جغرافیا و روابط انسانی

جغرافیا و روابط انسانی

واکاوی همدید بی‌هنجاری‌های رطوبت ویژه پاییز‌های مرطوب در شمال‌غرب ایران

نوع مقاله : مقاله پژوهشی

نویسندگان
1 معاون/اداره حفاظت محیط زیست مشگین شهر
2 گروه جغرافیا، واحد اهر، دانشگاه آزاد اسلامی، اهر، ایران
3 گروه جغرافیا، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران
4 کارشناس ارشد مرتع و آبخیزداری اداره حفاظت محیط زیست مشکین شهر
چکیده
بارش یکی از عناصر اقلیمی است که با افزایش یا کاهش بر کلیه عوامل جوی-اقلیمی و زیست محیطی اثر دارد. به منظور تحلیل و بررسی آماری-همدیدی وقوع پاییز‌های مرطوب در شمال‌غرب ایران ، آمار بارش ماهانه فصل پاییز 15 ایستگاه سینوپتیک طی دوره آماری 2016- 1987 از سازمان هواشناسی دریافت گردید. جهت شناسایی و تفکیک فصول پاییز مرطوب، از شاخص بارش استاندارد استفاده گردید، سپس داده‌های فصلی تراز 500 و 700 هکتوپاسکال به مختصات10 تا 75 درجه طول شرقی و20 تا 70 درجه عرض شمالی در دوره‌های مرطوب از مجموع داده‌های بازسازی شده سایت NCEP/NCARدریافت و مورد بررسی قرار گرفت. نتایج حاصل نشان داد فراوانی وقوع وضعیت نرمال و ترسالی در شدت‌های ملایم و متوسط، در منطقه بیشتر رخ می‌دهد. همچنین ناهنجاری‌های منفی ناشی از کاهش ارتفاع در تراز 500 هکتوپاسکال بر روی منطقه و ناهنجاری‌های شدید مثبت بر روی مرکز تا شمال اروپا مهم‌ترین عامل وقوع پاییز مرطوب در منطقه می‌باشد. همچنیین در تراز 700 هکتوپاسکال بی‌هنجاری‌های مثبت حاکی از فعالیت کم‌فشار سودانی و مدیترانه‌ای در سطح زمین نسبت به بلندمدت در منابع تامین رطوبت ملاحظه می گردد. با توجه به هدف پژوهش که تغییر منبع رطوبت ذکر شده مشخص گردید دریای مدیترانه و دریای سرخ نقش تعیین کننده ای در ترسالی منطقه دارند.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Synoptic analysis of humidity anomalies especially in wet autumns in northwestern Iran

نویسندگان English

mohammad mirzaie 1
Karim Aminina 2
Ali Panahi 3
Abolfazl Hammetzadeh 4
1 Deputy / Environmental Protection Department of Meshginshahr, Iran
2 Department of Geography, Ahar Branch, Islamic Azad University, Ahar, Iran
3 Department of Geography, Tabriz Branch, Islamic Azad University, Tabriz, Iran
4 Senior expert on rangeland and watershed management of Meshkin Shahr Environmental Protection Department
چکیده English

Precipitation is one of the elements of climate, any increase or decrease of which affects all atmospheric-climatic and environmental factors. In order to analyze and analyze the occurrence of wet autumns in northwest Iran, the monthly rainfall statistics of 15 synoptic stations during the statistical period of 1987-2016 were received from the Meteorological Organization. In order to identify and separate the wet autumn seasons, the standard precipitation index was used, then the seasonal data of 500 and 700 hectopascals at the coordinates of 10 to 75 degrees east longitude and 20 to 70 degrees north latitude in wet periods were obtained from the total reconstructed data of the NCEP/NCAR website And Was investigated. The results showed that the frequency of occurrence of normal and fearful conditions in mild and moderate intensities occurs more in the region. The negative anomalies caused by the decrease in height at the level of 500 hectopascals over the region and the strong positive anomalies over central to northern Europe are the most important causes of wet autumn in the region. Also, at the level of 700 hectopascals, there are positive anomalies indicating the activity of Sudanese and Mediterranean low pressure on the earth's surface compared to the long-term sources of moisture supply. Also, Sudanese low pressure systems and combined Sudanese-Mediterranean low pressure systems play a prominent role in moisture transfer. to the study area.

کلیدواژه‌ها English

Synoptic analysis
Specific humidity anomalies
Hof-Mueller diagram
wet autumns
northwest
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  • تاریخ دریافت 28 اسفند 1402
  • تاریخ بازنگری 28 دی 1403
  • تاریخ پذیرش 21 اردیبهشت 1403