Development of a Microbial Module, CLM-Microbe in CESM: framework and preliminary results
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1 Development of a Microbial Module, CLM-Microbe in CESM: framework and preliminary results Xiaofeng Xu 1, Peter Thornton 1, Fengming Yuan 1, David Graham 2, Dwayne A. Elias 1,2, Santonu Goswami 1, Joshua Schimel 3, Wilfred W. Post 1, Tommy J. Phelps 2, Xia Song 1, Sue L. Carroll 2 (1. Climate Change Science Institute and Environmental Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; 2 Bioscience Division, ORNL; 3. University of California, Santa Barbara Santa Barbara, CA 93106, USA) xux4@ornl.gov, thorntonpe@ornl.gov
2 Motivation Science, 2008 Bardgett et al., 2008
3 This report is based on a colloquium convened by the American Academy of Microbiology, February 21-23, 2011, in Dallas, TX
4 How to incorporate microbial processes and which mechanisms?
5 Microbial Mechanisms Contributing to the Climate System Trace Gases Nutrient Regulation Background map is the carbon density in global soil microbial biomass Xu et al., 2013 Global Ecology and Biogeography
6 CLM-Microbe: Key components Microbial biomass Trace gas model Microbial regulation of nutrient (primarily N at current stage)
7 Microbial Assimilation of Soil Organic Carbon: Microbial biomass
8 Microbial biomass CWD Ʈ=2.7 Litter 1 Ʈ= MB 0.39 Litter 2 Ʈ=0.038 MB 0.39 Litter 3 Ʈ=0.19 MB 0.39 CWD Ʈ=2.7 Soil 1 Ʈ=0.038 Litter 1 Ʈ= MB Soil 2 Ʈ=0.19 MB Litter 2 Ʈ= Soil 3 Ʈ=2.0 Litter 3 Ʈ= Soil 4 Ʈ=27 Thornton & Rosenbloom, 2005 Koven et al., 2013 Soil 1 Ʈ= Soil 2 Ʈ= Soil 3 Ʈ= Soil 4 Ʈ= MB 0.55 MB 1.0
9 Microbial processes in assimilating carbon from substrate Xu et al., To be submitted
10 Microbial active period is a new term, which is similar as vegetation growing season; it integrates information of environmental factors and microbial physiology. Xu et al., To be submitted
11 CESM/ CLM C:N range MAP range Daily soil temperature and moisture Latin Hypercube Sampling 200 pairs of MAP & C:N Biome-level simulations Biome-level microbial assimilation of soil organic carbon Xu et al., To be submitted
12 Biome-level Cmic/Csub Biome Modeled C mic /C org Cmic/Corg (%) (Xu et al., 2013) Boreal forest Temperate coniferous forest Temperate broadleaf forest Tropical/subtro pical forest Grassland Shrub Tundra Desert Natural wetlands Xu et al., To be submitted
13 Xu et al., 2013 CLM-Microbe simulated Xu et al., 2013 CLM-Microbe simulated
14 Trace Gas Module in CESM/CLM
15 CO 2, CH 4, H 2, N 2, NO, N 2 O CH 4, H 2, CO 2 O 2 O N 2 2, NO, N 2 O, NH NH 3 CH 4, H 2 CO 2, CH 4, H 2 N 2, N 2 O, NO, NH 3 O 2 Methanotrophy CO 2 H 2 SOM NH4 + NO, N 2 O NO 2 - N 2 N 2 O NO NH 4 + CH 4 Methanogen Acetate DOC DON NO 3 - NO 2 - leaching. SOM: soil organic matter; DOC: dissolved organic carbon; DON: dissolved organic nitrogen; Methanogen: a group of bacteria producing methane; Methanotrophs: a group of bacteria oxidizing methane; Nitrifier: a group of bacteria carrying out nitrification; Denitrifier: a group of bacteria carrying out denitrification
16 Methane module conceptural structure Xu et al., To be submitted
17 Comparison between measured and modeled (A) CO 2 and (B) CH 4 concentrations Xu et al., To be submitted
18 CLM-Microbe Simulation Dissolved Organic Carbon Biomass of Aerobic Methanotrophys O2 concentration in soil column
19 Microbial Regulation of Nitrogen Cycling in Soils
20 Manzoni et al., 2008
21 CO 2 CO 2 CUE=0.4 Microbe C:N = 8 CUE=0.3 Microbe C:N = 8 40C : 1N 1N 40C : 1N 0.5N Organic Matter Mineral N Organic Matter Mineral N Fixed microbial regulation on N immobilization Dynamic microbial regulation on N immobilization
22
23 Mineral N (Dynamics microbial CUE fix microbial CUE) More mineral N in soils NPP (Dynamics microbial CUE fix microbial CUE) Better vegetation growth
24 Summary Microbial mechanisms for trace gas fluxes and nutrient cycling in soils are critically important. CLM-Microbe is able to simulate soil microbial biomass dynamics, trace gas fluxes, and microbial regulation of nitrogen cycling in soils.
25 AGU session in December 2013 B019. Data-Model Integration for Improving Biogeochemistry- Climate Feedbacks in Earth System Models with Explicit Microbial Mechanisms Organized by Xiaofeng Xu, Peter E. Thornton, Santonu Goswami, Yiqi Luo One of Global Soils SWIRL in AGU Biogeoscience section Calls for Abstracts
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