Chapter 8.1 - Recalculations

Last updated on 27 Feb 2020 12:36 (cf. Authors)

Rückrechnungen4.png

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 subcategories 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 specific years of the inventory as well the entire time series, 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

Under UN ECE, within the IIR, Germany focusses on recalculations in values reported for 1990 for all main pollutants, 1995 for PM2.5 and PM10 and 2000 for black carbon (BC), and the last year of the previous submission, providing the quantity (in absolute numbers and in %) of change for any recalculated emission and the reasons for the recalculations carried out

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 2017 Change
in NFR submission: 2019 2020 absolute relative 2019 2020 absolute relative
Main pollutants
NEC
Nitrogen Oxides - NOx (as NO2) [kt] 2,888.8 2,884.4 -4.38 -0.15% 1,187.5 1,288.1 100.56 8.47%
Non-Methane VOC - NMVOC [kt] 3,439.6 4,033.3 593.6 17.26% 1,068.8 1,165.4 96.66 9.04%
Sulphur Oxides - SOx (as SO2) [kt] 5,485.8 5,472.9 -12.92 -0.24% 315.5 301.7 -13.76 -4.36%
Ammonia - NH3 [kt] 755.6 760.1 4.45 0.59% 673.3 665.7 -7.57 -1.12%
Particulate Matter 0.0 0.0 0.0
Particles <2.5µm PM2.5 [kt] 200.6 212.8 12.13 6.05% 99.1 98.3 -0.72 -0.72%
Particles <10µm - PM10 [kt] 332.6 355.9 23.32 7.01% 206.0 206.7 0.76 0.37%
Total Suspended Particles - TSP [kt] 1,992.6 2,057.0 64.36 3.23% 362.0 378.0 15.95 4.41%
Black Carbon - BC [kt] 36.1 39.8 3.63 10.04% 13.3 14.0 0.72 5.45%
Other
Carbon Monoxide - CO [kt] 12,545.0 13,716.3 1,171.27 9.34% 2,831.9 3,068.2 236.27 8.34%
Heavy Metals
Priority HM
Lead - Pb [t] 2,285.2 1,919.4 -365.7 -16.01% 235.0 210.9 -24.17 -10.28%
Cadmium - Cd [t] 30.4 30.4 -0.03 -0.10% 13.1 13.1 -0.02 -0.17%
Mercury - Hg [t] 35.53 35.45 -0.08 -0.23% 9.36 8.55 -0.81 -8.64%
Other HM
Arsenic - As [t] 86.8 86.9 0.07 0.08% 8.6 9.3 0.70 8.18%
Chrome - Cr [t] 169.7 166.1 -3.54 -2.09% 83.8 77.8 -5.95 -7.10%
Copper - Cu [t] 1,883.7 632.8 -1,251.0 -66.41% 2,474.4 606.6 -1,867.8 -75.48%
Nickel - Ni [t] 341.6 340.8 -0.88 -0.26% 155.4 163.0 7.59 4.89%
Selenium - Se [t] 7.0 5.7 -1.39 -19.69% 9.4 7.5 -1.95 -20.68%
Zinc - Zn [t] 1,687.1 475.4 -1,211.7 -71.82% 2,079.8 298.0 -1,781.7 -85.67%
Persistent Organic Pollutants - POPs
Dioxines & Furanes - PCDD/F [g] 805.9 815.0 9.06 1.12% 118.8 124.4 5.64 4.75%
Polycyclic Organic Hydrocarbons - PAHs
Benzo(a)pyrene - B[a]P [t] 139.3 139.3 0.010 0.008% 28.8 29.1 0.25 0.87%
Benzo(b)fluoranthene - B[b]F [t] 3.9 3.8 -0.009 -0.242% 1.9 1.9 -0.02 -0.90%
Benzo(k)fluoranthene - B[k]F [t] 2.1 2.1 -0.019 -0.918% 1.2 1.2 -0.03 -2.42%
Indeno(1,2,3-c,d)pyrene - I[1,2,3-c,d]P [t] 1.485 1.489 0.004 0.29% 0.86 0.87 0.01 1.32%
Polycyclic Aromatic Hydrocarbons - PAH 1-4 [t] 375.04 374.98 -0.07 -0.02% 176.8 180.0 3.14 1.78%
Other POPs
Hexachlorobenzene - HCB [kg] 2,897.5 2,897.5 0.006 0.0002% 15.1 17.7 2.62 17.39%
Polychlorinated Biphenyls - PCBs [kg] 1,735.5 1,735.5 0.012 0.001% 236.4 228.0 -8.33 -3.52%

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

Reasons overview

1. revision of activity data

  • entire NFR 1.A: finalisation of National Energy Balance 2017
  • several NFR categories: revision of population data: The population in Germany has been subject to several evaluations in recent years. In the meantime, the methodology for the so-called "Census 2011" has been confirmed by the Federal Constitutional Court in the final instance with a representative survey and extrapolation by the Federal Statistical Office. On this basis, the Federal Statistical Office examined correction options for previous years and published a so-called "recalculated and extrapolated population on the basis of the 2011 census". This recalculation up to and including 1991 eliminates the gap between the 2010 population updates and the 2011 census results. The inventory team of the Single National Entity has decided to use this corrected population time series for all relevant calculations. As a result, various time series have been recalculated from 1991 up to and including 2016.
  • NFR 3.B, 3.D & 3.I: updated information and statistical data (e.g. animal numbers, weight data, milk yield: see main agricultural page under „Recalculations and reasons“, https://iir-de.wikidot.com/3-agriculture).
  • NFR 3.D.f: updated activity data in 2017.

2. update or revision of entire model

  • NFR 1.A.3.a: revision of TREMOD AV
  • NFR 1.A.3.b: fundamental revision of TREMOD
  • NFR 3.B & 3.D: updated information (e.g. N excretion for suckler cows and pullets: see main agricultural page under „Recalculations and reasons“, https://iir-de.wikidot.com/3-agriculture)
  • NFR 3-D: implementation of spreading with trailing shoe on arable land with different incorporation times (see main agricultural page under „Recalculations and reasons“, https://iir-de.wikidot.com/3-agriculture)

3. newly implemented emission factors

  • NFR 2: EFs for heavy metals
  • NFR 3.B: calculation of cattle NMVOC emission now using Tier 2 emission factors (EMEP, 2016)

4. revision of emission factors

  • NFRs 1.A.3.b i-iv: shift to mileage-based EF for PCDD/F emissions from road vehicles
  • NFR 1.A.3.b vi: shift to default EF for heavy metal emissions from tyre and brake wear as provided in the 2019 EMEP Guidebook
  • NFR 1.A.4 stationary

5. re-allocation of activity data and emissions

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

  • NFRs 1.A.3.b i-iv: implementation of PCB emissions from fuel combustion in road vehicles
  • NFR 5.D.1: emissions from domestic origin and septic tanks had to be removed from the estimation due to being decentralised technologies.

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

Unless otherwise stated, the content of this page is licensed under Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License