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An examination of the marine nitroge...

Batista, Fabian C.

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An examination of the marine nitrogen cycle: insights from novel stable nitrogen isotopic approaches.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	An examination of the marine nitrogen cycle: insights from novel stable nitrogen isotopic approaches./
作者:	Batista, Fabian C.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	233 p.
附註:	Source: Dissertation Abstracts International, Volume: 78-03(E), Section: B.
Contained By:	Dissertation Abstracts International78-03B(E).
標題:	Chemical oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10169233
ISBN:	9781369234480

An examination of the marine nitrogen cycle: insights from novel stable nitrogen isotopic approaches.
Batista, Fabian C.

An examination of the marine nitrogen cycle: insights from novel stable nitrogen isotopic approaches. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 233 p.

Source: Dissertation Abstracts International, Volume: 78-03(E), Section: B.

Thesis (Ph.D.)--University of California, Santa Cruz, 2016.

Paleoceanographic studies typically employ stable nitrogen isotopic measurements of total combustible N (delta15NTN) from marine sediments to infer temporal changes in surface ocean marine N dynamics. However, delta 15NTN is a highly non-specific measurement, susceptible to confounding issues including non-marine N sources, and offers little, if any, information regarding degradation and/or alteration of primary delta 15N signals. Recent development of novel biomarker and microfossil based proxies provide new analytical capabilities to circumvent issues with delta 15NTN.

ISBN: 9781369234480Subjects--Topical Terms:

516760
Chemical oceanography.

An examination of the marine nitrogen cycle: insights from novel stable nitrogen isotopic approaches.
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245 1 3 $a An examination of the marine nitrogen cycle: insights from novel stable nitrogen isotopic approaches.
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300 $a 233 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-03(E), Section: B.
500 $a Advisers: Matthew D. McCarthy; Ana C. Ravelo.
502 $a Thesis (Ph.D.)--University of California, Santa Cruz, 2016.
520 $a Paleoceanographic studies typically employ stable nitrogen isotopic measurements of total combustible N (delta15NTN) from marine sediments to infer temporal changes in surface ocean marine N dynamics. However, delta 15NTN is a highly non-specific measurement, susceptible to confounding issues including non-marine N sources, and offers little, if any, information regarding degradation and/or alteration of primary delta 15N signals. Recent development of novel biomarker and microfossil based proxies provide new analytical capabilities to circumvent issues with delta 15NTN.
520 $a Here, I explore the utility of compound specific nitrogen isotopic analysis of individual amino acids measurements (delta15NAA) of proteinaceous material isolated from marine sediments and deep-sea coral. With these data I infer past changes in nitrate delta15N fueling primary production at the base of the food web, ecosystem structure, and the extent of heterotrophic resynthesis influencing sedimentary and coral-skeletal delta 15NTN records. Within sediments and corals, I demonstrate that delta15NAA based parameters reflect that of sinking particles and surface collected planktonic biomass and thus serve as a robust, albeit complex proxy to infer ecosystem and nutrient dynamic changes for at least the last few hundred years on the California Margin. In sediments I find an unexpected delta15N offset in major operational fractions and molecular compound classes. This result (1) challenges a major assumption organic nitrogen in sediments is dominated by amide functionality (i.e., proteinaceous N) and (2) highlights possible issues with standard protein hydrolysis techniques.
520 $a Lastly, I analyze the delta15N composition of foraminifera-bound N (FB-delta15N) to assess the Plio-Pleistocene history of whole ocean nitrogen dynamics from the oligotrophic North Pacific for the last 5 million years. This region contains calcareous nannofossil rich sediments, ideal for preserved FB-delta15N records. These new FB-delta 15N records support an expansion of suboxic regions, consistent with previous evidence, but also indicate that the whole ocean delta15 N budget was stable throughout the Plio-Pleistocene. This latter result implies that kinetic isotopic fractionations of marine N transformations and the ratio of pelagic to benthic denitrification, must not have changed during the Plio-Pleistocene transition, despite drastic global scale changes in sea level, shelf area, and volume of the major oxygen deficient zones at this time.
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