METHOD

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ALIJANI B.

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Journal Paper

Paper Information

Journal: GEOGRAPHICAL RESEARCH Year:2002 | Volume:16-17 | Issue:4-1 (63-64) Page(s): 115-132

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Title

DETERMINATION OF THE RAIN PRODUCING WEATHER TYPES IN TEHRAN USING VORTICITY COMPUTATION METHOD

Author(s)

ALIJANI B.

Keywords

WEATHER TYPES

TEHRAN

OBJECTIVE WEATHER TYPING METHOD

RELATION BETWEEN WEATHER TYPES AND PRECIPITATION

VORTICITY COMPUTATION

Abstract

In order to determine the types of rain producing weather in TEHRAN, the rainy days of the station (days with more than or equal to 1 millimeter) were identified during the 1990-95 period. The 12 GMT pressure and height data of the area 200-47.5° and 35°-67.5°E were -extracted from the NCEP Reanalysis file for the grid points 2.50 apart. The synoptic systems and flow directions were determined according to the objective method of computing vorticity. The results first showed 24 pressure patterns for the three groups of light, moderate, and heavy precipitation days. Then these patterns were re-grouped according to their similarities into 10 WEATHER TYPES. These types consist of two cyclonic and anticyclonic, and 8 directional types corresponding to 8 geographical directions. The most frequent type was the Easterly and the most important rain producing type was the cyclonic type. The anticyclonic type was the least rain producing type. Cyclonictypes were more dominant and developed mostly in winter. The anticycloictypes showed lower frequency and concentrated in spring.This study showed that the VORTICITY COMPUTATION method is very effective and accurate and capable of quantifying the power of the WEATHER TYPES. The 500 hpa level had more significant effect on the precipitation than the surface pressure changes. The Syrian trough was the most important upper level system which controls the precipitation of TEHRAN.

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APA: Copy

ALIJANI, B.. (2002). DETERMINATION OF THE RAIN PRODUCING WEATHER TYPES IN TEHRAN USING VORTICITY COMPUTATION METHOD. GEOGRAPHICAL RESEARCH, 16-17(4-1 (63-64)), 115-132. SID. https://sid.ir/paper/529698/en

Vancouver: Copy

ALIJANI B.. DETERMINATION OF THE RAIN PRODUCING WEATHER TYPES IN TEHRAN USING VORTICITY COMPUTATION METHOD. GEOGRAPHICAL RESEARCH[Internet]. 2002;16-17(4-1 (63-64)):115-132. Available from: https://sid.ir/paper/529698/en

IEEE: Copy

B. ALIJANI, “DETERMINATION OF THE RAIN PRODUCING WEATHER TYPES IN TEHRAN USING VORTICITY COMPUTATION METHOD,” GEOGRAPHICAL RESEARCH, vol. 16-17, no. 4-1 (63-64), pp. 115–132, 2002, [Online]. Available: https://sid.ir/paper/529698/en

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