SMART - Albedometer

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  The Spectral Modular Airborne Radiation measurement sysTem, SMART-Albedometer, measures upward and downward spectral irradiances and radiances in the spectral range from 0.3 to 2.2 μm. The radiation is collected by optical inlets which are different for the radiance and the irradiance. The collected radiation is transmitted with fibre optical cables to spectrometers of different types. Between 0.3 to 1.0 μm the spectrometers have a spectral resolution (FWHM) of 2-3 μm. Both upper und lower sensor package are actively horizontal stabalized, which is necessary to accurately measure irradiance.
  The SMART measurements will be used to measure cloud top and surface albedo to quantify the solar energy budget in the Arctic atmosphere. Especially the cloud solar radiative forcing in dependence of surface albedo will be investigated. Spectral radiance from SMART will be used for cloud remote sensing retrieving cloud optical properites such as cloud otpical thickness, partical effective diameter and the cloud thermodynamic phase.

  
  

Name	Spectral Modular Airborne Radiation measurement sysTem
Measured species	Atmospheric Radiation
Method	Grating Spectrometry
Quantity primary	Spectral irradiance and radiance, upwelling and downwelling
Quantity secondary	Cloud reflectivity
Spectral range	0.3–2.2 μm
Location	Top and bottom openings of aircraft fuselage
Radiance Viewing Angle	2.1°
Temporal resolution	0.3 seconds

References

Wendisch, M., D.Müller, D.Schell, J.Heintzenberg (2001): An Airborne Spectral Albedometer with Active Horizontal Stabilization, J. Atmos. Ocean. Technol. 18, 1856-1866

Ehrlich, A., E. Bierwirth, M. Wendisch, J.-F. Gayet, G. Mioche, A. Lampert, J. Heintzenberg (2008): Cloud phase identification of arctic boundary-layer clouds from airborne spectral reflection measurements: Test of three approaches, Atmos. Chem. Phys. 8, 7493-7505