AGACC II:WP3: Aerosol properties and

radiative forcing at Uccle

Veerle De BockRoyal Meteorological Institute of Belgium

Veerle.DeBock@meteo.be

Work Package 3: AEROSOL

Task 3.1: Aerosol algorithms improvementTask 3.2: Aerosol measurements at UccleTask 3.3: Aerosol data interpretation

• Task 3.1.2. Brewer SSA retrieval

Task 3.1 Aerosol algorithms improvement

• Sensitivity of the SSA retrieval algorithm to the input parameters:

Task 3.1 Aerosol algorithms improvement

Min difference Max difference Min % difference Max % difference

Intensity + 5% 0,02 0,22 2,20% 181,82%

Intensity - 5% -0,03 -0,25 -3,30% -91,82%

Ozone + 5% 0,01 0,16 1,10% 103,23%

Ozone – 5% 0,01 -0,14 1,49% -90,91%

AOD + 0,08 0,01 0,41 1,10% 336,91%

AOD – 0,08 -0,01 -0,45 -1,01% -92,63%

• Task 3.2.1 Routine Brewer operation• Task 3.2.2. Lidar measurements

Task 3.2 Aerosol measurements at Uccle

• Data from both Brewer instruments is continuously stored and regularly checked=> submitted to WOUDC database

• AOD time series kept up to date• Analysis of 21 year time series of

simultaneous UV, global radiation, ozone and AOD measurements => paper to be submitted

Task 3.2.1 Routine Brewer operation

• coherent network of European Brewer Spectrophotometer monitoring stations

• harmonize operations + develop approaches, practices and protocols to achieve consistency in quality control, quality assurance and coordinated operations

• WG 1: instrument characterization and calibration• WG 2: algorithms development• WG 3: network governance and data management• WG 4: users, public outreach and applications

COST ES 1207 - EUBREWNET

• MLH algorithm=> validation by comparison with:

° radiosoundings° ECMWF° ALARO7

• Quality control flags

Task 3.2.2 Lidar measurements

• EUMETNET: E-PROFILE=> operational LIDAR ceilometer network=> exchange of backscatter profiles in a standard format=> archive of communicated data and metadata

• COST: TOPROF (Towards operational ground based profiling with ceilometers, doppler lidars and microwave radiometers for improving weather forecasts)

=> coordinated operation of ceilometers in Europe=> quality controlled + calibrated observations in near real time=> technical and scientific background for E-PROFILE

Task 3.2.2 Lidar

– Task 3.3.1: Comprehensive data set of aerosol optical properties

– Task 3.3.2: Aerosol modeling with Chimere and OPAC

– Task 3.3.3: Aerosol sources from backtrajectories

Task 3.3 Aerosol data interpretation

• Collaboration with BIRA Comparison of cloud screening Comparison of total AOD

Task 3.3.1 Comprehensive aerosol data set

CHIMERE (µg/m³) OPAC (particles/cm³)BC Soot

Dust Mineral (coarse mode)NH3 + H2SO4 + HNO3 Soluble

OC + PPM + SOA InsolubleSalt Seasalt (coarse mode)

Task 3.3.2 Aerosol modeling with Chimere and OPAC

Input parameters:MLH: from soundings or ALADIN model outputRH: from synoptical station at Uccle

Task 3.3.2 Aerosol modeling with Chimere and OPAC

Modeled Measured CorrelationAOD OPAC 300nm Brewer 306nm 0,34

OPAC 350nm Brewer 340nm 0,41OPAC 500nm Cimel 500nm 0,54

SSA OPAC 450nm Cimel 440nm 0,04

Task 3.3.2 Aerosol modeling with Chimere and OPAC

OPAC SSA 350nm OPAC AOD 350nm

RH class 0,68 0,08

MLH -0,34 0,36

Seasalt -0,39 0,27

Water soluble 0,39 0,59

Mineral -0,27 0,29

Insoluble -0,03 0,00

Soot -0,60 -0,03

Correlation between modeled SSA/AOD and input parameters:

Task 3.3.3 Aerosol sources from backtrajectories

• Trajectories between 1990 and 2010: =>12 clusters

Task 3.3.3 Aerosol sources from backtrajectories

• Cloudscreening for Brewer AOD measurements• Continuous Brewer data (data submission, data

analysis, COST)• Continuous Lidar data (backscatter profiles, MLH,

cloud base height, COST, EUMETNET)• CHIMERE + OPAC• First results of backtrajectory analysis

To conclude: what have we done so far?

• Calibration of Brewer instruments • Installation of nephelometer • Installation of 3 new lidars: Zeebrugge,

Diepenbeek, Humain• Continue collaboration with BIRA• Fine-tuning OPAC • Continue backtrajectory analysis

To conclude: future planning

Thank you for your attention!