caribic meteorological support update peter van velthoven, knmi status: complete up to june 2007
DESCRIPTION
WAS sample 22 from flight May 2006 WAS trajectories (each 6 secs) WAS “volume” trajectories Ordinary trajectories for 1 flight hour (5-day back)TRANSCRIPT
CARIBIC meteorological supportUpdate
Peter van Velthoven, KNMI
Status: complete up to June 2007
WAS-trajectories8 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.
pwas
1.03 pwas
0.97 pwas
0.8 longitude0.8 latitude
WAS pressure
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 iceFrom 13 september 2006 onward
Tompkins, Gierens & Rädel: QJRMS, 133, 622, p.53, 2006ECMWF 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 2005Most southern flight (into tropical air)
Flight 146/149 April 2006Streamer / deep fold
Flight 150/153 May 2006: fold + deep clouds
Flight 154/157 5-7 July 2006Above/in fold (subtropical TP break)
Flight 155/156 6 July 2006Canton-ManilaMid tropospheric fold
Flight 158/161 31 July/2 August 2006PV remnants
Flight 162/165 September 2006Deep 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 2007Above/below relatively flat tropopause in high
Flight 182/185 March 2007
deep folds
steep tropopause
Flight 186/189 April 2007PV remnant
Flight 190/193 May 2007Close 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?