語系:
繁體中文
English
說明(常見問題)
回圖書館首頁
手機版館藏查詢
登入
回首頁
切換:
標籤
|
MARC模式
|
ISBD
FindBook
Google Book
Amazon
博客來
Marine DOC Modeling Suggests the Importance of Hydrothermal Vents and Initial DOC Production.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Marine DOC Modeling Suggests the Importance of Hydrothermal Vents and Initial DOC Production./
作者:
Zahn, Jacob.
出版者:
Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:
56 p.
附註:
Source: Masters Abstracts International, Volume: 83-03.
Contained By:
Masters Abstracts International83-03.
標題:
Ocean engineering. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28546832
ISBN:
9798538126569
Marine DOC Modeling Suggests the Importance of Hydrothermal Vents and Initial DOC Production.
Zahn, Jacob.
Marine DOC Modeling Suggests the Importance of Hydrothermal Vents and Initial DOC Production.
- Ann Arbor : ProQuest Dissertations & Theses, 2021 - 56 p.
Source: Masters Abstracts International, Volume: 83-03.
Thesis (M.S.)--University of Minnesota, 2021.
This item must not be sold to any third party vendors.
Marine DOC represents the largest ocean reservoir of reduced carbon, holding > 200 times the carbon inventory of marine biomass, or an amount of carbon roughly equal to that in the atmosphere. Therefore, the DOC reservoir is significant in terms of long-term climate change. The largest fraction of DOC is characterized as refractory (DOCR) and radiocarbon ages indicate that this fraction survives multiple deep ocean mixing cycles. While DOCR production is understood to be tied mainly to primary production in the surface ocean, the mechanisms for DOCR removal are less well-understood, which has caused difficulty in quantifying the dynamics of this reservoir. However, photodegradation and hydrothermal vent degradation have been identified as likely mechanisms. In this study, DOC dynamics were incorporated into a well-calibrated dynamic ocean model, which explicitly represents important DOC processes: DOC production through primary production and degradation via photodegradation, hydrothermal vent degradation, and slow background degradation. A model simulation using literature values for key model parameters (Literature Value Run) resulted in large discrepancies from observation in both DOC concentration and the gradient in DOC concentration along the path of deep ocean circulation. These discrepancies suggest that the current state of knowledge of the underlying processes related to these observations is inadequate. After tuning model parameters, most notably DOCR production and the flux of seawater through hydrothermal vents, a Tuned Run was achieved. From this run, sensitivity tests were performed to examine how dependent model results were to changes in key model parameters. Between the Literature Value Run, the Tuned Run, and the sensitivity tests, three conclusions were drawn: (1) it is likely that the current literature value for the fraction of NPP that becomes DOCR is too large, by approximately five times, (2) the literature value for hydrothermal vent flux is likely too small and may be five times the current value, and (3) hydrothermal vents are a likely source of radiocarbon-depleted DOC to the deep ocean.
ISBN: 9798538126569Subjects--Topical Terms:
660731
Ocean engineering.
Subjects--Index Terms:
Marine DOC modeling
Marine DOC Modeling Suggests the Importance of Hydrothermal Vents and Initial DOC Production.
LDR
:03288nmm a2200361 4500
001
2346224
005
20220620110449.5
008
241004s2021 ||||||||||||||||| ||eng d
020
$a
9798538126569
035
$a
(MiAaPQ)AAI28546832
035
$a
AAI28546832
040
$a
MiAaPQ
$c
MiAaPQ
100
1
$a
Zahn, Jacob.
$3
3685288
245
1 0
$a
Marine DOC Modeling Suggests the Importance of Hydrothermal Vents and Initial DOC Production.
260
1
$a
Ann Arbor :
$b
ProQuest Dissertations & Theses,
$c
2021
300
$a
56 p.
500
$a
Source: Masters Abstracts International, Volume: 83-03.
500
$a
Advisor: Matsumoto, Katsumi.
502
$a
Thesis (M.S.)--University of Minnesota, 2021.
506
$a
This item must not be sold to any third party vendors.
520
$a
Marine DOC represents the largest ocean reservoir of reduced carbon, holding > 200 times the carbon inventory of marine biomass, or an amount of carbon roughly equal to that in the atmosphere. Therefore, the DOC reservoir is significant in terms of long-term climate change. The largest fraction of DOC is characterized as refractory (DOCR) and radiocarbon ages indicate that this fraction survives multiple deep ocean mixing cycles. While DOCR production is understood to be tied mainly to primary production in the surface ocean, the mechanisms for DOCR removal are less well-understood, which has caused difficulty in quantifying the dynamics of this reservoir. However, photodegradation and hydrothermal vent degradation have been identified as likely mechanisms. In this study, DOC dynamics were incorporated into a well-calibrated dynamic ocean model, which explicitly represents important DOC processes: DOC production through primary production and degradation via photodegradation, hydrothermal vent degradation, and slow background degradation. A model simulation using literature values for key model parameters (Literature Value Run) resulted in large discrepancies from observation in both DOC concentration and the gradient in DOC concentration along the path of deep ocean circulation. These discrepancies suggest that the current state of knowledge of the underlying processes related to these observations is inadequate. After tuning model parameters, most notably DOCR production and the flux of seawater through hydrothermal vents, a Tuned Run was achieved. From this run, sensitivity tests were performed to examine how dependent model results were to changes in key model parameters. Between the Literature Value Run, the Tuned Run, and the sensitivity tests, three conclusions were drawn: (1) it is likely that the current literature value for the fraction of NPP that becomes DOCR is too large, by approximately five times, (2) the literature value for hydrothermal vent flux is likely too small and may be five times the current value, and (3) hydrothermal vents are a likely source of radiocarbon-depleted DOC to the deep ocean.
590
$a
School code: 0130.
650
4
$a
Ocean engineering.
$3
660731
650
4
$a
Biogeochemistry.
$3
545717
650
4
$a
Chemical oceanography.
$3
516760
653
$a
Marine DOC modeling
653
$a
Hydrothermal vents
653
$a
Dissolved Organic Carbon
653
$a
Ocean reservoir
690
$a
0547
690
$a
0425
690
$a
0403
710
2
$a
University of Minnesota.
$b
Earth Sciences.
$3
3346369
773
0
$t
Masters Abstracts International
$g
83-03.
790
$a
0130
791
$a
M.S.
792
$a
2021
793
$a
English
856
4 0
$u
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28546832
筆 0 讀者評論
館藏地:
全部
電子資源
出版年:
卷號:
館藏
1 筆 • 頁數 1 •
1
條碼號
典藏地名稱
館藏流通類別
資料類型
索書號
使用類型
借閱狀態
預約狀態
備註欄
附件
W9468662
電子資源
11.線上閱覽_V
電子書
EB
一般使用(Normal)
在架
0
1 筆 • 頁數 1 •
1
多媒體
評論
新增評論
分享你的心得
Export
取書館
處理中
...
變更密碼
登入