Berner FachhochschuleHochschule für Agrar-, Forst- und Lebensmittelwissenschaften HAFL

EAGER European Agricultural Gaseous Emissions Inventory Researchers Network

Joint EPMAN and TFEIP Expert Panel meetingBerlin, September 28, 2012

EAGER Network

Berner FachhochschuleHochschule für Agrar-, Forst- und Lebensmittelwissenschaften HAFL

EAGER European Agricultural Gaseous Emissions Inventory Researchers Network

EAGER: European Agricultural Gaseous Emissions Inventory Researchers Network

Background• Accurate and reliable inventories of NH3 emissions are

increasingly important• In the past different national inventories were not comparable due

to different methods used• A core group of emission inventory experts initiated EAGER to

– achieve a detailed overview of present best available inventory techniques– initiate a new generation of emission inventories

• Network founded in 2003; 1-2 workshops per year

Berner FachhochschuleHochschule für Agrar-, Forst- und Lebensmittelwissenschaften HAFL

EAGER European Agricultural Gaseous Emissions Inventory Researchers Network

EAGER: European Agricultural Gaseous Emissions Inventory Researchers Network

Key tasks • Comparison of models: how far do results agree; reasons for

differences?– Liquid manure system dairy cows, fattening pigs (paper)– Solid manure systems beef cattle, broilers (paper)

• Review of published and unpublished data on emission factors for NH3, N2O and CH4 for solid manure (paper)

• Analysis of NH3 emissions per unit product (milk, beef, pork, broiler, eggs) in different countries (ongoing)

• Exchange on ongoing and new activities

Berner FachhochschuleHochschule für Agrar-, Forst- und Lebensmittelwissenschaften HAFL

EAGER European Agricultural Gaseous Emissions Inventory Researchers Network

Approach for comparison of models• Six N-flow models from DE, DK, NL, UK, CH used for

emission inventories• Mass flow approach with animal specific

excretion rates• N/TAN flow of through different stages of

the manure handling chain is simulated• Emissions are calculated with emission

factors expresses in percentage of the TAN present a specific stage of emission

• Effects of emissions that occur in the upstream part of the manure management system on emissions on the subsequent downstream parts can be easily taken into account

Berner FachhochschuleHochschule für Agrar-, Forst- und Lebensmittelwissenschaften HAFL

EAGER European Agricultural Gaseous Emissions Inventory Researchers Network

Approach for comparison of models (2)

• Liquid manure system: A simplified dairy cow and pig scenario (only dairy scenario presented here)

• Solid manure system: Beef cattle and broiler scenarios

Scenario Nitrogen excretion [kg yr-1 N]

Emission factors

FF Fixeda Fixeda

FN Fixeda Nationalb

NN Nationalb Nationalb a) Same value used in all models b) Model-specific values used

• Three levels of model standardizations

Berner FachhochschuleHochschule für Agrar-, Forst- und Lebensmittelwissenschaften HAFL

EAGER European Agricultural Gaseous Emissions Inventory Researchers Network

Results and discussion: FF scenario liquid

• Very similar estimates of the NH3 emissions for the FF scenario underlying N flows of the different models are

highly comparablekg

NH 3-

N y

r-1

500

1000

1500

2000

2500

3000GrazingHousingStorageApplication

Berner FachhochschuleHochschule für Agrar-, Forst- und Lebensmittelwissenschaften HAFL

EAGER European Agricultural Gaseous Emissions Inventory Researchers Network

Results and discussion: FN scenario liquid• Substantial differences in emissions due to assumptions

used for emission factors (EF), e.g.:- Lowest N-fertilization of pastures for DYNAMO- Solid floor housing systems in UK- DYNAMO assumes constant

emissions per m2 during partial grazing

- Broadcast application banned in NL EF notup to date

Berner FachhochschuleHochschule für Agrar-, Forst- und Lebensmittelwissenschaften HAFL

EAGER European Agricultural Gaseous Emissions Inventory Researchers Network

10

Results and discussion: NN scenario liquid

• More substantial differences between results than FN scenario• Variation primarily result from distinct national emission

factors and N excretion rates which reflect the specific livestock and manure management systems and climatic conditions

• Similar conclusions for pig scenario

Berner FachhochschuleHochschule für Agrar-, Forst- und Lebensmittelwissenschaften HAFL

EAGER European Agricultural Gaseous Emissions Inventory Researchers Network

Results solid manure scenarios (Beef cattle)

12

FF FN NN

• Much larger variability than for slurry scenarios- Limited data available; big gaps and uncertainties in knowledge

for important processes influencing the ammonia losses- Immobilization and mineralization processes more important- Larger differences in production systems between the different

countries

Berner FachhochschuleHochschule für Agrar-, Forst- und Lebensmittelwissenschaften HAFL

EAGER European Agricultural Gaseous Emissions Inventory Researchers Network

General conclusions of the EAGER Network model comparison activities

• Thorough and critical analysis of models and intensive exchange between participants weaknesses of all models recognized and improved all partners and models profited from the exerciseharmonization between calculation procedures started

• Evidence of good comparability between N-flow models– Indication that models are following the same general procedure

and are based on comparable data and assumptions

• Relatively good agreement for slurry scenarios, the variation is much higher for solid manure scenarios

Berner FachhochschuleHochschule für Agrar-, Forst- und Lebensmittelwissenschaften HAFL

EAGER European Agricultural Gaseous Emissions Inventory Researchers Network

Publications EAGER Network• Reidy B., Dämmgen U., Döhler H., Eurich-Menden B., van Evert F.K.,

Hutchings N.J., Luesink H.H., Menzi H., Misselbrook T.H., Monteny G.-J., Webb J., 2008. Comparison of models used for national agricultural ammonia emission inventories in Europe: liquid manure systems. Atmospheric Environment, 42, 3452-3464

• Reidy B., Webb J., Misselbrook T.H., Menzi H., Luisink H.H., Hutchings N.J., Eurich-Menden B., Döhler H. Dämmgen U., 2009. Comparison of models used for national agricultural ammonia emission inventories in Europe: litter-based manure systems. Atmospheric Environment, 43, 1632-1640

• Webb J, Sommer SG, Kupper T, Groenstein CM, Hutchings N, Eurich-Menden B, Rodhe L, Misselbrook T, Amon B, 2011. Emissions of Ammonia, Nitrous Oxide and Methane During the Management of Solid Manures. In: Agroecology and Strategies for Climate Change. Sustainable Agriculture Reviews 12. Springer, 67–107

Berner FachhochschuleHochschule für Agrar-, Forst- und Lebensmittelwissenschaften HAFL

EAGER European Agricultural Gaseous Emissions Inventory Researchers Network

Relationship of EAGER to EPMAN and TFEIP Expert Panel

• EAGER is not competing but supplementing and supporting EPMAN and TFEIP Expert Panel• TFEIP Expert Panel focusses on emission inventory work

“tier 1 and 2 level“

• EAGER focuses on emission inventory work “tier 3 level“

• EPMAN focuses on mitigation options

• TFRN focuses on whole N-cycle strategies

• EAGER members actively participate in TFRN/EPMAN/TFEIP/WGSR work