1.A.5.b ii - Emissions from Military Aviation

Last updated on 16 Oct 2015 06:20 (cf. Authors)

Short description

In sub-category 1.A.5.b ii - Other, Mobile (including Military) emissions from military aviation are reported.

NFR-Code Name of Category Method AD EF Key Source for (by1)
1.A.5.b ii Other: Military - Mobile Combustion: Airborne T1 NS CS, D see superordinate chapter
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Method

Activity data

The Energy Balance of the Federal Republic of Germany (AGEB) provides the basis for the activity data used. Since the Energy Balance does not provide separate listings of military agencies' final energy consumption as of 1995 – and includes this consumption in line 67, under "commerce, trade, services and other consumers" – additional sources of energy statistics had to be found for source category 1.A.5.

For source category 1.A.5.b, consumption data for diesel, gasoline, and kerosene, until 1995, were drawn from a special analysis of the Working Group on Energy Balances (AGEB).

For the years as of 1995, the official mineral-oil data of the Federal Republic of Germany (Amtliche Mineralöldaten der Bundesrepublik Deutschland 2012), prepared by the Federal Office of Economics and Export Control (BAFA), are used (BAFA, 2013) [1]. Provided in units of [1000 t], these amounts have to be converted into [TJ] on the basis of the relevant net calorific values given by (AGEB, 2013) [2].

As the official mineral-oil data does not distinguish into fossil and biofuels but does provide amounts for inland deliveries of total diesel and gasoline fuels, no data on the consumption of biodiesel and bioethanol is available directly at the moment. Therefore, starting with this submission, activity data for biofuels used in military vehicles are calculated by applying Germany's official annual biofuel shares to the named total deliveries (see also: info on EF).

Due to this, compared to submission 2013, activity data for fossil diesel oil and gasoline are revised slightly for all years as of 2004 (see also: info recalculations).

As there is no consistent AGEB data availabe for aviation gasoline, delivery data from BAFA [1] is used.

Table 1: Sources for consumption data in 1.A.5.b
Relevant years Data Source
through 1994 AGEB - Special evaluation 1990-1994
since 1995 BAFA - Official oil data, table 7j, column: 'An das Militär'
Table 2: Annual fuel consumption in military aviation, in [TJ]
1990 1995 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
Jet Kerosene 38,385 16,143 9,862 3,197 4,501 7,029 5,280 2,200 2,441 2,554 3,597 4,396 3,286 4,114 1,171 2,049
Aviation Gasoline1 15.23 6.35 1.09 0.61 0.17 0.57 0.35 0.26 2.48 14.84 0.00 0.04 0.17 0.00 0.00 0.00

1 possible reason for jump in delivered amounts: storage (resulting in no (2008, 2011-2013) or very small deliveries (2009) (see also: FAQs)

Emission factors

Without better information, constant tier1 values are used mainly (see table for 2012 values below).
Here, EFs for main pollutants, CO and PM, which are conducted within TREMOD MM (ifeu, 2010) [3], have been derived from comparable sources (e.g. pre-euro1 heavy duty vehicles road transport). The tier1 values used for PCDD/F and PAH (for diesel oil only) are derived from a study carried out by (Rentz et al., 2008) [4] for the German Federal Environment Agency.

In addition, starting with the current submission, tier1 EF for exhaust heavy metal * and B[a]P emissions have been derived from (EMEP/EEA, 2013) [5], whereas for all other PAHs and the PAH total (from gasoline), no emission factors are available at present.
* Exceptions: For Lead (Pb) from leaded gasoline and corresponding TSP emissions, annually country-specific EFs are applied representing the fade-out of leaded gasoline in 1997. - For lead and TSP from leaded avgas, constant tier1 EFs based on the average lead content of AvGas 100 LL are used.

Only for SO2 from diesel annually changing tier2 values computed within TREMOD-MM (ifeu, 2010) [3] are used, representing the development of fuel qualities and mitigation technologies.

As no such specific EF are available for biofuels, the values used for diesel oil and gasoline are applied to biodiesel and bioethanol, respectively.

NOTE: As the aircraft used for military purposes differ strongly from those used in civil aviation, the country specific EF used for kerosese in 1.A.3.a could not be used for reporting emissions from 1.A.5.b as well.

Table 3: (I)EFs used for 2013 emission estimates
Main Pollutants Particulate Matter Heavy Metals Persistent Organic Pollutants
NEC Other PM2.5 ≤ PM10 ≤ TSP Main HM4,7 Other HM4 Polycyclic Aromatic Hydrocarbons PCDD/F
NH3 NMVOC NOx SO2 CO PM2.5 PM10 TSP Pb Cd Hg As Cr Cu Ni Se Zn B[a]P B[b]F B[k]F I[1,2,3-cd]P ∑PAHs Dioxins & Furans
kg/TJ kg/TJ g/TJ mg/TJ µg/TJ
Kerosene 0.00 98 205 9.30 485 12.005 12.005 12.005 NE NE NE NE NE NE NE NE NE 935 935 91.1 208 2,168 0.0010
AvGas3 NE 3001 3021 0.511 15,0002 NE NE 15.171,6 9,4813,9 NE NE NE NE NE NE NE NE 919 919 89.6 206 2,133 NE

1 country-specific tier1 emission factors from TREMOD-MM [4]
2 country-specific, annual tier2 emission factors from TREMOD-MM [4]
3 EF for NOx, SO2, and NMVOC, TSP & Pb deduced from 1.A.3.a ii (i) - Domestic Civil Aviation (LTO)
4 tier1 defaults from EMEP/EEA GB 2013 [5]
5 EF(TSP) from 'Emissionen und Maßnahmenanalyse Feinstaub 2000-2020' [6]
6 EF(TSP) also applied for PM2.5 and PM10 (assumption: > 99% of TSP from diesel oil combustion consists of PM2.5)
7 leaded gasoline banned in 1997
8 TSP from leaded aviation gasoline: EF(TSP) = EF(PB) x 1.6 (see also: FAQs)
9 EF(Pb) calculated from lead content in AvGas 100 LL (see also: 1.A.3.a ii (i) and FAQs)
10 tier1 values derived from (Rentz et al., 2008) [4]

Discussion of emission trends

This sub-category is not considered separately in the key category analysis.

Due to the application of very several tier1 emission factors, most emission trends reported for this sub-category only reflect the trend in fuel deliveries.
Therefore, the fuel-consumption dependend trends in emission estimates are only influenced by the annual fuel mix.

Nonetheless, this NFR category shows interesting trends for emissions of Lead (Pb) from leaded gasoline (until 1997) and aviation gasoline:

Until 1997, lead emissions were dominated by the combustion of leaded gasoline in military ground-based vehicles. Therefore, the over-all trend for lead emissions from military vehicles and aircraft is driven mostly by the abolition of leaded gasoline in 1997. Towards this date, the amount of leaded gasoline decreased significantly. After 1997, the only source for lead from mobile fuel combustion is avgas used in military aircraft.
As for avgas, the trend of consumption is more or less drecreasing steadily until 2005 but then shows a strong increase for 2006 and '07 (!), followed by no (2008 and 2011) or very small deliveris (2009, 2010). As mentioned above, there are no real consumption data available: AD is based on fuel deliveries to the military only. Thus, especially the trends for the use of aviation gasoline and the resulting emissions show this siginificant jumps in 2006 and 07, falling back to zero in 2008 and 2011. The party is aware of this issue and will try to solve it as soon as data allows. (see also: FAQ)

Recalculations

Over-all activity data and emission factors remain unchanged compared to submission 2014.

New emission estimates result from the implementation of tier1 EF for exhaust PAH emissions derived from default values as provided in [5]:

Table 4: Newly implemented emission factors, in [mg/TJ]
B[a]P B[b]F B[k]F I[1,2,3-c,d]P PAH 1-4 B[a]P B[b]F B[k]F I[1,2,3-c,d]P PAH 1-4
Jet Kerosene Avgas
934.58 934.58 91.12 207.94 2.168.22 919.20 919.20 89.62 204.52 2,132.55

Due to the broad changes in the NFR structure, no sector- and pollutant-specific information on the impacts on emission estimates are provided in chapter 8.1 - Recalculations with this submission.

Uncertainties

Uncertainty estimates for activity data of mobile sources derive from research project FKZ 360 16 023: "Ermittlung der Unsicherheiten der mit den Modellen TREMOD und TREMOD-MM berechneten Luftschadstoffemissionen des landgebundenen Verkehrs in Deutschland". For detailled information, please refer to the project's final report here (German version only!).

Uncertainty estimates for emission factors were compiled during the PAREST research project. Here, the final report has not yet been published.

Planned improvements

There are no sub-sector specific improvements planned at the moment.

FAQs

What is the reason for the big jumps in the consumption of aviation gasoline in 2006 & '07 and the zero-consumption in 2008?

As mentioned above, consumption is deducted from AGEB and BAFA data on the amounts of fuels delivered to the sector. Therefore, the big jumps reported for 2006 & '07 might result from the storage of aviation gasoline in military stocks.
Consequentially, the 0.00 TJ reported for 2008 show the missing of any deliveries to the military and should not be misunderstood as a non-use. The party is aware of this issue and will try to solve it as soon as data allows.

On which basis does the party estimate the reported lead emissions from aviation gasoline?

assumption by party: aviation gasoline = AvGas 100 LL
(AvGas 100 LL is the predominant sort of aviation gasoline in Western Europe)
lead content of AvGas 100 LL: 0.56 g lead/liter (as tetra ethyl lead)

2007 EMEP Corinair Guidebook:

Lead is added to aviation gasoline to increase the octane number. The lead content is higher than in leaded car gasoline,…

The applied procedure is similar to the one used for calculating lead emissions from leaded gasoline used in road transport. (There, in contrast to aviation gasoline, the lead content constantly declined resulting in a ban of leaded gasoline in 1997.)

What is the country-specific methododlogy for estimating the reported TSP emissions from aviation gasoline?

The TSP emissions calculated depend directly on the reported lead emissions: The emission factor for TSP is 1.6 times the emission factor used for lead: EF(TSP) = 1.6 x EF(Pb). - The applied procedure is similar to the one used for calculating TSP emissions from leaded gasoline used in road transport.

Why does the party report TSP emissions from leaded avgas, but no such PM2.5 or PM10 emissions?

The EF(TSP) is estimated from the EF(Pb) which has been calculated from the lead content of Avgas 100 LL. There is no information on the percetual shares of PM2.5 & PM10 in the reported TSP and therefore no EF(PM2.5) & EF(PM10) were deducted.

Why are similar EF applied for estimating exhaust heavy metal emissions from both fossil and biofuels?

The EF provided in (EMEP/EEA 2013) [5] represent summatory values for (i) the fuel's and (ii) the lubricant's heavy-metal content as well as (iii) engine wear. Here, there might be no heavy metal contained the biofuels. But since the specific shares of (i), (ii) and (iii) cannot be separated, and since the contributions of lubricant and engine wear might be dominant, the same emission factors are applied to biodiesel and bioethanol.


Bibliography
1. BAFA, 2014: Bundesamt für Wirtschaft und Ausfuhrkontrolle, Amtliche Mineralöldaten für die Bundesrepublik Deutschland;
URL: http://www.bafa.de/bafa/de/energie/mineraloel_rohoel/amtliche_mineraloeldaten/index.html, (Aufruf: 28.11.2014), Eschborn.
2. AGEB, 2014b: Arbeitsgemeinschaft Energiebilanzen (Hrsg.): Daten - Sondertabellen - Heizwerte der Energieträger und Faktoren für die Umrechnung von spezifischen Mengeneinheiten in Wärmeinheiten (2000-2013); URL: http://www.ag-energiebilanzen.de/viewpage.php?idpage=65 (Aufruf: 28.11.2014), Köln, Berlin.
3. ifeu, 2009: Helms, H., Lambrecht, U., Knörr, W. , IFEU - Institut für Energie- und Umweltforschung Heidelberg gGmbH: Aktualisierung des Modells TREMOD-Mobile Machinery, im Auftrag des Umweltbundesamtes, FKZ 360 16 018, Heidelberg, Korrigendum 11.02.2010.
4. Rentz et al., 2008: Nationaler Durchführungsplan unter dem Stockholmer Abkommen zu persistenten organischen Schadstoffen (POPs), im Auftrag des Umweltbundesamtes, FKZ 205 67 444, UBA Texte | 01/2008, January 2008, URL: http://www.umweltbundesamt.de/en/publikationen/nationaler-durchfuehrungsplan-unter-stockholmer
5. EMEP/EEA 2013: EMEP/EEA air pollutant emission inventory guidebook – 2013
6. IZT, 2007: Joerß, W. et al.: Emissionen und Maßnahmenanalyse Feinstaub 2000 – 2020, Institut für Zukunftsstudien und Technologiebewertung (IZT), Berlin, Im Auftrag des Umweltbundesamtes, FKZ 204 42 202/2, Dessau-Roßlau, August 2007 - URL: http://www.umweltbundesamt.de/sites/default/files/medien/publikation/long/3309.pdf
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