Transcript CARIBIC meteorological support Update Peter van Velthoven, KNMI

CARIBIC meteorological support
Update
Peter van Velthoven, KNMI
Status: complete up to June 2007
WAS-trajectories
8 day backward trajectories every 6 seconds (0.1 min)
WAS-samples are taken within a minute so the trajectories stick very
close together, therefore:
15 additional trajectories are calculated in a cube centred around the
sample to indicate uncertainty.
0.97 pwas
pressure
pwas
WAS
0.8 latitude
1.03 pwas
0.8 longitude
WAS sample 22 from flight 153
31 May 2006
WAS trajectories (each 6 secs)
WAS “volume” trajectories
Ordinary trajectories for
1 flight hour (5-day back)
New ECMWF scheme for water
vapour (super)saturation over ice
From 13 september 2006 onward
Tompkins, Gierens & Rädel:
QJRMS, 133, 622, p.53, 2006
ECMWF newsletter 109, p. 26, 2006
New ECMWF scheme for water
vapour (super)saturation over ice
New ECMWF scheme for water
vapour (super)saturation over ice
The CARIBIC flights Frankfurt-Canton:
PV folds around the Tibetan plateau
Flight 130/133 November 2005
Most southern flight (into tropical air)
Flight 146/149 April 2006
Streamer / deep fold
Flight 150/153 May 2006: fold + deep clouds
Flight 154/157 5-7 July 2006
Above/in fold (subtropical TP break)
Flight 155/156 6 July 2006
Canton-Manila
Mid tropospheric fold
Flight 158/161 31 July/2 August 2006
PV remnants
Flight 162/165 September 2006
Deep convective cloud?
Flight 166/169 October 2006 : 2(!) folds
Flight 170/173 November 2006
Cold air
outbreak
Deep into
stratosphere
8-9 PVU
Flight 174/177 December 2006
Blocking anticyclone/high + fold
fold
Flight 178/181 February 2007
Above/below relatively flat tropopause in high
Flight 182/185 March 2007
steep
tropopause
deep folds
Flight 186/189 April 2007
PV remnant
Flight 190/193 May 2007
Close to tropopause (TP) in “high”
Subtropical TP break sampled at 2 levels
Flight 178/181 June 2007
Subtropical TP break sampled at 2 levels
Real PV
minimum or
model artefact?
Tracer signatures?
Summary Frankfurt-Canton-Manila
• Frequent sampling of subtropical tropopause break
• Examples of flying in/above fold Frankfurt to/from Canton
• Sometimes strong subtropial (blocking) highs over Asia
• Tibetan mountains seem to be preferred location for folds
FIN
Questions?