Land Modeling II - Biogeochemistry: Ecosystem Modeling and Land Use Dr. Peter Lawrence Project Scientist Terrestrial Science Section Climate and Global.

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Presentation transcript:

Land Modeling II - Biogeochemistry: Ecosystem Modeling and Land Use Dr. Peter Lawrence Project Scientist Terrestrial Science Section Climate and Global Dynamics Division (With thanks to TSS and IAM groups for their many contributions) Slide 1 - Title

Understanding the Land Surface in the Climate System: Investigations with an Earth System Model (NCAR CESM) The land is a critical interface through which: 1. Climate and climate change impacts humans and ecosystems and 2. Humans and ecosystems can force global environmental and climate change

Understanding the Land Surface in the Climate System: Investigations with an Earth System Model (NCAR CESM) Land Management in CESM: -How will Natural Ecosystems respond to changes in climate and CO 2 ? -How are we transforming Natural Ecosystems through Deforestation, Pasture, Wood Harvesting, or Afforestation? - How will Humanity Feed itself as the population grows, society becomes more affluent, and agriculture is impacted by climate and changing CO 2 ?

Direct solar Absorbed solar Diffuse solar Downwelling longwave Reflected solar Emitted longwave Sensible heat flux Latent heat flux uaua 0 Momentum flux Wind speed Ground heat flux Evaporation Melt Sublimation Throughfall Infiltra- tion Surface runoff Evaporation Transpiration Precipitation Heterotrop. respiration Photosynthesis Autotrophic respiration Litterfall N uptake Vegetation C/N Soil C/N N mineral- ization Fire Surface energy fluxes Hydrology Biogeochemical cycles Aerosol deposition Soil (sand, clay, organic) Sub-surface runoff Aquifer recharge Phenology BVOCs Water table Soil Dust Saturated fraction N dep N fix Denitrification N leaching CH 4 Root litter N2ON2O SCF Surfacewater Bedrock Unconfined aquifer Community Land Model (CLM4.5)

1. CLM Photosynthesis, Respiration and Transpiration Traits, Sunlight, CO 2, Temperature, Water and Nitrogen 2. Carbon Allocation for Leaf, Stem and Root growth from Photosynthesis, Nitrogen availability and Phenology 3. Soil Hydrology, Soil and Litter Carbon and Nitrogen Cycles, and Heterotrophic Respiration (Organic Matter Decay) 4. Land Cover Change, Wood Harvest, Mortality and Fire 5. Crop modeling with Planting, Fertilizer, Irrigation, Grain fill and Harvest Slide 4 – Land Cover Change CLM Vegetation Modeling Leaf to Landscape Processes

Gridcell Glacier Lake Landunit Column PFT Urban Vegetated Soil Community Land Model (CLM 4.5) subgrid tiling structure Crop PFT1PFT2PFT3PFT4 … Unirrig IrrigUnirrig Irrig Crop1 Crop2 Crop2 … L G U T,H,M C1I V PFT4 V PFT3 V PFT1 V PFT2 C1U C2U C2I Roof Sun Wall Shade Wall Pervious Impervious TBD MD HD

Glacier Lake River Routing Runoff River River discharge Urban Land Use Change Wood harvest Disturbance Vegetation Dynamics Growth Competition Wetland CropsIrrigation Flooding Landscape-scale dynamics Long-term dynamical processes that affect fluxes in a changing environment (disturbance, land use, succession) L G U T,H,M C1I V PFT4 V PFT3 V PFT1 V PFT2 C1U C2U C2I Oleson et al. 2013, CLM4.5 Technical Description, 430 pages

Gridcell Glacier Lake Landunit Urban Vegetated Crop Unirrig IrrigUnirrig Irrig Crop1 Crop2 Crop2 … TBD MD HD CLM 4.5 LULCC for Natural PFT and Crop

1. Surface Energy Fluxes: - Solar Energy Fluxes (Albedo – Vegetation, Snow, Soils) - Long Wave Energy Fluxes (Surface Temp & Emissivity) - Latent Heat Fluxes (Transpiration, Evaporation) - Sensible Heat Fluxes (Surface Temp & Roughness) 2. Surface Hydrology: - Rain and Snow (Vegetation, Snow Pack, Runoff) - Transpiration, Evaporation, Snow melt, Sublimation - Soil Hydrology 10 Soil Layers in CLM (Richards Eqns) - Deep Aquifer recharge and drainage (Top Model) 3. Biogeochemistry (Carbon and Nitrogen Cycles): - Plant Photosynthesis and Respiration 6 CO H 2 O + light -> C 6 H 12 O O 2 - Carbohydrates are allocated to Leaves, Roots, Wood - Leaves, roots and wood become litter, debris, soil C - Organic decomposition and fire remove carbon - Nitrogen is cycled impacting growth and decay Slide 4 – Land Cover Change Land Surface in the Climate System

1. Surface Energy Fluxes: - Solar Energy Fluxes (Albedo – Vegetation, Snow, Soils) - Long Wave Energy Fluxes (Surface Temp & Emissivity) - Latent Heat Fluxes (Transpiration, Evaporation) - Sensible Heat Fluxes (Surface Temp & Roughness) 2. Surface Hydrology: - Rain and Snow (Vegetation, Snow Pack, Runoff) - Transpiration, Evaporation, Snow melt, Sublimation - Soil Hydrology 10 Soil Layers in CLM (Richards Eqns) - Deep Aquifer recharge and drainage (Top Model) 3. Biogeochemistry (Carbon and Nitrogen Cycles): - Plant Photosynthesis and Respiration 6 CO H 2 O + light -> C 6 H 12 O O 2 - Carbohydrates are allocated to Leaves, Roots, Wood - Leaves, roots and wood become litter, debris, soil C - Organic decomposition and fire remove carbon - Nitrogen is cycled impacting growth and decay Slide 4 – Land Cover Change Land Surface in the Climate System

1. Surface Energy Fluxes: - Solar Energy Fluxes (Albedo – Vegetation, Snow, Soils) - Long Wave Energy Fluxes (Surface Temp & Emissivity) - Latent Heat Fluxes (Transpiration, Evaporation) - Sensible Heat Fluxes (Surface Temp & Roughness) 2. Surface Hydrology: - Rain and Snow (Vegetation, Snow Pack, Runoff) - Transpiration, Evaporation, Snow melt, Sublimation - Soil Hydrology 10 Soil Layers in CLM (Richards Eqns) - Deep Aquifer recharge and drainage (Top Model) 3. Biogeochemistry (Carbon and Nitrogen Cycles): - Plant Photosynthesis and Respiration 6 CO H 2 O + light -> C 6 H 12 O O 2 - Carbohydrates are allocated to Leaves, Roots, Wood - Leaves, roots and wood become litter, debris, soil C - Organic decomposition and fire remove carbon - Nitrogen is cycled impacting growth and decay Slide 4 – Land Cover Change Land Surface in the Climate System

1.Changes in Atmospheric CO 2 Impacts: - Photosynthesis rates through carbon availability - Transpiration rates through water use efficiency - Vegetation and air temperature - Rain, snow and evaporative demand through climate change with impacts on soil moisture 2.Changes in Aerosols and Nitrogen Impacts: - Direct and diffuse shortwave radiation - Nitrogen available for photosynthesis - Nitrogen available for allocating carbohydrate to plant tissues with feedbacks from canopy growth 3.Land Use and Land Cover Change Impacts: - Deforestation/Afforestation and Wood Harvesting - Agricultural expansion - Urbanization Slide 4 – Land Cover Change CLM allows us to do Ecosystem Modeling in a Changing World

1.Changes in Atmospheric CO 2 Impacts: - Photosynthesis rates through carbon availability - Transpiration rates through water use efficiency - Vegetation and air temperature - Rain, snow and evaporative demand through climate change with impacts on soil moisture 2.Changes in Aerosols and Nitrogen Impacts: - Direct and diffuse shortwave radiation - Nitrogen available for photosynthesis - Nitrogen available for allocating carbohydrate to plant tissues with feedbacks from canopy growth 3.Land Use and Land Cover Change Impacts: - Deforestation/Afforestation and Wood Harvesting - Agricultural expansion - Urbanization Slide 4 – Land Cover Change CLM allows us to do Ecosystem Modeling in a Changing World

1.Changes in Atmospheric CO 2 Impacts: - Photosynthesis rates through carbon availability - Transpiration rates through water use efficiency - Vegetation and air temperature - Rain, snow and evaporative demand through climate change with impacts on soil moisture 2.Changes in Aerosols and Nitrogen Impacts: - Direct and diffuse shortwave radiation - Nitrogen available for photosynthesis - Nitrogen available for allocating carbohydrate to plant tissues with feedbacks from canopy growth 3.Land Use and Land Cover Change Impacts: - Deforestation/Afforestation and Wood Harvesting - Agricultural expansion - Urbanization Slide 4 – Land Cover Change CLM allows us to do Ecosystem Modeling in a Changing World

1.All CMIP5 Earth system models evaluated the impacts on the global carbon cycle from changes in climate, atmospheric CO 2 and aerosols due to Fossil Fuel emissions and Land Cover Change 2. Model simulations were performed for: – 2005 for the Historical period – 2100 Representative Concentration Pathways (RCPs) 3. For each Historical and RCP period land use and land cover change are described through annual changes in four basic land units: - Primary Vegetation (Prior to Human Disturbance) - Secondary Vegetation (Disturbed then abandoned or managed) - Cropping - Pasture (Grazing Lands) 4. Harvesting of biomass is also prescribed for both primary and secondary vegetation land units Ecosystem Modeling in the Coupled Model Intercomparison Project (CMIP5) – CESM modeling for IPCC AR5 Slide 2 - Outline

Ecosystems in CMIP5 Historical and RCP CO 2 and LULCC 1.Changes in Atmospheric CO 2 : - Historical (1850 – 2005): 285 – 379ppm - RCP 4.5 (2006 – 2100): 380 – 538ppm - RCP 8.5 (2006 – 2100): 380 – 936ppm 2.Land Use and Land Cover Change: - Hist: Crop +9.8 ; Tree km 2 - RCP 4.5: Crop -4.2 ; Tree km 2 - RCP 8.5: Crop +2.8 ; Tree km 2

Slide 4 – Land Cover Change Atmospheric CO 2 Ecosystem Changes: NPP – No Land Use Changes in Atmospheric CO 2 and climate impacts on Ecosystem Carbon: - Net Primary Productivity NPP = Photosynthesis – Growth and Maintenance Respiration - Photosynthesis rates change through carbon availability - Transpiration rates change through water use efficiency - Temperature, rain, snow and evaporative demand change through climate with impacts on soil moisture - 1 PgC = gC = 1 GtC

1. Photosynthesis from Farquhar et al. (1980) modified by Harley et al. (1992) and von Caemmerer (2000) 2. Transpiration from Ball and Berry (1991) Slide 4 – Land Cover Change CLM Vegetation Modeling Leaf Level Processes and CO 2

Slide 4 – Land Cover Change Historical Ecosystem Changes: Ecosys C – No Land Use

Ecosystem Modeling in (CLM BGC) – No Land Use

Slide 4 – Land Cover Change Historical Ecosystem Changes: Ecosys C – No Land Use

Slide 4 – Land Cover Change Historical Ecosystem Changes: Ecosys C – No Land Use

CMIP5 Historical and RCP Land Cover Change Slide 3 - Outline CMIP5 Land Cover Change for Historical and RCP Time Series (10 6 km 2 Time SeriesLand Use DescriptionPrimarySecondaryCropPasture Historical Land use and land cover change is from the HYDE 3.0 database RCP 4.5 GCAM Decrease in crops with a similar decrease in pasture. Biofuels included in croplands. Expansion of forested areas for carbon storage RCP 8.5 Message Medium increases in both cropland and pasture. Biofuels included in wood harvest. Large decline in forest area Investigate the impacts of Land Use and Land Cover Change (LULCC) on the Terrestrial Ecosystem Carbon Cycle by comparing CESM Historical and RCP simulations with LULCC against the same simulations with no LULCC

Slide 4 – Land Cover Change Historical Ecosystem Changes: Land Cover Change

Slide 4 – Land Cover Change Historical Ecosystem Changes: Ecosys C – Land Use

Ecosystem Modeling in (CLM BGC) – Land Cover Change

Slide 4 – Land Cover Change Ecosystem Changes in CMIP5 – Land Cover Change Direct LULCC Fluxes: - Conversion Fluxes to the Atmosphere - Conversion Fluxes to Wood Products - Wood Harvest Fluxes to Wood Products - Product Pool Decay to the Atmosphere Indirect LULCC Fluxes: - Loss of potential Ecosystem Sink from Deforestation - Increase in Ecosystem Sink from Afforestation - Changes in Fire with new Land Use - Changes in Soil and Litter Carbon Decay - Changes in nutrient cycling with new Land Use - This is the change in the Ecosystem Sink from LULCC

Slide 4 – Land Cover Change Historical Ecosystem Changes: Direct LULCC Fluxes LULCC DIRECT ECO = Conversion + Wood Harvest = PgC (PgC = ) Conversion = 63.2 PgC Wood Harvest = 63.6 PgC

Slide 4 – Land Cover Change Historical Ecosystem Changes: Direct LULCC Fluxes LULCC DIRECT ECO = Conversion + Wood Harvest = PgC (PgC = ) Conversion = 63.2 PgC Wood Harvest = 63.6 PgC

Slide 4 – Land Cover Change Historical Ecosystem Changes: Land Cover Change LULCC DIRECT ECO = Conversion ATM + Conversion PROD + Wood Harvest = PgC (PgC = ) Conversion = 63.2 PgC Wood Harvest = 63.6 PgC

Slide 4 – Land Cover Change Historical Ecosystem Changes: Indirect LULCC Fluxes LULCC INDIRECT = ∆NPP NOLUC-LU – ∆HR NOLUC-LU – ∆FIRE NOLUC-LU = 3.6 PgC (PgC = ) ∆NPP NOLUC-LU = 71.6 PgC ∆HR NOLUC-LU = 43.1 PgC ∆FIRE NOLUC-LU = 24.9 PgC

Slide 4 – Land Cover Change Historical Ecosystem Changes: Indirect LULCC Fluxes LULCC INDIRECT = ∆NPP NOLUC-LU – ∆HR NOLUC-LU – ∆FIRE NOLUC-LU = 3.6 PgC (PgC = ) ∆NPP NOLUC-LU = 71.6 PgC ∆HR NOLUC-LU = 43.1 PgC ∆FIRE NOLUC-LU = 24.9 PgC

Slide 4 – Land Cover Change Historical Ecosystem Changes: Effective LULCC Flux LULCC EFFECTIVE ECO = LULCC DIRECT ECO + LULCC INDIRECT = PgC (PgC = ) LULCC DIRECT ECO = PgCLULCC INDIRECT = 3.6 PgC

Slide 4 – Land Cover Change RCP 4.5 Ecosystem Changes: Direct LULCC Fluxes LULCC DIRECT ECO = Conversion + Wood Harvest = PgC (PgC = ) Conversion = 9.5 PgC Wood Harvest = PgC

Slide 4 – Land Cover Change RCP 4.5 Ecosystem Changes: Indirect LULCC Fluxes LULCC INDIRECT = ∆NPP NOLUC-LU – ∆HR NOLUC-LU – ∆FIRE NOLUC-LU = PgC (PgC = ) ∆NPP NOLUC-LU = PgC ∆HR NOLUC-LU = 22.2 PgC ∆FIRE NOLUC-LU = -6.7 PgC

Slide 4 – Land Cover Change RCP 4.5 Ecosystem Changes: Indirect LULCC Fluxes LULCC INDIRECT = ∆NPP NOLUC-LU – ∆HR NOLUC-LU – ∆FIRE NOLUC-LU = PgC (PgC = ) ∆NPP NOLUC-LU = PgC ∆HR NOLUC-LU = 22.2 PgC ∆FIRE NOLUC-LU = -6.7 PgC

Slide 4 – Land Cover Change RCP 4.5 Ecosystem Changes: Effective LULCC Fluxes LULCC EFFECTIVE ECO = LULCC DIRECT ECO + LULCC INDIRECT = PgC (PgC = ) LULCC DIRECT ECO = PgCLULCC INDIRECT = PgC

Slide 4 – Land Cover Change RCP 8.5 Ecosystem Changes: Direct LULCC Fluxes LULCC DIRECT ECO = Conversion + Wood Harvest = PgC (PgC = ) Conversion = 33.6 PgC Wood Harvest = PgC

Slide 4 – Land Cover Change RCP 8.5 Ecosystem Changes: Indirect LULCC Fluxes LULCC INDIRECT = ∆NPP NOLUC-LU – ∆HR NOLUC-LU – ∆FIRE NOLUC-LU = -4.5 PgC (PgC = ) ∆NPP NOLUC-LU = 42.3 PgC ∆HR NOLUC-LU = 18.1 PgC ∆FIRE NOLUC-LU = 28.6 PgC

Slide 4 – Land Cover Change RCP 8.5 Ecosystem Changes: Indirect LULCC Fluxes LULCC INDIRECT = ∆NPP NOLUC-LU – ∆HR NOLUC-LU – ∆FIRE NOLUC-LU = -4.5 PgC (PgC = ) ∆NPP NOLUC-LU = 42.3 PgC ∆HR NOLUC-LU = 18.1 PgC ∆FIRE NOLUC-LU = 28.6 PgC

Slide 4 – Land Cover Change RCP 8.5 Ecosystem Changes: Effective LULCC Fluxes LULCC EFFECTIVE ECO = LULCC DIRECT ECO + LULCC INDIRECT = PgC (PgC = ) LULCC DIRECT ECO = PgCLULCC INDIRECT = -4.5 PgC

Slide 4 – Land Cover Change Ecosys CarbonEco Direct LULCC Indirect LULCC Eco Effective LULCC CMIP5 Fossil Fuel Emissions Historical126.8 PgC3.6 PgC130.4 PgC313.8 PgC RCP PgC-49.3 PgC103.3 PgC791.5 PgC RCP PgC-4.5 PgC267.2 PgC PgC *RCP no LULCC simulation have current day wood harvest rates CMIP5 Cumulative LULCC Fluxes – Total Ecosystem Carbon

Slide 4 – Land Cover Change CMIP5 Cumulative LULCC Fluxes – Total Ecosystem Carbon Ecosys Carbon Eco Direct LULCC Indirect LULCC Terrestrial Sink NEE∆ Eco C∆ Prod Historic NoLC PgC-67.3 PgC67.3 PgC- LULCC126.8 PgC3.6 PgC63.6 PgC54.8 PgC-63.2 PgC8.4 PgC RCP4.5 NoLC * 96.7 PgC PgC-66.5 PgC66.0 PgC0.5 PgC LULCC152.6 PgC-49.3 PgC212.0 PgC-65.7 PgC59.4 PgC6.3 PgC RCP8.5 NoLC * PgC PgC PgC119.0 PgC1.2 PgC LULCC271.6 PgC-4.5 PgC223.9 PgC29.1 PgC-47.7 PgC18.6 PgC *RCP no LULCC simulation have current day wood harvest rates

Gridcell Glacier Lake Landunit Urban Vegetated Crop Unirrig IrrigUnirrig Irrig Crop1 Crop2 Crop2 … L G U T,H,M C1I V PFT4 V PFT3 V PFT1 V PFT2 C1U C2U C2I TBD MD HD Land Use Change Planting Leaf emergence Grain fill Harvest Crop Model Irrig / Fertilize CLM 4.5 LULCC for Natural PFT and Crop

Understanding the Land Surface in the Climate System: Investigations with an Earth System Model (NCAR CESM) Land Management in CESM: -How will Natural Ecosystems respond to changes in climate and CO 2 ? -How are we transforming Natural Ecosystems through Deforestation, Pasture, Wood Harvesting, or Afforestation? - How will Humanity Feed itself as the population grows, society becomes more affluent, and agriculture is impacted by climate and changing CO 2 ?