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Refinement of the Branched GDGT Paleoenvironmental Proxy through Complementary Analytical Approaches.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Refinement of the Branched GDGT Paleoenvironmental Proxy through Complementary Analytical Approaches./
作者:	Sosa, Pablo Martinez.
面頁冊數:	1 online resource (174 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-02, Section: B.
Contained By:	Dissertations Abstracts International84-02B.
標題:	Organic chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29325219click for full text (PQDT)
ISBN:	9798841731542

Refinement of the Branched GDGT Paleoenvironmental Proxy through Complementary Analytical Approaches.
Sosa, Pablo Martinez.

Refinement of the Branched GDGT Paleoenvironmental Proxy through Complementary Analytical Approaches. - 1 online resource (174 pages)

Source: Dissertations Abstracts International, Volume: 84-02, Section: B.

Thesis (Ph.D.)--The University of Arizona, 2022.

Includes bibliographical references

Molecular fossils, known as biomarkers, are useful tools that allow us to make robust inferences about past climate through the geological record. Among these, glycerol dialkyl glycerol tetraethers (GDGTs) stand out as presenting sensitivity to environmental changes while being globally abundant in environments ranging from marine sediments to soils.The two main types of GDGTs, branched and isoprenoid, are generally considered to be sensitive to environmental parameters in specific settings. In marine sediments isoGDGTs respond to water temperature, while in terrestrial environments brGDGTs respond to temperature and pH. While the response of GDGTs to the environment has been empirically demonstrated, some uncertainties remain on the mechanism through which they capture the environment. This is particularly notable for brGDGTs, for which the source organisms are only partially understood. A better understanding on the production of these molecules can help us better understand the Earth's Climate System.The objective of this dissertation is to clarify and quantify the influence that environmental parameters have on the distribution of brGDGTs, particularly in freshwater environments. The results from this are then applied to a larger scale as the basis to generate a global brGDGT calibration for lakes. Finally, the unique response and distribution of all GDGTs observed in the previous chapter is used to generate a classification algorithm for both marine and terrestrial environments in the geological record. We hope that this work generates a better understanding of the biology and ecology of the GDGT source organisms, and how we can use this knowledge to reconstruct past environments.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798841731542Subjects--Topical Terms:

523952
Organic chemistry.
Subjects--Index Terms:

BiomarkersIndex Terms--Genre/Form:

542853
Electronic books.

Refinement of the Branched GDGT Paleoenvironmental Proxy through Complementary Analytical Approaches.
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