Importance of Human-Induced Nitrogen Flux Increases for Simulated Arctic Warming

Human activities such as fossil fuel combustion, land-use change, nitrogen (N) fertilizer use, emission of livestock, and waste excretion accelerate the transformation of reactive N and its impact on the marine environment. This study elucidates that anthropogenic N fluxes (ANFs) from atmospheric an...

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Bibliographic Details
Published in:Journal of Climate
Main Authors: Lim, Hyung-Gyu, Park, Jong-Yeon, Dunne, John P., Stock, Charles A., Kang, Sung-Ho, Kug, Jong-Seong
Format: Article in Journal/Newspaper
Language:English
Published: AMER METEOROLOGICAL SOC 2021
Subjects:
SEA-ICE LOSS
FUTURE CLIMATE-CHANGE
BASE-LINE
PART I
ANTHROPOGENIC NITROGEN
DYNAMICAL CORE
OCEAN
CARBON
MODEL
PHYTOPLANKTON
Arctic
Climate change
Ocean models
Arctic Ocean
laptev
Phytoplankton
Sea ice
Online Access:https://oasis.postech.ac.kr/handle/2014.oak/106844
https://doi.org/10.1175/JCLI-D-20-0180.1
Description
Summary:Human activities such as fossil fuel combustion, land-use change, nitrogen (N) fertilizer use, emission of livestock, and waste excretion accelerate the transformation of reactive N and its impact on the marine environment. This study elucidates that anthropogenic N fluxes (ANFs) from atmospheric and river deposition exacerbate Arctic warming and sea ice loss via physical-biological feedback. The impact of physical-biological feedback is quantified through a suite of experiments using a coupled climate-ocean-biogeochemical model (GFDL-CM2.1-TOPAZ) by prescribing the preindustrial and contemporary amounts of riverine and atmospheric N fluxes into the Arctic Ocean. The experiment forced by ANFs represents the increase in ocean N inventory and chlorophyll concentrations in present and projected future Arctic Ocean relative to the experiment forced by preindustrial N flux inputs. The enhanced chlorophyll concentrations by ANFs reinforce shortwave attenuation in the upper ocean, generating additional warming in the Arctic Ocean. The strongest responses are simulated in the Eurasian shelf seas (Kara, Barents, and Laptev Seas; 65 degrees-90 degrees N, 20 degrees-160 degrees E) due to increased N fluxes, where the annual mean surface temperature increase by 12% and the annual mean sea ice concentration decrease by 17% relative to the future projection, forced by preindustrial N inputs. 1 1 N scie scopus

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