Chapter 8.1 - Recalculations

Last updated on 12 Mar 2018 10:25 (cf. Authors)

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Generally, improvement of the emission inventory is an ongoing task and triggers recalculations for all source categories and pollutants frequently.

Further information regarding recalculations (especially due to changes in methods or activity data)
can be found in the corresponding chapter of the National Inventory Report.

Possible reasons for Recalculations

Due to the ever ongoing efforts to improve the inventory, more or less broad recalculations become necessary with each new submission.

Possible reasons for recalculations are

  1. new (sub-)categories to be included in the inventory or dislocation of subcatagories within the inventory
  2. data (activity data & emission factors) for certain (sub-)categories available for the first time
  3. change of data sources (for activity data)
  4. use of new emission factors (due to: inquest, research projects, expert judgement etc.)
  5. improvement of methods used for calculating emissions
  6. outcome of ongoing review activities under both UN FCCC and UN ECE

etc.

All these changes can effect both several years of the inventory or the entire time series back to 1990 (PM: 1995; BC: 2000), leading to more or less significant changes within the emission trends.

Declaration of Recalculations

Under UN FCCC reporting, parties have to comment any recalculations in any year leading to differences between latest and current submission for a given year or the time period or series. Thereby, highest attention is given to recalculations within base year and the most current year of the latest submission:

Recalculations in Base Year data

  • mostly rather small but of highest importance
  • mostly due to changed methods or emission factors used for entire time series
  • impact on basis of any evaluation

Recalculations in data of current year of the latest submission

  • mostly because of corrected activity data (especially in Energy Production) from actualized Energy Balances
  • also due to changed methods, emission factors, or data sources used
  • impact on the amount of emission reduction reported in latest submission

Recalculations under UN ECE

Within the IIR, Germany focusses on recalculations within 1990 (PM: 1995, BC: 2000) and the most current year of the latest submission, giving a) the quantity (in absolute numbers and in %) of change for any recalculated emission and b) the reasons for the recalculations done.

Recalculations in current submission

Table 1: Overview of impact of recalculations on the level of National Totals
(For more detailed information please mouseclick the pollutant.)

for reporting year: Base Year1 Change 2015 Change
in NFR submission: 2017 2018 absolute relative 2017 2018 absolute relative
Main pollutants
NEC
Nitrogen Oxides - NOx [kt] 2,883.4 2,888.5 5.01 0.17% 1,187.4 1,240.8 53.30 4.49%
Non-Methane VOC - NMVOC [kt] 3,389.7 3,401.6 11.95 0.35% 1,020.2 1,039.2 18.98 1.86%
Sulfur Oxides - SOx [kt] 5,484.9 5,485.8 0.89 0.02% 351.8 364.1 12.34 3.51%
Ammonia - NH3 [kt] 793.1 742.8 -50.32 -6.35% 759.3 670.3 -88.97 -11.72%
Particulate Matter
Particles <2.5µm PM2.5 [kt] 194.8 196.5 1.70 0.87% 99.5 103.2 3.67 3.69%
Particles <10µm - PM10 [kt] 329.0 327.6 -1.41 -0.43% 221.3 213.7 -7.63 -3.45%
Total Suspended Particles - TSP [kt] 1,970.2 1,985.3 15.05 0.76% 359.8 369.4 9.58 2.66%
Black Carbon - BC [kt] 35.8 35.7 -0.11 -0.31% 14.7 14.6 -0.10 -0.64%
Other
Carbon Monoxide - CO [kt] 12,499.7 12,522.3 22.61 0.18% 2,682.9 2,850.0 167.04 6.23%
Heavy Metals
Priority HM
Lead - Pb [t] 2,250.0 2,285.2 35.15 1.56% 220.3 237.0 16.67 7.56%
Cadmium - Cd [t] 23.6 30.4 6.87 29.12% 6.6 12.9 6.34 96.57%
Mercury - Hg [t] 34.8 35.5 0.69 1.96% 9.1 10.0 0.93 10.26%
Other HM
Arsenic - As [t] 82.4 86.8 4.39 5.32% 5.0 8.7 3.77 75.79%
Chrome - Cr [t] 141.9 169.7 27.78 19.58% 56.7 82.0 25.31 44.65%
Copper - Cu [t] 1,714.2 1,883.7 169.46 9.89% 2,240.2 2,403.9 163.65 7.31%
Nickel - Ni [t] 285.9 341.6 55.70 19.48% 80.0 138.4 58.36 72.93%
Selenium - Se [t] 3.5 7.0 3.55 101.35% 3.4 9.2 5.75 168.28%
Zinc - Zn [t] 1,712.4 1,687.1 -25.34 -1.48% 2,070.5 2,015.0 -55.55 -2.68%
Persistent Organic Pollutants - POPs
Dioxines & Furanes - PCDD/F [g] 750.5 805.9 55.40 7.38% 61.9 119.3 57.417 92.78%
Polycyclic Organic Hydrocarbons - PAHs
Benzo(a)pyrene - B[a]P [t] 138.7 138.7 0.04 0.03% 26.5 27.3 0.84 3.15%
Benzo(b)fluoranthene - B[b]F [t] 3.1 3.2 0.09 2.76% 1.3 1.3 0.06 4.81%
Benzo(k)fluoranthene - B[k]F [t] 1.8 1.9 0.09 4.87% 1.0 1.0 0.06 6.31%
Indeno(1,2,3-c,d)pyrene - I[1,2,3-c,d]P [t] 1.3 1.4 0.15 11.82% 0.7 0.8 0.09 12.69%
Polycyclic Aromatic Hydrocarbons - PAH 1-4 [t] 373.1 373.6 0.44 0.12% 163.7 168.6 4.86 2.968%
Other POPs
Hexachlorobenzene - HCB [kg] 27.2 112.5 85.27 313.41% 8.5 12.4 3.94 46.34%
Polychlorinated Biphenyls - PCBs [kg] 1,735.7 1,735.6 -0.06 0.00% 232.5 229.0 -3.46 -1.49%

1 Base Year of reporting: 1990; excumptions: PM2.5 and PM10: 1995 and BC: 2000

Reasons overview

1. revision of activity data

  • NFR 1.A: updated NEB 2015

2. revision of entire model

  • 3.B & 3.D: Some information (e.g. weight data, milk yield, statistical data) were updated.
  • 3.D.f: Model for the calculation of HCB emissions was updated.

3. newly implemented EF

  • NFR 2: EFs for heavy metals
  • NFR 3: updated Guidebook EFs for NH3, NOx and particles were considered.

4. revision of emission factors

  • NFR 1.A.4 stationary

5. re-allocation of activity data and emissions

  • mobile sources in 1.A and product use in 2.G: re-allocation of HM emissions from the unintended co-incineration of lubricants from 1.A to 2.G

6. as an outcome of the ongoing review activities under both UNFCCC and UNECE

  • NFR 3.D: Application of sewage sludge to soils, emissions of NH3 and NOx are reported for the first time.
  • NFR 5.E: Emissions from Buildings- and Car Fires as a new source.

(see recalculations listed above: revisions marked with * occured due to review findings)

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