Influence of cold pools on the circulation over West ... - Convection

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21 June 2011 case: Comments Dust front has a significant, 2K temperature contrast but no apparent wind structure: winds dominated by along-front easterlies. Perhaps the turbulence at the surface is suppressing the flow as in Linden and Simpson? Does the penetration <strong>of</strong> the <strong>cold</strong> pool air accelerate the NE jet? See next slide:
Interpretation / hypothesis 1 … Intrusion <strong>of</strong> <strong>cold</strong> air “sharpens” pressure gradient here. Intensification <strong>of</strong> NE jet. Lifting <strong>of</strong> PBL air by <strong>cold</strong> pool penetration. Cold pool South North Separation <strong>of</strong> <strong>cold</strong> pool and mixed layer observed by lidar / sonde 1. Cold pool mainly mixed-out by the time <strong>of</strong> the final ascent on B605.
Page 1 and 2: School of Earth an
Page 3 and 4: Typical West African Monsoon struct
Page 5 and 6: Atlantic Sahara The monsoon flow is
Page 7 and 8: Cold pool interacting with monsoon
Page 9 and 10: Following day … 6 June 2006 InSAR
Page 19 and 20: B605: cold pool fr
Page 21: 23 - 23.5N B605: Low level run (onb
Page 25 and 26: View from the cockpit: Gust front o
Page 27 and 28: Over northern Benin, 3 August 2006
Page 29 and 30: NWP biases from cold</stron
Page 31 and 32: Diurnal cycle rainfall rate compari
Page 33 and 34: Sahel - Sahara geopotential differe
Page 35 and 36: v*q (m s -1 kg kg -1 ) v*q (m s -1
Page 37 and 38: Haboobs - density currents • Fals
Page 39 and 40: Conclusions 1. NWP biases and Data
Page 41 and 42: Future plans / opportunities 1. Obs
Page 43 and 44: The end Thanks for your attention.
Page 45 and 46: Diurnal cycle in bias • Mid level
Page 47: Nephelometer data (dustloading) in

Influence of cold pools on the circulation over West ... - Convection

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