The Mixed-Phase Arctic Cloud Experiment.

Journal Article · Thu Feb 01 04:00:00 EST 2007 · Bulletin of the American Meteorological Society, 88(2):205-221

DOI:https://doi.org/10.1175/BAMS-88-2-205· OSTI ID:985074

Verlinde, J; Harrington, Jerry Y; McFarquhar, Greg; Yannuzzi, V T; Avramov, Alexander; Greenburg, S; Johnson, N; Zhang, G; Poellot, Michael; Mather, Jim H; Turner, David D; Eloranta, E W; Zak, Bernard D; Prenni, Anthony J; Daniel, J S; Kok, G L; Tobin, D C; Holz, R E; Sassen, Kenneth; Spangenberg, D ; Minnis, Patrick; Tooman, Tim P; Ivey, Mark D; Richardson, S J; Bahrmann, C P; Shupe, Matthew D; DeMott, Paul J; Heymsfield, Andrew J; Schofield, R

In order to help bridge the gaps in our understanding of mixed-phase Arctic clouds, the Department of Energy Atmospheric Radiation Measurement Program (DOE-ARM) funded an integrated, systematic observational study. The major objective of the Mixed-Phase Arctic Cloud Experiment (M-PACE), conducted September 27–October 22, 2004 during the autumnal transition season, was to collect a focused set of observations needed to advance our understanding of the cloud microphysics, cloud dynamics, thermodynamics, radiative properties, and evolution of Arctic mixed-phase clouds. These data would then be used to improve to both detailed models of Arctic clouds and large-scale climate models. M-PACE successfully documented the microphysical structure of arctic mixed-phase clouds, with multiple in situ profiles in both single-layer and multi-layer clouds, over the two ground-based remote sensing sites at Barrow and Oliktok Point. Liquid was found in clouds with temperatures down to -30C, the coldest cloud top temperature below -40C sampled by the aircraft. The remote sensing instruments suggest that ice was present in low concentrations, mostly concentrated in precipitation shafts, although there are indications of light ice precipitation present below the optically thick single-layer clouds. Flights into arctic cirrus clouds revealed microphysics properties very similar to their mid-latitude in situ formed cousins, with dominant ice crystal habit bullet rosettes.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 985074
• Report Number(s): PNNL-SA-48176
• Journal Information: Bulletin of the American Meteorological Society, 88(2):205-221, Journal Name: Bulletin of the American Meteorological Society, 88(2):205-221 Journal Issue: 2 Vol. 88; ISSN 0003-0007; ISSN 1520-0477
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIRCRAFT
CLIMATE MODELS
CLOUDS
PRECIPITATION
RADIATIONS
REMOTE SENSING
THERMODYNAMICS