Details:

Journal Title:
Journal of Advances in Modeling Earth Systems
Personal Author:
Nevison, Cynthia ; Hess, Peter ; Riddick, Stuart ; Ward, Dan
Nevison, Cynthia ; Hess, Peter ; Riddick, Stuart ; Ward, Dan Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory)
OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) Less -
Description:
River nitrogen export is simulated within the Community Earth System Model (CESM) by coupling nitrogen leaching and runoff fluxes from the Community Land Model (CLM) to the River Transport Model (RTM). The coupled CLM-RTM prognostically simulates the downstream impact of human N cycle perturbation on coastal areas. It also provides a framework for estimating denitrification fluxes of N2 and associated trace gases like N2O in soils and river sediments. An important limitation of the current model is that it only simulates dissolved inorganic nitrogen (DIN) river export, due to the lack of dissolved organic nitrogen (DON) and particulate nitrogen (PN) leaching fluxes in CLM. In addition, the partitioning of soil N loss in CLM between the primary loss pathways of denitrification and N leaching/runoff appears heavily skewed toward denitrification compared to other literature estimates, especially in nonagricultural regions, and also varies considerably among the four model configurations presented here. River N export is generally well predicted in the model configurations that include midlatitude crops, but tends to be underpredicted in rivers that are less perturbed by human agriculture. This is especially true in the tropics, where CLM likely underestimates leaching and runoff of all forms of nitrogen. River export of DIN is overpredicted in some relatively unperturbed Arctic rivers, which may result from excessive N inputs to those regions in CLM. Better representation of N loss in CLM can improve confidence in model results with respect to the core model objective of simulating nitrogen limitation of the carbon cycle.
Keywords:
[+]
Community Land Model Earth System Model Nitrogen Cycle Rivers
Source:
J. Adv. Model. Earth Syst., 8, 272– 291
DOI:
https://doi.org/10.1002/2015MS000573
Document Type:
Journal Article
Rights Information:
CC BY
Compliance:
Submitted
Main Document Checksum:
[+]
urn:sha256:493c6ef8865ae61b2ac1a48ee6798d9ad94d3ebb33a60d40396d0a0e546e34c9
Download URL:
https://repository.library.noaa.gov/view/noaa/29879/noaa_29879_DS1.pdf
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