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Processes controlling carbon dioxide...

Carrillo, Christopher John.

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Processes controlling carbon dioxide in seawater.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Processes controlling carbon dioxide in seawater./
作者:	Carrillo, Christopher John.
面頁冊數:	229 p.
附註:	Chair: David M. Karl.
Contained By:	Dissertation Abstracts International63-03B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3045415
ISBN:	0493593926

Processes controlling carbon dioxide in seawater.
Carrillo, Christopher John.

Processes controlling carbon dioxide in seawater. - 229 p.

Chair: David M. Karl.

Thesis (Ph.D.)--University of Hawaii, 2002.

Although the solution chemistry of carbon dioxide (CO2) in seawater has been extensively studied during the past century, many questions still persist regarding the ecological understanding of the observed variability of the measured CO2 parameters; pH, fugacity of CO2 (fCO2), dissolved inorganic carbon (DIC) and total alkalinity (TA). At equilibrium, these four measurable parameters combined with the proper apparent equilibrium constants for carbonic acid in seawater describe the speciation concentrations of dissolved aqueous CO2 (CO2*(aq)), bicarbonate (HCO3<super>−</super>) and carbonate (CO 3<super>2−</super>). The observed variability of the measured CO2 parameters within the environment must be interpreted within the proper framework of assumptions relating the solution chemistry to the physical, chemical and biological processes that alter CO2 concentrations. This requires a cross discipline understanding of the effects of biology and physics on the CO2 solution chemistry in seawater.

ISBN: 0493593926Subjects--Topical Terms:

545717
Biogeochemistry.

Processes controlling carbon dioxide in seawater.
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100 1 $a Carrillo, Christopher John. $3 1251716
245 1 0 $a Processes controlling carbon dioxide in seawater.
300 $a 229 p.
500 $a Chair: David M. Karl.
500 $a Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1206.
502 $a Thesis (Ph.D.)--University of Hawaii, 2002.
520 $a Although the solution chemistry of carbon dioxide (CO2) in seawater has been extensively studied during the past century, many questions still persist regarding the ecological understanding of the observed variability of the measured CO2 parameters; pH, fugacity of CO2 (fCO2), dissolved inorganic carbon (DIC) and total alkalinity (TA). At equilibrium, these four measurable parameters combined with the proper apparent equilibrium constants for carbonic acid in seawater describe the speciation concentrations of dissolved aqueous CO2 (CO2*(aq)), bicarbonate (HCO3<super>−</super>) and carbonate (CO 3<super>2−</super>). The observed variability of the measured CO2 parameters within the environment must be interpreted within the proper framework of assumptions relating the solution chemistry to the physical, chemical and biological processes that alter CO2 concentrations. This requires a cross discipline understanding of the effects of biology and physics on the CO2 solution chemistry in seawater.
520 $a Photosynthesis alters seawater CO2 chemistry by reducing dissolved aqueous CO2 to organic matter. This results in a decrease of fCO 2 pressure and DIC concentration. Temperature alters seawater CO 2 chemistry through changes of the equilibrium constants that determine the partitioning of the inorganic carbon species; dissolved aqueous CO 2, bicarbonate and carbonate. The interaction of these two processes on timescales of seconds to years is a major theme of this dissertation. Additionally, the timescale of exchange for CO2 across an atmosphere-seawater interface can greatly influence the interpretation of observations within natural settings.
520 $a The interaction of these processes was studied in three contrasting systems to illustrate the similarities and differences, and to reveal an unexpected complexity. For instance, the observed decrease of normalized DIC (to a salinity of 35) at Station ALOHA within the North Pacific Subtropical Gyre was the result of the thermodynamic control on the solution chemistry of CO2 in seawater. In the region west of the Antarctic Peninsula, CO 2 dynamics were a function of temperature changes and dilution due to ice melt, as well as net photosynthesis. Finally, CO2 chemistry was studied in a temperature-controlled continuous culture. Many results from such studies are applied to open ocean process yet these studies may be flawed because of improper assumptions concerning gas-solution equilibrium and thermodynamic equilibrium.
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791 $a Ph.D.
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