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Title: Predicted Land Carbon Dynamics Are Strongly Dependent on the Numerical Coupling of Nitrogen Mobilizing and Immobilizing Processes: A Demonstration with the E3SM Land Model

Journal Article · · Earth Interactions
ORCiD logo [1];  [1]
  1. Earth and Environmental Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, California

Coupling carbon and nitrogen processes is critical for Earth system models to accurately predict future climate and land biogeochemistry feedbacks. However, it has not yet been analyzed how numerical methods that land biogeochemical models apply to couple soil mineral nitrogen mobilizing and immobilizing processes affect predicted ecosystem carbon and nitrogen cycling. These effects were investigated here by using the E3SM land model and an evaluation of three plausible and widely used numerical couplings: (1) the mineral nitrogen-based limitation scheme, (2) the net uptake–based limitation scheme, and (3) the proportional nitrogen flux–based limitation scheme. It was found that these three schemes resulted in large differences (with a range of 316 PgC) in predicted cumulative land–atmosphere carbon exchanges under the RCP4.5 atmospheric CO2 simulations. This large uncertainty is without accounting for the different representations of the many land biogeochemical processes, but is about 73% of the range (434 PgC) reported for CMIP5 RCP4.5 simulations. Furthermore, these results help explain the large uncertainty found in various model intercomparison experiments and suggest that more robust numerical implementations are needed to improve carbon–nutrient cycle coupling in terrestrial ecosystem models.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1438962
Alternate ID(s):
OSTI ID: 1477292
Journal Information:
Earth Interactions, Journal Name: Earth Interactions Vol. 22 Journal Issue: 11; ISSN 1087-3562
Publisher:
American Meteorological SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (6)