250 Bin Yıl Uzunluğundaki Van Gölü Çökelleri’nin Spektral Özellikleri: Milankoviç Döngüleri ve Onların Harmonikleri

Dünya’nın en büyük sodalı gölü olan Van Gölü, Doğu Anadolu Yüksek Platosu’nda yer almaktadır. ICDP projesi olan PALEOVAN kapsamında, Van Gölü’nden son 250 bin yılı ve 90 bin yılı temsil eden iki karot alınmıştır. Bu çalışmada, astronomik ve solar döngülerin etkileri ile oluştuğu düşünülen, iklimin yarı periyodik davranışını sınamak amacıyla Van Gölü çökelleri jeokimya verileri Lomb-Scargle Periodogramı (LSP) spektral yöntemi ile analiz edilmiştir. Elde edilen sonuçlar, Doğu Akdeniz LC21 çökel karotu ve Soreq ile Sofular Mağaraları speleotem duraylı izotop verileri LSP sonuçlarıyla karışılaştırılmıştır. Analizler Milankoviç döngülerini, harmoniklerini, Holosen Bond döngülerini ve Hallstadtzeit güneş döngüsünü vermiştir. Ancak, GÖ 11,5-75 bin yılları arasında 1500 yıllık bir döngü gözlenmemiştir.

Spectral Features of 250 kyr Long Lake Van Sediments: Milankovitch Cycles and Their Harmonics

Lake Van, which is the largest soda lake of the earth, lies in the Eastern Anatolian High Plateau. Two different composite cores, that span the last 250 kyr and 90 kyr, were drilled in Lake Van within the framework of PALEOVAN project (ICDP). In order to test the theories of quasi-periodic behavior of climate, generated by astronomical and solar forces, this study investigates the cycles in Lake Van sediment geochemistry data by the Lomb-Scargle Periodogram (LSP) spectral method. The results are correlated with the Eastern Mediterranean LC21 sediment core, Soreq and Sofular Cave speleothem stable isotope data with LSP results. The analyses show the presence of the Milankovitch cycles, harmonics of the Milankovitch cycles, Holocene Bond cycles and the Hallstadtzeit solar cycle. However, the results do not give a 1500 year cycle for 11.5-75 kyr BP interval.

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