wiki:ESM2025-N-cycle/Intermediate_conclusions

Version 8 (modified by klaurent, 17 months ago) (diff)

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Intermediate conclusions

Pre industrial run

Some miscellaneous characteristics:

  • GES configuration,
  • 39 vertical layers, resolution 144x142,
  • from fictives years 1970 to 2015,
  • no anthropogenic emissions,
  • BBG emissions stayed at 1850 (as well as aircraft).

Quantities to remember:

  • Total N2O loss: 10.73 TgN/y
  • Total N2O emissions: 10.73 TgN/y
  • Burden : 1368 TgN

CEDS emissions for N2O (and NH3)

List of categories and subcategories:

  • Agriculture: ['3B_Manure-management', '3D_Soil-emissions']
  • Energy: ['1A1a_Electricity-autoproducer', '1A1a_Electricity-public', '1A1a_Heat-production', '1A1bc_Other-transformation','1B1_Fugitive-solid-fuels', '1B2_Fugitive-petr', '7A_Fossil-fuel-fires']
  • Industrial: ['1A2a_Ind-Comb-Iron-steel', '1A2b_Ind-Comb-Non-ferrous-metals', '1A2c_Ind-Comb-Chemicals', '1A2d_Ind-Comb-Pulp-paper', '1A2e_Ind-Comb-Food-tobacco', '1A2f_Ind-Comb-Non-metalic-minerals', '1A2g_Ind-Comb-Construction', '1A2g_Ind-Comb-machinery','1A2g_Ind-Comb-mining-quarying', '1A2g_Ind-Comb-other','1A2g_Ind-Comb-textile-leather', '1A2g_Ind-Comb-transpequip','1A2g_Ind-Comb-wood-products','1A5_Other-unspecified', '2A1_Cement-production', '2B_Chemical-industry', '7BC_Indirect-N2O-non-agricultural-N', '2B2_Chemicals-Nitric-acid', '2B3_Chemicals-Adipic-acid']
  • Transportation: ['1A3b_Road', '1A3c_Rail','1A3dii_Domestic-navigation', '1A3eii_Other-transp']
  • Residential, Commercial, Other: ['1A4a_Commercial-institutional', '1A4b_Residential', '1A4c_Agriculture-forestry-fishing']
  • Solvents production and application: [ '2D_Other-product-use' ]
  • Waste: ['5C_Waste-combustion', '5D_Wastewater-handling', '5E_Other-waste-handling']
  • Int. Aviation / Shipping ['1A3di_International-shipping', '1A3ai_International-aviation', '1A3aii_Domestic-aviation']

NB: It exists also some other subcategories but, there are zero N2O emission.

EDGAR emissions

List of categories and subcategories:

  • AFOLU : ['Biomass burning (CH4, N2O)', 'Managed soils and pasture (CO2, N2O)', 'Manure management (N2O, CH4)', 'Synthetic fertilizer application (N2O)']
  • Buildings : ['Residential', 'Non-residential']
  • Energy systems : ['Electricity & heat', 'Other (energy systems)', 'Oil and gas fugitive emissions', 'Petroleum refining']
  • Industry : ['Chemicals', 'Other (industry)', 'Waste', 'Metals']
  • Transport : ['Domestic Aviation', 'Other (transport)', 'Road', 'Inland Shipping', 'International Aviation', 'Rail ', 'International Shipping']

Exploration of inventories

  • Bouwman Inventory :
    1. 846 N2O emission measurements in agricultural fields and 99 measurements for NO emissions
    2. The data set includes literature reference; location of the Measurement; climate; soil type, texture, organic C content, N content, drainage, and pH; residues left in the field; crop; fertilizer type; N application rate; method and timing of fertilizer application; NH4+ application rate (for organic fertilizers), N2O/NO emission/denitrification (expressed as total over the measurement period, as % of N rate, and as % of N rate accounting for control); measurement technique; length of measurement period; frequency of the measurements; and additional information, such as year/season of measurement, information on soil, crop or fertilizer management, specific characteristics of the fertilizer used, and specific weather events important for explaining the measured emissions.
    3. global gridded (1°x1° resolution) data bases of soil type, soil texture, NDVI (vegetation indices) and climate.
    4. global emission thus calculated is 6.8 Tg N2O-N y-1. The tropics (± 30° of the equator) contribute 5.4 Tg N2O-N y-1 and the emission from extra-tropical regions (poleward of 30°) is 1.4 Tg N2O-N y-1 .
  • Transcom Inventory :
    1. "Emissions from natural soils (6–7 TgN yr −1 ) account for 60–70 % of global N2O emissions (Syakila and Kroeze, 2011; Zaehle et al., 2011). The remaining 30–40 % of emissions is from oceans (4.5 TgN yr −1 )"
    2. Five different inversion frameworks (chemistry transport model) : MOZART4 (2.5° × 1.88°), ACMt42167 (2.8° × 2.8°), TM3 (5.0° × 3.75°), TM5 (6.0° × 4.0°), LMDZ4 (3.75° × 2.5°).
    3. Data set from Orchidee O-CN, Pisces, edgar-4.1, gfed-2 and from different category (terrestrial biosphere, ocean, waste water, solid waste, solvents, fuel prod, ground transport, industry combustion, residential and other combustion, shipping, biomass burning)
  • Values of N2O emissions per inventory :
(MtN/yr) Ocean Land Total (MtN2O/yr) Ocean Land Total
Bouwman 3.595 7.531 11.126 xxx 5.650 11.835 17.485
Transcom 4.222 10.573 14.795 xxx 6.634 16.614 23.248
Piscidee 3.962 7.107 11.069 xxx 6.226 11.168 17.394
  • Comparison between Incasflx outputs and masks on NetCDF files:
- Output INCASFLX - - Notebook computing (FracMask?) - - Notebook computing (0/1 Mask) -
(MtN2O/yr) Ocean Land Ratio O/L Ocean Land Ratio O/L Ocean Land Ratio O/L
Bouwman 5.6505 11.835 0.478 6.58 10.945 0.6012 5.973 11.552 0.517
32.3% 67.7% 37.6% 62.4% 34.1% 65.9%
Transcom 6.634 16.614 0.399 8.879 14.421 0.616 8.118 15.184 0.535
28.5% 71.5% 38.1% 61.9% 34.8% 65.2%
Piscidee 6.226 11.168 0.557 6.651 10.782 0.617 6.095 11.339 0.538
35.8% 64.2% 38.2% 61.8% 34.9% 65.1%

General remarks: Variable for Bouwman = fn2o_oce & fn2o_soil. Land emissions > Ocean emissions. Ocean emissions ~ 6 Mt/yr. Land emissions -> differences because of different period (pre-industrial & nowadays). Per line, Ocean+Land are equal independently of the calculation made.

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