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Biogeochemical cycling of DMS and DM...

del Valle, Daniela A.

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Biogeochemical cycling of DMS and DMSO in the surface ocean, with emphasis on the Ross Sea, Antarctica.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Biogeochemical cycling of DMS and DMSO in the surface ocean, with emphasis on the Ross Sea, Antarctica./
作者:	del Valle, Daniela A.
面頁冊數:	176 p.
附註:	Adviser: Ronald P. Kiene.
Contained By:	Dissertation Abstracts International69-02B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3302968
ISBN:	9780549489726

Biogeochemical cycling of DMS and DMSO in the surface ocean, with emphasis on the Ross Sea, Antarctica.
del Valle, Daniela A.

Biogeochemical cycling of DMS and DMSO in the surface ocean, with emphasis on the Ross Sea, Antarctica. - 176 p.

Adviser: Ronald P. Kiene.

Thesis (Ph.D.)--University of South Alabama, 2008.

Dimethylsulfide (DMS) is a biogenic sulfur gas that is emitted from the ocean to the atmosphere where it plays an important role in atmospheric chemistry and possibly climate regulation. Oceanic DMS emissions are controlled largely by its concentration in surface waters which are, in turn, controlled by complex biogeochemical processes that remain poorly understood. This dissertation deals with the temporal dynamics and vertical distribution of DMS and one of its degradation products, dimethylsulfoxide (DMSO), in the Ross Sea, Antarctica. During the spring, biological DMS consumption (BDMSC) did not respond to the rapid increase in DMS concentrations that accompanied the development of a Phaeocystis antarctica phytoplankton bloom and an increase in general bacterial activity, partially allowing DMS to accumulate. Quantification of the major loss processes for DMS (BDMSC, photolysis, and sea-air flux), showed that BDMSC was the most important removal pathway for DMS during the spring and summer bloom. Dissolved DMSO (DMSOd) and sulfate were the two main DMS metabolism products, together comprising 81-93% of the non-volatile products. Mixed layer (ML)-integrated DMSOd production from BDMSC dominated over its production from DMS photolysis during the P. antarctica bloom, while photolysis dominated before the bloom developed. Additionally, a hitherto unknown light-stimulated, particle-associated process was identified as an important source of DMSOd in surface waters. Higher DMSOd production in samples more prone to suffer light-induced stress supported the hypothesis that this process was related to stress-induced phytoplanktonic biosynthesis and release of DMSO. In the Ross Sea, the surface ML was characterized by higher DMS and DMSOd concentrations, slower DMS turnover times from BDMSC, and higher DMSO yields from BDMSC, compared to that found below the pyncnocline. Higher DMSO yields in the ML, a feature also observed in the Sargasso Sea, is suggested to be partially caused by a community response to higher UV radiation in that layer. In this dissertation, several physical, biological and chemical factors were identified that affect DMS and DMSO biogeochemistry in an understudied and important oceanic system, the Ross Sea. The significance of these factors in controlling sulfur dynamics are discussed in the context of the global marine DMS(O) cycles.

ISBN: 9780549489726Subjects--Topical Terms:

545717
Biogeochemistry.

Biogeochemical cycling of DMS and DMSO in the surface ocean, with emphasis on the Ross Sea, Antarctica.
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