Next generation radar precipitation measurement in the Swiss ......Next generation QPE in the Swiss...
Transcript of Next generation radar precipitation measurement in the Swiss ......Next generation QPE in the Swiss...
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Federal Department of Home Affairs FDHAFederal Office of Meteorology and Climatology Mete oSwiss
Next generation radar precipitation measurement in the Swiss Alps: strategy and first results
Urs Germann, MeteoSwiss, Locarno-MontiM Gabella, L Panziera, M Sartori, I Sideris, M Boscacci, A Hering, L Clementi, M Sassi
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Design of new Swiss radar networkis driven by experience, new technology and applications .
2006-2011 (6y)
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Maggia river in Solduno926 km2, southern SwitzerlandTough from radar point of view (heavily shielded, strong clutter, and persistent orographic rainfall)
Typical runoff: 10 m3/sAbout once in a year: >1000 m3/s
2006-2011 (6y)
Select eventswith 16 highestrunoff.
Make 2 groups: • 8 heaviest• rank 9-16
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Total rainfall
(sum overall events)
rank 9-168 heaviest
mm50 1800
mm50 1800
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mm mm
Contributionof
convectivecells
%%10 90 10 9050 50
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CFAD: Contour frequency altitude diagram 8 heaviest rank 9-16
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Panziera et al, in preparation
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High resolution in vertical dimension� to understand orographic precipitation
(combining Doppler and polarimetry)� to determine the VPR� to estimate precipitation at ground in shielded
regions � to reduce stochastic part of QPE processing
(VPR, partial shielding, Z-R, …)
Scan strategy
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Full scan in short time� 20 sweeps in 5 min to properly sample the
vertical dimension + thunderstorm evolution� 10 + 10 interleaved sweeps to obtain
pseudo 2.5min resolution� “oversampling” at low angles to improve QPE
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Hei
ght
up to18 km
old 3rd generation
20 sweeps every 5 minutes
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Hei
ght
0 km
Distance from antenna0km up to
246km
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Dedicated nowcasting systembased on radar/raingauge/modelto predict debris flow risk atlocation of gas pipeline
Poster by L Clementi (93 NOW)
Dedicated nowcasting systembased on radar/raingauge/modelto predict debris flow risk atlocation of industry/highway
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System designReal-time availability�Products ready on server <1 min after scan�Products updated every 2.5 min
combining latest 2 half-scans (to be refined)
Clutter � all moments at 83 m radial resolution
transferred to central server� add polarimetry for clutter removal (to be done)
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� add polarimetry for clutter removal (to be done)
� short pulse-length of 0.5 mus (83m resolution)
(…)
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3 radars replaced by completely newPolarimetric Doppler C-band systemswith ROEL design
Start construction of 2 additional radar
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2 additional radar stations in the inneralpine regions
5 identical systems
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Test equipment• ZDR: 0.67 dB bias (Rx H, Tx 135°)
In agreement with: drizzle 0.8; sun 0.8
• rhoHV (Rx H, Tx 135°)• pulse shape• scan strategy• cross-pol isolation• beamwidth and side lobes in H, V behind radome
Cimetta1645 m.a.s.l.
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M Gabella, M Sartori, in collaboration with armasuisse
Receiver
Transponder
Lema radar1625 m.a.s.l.
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Sun: monitoring Rx and antenna pointingNoise source: continuous automatic calibration
11Next generation QPE in the Swiss Alps, Urs GermannFollowing I Hollemann et al
M Gabella, M Boscacci
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Very 1 st image of new Lema radar
100 km
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AlbisLosses (Tx, Rx, Radome, NF):
old: 14.5 dBnew: 4.9 dB
Transmitted power: old: 270 kWnew: 235 kW per channel (loosing 0.6 dB)
Higher sensitivity
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9 dB more sensitivity thanks to - moving transmitter on tower, - using digital receiver technology, and- moving receiver on the antenna (ROEL)
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Zh83mgates
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QPE
dBZ40 55250
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Zh83mgates
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QPE
dBZ550 4025
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QPE design
�Use all sweeps and radars above a ground pixel in a weighted manner
�Go directly from multi-radar high resolution polar data to surface QPE(i.e. no CAPPI, no single-radar QPE)
�Start with single polarisation
Polarimetry
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�Design algorithm such that QPE converges to single-pol QPE in caseof failure of polarimetry
�Watch out for contamination ofpolarimetry by side lobe clutter
�Remind that in the Alps the lowestradar measurements are often in themelting layer or above
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Tentative steps with polarimetry: R(KDP)
raingauge
15-16 UTCGauge 44 mmZh 13 mmKDP 40 mm
7 July 2011, 1525 UTC
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raingaugeLugano @ 10.7 km/111.3°
83 m gates
Dual-Polarisation Weather Radar Handbook, Bringi et al., 2007
R Notarpietro, M Gabella
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Real-time radar-raingauge merging
Universal co-krigingRadar-only QPE
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-0.8 Bias/dB (best is 0.0) -0.082.7 SCATTER/dB (best is 0.0) 2.2
(evaluated at hourly scale, pooling 12 representative events)See also:
Talk 3A.6: I Sideris et alTalk 3A.4: R Erdin et al
Poster 20: D Keller et al
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Thank you
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1st generation 1961 4th generation 2012
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Don’t sacrifice the vertical resolutiondBZ
25
40
55
mm/h
1
10
100
last
60km40200-20-40
Full volume: 20 elevations every 5min
Hei
ght A
SL
[km
]
12
0
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13
25
0.2
1
Lowest 4 every 5min, full 9 every 15min
East-west distance [km] 60km40200-20-40
Hei
ght A
SL
[km
]
12
0
East-west distance [km] 60km40200-20-40
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Improve inneralpine coverage
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Inneralpine coverage and backup
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