Low-Level Liquid-Containing Arctic Clouds
Cesana, G., Kay, J.E., Chepfer, H., English, J.M. and de Boer, G. 2012. Ubiquitous low-level liquid-containing Arctic clouds: New observations and climate model constraints from CALIPSO-GOCCP. Geophysical Research Letters 39: 10.1029/2012GL053385.
Against this backdrop, Cesana et al. employed real-world Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) data to document cloud phases over the Arctic basin (60-82°N) during the five-year period 2006-2011, after which they used the results they obtained "to evaluate the influence of Arctic cloud phase on Arctic cloud radiative flux biases in climate models." In doing so the five researchers report that their evaluation of climate models participating in the most recent Coupled Model Inter-comparison Project (Taylor et al., 2012) revealed that "most climate models are not accurately representing the bimodality of FLW,NET in non-summer seasons." In fact, they indicate that even when advanced microphysical schemes that predict cloud phase have been used, such as those currently employed in the fifth version of the Community Atmosphere Model (CAM5, Neale et al., 2010), "insufficient liquid water was predicted."
Cesana et al. conclude from what they learned that "the simple prescribed relationships between cloud phase and temperature that have historically been used in climate models are incapable of reproducing the Arctic cloud phase observations described here," which must inevitably lead to similarly inaccurate values of "Arctic surface radiative fluxes and Arctic climate feedbacks," when employed in current state-of-the-art climate models.
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Neale, R.B., et al. 2010. Description of the NCAR Community Atmosphere Model (CAM 5.0). Technical Note 486+STR. National Center for Atmospheric Research, Boulder, Colorado, USA.
Shupe, M.D. and Intrieri, J.M. 2004. Cloud radiative forcing of the Arctic surface: The influence of cloud properties, surface albedo, and solar zenith angle. Journal of Climate 17: 616-628.
Taylor, K.E., Stouffer, R.J. and Meehl, G.A. 2012. An overview of CMIP5 and the experiment design. Bulletin of the American Meteorological Society 93: 485-498.