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Investigations of the Biogeochemical...

Chan, Eric W.

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Investigations of the Biogeochemical and Stable Isotope Kinetics of Aerobic Methane Oxidation in Seawater.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Investigations of the Biogeochemical and Stable Isotope Kinetics of Aerobic Methane Oxidation in Seawater./
作者:	Chan, Eric W.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	157 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
Contained By:	Dissertation Abstracts International79-04B(E).
標題:	Chemical oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10642926
ISBN:	9780355563160

Investigations of the Biogeochemical and Stable Isotope Kinetics of Aerobic Methane Oxidation in Seawater.
Chan, Eric W.

Investigations of the Biogeochemical and Stable Isotope Kinetics of Aerobic Methane Oxidation in Seawater. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 157 p.

Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.

Thesis (Ph.D.)--University of Rochester, 2017.

This item is not available from ProQuest Dissertations & Theses.

The largest global reservoir of CH4 that interacts with the ocean occurs in and below the seafloor. Investigations at locations of CH4 bubble emission from the seafloor have led to hypotheses surrounding whether the emission of methane from this massive reservoir will change with changing climate. Yet, aerobic methane oxidation in seawater may limit the atmospheric expression of seafloor-released methane. Here we examine aerobic methane oxidation (AMO) kinetics with three ultimate goals of determining: (1) the amounts of reactants required to remove a quantity of methane from seawater, (2) the fundamental isotopic fractionation parameters, and (3) how these properties may be spatially different.

ISBN: 9780355563160Subjects--Topical Terms:

516760
Chemical oceanography.

Investigations of the Biogeochemical and Stable Isotope Kinetics of Aerobic Methane Oxidation in Seawater.
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245 1 0 $a Investigations of the Biogeochemical and Stable Isotope Kinetics of Aerobic Methane Oxidation in Seawater.
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300 $a 157 p.
500 $a Source: Dissertation Abstracts International, Volume: 79-04(E), Section: B.
500 $a Adviser: John D. Kessler.
502 $a Thesis (Ph.D.)--University of Rochester, 2017.
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a The largest global reservoir of CH4 that interacts with the ocean occurs in and below the seafloor. Investigations at locations of CH4 bubble emission from the seafloor have led to hypotheses surrounding whether the emission of methane from this massive reservoir will change with changing climate. Yet, aerobic methane oxidation in seawater may limit the atmospheric expression of seafloor-released methane. Here we examine aerobic methane oxidation (AMO) kinetics with three ultimate goals of determining: (1) the amounts of reactants required to remove a quantity of methane from seawater, (2) the fundamental isotopic fractionation parameters, and (3) how these properties may be spatially different.
520 $a As methane is oxidized microbially, 12CH4 is used at a slightly faster rate than 13CH4 thus causing fractionation. The magnitude of the isotopic fractionation is unique for this microbial oxidation process, so these systematic changes in isotopic abundances have been used to quantify the extent and rate of oxidation [e.g. Leonte et al., 2017]. To investigate the chemical and isotopic kinetics of AMO in seawater, a unique mesocosm incubation system (MIS) was developed with a Dissolved Gas Analyzer System (DGAS) to monitor the chemical and isotopic changes in real-time. This work examined AMO at three different environments, Sleeping Dragon seep field, Mississippi Canyon 118 (MC 118) (Lat. = 28° 51.129'N, Long. --88° 29.51'W) as well as inside the Hudson Canyon (HC), US Atlantic Margin at the upper boundary of the methane clathrate stability zone (Lat. = 39° 32.705'N, Long. = 72° 24.259'W) and outside the HC, not directly influenced by the methane seepage (Lat. = 39° 17.236'N, Long. = 72° 12.080'W). These results show that in both environments, methane was consumed aggressively after an initial lag, but the start of aggressive consumption varied based on location. The biogeochemical data can be used to determine a "Redfield ratio" for AMO. The ratio for MC118 was (123 +/- 73) : (182 +/- 111) : (15 +/- 11) : (1) (DO:CH 4:N:P), which was found to be statistically consistent between the different environments. This ratio can be used to estimate the total capacity for AMO following a methane release. Isotopic fractionation factors were determined to change with different chemical conditions but did not display changes in isotopic fractionation with the stage of microbial growth.
590 $a School code: 0188.
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