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Natural abundance radiocarbon studie...

de Jesus, Roman Paul.

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Natural abundance radiocarbon studies of dissolved organic carbon (DOC) in the marine environment.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Natural abundance radiocarbon studies of dissolved organic carbon (DOC) in the marine environment./
Author:	de Jesus, Roman Paul.
Description:	227 p.
Notes:	Adviser: Lihini I. Aluwihare.
Contained By:	Dissertation Abstracts International69-01B.
Subject:	Biogeochemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3291991
ISBN:	9780549402435

Natural abundance radiocarbon studies of dissolved organic carbon (DOC) in the marine environment.
de Jesus, Roman Paul.

Natural abundance radiocarbon studies of dissolved organic carbon (DOC) in the marine environment. - 227 p.

Adviser: Lihini I. Aluwihare.

Thesis (Ph.D.)--University of California, San Diego, 2008.

Marine dissolved organic carbon (DOC), an active reservoir in the global carbon cycle, has an average age of 6000 years and is comprised of biochemicals which may or may not cycle on different time scales. The primary objective of this thesis is to investigate the relationship between radiocarbon ( 14C) signature and chemical composition of various fractions within DOC. Specifically, this thesis was designed to provide an analytical framework to explicitly explore the relationship between DOC molecular weight, chemical composition, and reactivity. Chapter 2 describes spatial and temporal total organic carbon (TOC) concentration gradients in 2005 from the California Cooperative Fisheries Oceanic Cooperative (CalCOFI) region, which is the main study area for this thesis. Chapter 3 describes a novel solid phase extraction (SPE) method and reports the chemical and isotopic characteristics of fractionated DOC components based on their solubility. These fractions are compared to DOC isolated by the widely applied UF techniques and the results indicate that chemical composition and 14C content were related. Using compound specific isotope analysis (CSIA) of sugars and lipids, Chapter 4 shows that both SPE DOC and UDOC contain specific compounds with similar chemical and isotopic characteristics and residence times. In Chapter 5, CSIA was applied to SPE samples collected from the Delaware River and Estuary and the terrestrially influenced Eel River Margin to examine whether riverine DOC inputs contribute specific compounds or common components to the coastal ocean. Finally, the final chapter discusses the implications and significance of these results for marine DOC cycling.

ISBN: 9780549402435Subjects--Topical Terms:

545717
Biogeochemistry.

Natural abundance radiocarbon studies of dissolved organic carbon (DOC) in the marine environment.
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005 20110520
008 110520s2008 ||||||||||||||||| ||eng d
020 $a 9780549402435
035 $a (UMI)AAI3291991
035 $a AAI3291991
040 $a UMI $c UMI
100 1 $a de Jesus, Roman Paul. $3 1266981
245 1 0 $a Natural abundance radiocarbon studies of dissolved organic carbon (DOC) in the marine environment.
300 $a 227 p.
500 $a Adviser: Lihini I. Aluwihare.
500 $a Source: Dissertation Abstracts International, Volume: 69-01, Section: B, page: 0180.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2008.
520 $a Marine dissolved organic carbon (DOC), an active reservoir in the global carbon cycle, has an average age of 6000 years and is comprised of biochemicals which may or may not cycle on different time scales. The primary objective of this thesis is to investigate the relationship between radiocarbon ( 14C) signature and chemical composition of various fractions within DOC. Specifically, this thesis was designed to provide an analytical framework to explicitly explore the relationship between DOC molecular weight, chemical composition, and reactivity. Chapter 2 describes spatial and temporal total organic carbon (TOC) concentration gradients in 2005 from the California Cooperative Fisheries Oceanic Cooperative (CalCOFI) region, which is the main study area for this thesis. Chapter 3 describes a novel solid phase extraction (SPE) method and reports the chemical and isotopic characteristics of fractionated DOC components based on their solubility. These fractions are compared to DOC isolated by the widely applied UF techniques and the results indicate that chemical composition and 14C content were related. Using compound specific isotope analysis (CSIA) of sugars and lipids, Chapter 4 shows that both SPE DOC and UDOC contain specific compounds with similar chemical and isotopic characteristics and residence times. In Chapter 5, CSIA was applied to SPE samples collected from the Delaware River and Estuary and the terrestrially influenced Eel River Margin to examine whether riverine DOC inputs contribute specific compounds or common components to the coastal ocean. Finally, the final chapter discusses the implications and significance of these results for marine DOC cycling.
590 $a School code: 0033.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Chemistry, Organic. $3 516206
690 $a 0425
690 $a 0490
710 2 $a University of California, San Diego. $b Oceanography. $3 1019111
773 0 $t Dissertation Abstracts International $g 69-01B.
790 $a 0033
790 1 0 $a Aluwihare, Lihini I., $e advisor
790 1 0 $a Druffel, Ellen $e committee member
790 1 0 $a Fenical, William $e committee member
790 1 0 $a Mitchell, B. Greg $e committee member
790 1 0 $a Prather, Kim $e committee member
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3291991