= Intermediate conclusions =
[[PageOutline]]

== Pre industrial run ==
 - 39 layers,
 - from fictives years 1970 to 2015
 - 

* Total N,,2,,O loss: 10.73 TgN/y
* Total N,,2,,O emissions: 10.73 TgN/y
* Burden : 1368 TgN



== CEDS emissions for N,,2,,O (and NH,,3,,) ==
[[Image(wiki:ESM2025-N-cycle:N2O_CEDS_supplementary_avion.png, 700px)]]
[[Image(wiki:ESM2025-N-cycle:NH3_CEDS_supplementary.png, 700px)]]

== Exploration of inventories ==
* //Bouwman Inventory// :
  1. 846 N,,2,,O 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; NH,,4,,+ application rate (for organic fertilizers), N,,2,,O/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 N,,2,,O-N y-1. The tropics (± 30° of the equator) contribute 5.4 Tg N,,2,,O-N y-1 and the emission from extra-tropical regions (poleward of 30°) is 1.4 Tg N,,2,,O-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 N,,2,,O emissions per inventory :

||  (MtN/yr) ||   Ocean  ||   Land   || Total ||  (MtN,,2,,O/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.