Chapter 8.1 - Recalculations

Last updated on 30 Aug 2017 16:53 (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 UNFCCC 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), 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

Independend from the reasons for recalculations listed above, the present submission represents an exception as

  • it is the first reporting including emission estimates for Black Carbon (BC)

Given this circumstances, a provision of qualitative and quantitative information and reasoning for the broad recalculations carried out appears not feasible.

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 2014 Change
in NFR submission: 2016 2017 absolute relative 2016 2017 absolute relative
Main pollutants
NEC
Nitrogen Oxides - NOx (as NO2) [kt] 2,881.9 2,883.4 1.5 0.05% 739.8 737.4 -2.4 -0.33%
Non-Methane VOC - NMVOC [kt] 3,389.4 3,389.7 0.3 0.01% 1,041.4 1,016.3 -25.1 -2.41%
Sulfur Oxides - SOx (as SO2) [kt] 5,311.6 5,484.9 173.3 3.26% 1,224.3 1,220.9 -3.40 -0.28%
Ammonia - NH3 [kt] 792.9 793.1 0.2 0.02% 388.0 356.8 -31.2 -8.04%
Particulate Matter
Particles <2.5µm PM2.5 [kt] 192.6 194.8 2.2 1.13% 104.4 99.9 -4.5 -4.30%
Particles <10µm - PM10 [kt] 315.9 329.0 13.1 4.16% 221.1 223.4 2.3 1.06%
Total Suspended Particles - TSP [kt] 1,925.7 1,970.2 44.5 2.32% 341.7 366.0 24.3 7.12%
(Black Carbon - BC) [kt] NR 35.8 NR 15.6 15.579
Other
Carbon Monoxide - CO [kt] 12,581.0 12,499.7 -81.3 -0.65% 2,964.4 2,719.9 -244.5 -8.25%
Heavy Metals
Priority HM
Lead - Pb [t] 2,069.7 2,250.0 180.3 8.71% 213.4 214.1 0.7 0.31%
Cadmium - Cd [t] 19.8 23.6 3.8 19.07% 6.5 6.5 0.01 0.12%
Mercury - Hg [t] 32.2 34.8 2.6 8.08% 9.1 9.2 0.1 1.12%
Other HM
Arsenic - As [t] 80.4 82.4 2.0 2.54% 5.0 5.0 0.03 0.56%
Chrome - Cr [t] 132.2 141.9 9.7 7.33% 56.5 56.7 0.2 0.27%
Copper - Cu [t] 1,712.4 1,714.2 1.8 0.10% 2,197.5 2,199.4 1.9 0.09%
Nickel - Ni [t] 279.3 285.9 6.6 2.37% 86.4 81.3 -5.1 -5.92%
Selenium - Se [t] 3.5 3.5 0.0 0.00% 3.5 3.4 -0.1 -2.50%
Zinc - Zn [t] 1,704.8 1,712.4 7.6 0.45% 2,029.2 2,030.8 1.6 0.08%
Persistent Organic Pollutants - POPs
Dioxines & Furanes - PCDD/F [g] 749.7 750.5 0.8 0.1037% 61.7 61.8 0.02 0.04%
Polycyclic Organic Hydrocarbons - PAHs
Benzo(a)pyrene - B[a]P [t] 138.7 138.7 -0.06 -0.04% 25.2 24.7 -0.5 -1.90%
Benzo(b)fluoranthene - B[b]F [t] 3.2 3.1 -0.1 -1.85% 1.3 1.2 -0.1 -3.68%
Benzo(k)fluoranthene - B[k]F [t] 1.8 1.8 -0.01 -0.32% 0.9 0.9 -0.01 -1.28%
Indeno(1,2,3-c,d)pyrene - I[1,2,3-c,d]P [t] 1.3 1.3 -0.01 -1.01% 0.7 0.7 -0.01 -1.58%
Polycyclic Aromatic Hydrocarbons - PAH 1-4 [t] 377.5 373.1 -4.4 -1.17% 158.4 153.1 -5.3 -3.38%
Other POPs
Hexachlorobenzene - HCB [kg] 27.2 27.2 0.0 0.00% 10.1 8.4 -1.7 -16.85%
Polychlorinated Biphenyls - PCBs [kg] 1,680.4 1,735.7 55.3 3.29% 236.0 232.0 -4.0 -1.72%

1PM2.5 and PM10: 1995 / BC: 2000

Reasons overview

1. revision of activity data

  • NFR 1.A: updated NEB 2014

2. revision of entire model

3. newly implemented EF

  • NFRs 1 and 2: EFs for Black Carbon (BC), mostly estimated via default-fractions f-BC as provided in the EMEP/EEA air pollutant emission inventory guidebook 2016
  • ? LANDWIRTSCHAFT ?

4. revision of emission factors

  • NFR 1.A.4 stationary
  • NFRs 1.A.3.a and 1.A.5.b: EFs for PAHs replaced by notaion key 'NE'

5. re-allocation of activity data and emissions

6. as an outcome of the ongoing review activities under both UNFCCC and UNECE
(see recalculations listed above: revisions marked with * occured due to review findings)

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