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

Journal Article · · Journal of Advances in Modeling Earth Systems
DOI:https://doi.org/10.1029/2019MS001663· OSTI ID:1567945
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. Climate and Global Dynamics Laboratory National Center for Atmospheric Research Boulder CO USA
  2. Bren School of Environmental Science &, Management University of California Santa Barbara CA USA
  3. Department of Geography The Ohio State University Columbus OH USA
  4. College of Earth, Ocean, &, Atmospheric Sciences Oregon State University Corvallis OR USA
  5. NASA Goddard Institute for Space Studies and Center for Climate Systems Research Columbia University New York NY USA
  6. Department of Geosciences University of Connecticut Storrs CT USA
  7. Department of Computer Science University of Colorado Boulder Boulder CO USA
  8. Center for Nonlinear Studies Los Alamos National Laboratory Los Alamos NM USA
  9. Department of Earth and Environmental Sciences University of Michigan Ann Arbor MI USA

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 δD 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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC). Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1567945
Alternate ID(s):
OSTI ID: 1566119; OSTI ID: 1567950
Report Number(s):
LA-UR-19-28472
Journal Information:
Journal of Advances in Modeling Earth Systems, Journal Name: Journal of Advances in Modeling Earth Systems Vol. 11 Journal Issue: 8; ISSN 1942-2466
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 95 works
Citation information provided by
Web of Science

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Figures / Tables (12)