Aerosol observations at Cardington

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Presentation transcript:

Aerosol observations at Cardington Simon Osborne, Aerosol Working Group meeting, 15th February 2011 © Crown copyright Met Office

Reasons for measuring aerosol at the Cardington field site Model verification Long term data (years) Campaigns that may benefit from aerosol data e.g. COALESC Fog Visibility Sporadic aerosol events e.g. volcanic ash © Crown copyright Met Office

DMT cloud droplet probe Univ of Herts “dust sonde” – DCS, OPC ? Tethered balloon: approx. 5500ft ceiling fair weather DMT cloud droplet probe Univ of Herts “dust sonde” – DCS, OPC ? GRIMM OPC ? © Crown copyright Met Office

Remote sensing: Prede POM-01L sun and sky scanning radiometer (SKYNET) 2. Halo Photonics StreamLine, Doppler lidar (backscatter and vertical velocity), 1.55 mm. 3. Jenoptik CHM15K lidar, 1.064 mm © Crown copyright Met Office

Others… 1. Belfort model 6230A visibility sensor (fwd scatter) 2. Campbell Sci. PWS-100, 0.830mm (fwd & back scatter), extinction coeff sensitivity 110-5 m-1 © Crown copyright Met Office

FUND hut in-situ aerosol instruments GRIMM 1.109 aerosol OPC (0.12–15 mm radius) GRIMM 5.403 CPC (butanol-based) GRIMM Vienna-type DMA (11–1100nm) Optec NGN-3a integrating polar nephelometer (optional 2.5 mm spiral cut inlet) Controllable humidifier (aircraft design), 1 hr half-cycle Running since 1 Jan 2011 SMPS © Crown copyright Met Office

© Crown copyright Met Office

© Crown copyright Met Office

© Crown copyright Met Office

Optec NGN-3a Truncates at 5º and 175 º LED light source 0.53 mm 1 min time resolution 7 lpm fixed flow rate resolution = 110-7 m-1, sensitivity probably = 110-6 m-1 illuminated sample volume  29 cm3 Calibration: clean air and R134a (HFC refrigerant) Air = 1.0, CO2 = 2.5, R134a = 7.25 © Crown copyright Met Office

November 2010: Optec vs TSI 3563 comparison 1 min data, ambient aerosol Optec error quoted as ~7% TSI error 10–20 % truncation error wavelength error © Crown copyright Met Office

Optec vs GRIMM Mie dry aerosol scattering (no cut) 1 Jan – 9 Jan 2011, 10 min averages Assumed chemistry: m = 1.598+0.01412i (EUCAARI) Mie w0 = 0.88 – 0.94 ambient RH = 67– 96% grad = 0.985 © Crown copyright Met Office

EXTRA SLIDES © Crown copyright Met Office

Optec and GRIMM Mie dry scatter time series 1 Jan – 9 Jan 2011 © Crown copyright Met Office

Fractional contribution of large particles (D>2 Fractional contribution of large particles (D>2.5mm) to total GRIMM Mie scatter low loadings high loadings mean = 3.5% © Crown copyright Met Office