Substructure of a MAP-Streamer Mark A. Liniger (MeteoSwiss) Huw C. Davies (IACETH) QJRMS, 129, 633-651 (MAP special issue) 12 UTC 6 Nov 1999 (MAP IOP-15)

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Presentation transcript:

Substructure of a MAP-Streamer Mark A. Liniger (MeteoSwiss) Huw C. Davies (IACETH) QJRMS, 129, (MAP special issue) 12 UTC 6 Nov 1999 (MAP IOP-15)

Evolution of 320 K 18 UTC 5 Nov.12 UTC 6 Nov.06 UTC 7 Nov.

Aim Are measured meso-scale features detectable in GCM analyzed fields? How far are observed structures linked to synoptic scale transport processes? data sources: ECMWF analysis fields (T319L60) Meteosat water vapour (WV) WV DIAL (DIfferential Absorption Lidar) flown on the Falcon aircraft of DLR (Deutsches Zentrum für Luft- und Raumfahrt)

Lagrangian Forward Projection t =  t =  bases on RDF technique (Sutton et al. 1994) 3D – Trajectories backwards from a prespecified domain Projection of a geographical marker or conserved (or non- conserved) tracer from an earlier position to the prespecified domain.

horizontal WV reconstruction Meteosat WVvertically integrated WV of analysis vertically integrated WV of LFP for 24 hours white = dry

Interpretation LFP for 24 hours to the 450 hPa surface increase in pressureincrease in pot. temperature

WV DIAL & analysis Longitude  water vapour observed by DIAL (DLR) Height (km)  Height (km)  0 E4 E8 E g/kg water vapour from ECMWF analysis, interpolated to observation time. dryhumid

WV DIAL & LFP E4 E8 E Longitude  water vapour observed by DIAL (DLR) Height (km)  g/kg water vapour, LFP for 15h, based on ECMWF analyses dryhumid

WV DIAL & long LFP E4 E8 E water vapour, LFP for 39h, based on ECMWF analyses Longitude  water vapour observed by DIAL (DLR) Height (km)  g/kg dryhumid

E4 E8 E Longitude  backscatter ratio (aerosols) observed by DIAL (DLR) Height (km)  g/kg water vapour, LFP for 39h, based on ECMWF analyses backscatter ratio & long LFP (from Hoinka et al., 2003) dryhumid

Striation: Interpretation

Streamers breakup, 18 hours composite contours: LFP for 24 hours to the 310 K surface increase in pressureincrease in pot. temperature composite 12 UTC 06 to 06 UTC K

Conclusions Pronounced dry intrusion of stratospheric origin  Spiral structure: arms of distinct origins  Striation across western flank: sandwiched boundary layer air  mixing by diffusion  Breakup over Alps: persistent diabatic processes north of Alps and corresponding upper level negative PV anomaly  Large scale advection explains significant portion of mesoscale structures  LFP relates Lagrangian evolution to Eulerian fields

21. May 2003