© Crown copyright Met Office STICCS science aims Stuart Fox, Chawn Harlow, Clare Lee, Patrick Eriksson, Eric Defer + others…

© Crown copyright Met Office Main scientific aims Evaluate the performance of ISMAR – “instrument test flights” Measure the radiative properties of clear skies at millimeter and sub-mm wavelengths Measure the radiative signature of cirrus at millimeter and sub-mm wavelengths Measure the radiative signature of precipitating systems at millimeter and sub-mm wavelengths

© Crown copyright Met Office Instrument tests Thermal behaviour of key components: Local Oscillators (define channel frequencies) Intermediate-frequency amplifiers (set channel gain, strongly temperature- dependent) Calibration black-bodies Measurement biases

© Crown copyright Met Office Instrument tests Thermal behaviour of key components: Local Oscillators (define channel frequencies) Intermediate-frequency amplifiers (set channel gain, strongly temperature- dependent) Calibration black-bodies Measurement biases

© Crown copyright Met Office Instrument tests Thermal behaviour of key components: Local Oscillators (define channel frequencies) Intermediate-frequency amplifiers (set channel gain, strongly temperature- dependent) Calibration black-bodies Measurement biases

© Crown copyright Met Office Instrument tests Thermal behaviour of key components: Local Oscillators (define channel frequencies) Intermediate-frequency amplifiers (set channel gain, strongly temperature- dependent) Calibration black-bodies Measurement biases

Clear sky radiative transfer Validate radiative transfer models at millimetre and sub-mm wavelengths Water vapour spectroscopy Surface emissivity © Crown copyright Met Office

Clear sky radiative transfer Validate radiative transfer models at millimetre and sub-mm wavelengths Water vapour spectroscopy Surface emissivity Key instruments: MARSS, ISMAR Dropsondes Temperature, humidity © Crown copyright Met Office

Clear sky sorties © Crown copyright Met Office A B Spiral descent following sonde Profiles at different rates Low-level runs for surface studies

Radiative signature of Ci Measure the radiative signature of cirrus at millimetre and sub-mm wavelengths – using ISMAR to remotely sense ice cloud properties © Crown copyright Met Office

Radiative signature of Ci Measure the radiative signature of cirrus at millimetre and sub-mm wavelengths – using ISMAR to remotely sense ice cloud properties Key instruments: MARSS, ISMAR Cloud physics Dropsondes Temperature, humidity Lidar © Crown copyright Met Office

Cirrus sorties © Crown copyright Met Office A B Cloud Low-level runs for surface emission

Radiative signature of precipitation Measure the radiative signature of precipitating systems at millimetre and sub-mm wavelengths – using ISMAR to remotely sense presence of precipitation and precipitation rate Use ground-based radar for validation (e.g. Stornoway) Likely to focus on frontal systems if we can fly above the precipitating cloud Sortie brief under development © Crown copyright Met Office

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