نوع مقاله : پژوهشی

نویسندگان

1 صیاد اصغری سراسکانرود، استاد گروه جغرافیای طبیعی، دانشکده‌ی علوم اجتماعی، دانشگاه محقق اردبیلی، اردبیل، ایران

2 دانشجوی دکترای ژئومورفولوژی، دانشکده علوم اجتماعی، دانشگاه محقق اردبیلی، اردبیل

3 کارشناسی ارشد، دانشکده علوم اجتماعی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

سطوح دارای پوشش برف (SC) بر تعادل انرژی سطح زمین از طریق بازخورد آلبیدو تأثیر می‌گذارد، و همچنین تاثیر عمده‌ای بر فرآیندهای اقلیمی، فعالیت‌های انسانی و چرخه هیدرولوژی، دارد. دمای سطح زمین (LST) از عناصر اصلی در شناخت اقلیم یک منطقه است که تغییرات و نوسانات آن‌ها در طبقات ارتفاعی مختلف برای بررسی‌های هیدرولوژیکی بسیار کاربردی است. هدف از این مطالعه ارزیابی و بررسی ارتباط دمای سطح زمین و سطح پوشش برف با مولفه توپوگرافیکی ارتفاع در حوضه دریاچه ارومیه می‌باشد. در این پژوهش به علت سهولت دسترسی به داده‌های سنجش‌ازدور و تفکیک مناسب زمانی و مکانی تصاویر ماهواره‌ای ترا، از تصاویر سنجنده مودیس به صورت ماهانه، فصلی و سالانه در بازه زمانی 1379-1399 استفاده شده است. نتایج به دست آمده نشان می‌دهد بین LST و SC رابطه معکوس وجود دارد، همچنین بررسی نقشه‌های SC و طبقات ارتفاعی نشان می‌دهد رابطه مستقیمی بین این دو متغیر وجود دارد، در واقع با افزایش ارتفاع پایداری برف در منطقه افزایش می‌یابد به‌طوری‌که در ارتفاعات بیشتر از 3000 متر مقدار سطح پوشش برف بیش از 98% نسبت به منطقه است. تغییرات دمای سطح زمین در ارتفاعات مختلف معکوس تغییرات سطح پوشش برف است بنابراین در ارتفاعات کمتر از 2000 متر میانگین سالانه دما 21تا 35 درجه سانتی‌گراد است، اما در ارتفاعات بالاتر از 3500 متر میانگین دمای سالانه حدود 7 الی 13 درجه می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of changes in snow cover and surface temperature with topographic component of elevation Case study (Urmia Lake catchment)

نویسندگان [English]

  • sayyad Asghari Saraskanrood 1
  • abozar sadeghi 2
  • elham molanouro 3

1 Professor, Department of Physical Geography, Faculty of Social Sciences, University of Mohaghegh Ardabili, Ardabil, Iran.

2 PhD Student in Geomorphology, Faculty of Social Sciences, Mohaghegh Ardabili University, Ardabil, Iran

3 Department of Natural Geography, Faculty of Social Sciences, Mohaghegh Ardabili University, Ardabil, Iran

چکیده [English]

Snow-covered (SC) surfaces influence the land surface energy balance through albedo feedback, and also have a major impact on climate processes, human activities, and the hydrological cycle. Land surface temperature is one of the main elements in knowing the climate of a region, whose changes and fluctuations in different altitude classes are very useful for hydrological studies. The purpose of this study is to evaluate and investigate the relationship between ground surface temperature and snow cover level with the topographical component of height in Urmia lake basin. In this research, due to the ease of access to remote sensing data and the appropriate temporal and spatial separation of Terra satellite images, monthly, seasonal and annual MODIS sensor images have been used in the period of 1379-1399. The obtained results show that there is an inverse relationship between LST and SC, also the examination of SC maps and elevation classes shows that there is a direct relationship between these two variables, in fact, with the increase in altitude, the stability of snow in the region increases so that at altitudes higher than 3000 m, the amount of snow cover is more than 98% compared to the region. The changes in the temperature of the earth's surface at different altitudes are the reverse of the changes in the snow cover, so at altitudes less than 2000 meters, the annual average temperature is 21-35 Celsius, but at altitudes higher than 3500 meters, the average temperature is about 7-13 Degree.

کلیدواژه‌ها [English]

  • Modis sensor
  • snow cover level
  • ground surface temperature
  • topographic component of height
  • Urmia Lake catchment area
 
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