Several commercial airliners are fitted with BCP/BCPD instruments and have been flying for several years collecting a large database of encounters with ice clouds at cruise altitude and water and mixed-phase clouds during take off and landings. In real time this could give warnings to pilots as mentioned above. The collected database could create a very useful near global dataset of cirrus cloud properties encountered during flights for comparisons with numerical weather prediction models and also satellite measurements as well as give a near global climatology of ice water content for weather and climate models. Cirrus clouds are important for climate modulation and can sometimes be difficult to measure with satellites.
The instrument has been shown to work well in liquid water clouds (Beswick et al. 2014, 2015, Baumgardner et al. 2017). Here we will report on the comparison of BCP and BCPD measurements on the FAAM BAe-146 aircraft with simultaneous measurements of ice water content using the Nevzorov probe (Korolev et al. 1998, 2013) to determine how well ice water content can be detected by the IAGOS BCP system.
Baumgardner, D., Newton, R., Freer, M., and Axisa, D. 2017: The Backscatter Cloudprobe with Polarization Detection: A New Aircraft Ice Water Detector, AIAA 2017
Beswick, K., Baumgardner, D., Gallagher, M., Volz-Thomas, A., Nedelec, P., Wang, K.-Y., and Lance, S., 2014: The backscatter cloud probe – a compact low-profile autonomous optical spectrometer, Atmos. Meas. Tech., 7, 1443-1457, doi:10.5194/amt-7-1443-2014.
Beswick, K., Baumgardner, D., Gallagher, M., Raga, G.B., Minnis, P., Spangenberg, D. A., Volz-Thomas, A., Nedelec, P., Wang, K-Y., 2015: Properties of Small Cirrus Ice Crystals from Commercial Aircraft Measurements and Implications for Flight Operations, Tellus B, 67, 27876, http://dx.doi.org/10.3402/tellusb.v67.27876.
Korolev, A. V., Strapp, J. W., Isaac, G. A., and Nevzorov, A. N.: The Nevzorov airborne hot-wire LWC-TWC probe: principle of operation and performance characteristics, J. Atmos. Ocean. Tech., 15, 1495–1510, 1998.
Korolev, A. V., Strapp, J. W., Isaac, G. A., and Emery, E.: Improved airborne hot-wire measurements of ice water content in clouds, J. Atmos. Ocean. Tech., 30, 2121–2131, 2013.