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Aerosol observations at Cardington

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Presentation on theme: "Aerosol observations at Cardington"— Presentation transcript:

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

2 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

3 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

4 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, mm © Crown copyright Met Office

5 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

6 FUND hut in-situ aerosol instruments
GRIMM aerosol OPC (0.12–15 mm radius) GRIMM 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

7 © Crown copyright Met Office

8 © Crown copyright Met Office

9 © Crown copyright Met Office

10 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

11 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

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

13 EXTRA SLIDES © Crown copyright Met Office

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

15 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

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