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- Title
Implementing soil erosion process into the land surface model ORCHIDEE.
- Authors
Zhang, Haicheng; Lauerwald, Ronny; Regnier, Pierre; Ciais, Philippe; Guenet, Bertrand; Naipal, Victoria; Van Oost, Kristof
- Abstract
Erosion and transport of sediments and soil organic carbon (SOC) by running water play animportant role in global biogeochemical cycles. Nevertheless, these processes are stillignored in land surface models which are used to project the future land-atmosphere C fluxesin response to anthropogenic CO2 emissions, climate and land use change. By implementingthe soil erosion model MUSLE (the Modified Universal Soil Loss Equation) intothe land surface scheme ORCHIDEE (the ORganizing Carbon and Hydrology inDynamic Ecosystems), we developed the new model ORCHIDEE-MUSLE thatsimulates the erosion-induced loss of sediment and SOC from land to inland waters,as well as the impacts of soil erosion on vertical SOC profiles at daily time step.Evaluation of ORCHIDEE-MUSLE for the Rhine Watershed in Europe shows that ourmodel reasonably reproduces the magnitude and spatial pattern of soil erosion rates,as well as the seasonal patterns of sediment discharge rates at different locationsof the Rhine Watershed. From 1901 to 2014, the average sediment loss rate fromslope-land to river networks in Rhine Watershed is about 53.02 (±21.90) g m−2yr−1, and the SOC loss rate is 0.42 (±0.19) g C m−2 yr−1. Soil erosion duringthe whole simulated 114 year has averagely induced a reduction of 0.45% of thetotal SOC stock in the top 2 m soil layer of the Rhine Watershed. We concludethat the coupling of MUSLE and ORCHIDEE should be a feasible and reliableway to implement soil erosion and deposition processes into land surface model.
- Subjects
EUROPE; SOIL erosion; HYDROLOGY; UNIVERSAL soil loss equation; SEDIMENT transport; BIOGEOCHEMICAL cycles
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article