Meteosat LSA SAF DIDSSF Ürününün Türkiye İçin Tutarlılığının Değerlendirilmesi

Year 2020, Volume: 1 Issue: 2, 85 - 96, 30.09.2020

Kazım Kaba , Derya Öztürk Çetni , Mustafa Kandırmaz

Abstract

Yeryüzüne gelen güneş radyasyonu, iklim, tarım, hidroloji ve enerji uygulamaları için büyük öneme sahiptir. Bu konularda yapılan çalışmalar için enerji değerlerinin zamansal ve alansal dağılımının bilinmesi dünya genelinde ihtiyaç duyulan bir bilgidir. Genel olarak güneş enerjisi ölçümleri meteoroloji istasyonlarında noktasal olarak gerçekleştirilmektedir. Son yıllarda yapılan çalışmalar göstermiştirki yüzeye gelen güneş enerjisi değerleri uydu verileri kullanılarak başarıyla tahmin edilebilmektedir. Meteosat uyduları Türkiye’yi de kapsayacak şekilde Avrupa ve Afrika’ya ait görüntüler kaydetmektedir. Bu kayıtlardan LSA SAF birimi tarafından yeryüzüne ait çeşitli parametreler tahmin edilmektedir. Bu parametrelerden biri olan yüzeye gelen günlük kısa dalga enerjinin tahmin edildiği DIDSSF verisidir. Bu çalışmanın amacı Türkiye için DIDSSF ürünün yer ölçümleri ile kıyaslayarak doğruluğunu belirlemektir. DIDSSF ürününün doğruluğu ülke coğrafyasına olabildiğince homojen dağılmış olan 46 adet MGM istasyonu ile ölçülen global güneş radyasyonu değerleri ile test edilmiştir. İstasyonlardan gelen değerler tek tek incelendiğinde, belirleme katsayısı olan R2’nin 0,7129 ila 0,9585 arasında değişim gösterdiği tespit edilmiştir. 46 adet istasyondan elde edilen ortalama R2 değeri ise 0,9058 olarak bulunmuştur.

Keywords

Güneş radyasyonu, DIDSSF, Meteosat, Türkiye, Validasyon

Evaluation of the Accuracy of Meteosat LSA SAF DIDSSF Product for Turkey

Abstract

The solar radiation that reaches to the surface of the Earth is of great importance for many applications such as climate, agriculture, hydrology and energy. Having knowledge on the temporal and spatial distribution of energy values is a worldwide need for the studies on these topics. Measurement of the solar radiation is generally carried out in a pointwise manner in meteorological stations. Recent studies show that solar radiation over large areas can be estimated successfully using satellite images. The Meteosat satellites record images of Europe and Africa, covering also Turkey. Using these records, the LSA SAF unit predicts various parameters that belongs to Earth. One of these parameters is the DIDSSF (daily downward surface short-wave flux), which predicts the daily short-wave radiation reaching to the Earth surface. This study aimed to evaluate the accuracy of the DIDSSF estimation for Turkey by comparing it against terrestrial measurements. The accuracy of the DIDSSF product was tested through the use of global solar radiation values measured at 46 MGM stations which were homogeneously distributed over the whole country as much as possible. Examination of the stations one by one revealed that the determination coefficient R2 varied between 0.7129 and 0.9585. The average R2 value obtained from 46 stations was found to be 0.9058.

Keywords

Solar radiation, DIDSSF, Meteosat, Turkey, Validation

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