برآورد تابش خورشیدی با استفاده از داده‌های تابش ماهواره‌ای SARAH در شمال‌غرب ایران

نویسندگان

1 دانش آموخته دکتری منابع آب، گروه مهندسی آب، دانشکده کشاورزی، دانشگاه بوعلی همدان

2 استاد گروه مهندسی منابع آب، دانشکده کشاورزی، دانشگاه بوعلی همدان

چکیده

تعیین دقیق میزان تابش خورشیدی در سطح زمین برای مطالعات اقلیمی و کاربردهای انرژی خورشیدی، امر مهمی است. مجموعه داده‌های ماهواره‌ای تابش خورشیدی، پوشش وسیعی از داده‌های مکانی و زمانی را ارائه می‌دهد، اما اعتبارسنجی دقیق این داده‌ها، برای استفاده قابل اعتماد از آنها لازم است. در این مطالعه از داده‌های روزانه ماهواره‌ای تابش SARAH برای تخمین تابش خورشیدی روزانه در پنج ایستگاه‌ هواشناسی منطقه شمال‌غرب ایران در سال‌های 2009 و 2010 استفاده گردید. با توجه به نتایج به دست‌آمده، داده‌های تابش SARAH از دقت بالایی در برآورد تابش خورشیدی در سطح همه ایستگاه‌های مورد مطالعه برخوردار بودند. در ایستگاه‌ تبریز خطای تخمین تابش در مقایسه با ایستگاه‌های دیگر کمتر بود. با توجه به معیار ارزیابی انحراف استاندارد عمومی (GSD)، در همه ایستگاه‌ها، برآورد تابش در فصل تابستان و زمستان به ترتیب کمترین (5/2-12/6 = GSD) و بیشترین (2/25-2/18 = GSD) مقدار خطا را دارا بود. نتایج نشان داد که عواملی نظیر توپوگرافی و پوشش برف بر دقت تخمین داده‌های تابش SARAH تاثیرگذار می‌باشند.

کلیدواژه‌ها


عنوان مقاله [English]

Estimation of Solar Radiation Using SARAH Satellite Radiation Data in the Northwest of Iran

نویسندگان [English]

  • Hadi Ansari 1
  • safar marofi 2
1 PhD. Dept. of Water Resource Engineering, Bu-Ali Sina University, Hamedan
2 Professor, Department of Water Resource Engineering, Faculty of Agriculture, Bu-Ali Sina University, Hamedan
چکیده [English]

Accurate determination of the amount of incoming solar radiation at Earth’s surface is important for both climate studies and solar power applications. Satellite-based datasets of solar radiation offer wide spatial and temporal coverage, but careful validation of their quality is a necessary prerequisite for reliable utilization. In this study, daily SARAH satellite data was used to estimate daily solar radiation at weather stations in northwest Iran in 2009 and 2010. According to the results, SARAH radiation data had a high accuracy in estimating solar radiation at all five stations. At the Tabriz station, the error of estimation of radiation was less than that of other stations. According to GSD evaluation criteria, in each station, the estimation error in summer and winter was the lowest (GSD = 6.2 - 12.5) and the highest (GSD = 18.2-25.2) respectively. The results showed that factors such as topography and snow cover affect the accuracy of SARAH radiation data estimation.

کلیدواژه‌ها [English]

  • Northwestern Iran
  • SARAH
  • Snow Cover
  • Solar Radiation
  • Topography
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