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Reconstructing Paleoclimates & Paleo...

Colcord, Devon E.

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Reconstructing Paleoclimates & Paleoenvironments via Biomarkers in Lacustrine Sediments.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Reconstructing Paleoclimates & Paleoenvironments via Biomarkers in Lacustrine Sediments./
作者:	Colcord, Devon E.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	181 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-09, Section: B.
Contained By:	Dissertations Abstracts International80-09B.
標題:	Climate Change. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13806412
ISBN:	9780438961012

Reconstructing Paleoclimates & Paleoenvironments via Biomarkers in Lacustrine Sediments.
Colcord, Devon E.

Reconstructing Paleoclimates & Paleoenvironments via Biomarkers in Lacustrine Sediments. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 181 p.

Source: Dissertations Abstracts International, Volume: 80-09, Section: B.

Thesis (Ph.D.)--Indiana University, 2019.

This item must not be sold to any third party vendors.

This dissertation contributes to the understanding of how Earth's climate has changed in the past and assesses the impact of those changes on the evolution of lacustrine environments and ecosystems. Research on deciphering paleoclimates and paleoenvironments utilizes various geological archives, including ice cores, tree rings, marine sediments, and lake sediments, to reconstruct the timing and magnitude of past changes in climate and environments. This dissertation focuses on elucidation of paleoclimatic information derived from different biogeochemical proxies preserved in lacustrine sediments from Kangerlussuaq, Greenland, and Olduvai Gorge, Tanzania. Many biogeochemical proxies based on the molecular and isotopic compositions of organic compounds preserved in sedimentary archives represent established methods for determining past changes in climate. This proxy approach is based on recognition that the biological response of ecosystems to environmental change affects the composition of the organic compounds they produce, which survives in the sedimentary record. The influence of environmental controls on the characteristics of some of these paleoclimatic proxies, however, remains poorly understood, limiting their routine use. Chapter 2 focuses on this specific consideration, examining recent sediment cores from southwest Greenland to assess how the carbon isotopic composition of their branched glycerol dialkyl glycerol tetraethers (brGDGTs), a potentially invaluable paleotemperature proxy, can help improve understanding of the sources of these compounds and controls on their distributions in lacustrine settings. In the subsequent chapters, a variety of biogeochemical proxies are used to reconstruct past changes in the environment of Olduvai Gorge, a site in East Africa world-renowned for discoveries of multiple hominin fossils and associated stone tools. The objectives of this research are (i) to reconstruct the nature and rates of climate variations at this location from ∼1.86 Ma, which is a critical interval for East African climate corresponding to the development of the Walker Circulation, and (ii) to assess evidence for the response of terrestrial and aquatic ecosystems to climatic variations. In summary, research presented in this dissertation employs a suite of biogeochemical proxies in lacustrine sediments from Greenland and East Africa to advance our understanding of the timing, nature, and causes of past climate and environmental variability in these settings.

ISBN: 9780438961012Subjects--Topical Terms:

894284
Climate Change.

Reconstructing Paleoclimates & Paleoenvironments via Biomarkers in Lacustrine Sediments.
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