231Pa and 230Th in the ocean model of the Community Earth System Model (CESM1.3)
Abstract
The sediment 231Pa/230Th activity ratio is emerging as an important proxy for deep ocean circulation in the past. In order to allow for a direct model–data comparison and to improve our understanding of the sediment 231Pa/230Th activity ratio, we implement 231Pa and 230Th in the ocean component of the Community Earth System Model (CESM). In addition to the fully coupled implementation of the scavenging behavior of 231Pa and 230Th with the active marine ecosystem module (particle-coupled: hereafter p-coupled), another form of 231Pa and 230Th have also been implemented with prescribed particle flux fields of the present climate (particle-fixed: hereafter p-fixed). The comparison of the two forms of 231Pa and 230Th helps to isolate the influence of the particle fluxes from that of ocean circulation. Under present-day climate forcing, our model is able to simulate water column 231Pa and 230Th activity and the sediment 231Pa/230Th activity ratio in good agreement with available observations. In addition, in response to freshwater forcing, the p-coupled and p-fixed sediment 231Pa/230Th activity ratios behave similarly over large areas of low productivity on long timescales, but can differ substantially in some regions of high productivity and on short timescales, indicating the importance of biological productivity in additionmore »
- Authors:
-
[1];
- Univ. of Wisconsin, Madison, WI (United States)
- Ohio State Univ., Columbus, OH (United States)
- Publication Date:
- Research Org.:
- University Corporation for Atmospheric Research, Boulder, CO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1511021
- Grant/Contract Number:
- SC0006744
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geoscientific Model Development (Online)
- Additional Journal Information:
- Journal Name: Geoscientific Model Development (Online); Journal Volume: 10; Journal Issue: 12; Journal ID: ISSN 1991-9603
- Publisher:
- European Geosciences Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Gu, Sifan, and Liu, Zhengyu. 231Pa and 230Th in the ocean model of the Community Earth System Model (CESM1.3). United States: N. p., 2017.
Web. doi:10.5194/gmd-10-4723-2017.
Gu, Sifan, & Liu, Zhengyu. 231Pa and 230Th in the ocean model of the Community Earth System Model (CESM1.3). United States. https://doi.org/10.5194/gmd-10-4723-2017
Gu, Sifan, and Liu, Zhengyu. Fri .
"231Pa and 230Th in the ocean model of the Community Earth System Model (CESM1.3)". United States. https://doi.org/10.5194/gmd-10-4723-2017. https://www.osti.gov/servlets/purl/1511021.
@article{osti_1511021,
title = {231Pa and 230Th in the ocean model of the Community Earth System Model (CESM1.3)},
author = {Gu, Sifan and Liu, Zhengyu},
abstractNote = {The sediment 231Pa/230Th activity ratio is emerging as an important proxy for deep ocean circulation in the past. In order to allow for a direct model–data comparison and to improve our understanding of the sediment 231Pa/230Th activity ratio, we implement 231Pa and 230Th in the ocean component of the Community Earth System Model (CESM). In addition to the fully coupled implementation of the scavenging behavior of 231Pa and 230Th with the active marine ecosystem module (particle-coupled: hereafter p-coupled), another form of 231Pa and 230Th have also been implemented with prescribed particle flux fields of the present climate (particle-fixed: hereafter p-fixed). The comparison of the two forms of 231Pa and 230Th helps to isolate the influence of the particle fluxes from that of ocean circulation. Under present-day climate forcing, our model is able to simulate water column 231Pa and 230Th activity and the sediment 231Pa/230Th activity ratio in good agreement with available observations. In addition, in response to freshwater forcing, the p-coupled and p-fixed sediment 231Pa/230Th activity ratios behave similarly over large areas of low productivity on long timescales, but can differ substantially in some regions of high productivity and on short timescales, indicating the importance of biological productivity in addition to ocean transport. Thus, our model provides a potentially powerful tool to help the interpretation of sediment 231Pa/230Th reconstructions and to improve our understanding of past ocean circulation and climate changes.},
doi = {10.5194/gmd-10-4723-2017},
journal = {Geoscientific Model Development (Online)},
number = 12,
volume = 10,
place = {United States},
year = {Fri Dec 22 00:00:00 EST 2017},
month = {Fri Dec 22 00:00:00 EST 2017}
}
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Works referencing / citing this record:
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- Geo-Marine Letters, Vol. 40, Issue 1
A global scavenging and circulation ocean model of thorium-230 and protactinium-231 with improved particle dynamics (NEMO–ProThorP 0.1)
journal, January 2018
- van Hulten, Marco; Dutay, Jean-Claude; Roy-Barman, Matthieu
- Geoscientific Model Development, Vol. 11, Issue 9