國立虎尾科技大學 |

Using 210Po/210Pb Disequilibria to Characterize the Biogeochemistry and Quantify the Dynamics of Sea Ice in the Arctic.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Using 210Po/210Pb Disequilibria to Characterize the Biogeochemistry and Quantify the Dynamics of Sea Ice in the Arctic./
作者:	Krupp, Katherine.
面頁冊數:	1 online resource (90 pages)
附註:	Source: Masters Abstracts International, Volume: 57-01.
標題:	Geochemistry. -
電子資源:	click for full text (PQDT)
ISBN:	9780355242805

Using 210Po/210Pb Disequilibria to Characterize the Biogeochemistry and Quantify the Dynamics of Sea Ice in the Arctic.
Krupp, Katherine.

Using 210Po/210Pb Disequilibria to Characterize the Biogeochemistry and Quantify the Dynamics of Sea Ice in the Arctic. - 1 online resource (90 pages)

Source: Masters Abstracts International, Volume: 57-01.

Thesis (M.S.)--Wayne State University, 2017.

Includes bibliographical references

Understanding the biogeochemical cycles of the Arctic Ocean is highly significant due to its many unique characteristics which impact the cycling of important trace elements, isotopes, and nutrients. Furthermore, with its seasonally-changing sea ice extent and substantial role in the global radiation balance, the Arctic is considered a sensitive indicator of global change. The study of 210Po and 210Pb disequilibria is used to determine 1) the residence time of ice-rafted sediments in sea ice, 2) ice floe dynamics such as ice accumulation rates, and 3) biogeochemical characterization of the Arctic due to the natural occurrence and particle reactivity of 210Po and 210Pb. The "age" of ice-rafted sediments ranged from 56-136 days, and transport rates of 0.08 to 0.17 m/s were observed, consistent with previous reports, with the higher rates potentially influenced by non-conservative behavior of radionuclides during melt season. The mechanisms of isotopic disequilibria with depth in ice cores is not yet clearly understood, but model-based estimates of ice accumulation range from 0.08 -- 7 cm/d (mean = 1.4 cm/d). Wide-scale 210Po deficiency in water columns of the central and western Arctic (integrated AR's = 0.51+/- 0.07 and 0.56 +/- 0.07 for ST-30 and ST-43, respectively) indicate early summer export of 210Po with biogenic particles.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355242805Subjects--Topical Terms:

648291
Geochemistry.
Index Terms--Genre/Form:

554714
Electronic books.

Using 210Po/210Pb Disequilibria to Characterize the Biogeochemistry and Quantify the Dynamics of Sea Ice in the Arctic.
LDR:02532ntm a2200325K 4500 001 913317
005 20180618102617.5
006 m o u
007 cr mn||||a|a||
008 190606s2017 xx obm 000 0 eng d
020 $a 9780355242805
035 $a (MiAaPQ)AAI10614966
035 $a (MiAaPQ)wayne:13416
035 $a AAI10614966
040 $a MiAaPQ $b eng $c MiAaPQ
100 1 $a Krupp, Katherine. $3 1186104
245 1 0 $a Using 210Po/210Pb Disequilibria to Characterize the Biogeochemistry and Quantify the Dynamics of Sea Ice in the Arctic.
264 0 $c 2017
300 $a 1 online resource (90 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 57-01.
500 $a Adviser: Mark M. Baskaran.
502 $a Thesis (M.S.)--Wayne State University, 2017.
504 $a Includes bibliographical references
520 $a Understanding the biogeochemical cycles of the Arctic Ocean is highly significant due to its many unique characteristics which impact the cycling of important trace elements, isotopes, and nutrients. Furthermore, with its seasonally-changing sea ice extent and substantial role in the global radiation balance, the Arctic is considered a sensitive indicator of global change. The study of 210Po and 210Pb disequilibria is used to determine 1) the residence time of ice-rafted sediments in sea ice, 2) ice floe dynamics such as ice accumulation rates, and 3) biogeochemical characterization of the Arctic due to the natural occurrence and particle reactivity of 210Po and 210Pb. The "age" of ice-rafted sediments ranged from 56-136 days, and transport rates of 0.08 to 0.17 m/s were observed, consistent with previous reports, with the higher rates potentially influenced by non-conservative behavior of radionuclides during melt season. The mechanisms of isotopic disequilibria with depth in ice cores is not yet clearly understood, but model-based estimates of ice accumulation range from 0.08 -- 7 cm/d (mean = 1.4 cm/d). Wide-scale 210Po deficiency in water columns of the central and western Arctic (integrated AR's = 0.51+/- 0.07 and 0.56 +/- 0.07 for ST-30 and ST-43, respectively) indicate early summer export of 210Po with biogenic particles.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Geochemistry. $3 648291
650 4 $a Environmental science. $3 1179128
655 7 $a Electronic books. $2 local $3 554714
690 $a 0996
690 $a 0768
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Wayne State University. $b Geology. $3 1186105
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10614966 $z click for full text (PQDT)