Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research
description
Transcript of Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research
![Page 1: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/1.jpg)
The Radar Quality Control and Quantitative Precipitation Estimation Intercomparison Project
RQQI(pronounced Ricky)
Paul Joe and Alan Seed
Environment CanadaCentre for Australian Weather and Climate Research
Acknowledgement: Sempere-Torres, Keenan, Kitchen, Zhang, Sireci, Donaldson, Alberoni, Dixon, Hubbert, Balducci, Seo, Liu, Kimata, Seltmann, Levizzani, Haase, Kimata, Liu, Koistinen, Michelson, Holleman, Beerkhuis, Vaisala, Gematronix, Howard et al
![Page 2: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/2.jpg)
Outline
• Why now? Applications and Science Trends• The Promise• The Problem• The Processing • The Project
– Metrics– Data– Modality
• Summary
![Page 3: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/3.jpg)
Why Now?
![Page 4: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/4.jpg)
Progress in the Use of Weather Radar
• Qualitative – understanding, severe weather, patterns
• Local applications• Instrument level
quality control
• Quantitative– hydrology– NWP– Data Assimilation– Climate
• Regional Exchange• Global quality control
Before/Now Now/Emerging
See Sireci, Turkish Met Service Poster
![Page 5: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/5.jpg)
Local Applications: Severe WeatherUnderstanding – Qualitative Use
![Page 6: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/6.jpg)
Local Application: Hydrological Application for Flash Flooding
Sempere-Torres
![Page 7: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/7.jpg)
Regional:Radar Assimilation and NWP
Weygandt et al, 2009Reflectivity Assimilation
![Page 8: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/8.jpg)
Global: Precipitation Assimilation and NWP/ECMWF
Lopez and Bauer, 2008
![Page 9: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/9.jpg)
Climate Applications
![Page 10: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/10.jpg)
Why Radar?
Climate, Weather, Global CPC Station List Chris Kidd
![Page 11: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/11.jpg)
Royal Bafokeng Stadium, RustenbergWorld Cup 2010
Sampling10,000 gauges, 15 cm diameter, fit inside half of the center circle at Royal Bafokeng Stadium, South Africa
![Page 12: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/12.jpg)
Representativeness
10,000 gauges, 10km correlation length, 1.6x10-5 % of Earth’s surface
Habib and Krajewski, 2001
![Page 13: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/13.jpg)
The Promise
![Page 14: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/14.jpg)
The Potential: Radar-Raingauge TraceR
ain
Rat
e [m
m/h
]
![Page 15: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/15.jpg)
Almost A Perfect Radar!
Michelson, SMHI
Accumulation – a winter season log (Raingauge-Radar Difference)
No blockageRings of decreasing value
Difference increases range!
almost
![Page 16: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/16.jpg)
Vertical Profiles of Reflectivity
1. Beam smooths the data AND2. Overshoots the weather
Explains increasing radar-raingauge difference with range
Joss-Waldvogel
![Page 17: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/17.jpg)
No correction VPR correction
FMI, Koistinen
![Page 18: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/18.jpg)
The Problem
![Page 19: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/19.jpg)
OverreportNo echo
Underreport
underreport
Underreport
No echo
Overreport
Overreport
Overreport
Underreport
Problem: The Environment
![Page 20: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/20.jpg)
Bright Band
Bright Band RLAN Challenger Sea Clutter
![Page 21: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/21.jpg)
Insects and BugsClear Air Echoes
Insects, bad for QPE but good for winds, NWP
One man’s garbage is another man’s treasure!
![Page 22: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/22.jpg)
Flare Artifact Signature of Hail
Severe Attenuation
Peter Visser SAWSOne man’s garbage is another man’s treasure!
![Page 23: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/23.jpg)
The Processing
Electromagnetics to Essential Climate Variable
![Page 24: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/24.jpg)
Starting Point of QPE ProcessingCalibrated and maintained radar.
Transmitter/Receiver RCP-02
Radar Control Processor
RVP-7Radar Video Processor
Antenna Driver
Antenna&Pedestal
RURALUNIX Computer
MONPCUNIX Computer
Network
A complex instrument but if maintained is stable to about 1-2 dB cf ~100 dB.
Note TRMM spaceborne radar is stable to 0.5 dB.
Radar WMO Turkey Training Course
![Page 25: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/25.jpg)
Conceptual QPE Radar Software ChainAdjustments from EM to QPE
1st RQQI Workshop
-Ground clutter and anomalous prop
-Calibration/Bias Adjustment
-VPR correction
![Page 26: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/26.jpg)
The Project
![Page 27: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/27.jpg)
RQQI
• A variety of adjustments are needed to convert radar measurements to precipitation estimates
• Various methods are available for each adjustment and dependent on the radar features
• A series of inter-comparison workshops to quantify the quality of these methods for quantitative precipitation estimation globally
• The first workshop will focus on clutter removal, “calibration” or bias adjustment, (Vertical Profile Reflectivity Correction?)
![Page 28: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/28.jpg)
Doppler Filtering
![Page 29: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/29.jpg)
SNOWRAIN
Too much echo removed! However, better than without filtering?
![Page 30: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/30.jpg)
Combination of Signal and Data Processing Removal of Ground Clutter and Anomalous Propagation Echoes
NONQC QC
Liping Liu, CMA; Hubbert, Kessinger, Dixon NCAR
![Page 31: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/31.jpg)
Relative Metrics
• Metrics– “truth” is hard to define or non-existent. – result of corrections will cause the spatial and temporal statistical
properties of the echoes in the clutter affected areas to be the same as those from the areas that are not affected by clutter
– UNIFORMITY, CONTINUITY AND SMOOTHNESS. • Temporal and spatial correlation of reflectivity
– higher correlations between the clutter corrected and adjacent clutter free areas
– improvement may be offset by added noise coming from detection and infilling
• Probability Distribution Function of reflectivity– The single point statistics for the in-filled data in a clutter affected
area should be the same as that for a neighbouring non-clutter area.
![Page 32: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/32.jpg)
Reflectivity Continuity Metric
Highly Variable More uniform, smoother, more continuous
![Page 33: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/33.jpg)
Radial Velocity Accumulation
![Page 34: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/34.jpg)
Variance Metric
Similar to before except area of partial blockage contributes to lots of scatterAlgorithms that are able to infill data should reduce the variance in the scatter!
Michelson
![Page 35: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/35.jpg)
Data Sets and Modality• No Weather
– urban clutter (hard), – rural clutter (silos, soft forests), – mountain top- microclutter – valley radar-hard clutter– intense AP– mild anomalous propagation– intense sea clutter [Saudi Arabia]– mild sea clutter [Australia]
• Weather– convective weather– low-topped thunderstorms– wide spread weather– convective, low topped and wide spread cases
with overlapping radars• Modality
– Short data sets in a variety of situations• Some synthetic data sets considered
– Run algorithms and accumulate data– Independent analysis of results– Workshop to present algorithms, results
![Page 36: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/36.jpg)
Deliverables• Test Data Sets
– Alan Seed, BOM• Workshop – Hydrological Applications of Weather Radar
– Malcom Kitchen, UKMO• Documentation
– A better and documented understanding of the relative performance of an algorithm for a particular radar and situation
– A better and documented understanding of the balance and relative merits of identifying and mitigating the effects of clutter during the signal processing or data processing components of the QPE system.
– A better and documented understanding of the optimal volume scanning strategy to mitigate the effects of clutter in a QPE system.
– A legacy of well documented algorithms and possibly code. • Best Practices and quality description
![Page 37: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/37.jpg)
Inter-comparison Expert Panel
• Yoshihisa Kimata, JMA, Japan• Liping Liu, CAMS/CMA, China• Alan Seed, CAWCR, Australia• Daniel Sempere-Torres, GRAHI, Spain• Vincenzo Levizzani, WCRP/WGRN• Dixon or Hubbert, NCAR, USA• OPERA• NOAA
![Page 38: Paul Joe and Alan Seed Environment Canada Centre for Australian Weather and Climate Research](https://reader036.fdocuments.net/reader036/viewer/2022081603/56813b4a550346895da437ed/html5/thumbnails/38.jpg)
Summary and Challenges
• Many steps in processing – electromagnetics to essential climate variable, first workshop to address the most basic issues (TBD, ICE)
• RQQI’s goal is to inter-compare different algorithms for radar quality control with a focus on QPE applications
• Instrument and data analysis systems intertwined• Descriptive, quantitative data quality concepts needed• What about mixed data analysis systems? • Ultimately, the goal is to develop a method to assess the
overall quality of precipitation products from radars globally– Processing -> quality or some generic tests