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Title: The Connected Isotopic Water Cycle in the Community Earth System Model Version 1

Abstract

Because of the pervasive role of water in the Earth system, the relative abundances of stable isotopologues of water are valuable for understanding atmospheric, oceanic, and biospheric processes, and for interpreting paleoclimate proxy reconstructions. Isotopologues are transported by both large-scale and turbulent flows, and the ratio of heavy to light isotopologues changes due to fractionation that can accompany condensation and evaporation processes. Correctly predicting the isotopic distributions requires resolving the relationships between large-scale ocean and atmospheric circulation and smaller-scale hydrological processes, which can be accomplished within a coupled climate modeling framework. Here we present the water isotope-enabled version of the Community Earth System Model version 1 (iCESM1), which simulates global variations in water isotopic ratios in the atmosphere, land, ocean, and sea ice. In a transient Last Millennium simulation covering the 850–2005 period, iCESM1 correctly captures the late-twentieth-century structure of $$δ^{18}$$O and $δ$D over the global oceans, with more limited accuracy over land. The relationship between salinity and seawater $$δ^{18}$$O is also well represented over the observational period, including interbasin variations. We illustrate the utility of coupled, isotope-enabled simulations using both Last Millennium simulations and freshwater hosing experiments with iCESM1. Closing the isotopic mass balance between all components of the coupled model provides new confidence in the underlying depiction of the water cycle in CESM, while also highlighting areas where the underlying hydrologic balance can be improved. The iCESM1 is poised to be a vital community resource for ongoing model development with both modern and paleoclimate applications.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [1]; ORCiD logo [6];  [1]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [9]
  1. National Center for Atmospheric Research, Boulder, CO (United States). Climate and Global Dynamics Lab.
  2. Univ. of California, Santa Barbara, CA (United States). Bren School of Environmental Science & Management
  3. The Ohio State Univ., Columbus, OH (United States). Dept. of Geography
  4. Oregon State Univ., Corvallis, OR (United States). College of Earth, Ocean, & Atmospheric Sciences
  5. NASA Goddard Inst. for Space Studies (GISS), New York, NY (United States)
  6. Univ. of Connecticut, Storrs, CT (United States). Dept. of Geosciences
  7. Univ. of Colorado, Boulder, CO (United States). Dept. of Computer Science
  8. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Nonlinear Studies
  9. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Earth and Environmental Sciences
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Biological and Environmental Research (BER) (SC-23); USDOE
OSTI Identifier:
1567945
Alternate Identifier(s):
OSTI ID: 1566119; OSTI ID: 1567950
Report Number(s):
LA-UR-19-28472
Journal ID: ISSN 1942-2466
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Published Article
Journal Name:
Journal of Advances in Modeling Earth Systems
Additional Journal Information:
Journal Volume: 11; Journal Issue: 8; Journal ID: ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Earth Sciences

Citation Formats

Brady, E., Stevenson, S., Bailey, D., Liu, Z., Noone, D., Nusbaumer, J., Otto‐Bliesner, B. L., Tabor, C., Tomas, R., Wong, T., Zhang, J., and Zhu, J. The Connected Isotopic Water Cycle in the Community Earth System Model Version 1. United States: N. p., 2019. Web. doi:10.1029/2019MS001663.
Brady, E., Stevenson, S., Bailey, D., Liu, Z., Noone, D., Nusbaumer, J., Otto‐Bliesner, B. L., Tabor, C., Tomas, R., Wong, T., Zhang, J., & Zhu, J. The Connected Isotopic Water Cycle in the Community Earth System Model Version 1. United States. doi:10.1029/2019MS001663.
Brady, E., Stevenson, S., Bailey, D., Liu, Z., Noone, D., Nusbaumer, J., Otto‐Bliesner, B. L., Tabor, C., Tomas, R., Wong, T., Zhang, J., and Zhu, J. Tue . "The Connected Isotopic Water Cycle in the Community Earth System Model Version 1". United States. doi:10.1029/2019MS001663.
@article{osti_1567945,
title = {The Connected Isotopic Water Cycle in the Community Earth System Model Version 1},
author = {Brady, E. and Stevenson, S. and Bailey, D. and Liu, Z. and Noone, D. and Nusbaumer, J. and Otto‐Bliesner, B. L. and Tabor, C. and Tomas, R. and Wong, T. and Zhang, J. and Zhu, J.},
abstractNote = {Because of the pervasive role of water in the Earth system, the relative abundances of stable isotopologues of water are valuable for understanding atmospheric, oceanic, and biospheric processes, and for interpreting paleoclimate proxy reconstructions. Isotopologues are transported by both large-scale and turbulent flows, and the ratio of heavy to light isotopologues changes due to fractionation that can accompany condensation and evaporation processes. Correctly predicting the isotopic distributions requires resolving the relationships between large-scale ocean and atmospheric circulation and smaller-scale hydrological processes, which can be accomplished within a coupled climate modeling framework. Here we present the water isotope-enabled version of the Community Earth System Model version 1 (iCESM1), which simulates global variations in water isotopic ratios in the atmosphere, land, ocean, and sea ice. In a transient Last Millennium simulation covering the 850–2005 period, iCESM1 correctly captures the late-twentieth-century structure of $δ^{18}$O and $δ$D over the global oceans, with more limited accuracy over land. The relationship between salinity and seawater $δ^{18}$O is also well represented over the observational period, including interbasin variations. We illustrate the utility of coupled, isotope-enabled simulations using both Last Millennium simulations and freshwater hosing experiments with iCESM1. Closing the isotopic mass balance between all components of the coupled model provides new confidence in the underlying depiction of the water cycle in CESM, while also highlighting areas where the underlying hydrologic balance can be improved. The iCESM1 is poised to be a vital community resource for ongoing model development with both modern and paleoclimate applications.},
doi = {10.1029/2019MS001663},
journal = {Journal of Advances in Modeling Earth Systems},
number = 8,
volume = 11,
place = {United States},
year = {2019},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1029/2019MS001663

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