Gap-filling of the EU-27 CLRTAP Gap-filling of the EU-27 CLRTAP inventoryinventory

Sabine Göttlicher, Katarina Mareckova and Michael GagerSabine Göttlicher, Katarina Mareckova and Michael GagerETC/ACC (Umweltbundesamt, Austria) ETC/ACC (Umweltbundesamt, Austria)

Martin Adams Martin Adams European Environment AgencyEuropean Environment Agency

11th Joint EIONET andTask Force on Emission Inventories andProjections Meeting Cyprus May 2010

Table of ContentsTable of Contents

• Why is gap-filling necessary?• The process of gap-filling so far• Introducing a gap-filling procedure• The basic process applied in 2010• The benefits of the more complete gap-

filling procedure• Remaining issues and challenges

Why is gap-filling necessary?Why is gap-filling necessary?

• It is the responsibility of Member States to submit full and accurate inventory data sets

• Ideally, there should be no need to gap-fill the reported inventory data

• However, Member States’ submissions contain various data gaps

• The most frequent problems observed are: – Submissions are not provided for the most recent year or other years– emissions of some pollutants (e.g. PM2.5, the HMs, POPs and NH3) are not

provided for some years– sectoral emissions are missing and only national totals are provided

The process of gap-filling so farThe process of gap-filling so far

• It is a requirement of the EMEP Reporting Guidelines that submitted emission inventories be complete as possible

• Thus, the EU inventory has to be gap-filled• In previous years, the EC inventory was partially gap-filled

– official data reported by Member States under other reporting obligations (e.g. the NEC Directive and EU-MM) was used to fill gaps

• EC inventory was still incomplete for certain pollutants including at NT level

Introducing a gap-filling procedureIntroducing a gap-filling procedure

• Ideas for gap-filling were presented and discussed at previous EIONET/Task Force Meetings

• The rules for gap-filling were described in the technical paper “Proposed gap-filling procedure for the European Community LRTAP Convention emission inventory” (EEA, 2009)

• Further discussion and agreement to trail a more complete gap-filling procedure in 2010 at a meeting of Member States’ representatives in September 2009 *

*Meeting of the Air and Fuels Committee under Directive 96/62/EC: Information on the Member States reporting under the NEC Directive 2001/81/EC, 28 September, 2009, Brussels)

Introducing a gap-filling procedureIntroducing a gap-filling procedure

• The gap-filling procedure applied in 2010 was described in the CLRTAP report that was sent out for EIONET review on 8 April 2010

The basic process applied in 2010The basic process applied in 2010

MS CLRTAP emission inventory submitted to CDR in 2010 and previous years

MS MM data 2010 (CRF)

MS NEC data

CLRTAP emission inventory submitted to EMEP

Dataset complete Dataset not complete

no gap-filling

no further gap-filling

no further gap-filling

Dataset complete

Dataset complete Dataset not complete

Dataset not complete

Gap

-filli

ng w

ith o

ther

offi

cial

ly s

ubm

itted

dat

a se

ts

Dataset not complete

Further gap-filling procedures

14 MS

The basic process applied in 2010The basic process applied in 2010

Inventory gap-filled with officially submitted datasets

Furt

her g

ap-fi

lling

pro

cedu

res:

ext

ra- &

inte

rpol

ation

etc

.

first year(s) missing, then 5 consecutive years available

last year(s) missing, before 5 consecutive years available

year(s) missing in the middle

extrapolation “backwards”

extrapolation “forwards”

interpolation

gap but 5 consecutive year(s) are not available or do not follow a trend (r2 < 0.6)

previous or next year value used

6 MS

10 MS

The basic process applied in 2010The basic process applied in 2010

• Only data previously reported in NFR or CRF was used as a starting point

• NT and complete or incomplete sectoral data available: no gap-filling

• No NT and no sectoral data available: sectors gap-filled first, then sectors added up to NT

• NT but no sectoral data available: gap-filling using previous year split

The basic process applied in 2010The basic process applied in 2010

If data used as a base for gap-filling were NA or NO they were treated like 0

The basic rules applied in 2010The basic rules applied in 2010

Extrapolation was not allowed to result in negative values

The benefits of the more complete gap-filling The benefits of the more complete gap-filling procedureprocedure

• More complete EU-27 inventory• Better compliance with EMEP guidelines• Gaps in NT for CO and NH3 filled• Possible to present trends for HMs and

POPs

0

20

40

60

80

100

120

1990 1995 2000 2005

Index (1990 = 100)

Pb Cd Hg

0

20

40

60

80

100

120

1990 1995 2000 2005

Index (1990 = 100)

PCDD/F total PAHHCB HCHPCB

Remaining issues and challengesRemaining issues and challenges

Remaining issues and challengesRemaining issues and challenges

Remaining issues and challengesRemaining issues and challenges

Any recommendations and suggestions for improvement are

welcomeContact:Sabine Göttlicher (ETC/ACC)sabine.goettlicher@umweltbundesamt.at

ETC/ACC is financially supported by the European Environment Agency