東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

The oxygen isotope composition of di...

Colman, Albert Smith.

Linked to FindBook

Google Book

Amazon

博客來

The oxygen isotope composition of dissolved inorganic phosphate and the marine phosphorus cycle.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	The oxygen isotope composition of dissolved inorganic phosphate and the marine phosphorus cycle./
Author:	Colman, Albert Smith.
Description:	230 p.
Notes:	Director: Karl K. Turekian.
Contained By:	Dissertation Abstracts International63-03B.
Subject:	Biogeochemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3046137
ISBN:	0493603115

The oxygen isotope composition of dissolved inorganic phosphate and the marine phosphorus cycle.
Colman, Albert Smith.

The oxygen isotope composition of dissolved inorganic phosphate and the marine phosphorus cycle. - 230 p.

Director: Karl K. Turekian.

Thesis (Ph.D.)--Yale University, 2002.

Phosphorus is a key nutrient often present in concentrations sufficiently low to limit or co limit primary production in natural aquatic environments. In eutrophic settings, anthropogenic phosphorus loadings can contribute to hypoxia and toxic algal blooms. On a global scale over millennial time scales and longer, phosphorus availability in the oceans has been invoked as a control on export production and organic carbon burial with feedbacks on atmospheric CO2 and O2 levels.

ISBN: 0493603115Subjects--Topical Terms:

545717
Biogeochemistry.

The oxygen isotope composition of dissolved inorganic phosphate and the marine phosphorus cycle.
LDR:03233nam 2200301 a 45 001 929434
005 20110427
008 110427s2002 eng d
020 $a 0493603115
035 $a (UnM)AAI3046137
035 $a AAI3046137
040 $a UnM $c UnM
100 1 $a Colman, Albert Smith. $3 1252920
245 1 0 $a The oxygen isotope composition of dissolved inorganic phosphate and the marine phosphorus cycle.
300 $a 230 p.
500 $a Director: Karl K. Turekian.
500 $a Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1222.
502 $a Thesis (Ph.D.)--Yale University, 2002.
520 $a Phosphorus is a key nutrient often present in concentrations sufficiently low to limit or co limit primary production in natural aquatic environments. In eutrophic settings, anthropogenic phosphorus loadings can contribute to hypoxia and toxic algal blooms. On a global scale over millennial time scales and longer, phosphorus availability in the oceans has been invoked as a control on export production and organic carbon burial with feedbacks on atmospheric CO2 and O2 levels.
520 $a This dissertation encompasses two different approaches to the study of the marine phosphorus cycle. The first half of the dissertation focuses on the oxygen isotope composition of dissolved inorganic phosphate (P<italic> i</italic>) in natural waters. A technique is developed that permits the measurement of the δ<super>18</super>O of P<italic>i</italic> with a high degree of accuracy and an analytical reproducibility of 0.2–0.3&permil; (1 s.d.). Measured δ<super>18</super>O values for P<italic>i</italic> span a 9&permil; range from mid-latitude river water to coastal waters from Long Island Sound to deep water from the Pacific and Atlantic Oceans. P<italic> i</italic> was found to be near to a temperature dependent isotopic equilibrium with water oxygen in all parts of the ocean. Both equilibrium conditions and small deviations from equilibrium values provided useful information regarding the kinetics of phosphate transport and biological turnover in aquatic ecosystems.
520 $a The second half of the dissertation focuses on a critical but previously overlooked global flux of phosphate into the oceans. This flux is the benthic regenerative flux of P<italic>i</italic> from reactive particulate phosphorus phases deposited to sediments, which was determined to be significantly larger than riverine inputs of dissolved phosphorus to the oceans. Small variations in the benthic regeneration efficiency of phosphate can translate to large changes in the oceanic phosphorus inventory on a time scale of 10,000 years. Furthermore, this return flux of phosphorus from sediments to ocean water was found to be sensitive to sediment redox conditions, supporting a hypothesis that phosphate may provide negative feedback stabilization of atmospheric oxygen levels on geologic time scales.
590 $a School code: 0265.
650 4 $a Biogeochemistry. $3 545717
650 4 $a Geochemistry. $3 539092
690 $a 0425
690 $a 0996
710 2 0 $a Yale University. $3 515640
773 0 $t Dissertation Abstracts International $g 63-03B.
790 $a 0265
790 1 0 $a Turekian, Karl K., $e advisor
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3046137