SP2 Measurements during ACTIVE The SP2 uses Single Particle Laser Induced Incandescence to measure the mass loading of Black Carbon on a particle by particle basis. It is possible to determine the thickness of the coating on black carbon particles Scattering diameter is also derived from the instrument for particles greater than 200 nm. During ACTIVE, the incandescence signals were triggered using the scattering signal of single particles and so were not measured for sizes below 200 nm. The first deployment of the Manchester SP2 took place during ACTIVE It was deployed on the Egrett alternately with NO x It was not operated in a temperature and pressure controlled housing and so high altitude data are not reliable. Ascent profile data for particle size are available and have been quality assured and delivered for 8 flights between 27/11/05 and 14/02/2006 Black carbon mass loading profiles are available on only a limited number of these flights.

Flight indexDateAltitude TE0527/11/ km AE0701/12/ km AE2127/01/ km SE2403/02/ km AE2506/02/ km AE2812/02/ km AE2913/02/ km AE3014/02/ km SP2 data quality assured flights The flights and dates on which validated SP2 data were collected is shown, together with the altitude range over which quality assured data were available.

Line denotes mean value, error bar is +σ

Schwarz et al [2006] A comparison with data taken on the ER2 aircraft by Schwarz et al [2006].

Comparison of Dornier and Egrett BC Factor of 10?