Evaluation of the GPM DPR Level2 algorithm over Canada

2016 PMM Science Team Meeting, Houston, TX, October 24-28, 2016

D. Hudak, P. Rodriguez, and P. Joe Cloud Physics and Severe Weather Section

Page 2 – October 25, 2016

Overview

• Physical validation of DPR L2 products over Canada– Great Lakes area– Complex orography (OLYMPEX)– High latitudes (Arctic)

• Development of an integrated observing system that combines ground based, satellite and airborneobservations

• Supports hydrological and NWP applications e.g. IMERG into Canadian Precipitation Analysis

Tier I Radar Studies

GPMGV:WKRcaselibrary(115uptoJune,2016)

Page 5 – October 25, 2016

WKR_RHI056°

GPMDPR NSZcorr nrsfc

WKR Ze

GPM slice to match WKR RHI scan Ze (dBZ)

64 52 40 28 16 4 -8 -20 -32

Ze (dBZ)

64 52 40 28 16 4 -8 -20 -32

CrossSectionAlongGPMNadir

Z_NS_SLV_zFactor CorrectedNearSurface

NS_DSD_phase

WKR_Z

Height(km)

0

10

Height(km)

0

10

Height(km)

0

100

Distance(km)0 500

0

0816243240485664 Ze (dBZ)

WKR_Z

GPMDPRNS

Zcorr nrsfc

0816243240485664 Ze (dBZ)

-50<T<0°C

-0<T<50°C

BBpeaktotop

BBbottopeak

CourtesyBernat Puigdomènech Treserras,McGillU.

SnowCasesGPMvsWKR

GPMZCorrectedNearSurface WKRZe Difference(GPM– WKR)

OLYMPEX CanadaObjectives

1. Contribute to microphysical studies of precipitation mechanisms over and to the lee of Hurricane Ridge

2. Evaluate GPM products in complex terrain

3. Support model validation and data assimilation in Canada’s operational and developmental NWP models

ECCCOlympexdatasetscollectedSite Dataset Format Status

Univ.ofVictoria

UpperAirSoundings

Uptoevery3-hduringevents2-secresASCIItables

Real-timefeedtoOlympexdataportalRawDigicora .dc3dbfilesalsoavailable

AlbertHead

Surfacestation

1-minrawmessage capture•Parsivel2disdrometer•Pluvio400weighinggauge•WXT520 compactwx station•FD12Ppresentwx system

Real-timefeedtoOlympexdataportalPlotsandcsv time-seriestablesreprocessedanduploaded

AlbertHead

Dual-polX-bandradar

SELEXRainbow5system5-mincycle(3PPIs,5RHIs +Birdbath)Baseparams (level1A):•udBZ,dBZ,V,W,RhoHV,SQI,ZDR,uPHIDPProcessedparams (level1B):•PhiDP FilteredandKDP Derivation•Dual-PolbasedAttenuationCorrection(dBZ,ZDR)

Level1A (1fileperparam)datasetforwardedtoNASA• Currentlyworkingonmulti-param

repackingandfullingestintoODIM_H5format

Rainbowre-ingesttoproducelevel1Bparams TBD

WarmMoistFlowandaNarrowColdFrontalRainband

(11/17/2015)

• HeavyrainoverHurricaneRidge– Warm-sectoruntil21:00– Bright-banddescent(21:00-

22:00)indicatescoldfrontalpassage

Time-height (HTI) cross-section, constructed from 5-min scans over Hurricane Ridge (181º, 41-km)

17:15 UTC

CAX1RHIs

2145UTC1500UTC

-32-20-841628405264

Ze (dBZ)-32-20-841628405264

Vertical profile of Ze at Hurricane Ridge at 1500 UTC(CAX1 black, MRR red)

GPMoverpass• 12/03/2015:GPMcoreobservatorypassedoverOlympicsduringpassage

ofcomplexbaroclinic system

12

GPMDPRNSZcorr nrsfc CAX1Ze

Comparison:A: DBZGPM > DBZCAX1 bright-bandB: DBZGPM < DBZCAX1 ground clutter

HudakDavid,PeterRodriguez,NormanDonaldson,andDanielKirshbaum,2016:OLYMPEXCANADA.17thConferenceonMountainMeteorology,Amer.Meteor.Soc.,paper5.3

GPMXsctn

EnvelopeofCAX1volume

A

B

-32-20-841628405264 -32-20-841628405264

CanadianArcticYearofPolarPrediction (Mid2017tomid2019)

• aperiodofintensiveobserving,modelling,verification,user-engagementandeducationactivities.

Overarchingaim:Improvingweatherandclimateforecastinginthepolarregions,throughabetterunderstandingofkeyphysicalprocessesandanimprovedrepresentationofthoseprocesseswithinnumericalweatherandclimatepredictionsystems.

• ArcticweathersystemsimpactsignificantlythemostpopulatedareasinCanada

• ActivityintheNorthernareasofCanadaisfastgrowing• Relevantandreliableweatherinformationisneededtoprotect

peopleandtheenvironment

IqaluitSupersite(EasternArctic,Coastal)

63.74N68.51W11m

KaBandScanningDual-PolRadar

DopplerLidar(2x)AerosolWaterVapourLidar

RadiometerCeilometerScintillometer +FluxPrecip Testsite

4km

XBandDual-PolDopplerRadar

DopplerPolarizationScanningLidar

WhitehorseSupersite(WesternArctic,ComplexTerrain)

60.71N-135.06W682m

Kaedge KuedgeNadirKaedgeKuedge

Crosstrackslices

GPMoverpassatIqaluit(YFB)2016-07-221301UTC

GPMDPRNSZcorr nrsfc

GPMXsctnsZe (dBZ)

64524028164-8-20-32

YFB

Height(km)

10

0

GPMoverpassatIqaluit(YFB)2016-04-13_1833UTC

SNOWevent Nadir

YFB

Height(km)

10

0

Ka-BandRadaratYFBRHIon134°

Ze

Vr

Page 19 – October 25, 2016

Summary

• Physical validation of DPR L2 products supports many ECCC Strategic Objectives:▪ Assess quality of the GPM measurements in different climate regimes of

Canada▪ Promote the development of hydrological applications making use of

GPM▪ Support model validation and data assimilation in Canada’s operational

and developmental NWP models▪ Supports the development of an integrated observing system that

combines ground based, satellite and airborne observations particularly in the Canadian Arctic (Year of Polar Prediction)

Thank you/Merci

2016PMMScienceTeamMeeting,Houston,TX,October24-28,2016