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A spatial deconvolution of molecular...

Meador, Travis Blake.

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A spatial deconvolution of molecular signals in oceanic dissolved organic matter.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	A spatial deconvolution of molecular signals in oceanic dissolved organic matter./
作者:	Meador, Travis Blake.
面頁冊數:	220 p.
附註:	Adviser: Lihini Aluwihare.
Contained By:	Dissertation Abstracts International68-12B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3295019
ISBN:	9780549401698

A spatial deconvolution of molecular signals in oceanic dissolved organic matter.
Meador, Travis Blake.

A spatial deconvolution of molecular signals in oceanic dissolved organic matter. - 220 p.

Adviser: Lihini Aluwihare.

Thesis (Ph.D.)--University of California, San Diego, 2007.

This thesis provides chemical characterization data for ultrafiltered dissolved organic matter (UDOM) isolated from multiple depths in the western equatorial Atlantic and subtropical Pacific Oceans, the Southern California Bight, and the Benguela upwelling regime (n = 80). Multiple chemical characterization measurements were performed on this large set of UDOM samples including elemental analysis, stable C and N isotopic composition (delta13C and delta15N), radiocarbon analysis, 1H-NMR spectroscopy, monosaccharide composition, and novel application of several protein quantification methods. Most samples were collected as part of an extensive field program aimed at describing the biocomplexity of ocean ecosystems. Therefore, complementary data collected as part of this field program enabled a uniquely comprehensive assessment of relationships between physical-biological variables and DOM composition.

ISBN: 9780549401698Subjects--Topical Terms:

545717
Biogeochemistry.

A spatial deconvolution of molecular signals in oceanic dissolved organic matter.
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100 1 $a Meador, Travis Blake. $3 1266963
245 1 2 $a A spatial deconvolution of molecular signals in oceanic dissolved organic matter.
300 $a 220 p.
500 $a Adviser: Lihini Aluwihare.
500 $a Source: Dissertation Abstracts International, Volume: 68-12, Section: B, page: 7878.
502 $a Thesis (Ph.D.)--University of California, San Diego, 2007.
520 $a This thesis provides chemical characterization data for ultrafiltered dissolved organic matter (UDOM) isolated from multiple depths in the western equatorial Atlantic and subtropical Pacific Oceans, the Southern California Bight, and the Benguela upwelling regime (n = 80). Multiple chemical characterization measurements were performed on this large set of UDOM samples including elemental analysis, stable C and N isotopic composition (delta13C and delta15N), radiocarbon analysis, 1H-NMR spectroscopy, monosaccharide composition, and novel application of several protein quantification methods. Most samples were collected as part of an extensive field program aimed at describing the biocomplexity of ocean ecosystems. Therefore, complementary data collected as part of this field program enabled a uniquely comprehensive assessment of relationships between physical-biological variables and DOM composition.
520 $a Nitrogen (N) isotope dynamics are a common theme in all chapters and these data were used to study the flow of N within the microbial loop of the upper ocean and through the DOM reservoir. delta15N-UDOM showed remarkable homogeneity over this vast spatial array when compared to the delta15N dynamics of the short-lived particulate N reservoir suggesting that dissolved organic nitrogen (DON) contributed by contemporary processes does not accumulate in the upper ocean. Further isotopic analyses of planktonic nucleic acids (NA) and the protein component of DON provided evidence for the rapid recycling of DON contributed by diazotrophs in these regions characterized by extremely low concentrations of inorganic N. N isotope fractionation effects associated with the biosynthesis of NA by marine phytoplankton were also examined in one chapter to establish the validity of using delta15N-NA of size-fractionated field assemblages to identify biological sinks for dissolved organic nitrogen (DON).
520 $a Basin-wide comparisons of chemical composition data revealed significant differences in delta15N-UDON between the subtropical N. Atlantic (avg.+/-s.d. = 4.1+/-0.6&permil;) and Pacific Oceans (5.3+/-0.8&permil; and 15.0+/-1.4, p < 0.001). The Atlantic Ocean UDOM samples also exhibited higher C/N ratios (16.1+/-1.5) than those in the Pacific (15.0+/-1.4, p < 0.05), and significant differences in the monosaccharide composition of UDOM were observed both between and within these basins. Principal component analyses allowed preliminary identification of specific biological imprints on DOM composition particularly in regions dominated by diazotrophs. Furthermore, molecular level characterization combined with radiocarbon signatures of UDOM allowed for a novel assessment of UDOM reactivity, and together, these basin-wide observations provided new insights into the flow of C and N through the UDOM reservoir.
520 $a This thesis has begun to interpret the information recorded in the chemical composition of DOM as it relates to the environmental processing of C and N in the ocean. New observations made in each chapter are the product of analytical approaches that combine a variety of environmental and DOM composition data over large spatial expanses in the ocean. This focus on producing a more complete chemical portrait of DOM through the simultaneous measurement of multiple parameters enabled this study to identify several processes that impart compositional variability to UDOM.
590 $a School code: 0033.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Biology, Oceanography. $3 783691
650 4 $a Geochemistry. $3 539092
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710 2 $a University of California, San Diego. $b Earth Sciences. $3 1035583
773 0 $t Dissertation Abstracts International $g 68-12B.
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790 1 0 $a Aluwihare, Lihini, $e advisor
790 1 0 $a Azam, Farooq $e committee member
790 1 0 $a Barbeau, Kathy $e committee member
790 1 0 $a Esko, Jeff $e committee member
790 1 0 $a Palenik, Brian $e committee member
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3295019