بررسی همدید کنش‎های چرخندی در طی 1382-1340 خورشیدی

نوع مقاله: مقاله پژوهشی

نویسنده

استاد اقلیم شناسی، دانشگاه اصفهان

چکیده

چرخندهای عرض میانه از در فراهم آوردن بارش ایران نقش با ارزشی دارند. بررسی 43 سال داده‎های ارتفاع ژتوپتانسیل تراز 1000 هکتوپاسکال نشان داد که در طی سال‎های اخیر تعداد چرخندها به سبب گرمایش جهانی افزایش یافته است. در این پژوهش یک مرکز چرخندی با دو ویژگی آشکارسازی شد: ارتفاع ژئوپتانسیل در نقطه‎ی بررسی نسبت به هشت همسایه‎ی آن کمینه باشد و میانگین وزنی شیو ارتفاع ژئوپتاسیل بر روی نقطه‎ی بررسی و هشت همسایه‎ی آن دست کم 100 ژئوپتانسیل متر بر هزار کیلومتر باشد. در این پژوهش یک مرکز چرخندی بر روی عراق شناسایی شد که به سبب تأثیر بر اقلیم ایران شایان توجه است.

کلیدواژه‌ها


عنوان مقاله [English]

A Synoptic Analysis of Cyclonic Activity During 1961-2003

نویسنده [English]

  • Seyyed Abolfazl Masoodian
Esfahan Univ
چکیده [English]

Mid-latitude cyclones play an important role in precipitation over Iran. A survey on 6-hourly geopotential height of 1000 hPa level showed that the number of cyclones in the studied area reveals a positive trend. In this study a cyclone is considered as a low center with a regional geopotential gradient equal or greater than 100 gpm per 1000 km. Applying the procedure on NCEP/NCAR data a cyclonic center of action appeared to be exist over Iraq. Appearnce of such center of action seems to have remarkable concequences for climate of Iran.

کلیدواژه‌ها [English]

  • Extratropical cyclon
  • Cyclonic center
  • Geopotential Height
  • Iran

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