Geri Dön

The effect of global climate change on the release of terrestrial organic carbon in the arctic region

Başlık çevirisi mevcut değil.

  1. Tez No: 402170
  2. Yazar: AYÇA DOĞRUL SELVER
  3. Danışmanlar: DR. BART VAN DONGEN, DR. STEPHEN BOULT
  4. Tez Türü: Doktora
  5. Konular: Coğrafya, Tıbbi Ekoloji ve Klimatoloji, Geography, Medical Ecology and Climatology
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2014
  8. Dil: İngilizce
  9. Üniversite: The University of Manchester
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 170

Özet

Özet yok.

Özet (Çeviri)

The Arctic Region is currently experiencing an amplified warming if compared to the rest of the world. The soils in this region store approximately half of the global soil organic carbon (OC), mainly locked in the permanently-frozen ground (permafrost). This carbon sink is sensitive to global warming meaning that the predicted warming will likely increase the thaw-release of this 'old' carbon. However, what happens to this remobilized OC once it is transported to the Arctic Ocean, including the potential conversion to greenhouse gasses causing a positive feedback to climate warming, remains unclear. In this work, we further investigate the fate of terrestrial derived OC (terrOC) in the Eurasian Arctic Region. The key findings of this work are:  Glycerol dialkyl glycerol tetraethers (GDGTs) and bacteriohopanepolyols (BHPs) are present in marine sediments of the Eurasian Arctic Region and the associated Branched and Isoprenoidal tetraether (BIT) and Rsoil indices can be used to trace terrOC in marine realm. However, a slight modification in the Rsoil index is suggested (R'soil). Analyses indicate that the behaviour of BIT is largely controlled by a marine GDGT contribution while the R'soil index is mainly controlled by the removal of soil marker BHPs. Although both indices suggest a non-conservative behavior for the terrOC, this leads to differences in the estimations for the percentage terrOC present. A multi-proxy approach is essential since the use of a single-proxy approach can lead to over/under estimation. Comparison of BIT and 13Csoc indices across the East Siberian Shelf indicates that the BIT index is possibly reflecting a predominantly fluvial input while 13Csoc represents a mixed fluvial and coastal erosion input. The macromolecular terrOC composition varies along a west-east Eurasian Arctic climosequence and is mainly controlled by the river runoff of surface derived terrOC and wetland coverage (sphagnum vs. higher plants) but is not affected by the presence/absence of continuous permafrost. The phenols/(phenols+pyridines) ratio was suggested as a proxy to trace terrOC at the macromolecular level along the Kolyma River-East Siberian Sea transect. The results indicate a non-conservative behavior of the macromolecular terrOC comparable to the bulk of the terrOC. All molecular analyses/based proxies used showed that the remobilized terrOC in the Eurasian Arctic region behaves non-conservatively potentially causing a positive feedback to global climate change.

Benzer Tezler

  1. Evsel atık su arıtma tesislerinden kaynaklanan sera gazı salımının tahmini

    Estimation of greenhouse gas emission from domestic wastewater treatment plants

    HAZAL GÜLHAN

    Yüksek Lisans

    Türkçe

    Türkçe

    2017

    Çevre Mühendisliğiİstanbul Teknik Üniversitesi

    Çevre Mühendisliği Ana Bilim Dalı

    PROF. DR. İZZET ÖZTÜRK

  2. Gemi kaynaklı egzoz emisyonları azaltma yöntemlerinin karşılaştırmalı analizi

    Comparative analysis of ship-based exhaust emissions reduction methods

    EMİR EJDER

    Yüksek Lisans

    Türkçe

    Türkçe

    2020

    Denizcilikİstanbul Teknik Üniversitesi

    Deniz Ulaştırma Mühendisliği Ana Bilim Dalı

    PROF. DR. YASİN ARSLANOĞLU

  3. Gemi turboşarjır sisteminin risk ve enerji verimliliğinindeğerlendirilmesi

    Evaluation of risk and energy efficiency of marine turbocharger system

    ÇAĞATAY SERÇE

    Yüksek Lisans

    Türkçe

    Türkçe

    2023

    Denizcilikİstanbul Teknik Üniversitesi

    Deniz Ulaştırma Mühendisliği Ana Bilim Dalı

    PROF. DR. YASİN ARSLANOĞLU

  4. Küresel ısınmanın Arap turistlerin destinasyon tercihlerine etkisi üzerine nitel bir araştırma: Uzungöl örneği

    A qualitative study on the effect of global warming on the destination preferences of Arab tourists: Uzungöl example

    MURAT ÇAK

    Yüksek Lisans

    Türkçe

    Türkçe

    2024

    EkonomiKaramanoğlu Mehmetbey Üniversitesi

    İktisat Ana Bilim Dalı

    DOÇ. DR. ZAFER YILDIZ

  5. İklim değişikliği sonucu yükselen deniz seviyelerine çözümler: Yüzen yapılar ve yerleşimler için konsept bir model önerisi

    Solutions to rising sea levels as a result of climate change: A concept model proposal for floating structures and settlements

    IŞIL İNCE

    Yüksek Lisans

    Türkçe

    Türkçe

    2023

    Mimarlıkİstanbul Teknik Üniversitesi

    Kentsel Tasarım Ana Bilim Dalı

    DR. ÖĞR. ÜYESİ İSMAİL EREN KÜRKÇÜOĞLU