500 HPA CIRCULATION PATTERNS ASSOCIATED WITH RAINY YEARS OF IRAN

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ATAEI H.

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Journal: GEOGRAPHICAL RESEARCH Year:2008 | Volume:23 | Issue:3 (90) Page(s): 19-38

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Title

500 HPA CIRCULATION PATTERNS ASSOCIATED WITH RAINY YEARS OF IRAN

Author(s)

ATAEI H. | Issue Writer Certificate

Keywords

CIRCULATION PATTERNQ2

RAINY YEARQ2

IRANQ3

PCAQ3

GEOPOTENTIAL HEIGHTQ2

Abstract

In order to explore the spatial and temporal variation of 500 hpa circulatiorpatterns and their relationship with the RAINY YEARs of IRAN (1974, 1976, 1982, 198 fund 1992), daily GEOPOTENTIAL HEIGHTs for the region 0oE to 70oE and looN to 60 oN ,at 2.5 degree resolution, were analysized. A PCA analysis of GEOPOTENTIAL HEIGHTs in S-mode showed that there are seven significant CIRCULATION PATTERNs. These patterns explain about 93 percent of variance. The 1st CIRCULATION PATTERN represents a deep trough over Iraq, and IRAN is located in its eastern part. CIRCULATION PATTERN 2 represents a trough over the Mediterranean Sea. CIRCULATION PATTERN 3 represents shallow trough over the IRAN. CIRCULATION PATTERN 4, which its representative day is December 21st 1982 indicates a trough over the Cyprus. A rather shallow trough dominates over IRAN. CIRCULATION PATTERN 5 represents shallow trough over the Black sea which probably affected north and northwest Of IRAN. The sixth CIRCULATION PATTERN is a representative trough over the Caspian Sea which extends toward the Black Sea and even the Mediterranean Sea. The seventh CIRCULATION PATTERN represents the disposition of a high over Iraq that extends all over IRAN. Some of These CIRCULATION PATTERNs lead air masses to IRAN which causes years with high precipitation.

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APA: Copy

ATAEI, H.. (2008). 500 HPA CIRCULATION PATTERNS ASSOCIATED WITH RAINY YEARS OF IRAN. GEOGRAPHICAL RESEARCH, 23(3 (90)), 19-38. SID. https://sid.ir/paper/29729/en

Vancouver: Copy

ATAEI H.. 500 HPA CIRCULATION PATTERNS ASSOCIATED WITH RAINY YEARS OF IRAN. GEOGRAPHICAL RESEARCH[Internet]. 2008;23(3 (90)):19-38. Available from: https://sid.ir/paper/29729/en

IEEE: Copy

H. ATAEI, “500 HPA CIRCULATION PATTERNS ASSOCIATED WITH RAINY YEARS OF IRAN,” GEOGRAPHICAL RESEARCH, vol. 23, no. 3 (90), pp. 19–38, 2008, [Online]. Available: https://sid.ir/paper/29729/en

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