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Journals / Türkiye Jeoloji Bülteni / 2017 / Türkiye'de Kuvaterner Araştırmaları

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

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

Z. Bora Ön
M. Sinan Özeren
Sena Akçer Ön
M. Namık Çağatay
Pages
471–488
Publication Date
2017-12-29
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

However, the results do not give a 1500 year cycle for 11.5-75 kyr BP interval.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Lake Van, which is the largest soda lake of the earth, lies in the Eastern Anatolian High Plateau.
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Key Findings & Data: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).
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Conclusion & Impact:However, the results do not give a 1500 year cycle for 11.5-75 kyr BP interval.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Doğu Akdeniz · Holosen Bond döngüleri · Lomb-Scargle periyodogramı

Abstract

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.

Özet

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.

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Cite This Article

Ön, Z. B., Özeren, M. S., Ön, S. A., Çağatay, M. N. (2017). Spectral Features of 250 kyr Long Lake Van Sediments: Milankovitch Cycles and Their Harmonics. Türkiye Jeoloji Bülteni, Türkiye'de Kuvaterner Araştırmaları, 471–488. https://ajindex.com/articles/18017

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References (11)

  1. Alley, R.B., Anandakrishnan, S., Jung, P., 2001. Stochastic resonance in the North Atlantic. Paleoceanography 16, 190-198.
  2. Badertscher, S., Fleitmann, D., Cheng, H., Edwards, R.L., Göktürk, O.M., Zumbühl, A., Leuenberger, M. and Tüysüz, O., 2011. Pleistocene water intrusions from the Mediterranean and Caspian seas into the Black Sea. Nature Geoscience, 4(4), 236-239.
  3. Bar-Matthews, M., Ayalon, A., Gilmour, M., Matthews, A., Hawkesworth, C.J., 2003. Sea–land oxygen isotopic relationships from planktonic foraminifera and speleothems in the Eastern Mediterranean region and their implication for paleorainfall during interglacial intervals. Geochimica et Cosmochimica Acta 67, 3181-3199.
  4. Bard, E. 2004. Greenhouse effect and ice ages: historical perspective. Comptes Rendus Geoscience 336:603–638
  5. Baumgarten, H., Wonik, T., 2014. Cyclostratigraphic studies of sediments from Lake Van (Turkey) based on their uranium contents obtained from downhole logging and paleoclimatic implications. Int J Earth Sci (Geol Rundsch), 1-16.
  6. Beaufort, L., de Garidel-Thoron, T., Mix, A.C., Pisias, N.G., 2001. ENSO-like Forcing on Oceanic Primary Production During the Late Pleistocene. Science 293, 2440-2444.
  7. Berger, A. 1973. Théorie Astronomique des Paléoclimats. Dissertation doctorale, Université catholique de Louvain, Belgium, 2 volumes. Berger, A. 1977. Support for the astronomical theory of climate change. Nature, 269, 44–45.
  8. Berger, A. 2012. A Brief History of the Astronomical Theories of Paleoclimates. In Climate Change (pp. 107–129). Vienna: Springer Vienna. Bianchi, G.G., McCave, I.N., 1999. Holocene periodicity in North Atlantic climate and deep-ocean flow south of Iceland. Nature 397, 515-517.
  9. Bond, G., Kromer, B., Beer, J., Muscheler, R., Evans, M.N., Showers, W., Hoffmann, S., Lotti-Bond, R., Hajdas, I., Bonani, G., 2001. Persistent Solar Influence on North Atlantic Climate During the Holocene. Science 294, 2130-2136.
  10. Bond, G., Showers, W., Cheseby, M., Lotti, R., Almasi, P., deMenocal, P., Priore, P., Cullen, H., Hajdas, I., Bonani, G., 1997. A Pervasive Millennial-Scale Cycle in North Atlantic Holocene and Glacial Climates. Science 278, 1257-1266.
  11. Bond, G. C., Showers, W., Elliot, M., Evans, M., Lotti, R., Hajdas, I., Johnson, S. 1999. The North Atlantic’s 1-2 Kyr Climate Rhythm: Relation to Heinrich Events, Dansgaard/Oeschger Cycles and the Little Ice Age. In P. U. Clark, R. S. Webb, L. D. Keigwin (Eds.), Mechanisms of Global Climate Change at Millennial Time Scales (p