Lake level and climate records of the last 90ka from the Northern Basin of Lake Van, eastern Turkey

Çağatay, M. Namık; Öğretmen, Nazik; Damcı, Emre; Stockhecke, Mona; Sancar, Ümmühan; Eriş, Kürşad Kadir; Ozeren, Sinan

doi:10.1016/j.quascirev.2014.09.027

Cited by 87 publications

(61 citation statements)

References 82 publications

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“…A likely trigger for such a local phenomenon is a southward extension of the Siberian High Pressure System (SHPS), a system nowadays centered north of the Lake Van region and characterized by cold and dry air originating from the interior of the Eurasian continent. This mechanism was proposed to explain dry conditions in the Lake Van region during glacial periods [ Cagatay et al ., ]. Besides, several studies point toward an exceptionally large east Siberian ice sheet during MIS 4 [ Baumann et al ., ; Svendsen et al ., ; Krinner et al ., ], which may have been the cause for a temporarily southward extension of the SHPS, bringing cool and dry air to the Lake Van region, causing the observed aridity.…”

Section: Discussionmentioning

confidence: 99%

Biomarkers in Lake Van sediments reveal dry conditions in eastern Anatolia during 110.000–10.000 years B.P.

Randlett

Bechtel

Meer

et al. 2017

Geochem Geophys Geosyst

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Lipid biomarkers were analyzed in Lake Van sediments covering the last 600 ka, with a focus on the period between 110 and 10 ka, when a broad maximum in pore water salinity as a relict from the past suggests dry conditions. The occurrence and distribution of biomarkers indicative for terrestrial plants (long‐chain n‐alkane C29), haptophyte algae (methyl alkenones C37) and halophilic archaea (archaeol) all point toward a dry climate in Lake Van region during this time interval. The hydrogen isotopic composition of C29 n‐alkanes (δDC29) and C37 alkenones (δDC37) is enriched between MIS 4 and MIS 2, which is interpreted as a decrease in the regional ratio of precipitation to evaporation. Similarly, the low abundance of the acyclic glycerol dialkyl glycerol tetraether GDGT‐0 relative to archaeol, quantified by the Archaeol and Caldarchaeol Ecometric (ACE) is assumed to reflect the presence of halophilic euryarchaeota adapted to high salinity water. The climate around Lake Van appears in phase with the Yammouneh basin 800 km southwest and Lake Urmia 250 km southeast of Lake Van over the last two glacial periods. The results highlight the potential of combining ACE, δDC29, and δDC37 for reconstructing salinity changes and regional precipitation to evaporation ratio from lake sediments.

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Section: Discussionmentioning

confidence: 99%

Biomarkers in Lake Van sediments reveal dry conditions in eastern Anatolia during 110.000–10.000 years B.P.

Randlett

Bechtel

Meer

et al. 2017

Geochem Geophys Geosyst

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“…High lake levels are apparent in warm interstadials/interglacials and low lake levels for the cold stadials/glacials . This pattern is reflected in TOC-rich brown laminated (TOC-poor gray bioturbated or banded) sediment containing high (low) Ca/K intensities Kwiecien et al, 2014;Ça gatay et al, 2014). Because the interstadial onsets are reported as a consistent universal pattern (Wang et al, 2008;Cheng et al, 2009;Deplazes et al, 2013) and can be clearly identified as increases in TOC/b* and Ca/K, only the onsets were aligned to the interstadial onsets of the NGRIP d 18 O record.…”

Section: Alignment Of Proxy Datamentioning

confidence: 99%

Chronostratigraphy of the 600,000 year old continental record of Lake Van (Turkey)

Stockhecke

Kwiecien

Vigliotti

et al. 2014

Quaternary Science Reviews

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“…Especially the intense erosional (humid) LGM period is also clearly evident in adjacent paleoclimate archives ( Figure 8). Despite a significant drop in Black Sea Level (Panin and Popescu, 2007), there is an apparent rise in lake levels (Lake Van;Çağatay et al, 2014;Lake Lisan, Torfstein et al, 2013;Lake Konya;Fontugne et al, 1999) and glaciers in Anatolian mountains advancing to their maximum (Sarıkaya and Çiner, 2015). Post-LGM, the region witnessed a severely cold and dry period, at ca.18.5±2.1 ka, which is evident in fluvial architecture of T1 and also with a 2 m thick loess deposit overlying the T2 terrace (Figure 5 B and D).…”

Section: Extended Summarymentioning

confidence: 99%

Yeşilırmak Taraçalarında (Orta Kuzey Anadolu) Geç Pleyistosen İklim Değişiklikleri ve Düşey Yönlü Deformasyona Akarsu Cevabının Araştırılması

Erturaç¹,

Kıyak²

2017

Türkiye Jeoloji Bülteni / Geological Bulletin of Turkey

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Öz: Fosilleşmiş taşkın ovası çökelleri olarak da tanımlanan akarsu taraça basamaklanması, akarsuların gelişim süreci üzerindeki iklim, kaide seviyesi ve genç tektonik etkinin analitik olarak belirlenmesi için önemli kayıtlar sunmaktadır. Bu çalışmanın odağında bulunan Yeşilırmak Nehri'nin Çekerek Irmağı ile birleştiği Geldingen Ovası'nın (Amasya) güney kesiminde, her iki akarsuyun kenarlarında bulunan depolanmalı taraça sistemi çalışılmıştır. Bu taraça sistemi, güncel nehir taşkın ovasından +70 metre üst kotlara kadar ulaşan üç basamaktan oluşmaktadır. Bu basamakların gelişim süreci, farklı seviyelerinden elde edilen toplam 12 adet örneğin lüminesans yöntemi kullanılarak tarihlendirilmesi ile araştırılmıştır.Elde edilen sonuçlar, taraça seviyelerinin Son Buzul Çağı içerisinde güncel taşkın ovasından T3 (+70), T2 (+35) ve T1(+15) metre göreceli konumlarda, sırasıyla MIS5a, MIS3 ve LGM sonu dönemleri içerisinde depolandığını ortaya koymaktadır. Elde edilen depolanmalı/aşınmalı dönemlerin, Türkiye ve yakın çevresinde gerçekleştirilen iklim değişikliği kayıtları ve Karadeniz seviye değişimleri ile karşılaştırılması, inceleme alanında taraça oluşumunun, son buzul dönemi içerisinde Doğu Akdeniz için tanımlanan yağışlı/kurak dönemlerle uyumlu olduğunu göstermektedir. Her üç taraçanın terkedilme zamanı ve konumu oranlandığında, Kuzey Anadolu Fayı Zonu'nun içbükey sıkışmalı bir büklüm yaptığı orta kesiminde ortalama 0.94±0.26 mm/yıl yükselme hızı hesaplanmaktadır.Abstract: River terraces are remnants of former river floodplains that are fossilized above present-day river channels, often in staircase systems. The formation of terrace staircases is attributed to both tectonic, climate and sea/base level changes. Variations in tectonic and climatic conditions cause perturbations in the fluvial system, which, over time, lead to widening of valley floors, aggradation and incision, thereby producing terraces representing the complex response of the fluvial system to the chances in variables listed above.This study reports on the formation of terrace staircases at Yeşilırmak River system of central northwest Anatolia, near Geldingen Plain (Amasya). The depositional steps reaching +70 m (above today's recent floodplain), have been mapped and dated by using luminescence method which reveals that terrace formation started at early late Pleistocene and continued within Last Glacial Period. The terrace steps, namely T3 (+70 m), T2 (+35 m) and T1 (+15) were deposited during MIS5a, MIS3 and end of LGM. The correlation with the adjacent climate archives reveals that the terraces are formed primarily in response to climatically induced fluctuations in river discharge and sediment supply. Relative positions of the terrace risers and abandonment ages, enables us to calculate a long-term vertical uplift rate of 0.94±0.26 mm/year at the study area, located to the south of the North Anatolian Fault Zone.

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Lake level and climate records of the last 90ka from the Northern Basin of Lake Van, eastern Turkey

Cited by 87 publications

References 82 publications

Biomarkers in Lake Van sediments reveal dry conditions in eastern Anatolia during 110.000–10.000 years B.P.

Biomarkers in Lake Van sediments reveal dry conditions in eastern Anatolia during 110.000–10.000 years B.P.

Chronostratigraphy of the 600,000 year old continental record of Lake Van (Turkey)

Yeşilırmak Taraçalarında (Orta Kuzey Anadolu) Geç Pleyistosen İklim Değişiklikleri ve Düşey Yönlü Deformasyona Akarsu Cevabının Araştırılması

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