caribic meteorological support update peter van velthoven, knmi status: complete up to june 2007

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?