Download - Antarctic Airborne Measurements
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Antarctic Airborne Measurements
Tom Lachlan-Cope(Alexandra Weiss, Russ Ladkin)
British Antarctic Survey
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Instruments• Temperature + Humidity• Radiation• Turbulence (wind) • Fast Temperature, Humidity and CO2• Cloud probe• Aerosol• Camera• Laser Altimeter• Surface temperature
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Human activity responsible for Larsen Ice Shelf collapse
Figure 1. Difference between positive and negative summer SAM
10-m wind field
• There is a significant recent trend in the Southern Hemisphere Mode (SAM) towards its positive phase in summer: result is 20% stronger circumpolar westerly winds.
• This reduces the blocking effect of the Peninsula, resulting in greater frequency of advection of relatively warm maritime air across the northern Peninsula from west to east (Fig. 1).
• A combination of a climatological temperature gradient across the barrier and the formation of a föhn wind (warm and dry) on the lee side causes a summer temperature sensitivity to the SAM that is three times greater east of the Peninsula than to the west.
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Pen
insu
la
Flight track
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Ascent Descent
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Sea Ice Formation
• Air/sea/ice interaction• Boundary layer modification• Formation of deep ocean currents
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IRT (surface Temp)
Air Temperature
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CONVECTIVE HEAT TRANSFER OVER THIN-ICE COVERED COASTALPOLYNYASE. K. Fiedler, T. A. Lachlan-Cope, I. A. Renfrew, and J. C. King
JGR Oceans - inpress
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Clouds
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Increase in Cloud Condensation Nuclei
• Increased CCN mean more smaller cloud drops – not more cloud.
• More smaller drops mean increased albedo (clouds are whiter).
• More smaller drops mean less precipitation• Less precipitation mean clouds last longer• So in the end more clouds – perhaps.
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What do we want to know
• Are Antarctic clouds similar to mid-latitude clouds?
• How can we represent Antarctic Clouds within climate models?
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This Season
• ICEBELL– Aircraft measurements of sea ice coincident with
ship measurements– Scanning laser altimeter fitted
• Offcap– Measurements of cross Peninsular flow– Aircraft and ground based measurements
• Cloud measurements
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Future work
• Arctic studies– Combined ground based and aircraft
measurements of aerosols and clouds.– Using BAS Twin Otter and NERC BA 146
• Aerosol inlet fitted to Twin Otter.