Substructure of a MAP-Streamer
description
Transcript of Substructure of a MAP-Streamer
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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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Evolution of PV @ 320 K
18 UTC 5 Nov. 12 UTC 6 Nov. 06 UTC 7 Nov.
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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)
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Lagrangian Forward Projection
t =
t =
• bases on RDF technique (Sutton et al. 1994)
• 3D – Trajectories backwardsfrom a prespecified domain
• Projection of a geographical marker or conserved (or non-conserved) tracer from an earlier position to the prespecified domain.
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horizontal WV reconstruction
Meteosat WV vertically integrated WV of analysis
vertically integrated WV of LFP for 24 hours
white = dry
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Interpretation
LFP for 24 hours to the 450 hPa surface
increase in pressure increase in pot. temperature
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WV DIAL & analysis
Longitude
water vapour observed by DIAL (DLR)
Hei
ght (
km)
10
6
8
Hei
ght (
km)
0 E 4 E 8 E
0.01 0.02 0.04 0.08 0.12 g/kg
8
6
10
water vapour from ECMWF analysis, interpolated to observation time.
dry humid
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WV DIAL & LFP
10
6
8
0 E 4 E 8 E
8
6
10
Longitude
water vapour observed by DIAL (DLR)
Hei
ght (
km)
H
eigh
t (km
)
0.01 0.02 0.04 0.08 0.12 g/kg
water vapour,LFP for 15h, based on ECMWF analyses
dry humid
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WV DIAL & long LFP
10
6
8
8
6
10
0 E 4 E 8 E
water vapour,LFP for 39h, based on ECMWF analyses
Longitude
water vapour observed by DIAL (DLR)
Hei
ght (
km)
H
eigh
t (km
)
0.01 0.02 0.04 0.08 0.12 g/kg
dry humid
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10
6
8
0 E 4 E 8 E
8
6
10
Longitude
backscatter ratio (aerosols) observed by DIAL (DLR)H
eigh
t (km
)
H
eigh
t (km
)
0.01 0.02 0.04 0.08 0.12 g/kg
water vapour,LFP for 39h, based on ECMWF analyses
backscatter ratio & long LFP
(from Hoinka et al., 2003)
dry humid
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Striation: Interpretation
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Streamers breakup, 18 hours composite
contours: LFP for 24 hours to the 310 K surface
increase in pressure increase in pot. temperature
composite 12 UTC 06 to 06 UTC 07
PV @ 310 K
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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 Alpsand corresponding upper level negative PV anomaly
Large scale advection explains significant portion of mesoscale structures
LFP relates Lagrangian evolution to Eulerian fields
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21. May 2003
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21. May 2003
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21. May 2003
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21. May 2003