BoM/GNSS RO

ACTIVITIES and PLANS

John Le MarshallDirector, JCSDA 2004-2007CAWCR 2007-2010

John Le Marshall1,2, Yi Xiao1, Robert Norman3, Kefei Zhang3, Anthony Rea4, Lidia

Cucurull5 ,Lars-peter Riishojgaard5 , Rolf Seecamp4, Peter Steinle1, Chris Tingwell1 S. Healy6… and Tan Le1

1CAWCR, Bureau of Meteorology, Australia 2Physics Dept., Latrobe University, Australia3RMIT University, Melbourne, Australia4 Bureau of Meteorology, Melbourne, Australia5 JCSDA, Camp Springs, USA 6 UKMO

John Le MarshallDirector, JCSDA 2004-2007CAWCR 2007-2008

Overview

• The Importance of Satellite Data in the SH

• Recent GNSS/RO Activites

• Data Assimilation – Current and Future

• Current Plans related to GNSS/RO

• Summary

CAWCR

S. Hemisphere 1000 mb AC Z 20S - 80S Waves 1-20

15 Aug - 20 Sep '03

0.5

0.55

0.6

0.65

0.7

0.75

0.8

0.85

0.9

0.95

1

0 1 2 3 4 5 6 7 8

Forecast [days]

An

om

aly

Co

rrel

atio

n

control

no sat

Anomaly correlation for days 0 to 7 for 500 hPa geopotential height in the zonal band 20°-80° for January/February. The red arrow indicates use of satellite data in the forecast model in the Southern Hemisphere has doubled the length of a useful forecast.

GPS/GNSS meteorology in Australia• Ground-based GPS Continuously Operating Reference Station (CORS) network

Australian Regional GPS Network (ARGN) built in 1990s Regional GPSnet built since mid 1990s Recent Australian government initiative (NCRIS) to established gridded CORS

across the country (National Collaborative Research Infrastructure Strategy) Ground based GPS Met. under development for operations

GPS/GNSS meteorology in Australia

• FedSat – Federation Satellite An Australian micro-satellite a small demonstration project - 58 kg microsatellite which

carries experimental equipment for space science research launched in Dec 2002 (NASDA/Japan) , 5yrs lifetime A GPS receiver was onboard

• Recent BoM-RMIT collaboration to look at the issues related to Weather forecasting & climate monitoring e.g.

data assimilation reanalysis

Climate monitoring / Climate prediction (global warming) Ideally in real-time Tropical cyclone hazards Drought/water storage problems in Western Australia,

Drought

Bush Fire

Cyclones

COSMIC GPS/RO

OBSERVNG SYSTEM EXPERIMENTS

BACKGROUND

CAWCR

GPS/COSMIC

24 transmitters

6 receivers3000 occultations/day

[CIMSS- 1992]

Information content from1D-Var studiesIASI (Infrared Atmospheric Sounding Interferometer)

RO (Radio Occultation)

(Collard+Healy, QJRMS,2003)

NWP Suite: Australian Community Climate Earth System Simulator (ACCESS)

Derived from UKMO Unified Model

Global N144 L50 (ACCESS-G)

Period Examined: 26/2/09 26/03/09

Australian Region Data Impact Studies

COSMIC v RADIOSONDE (T)UCAR RO DATA 26/2/09 26/3/09C0=3.0

Lev(km) Mean RMS N 1.00 -0.04207 1.307 175 2.00 -0.3009 1.232 247 3.00 -0.4607 1.115 261 4.00 -0.3354 1.154 268 5.00 -0.2647 1.221 270 6.00 -0.08582 1.237 270 7.00 0.0539 1.201 270 8.00 0.01373 1.29 270 9.00 0.09736 1.208 272 10.00 0.2043 1.02 275 11.00 0.04829 1.144 273 12.00 0.1001 1.09 274 13.00 0.1184 1.034 274 14.00 0.07064 1.112 274 15.00 -0.1134 1.217 268 16.00 -0.1354 1.105 263 17.00 -0.1432 1.32 247 18.00 0.03462 1.349 244 19.00 0.1954 1.295 239 20.00 0.04559 1.223 232 21.00 0.006162 1.234 225 22.00 -0.1707 1.274 203 23.00 -0.2537 1.191 188 24.00 -0.2628 1.191 166 25.00 -0.5534 1.287 131 26.00 -0.2677 1.332 101 27.00 -0.1793 1.367 72 28.00 -0.6021 1.181 49 29.00 -0.3303 1.427 26 30.00 -0.2718 1.399 16

COSMIC v RADIOSONDE26/2/09 26/3/09CO=3.0

FUTUREDevelop an improved forward operator (refractivity) operator

Provide improved error characterization of observations (Examination of bias, ionospheric effects,…..)

Develop improved orbital prediction

Use GPS RO observations to improve absolute accuracy of analyses

Fig.1. Differences in Perigee height.

GNSS PLANSAustralians Space Research Program (ASRP) GPS/RO Proposal

The Bureau is the leader of a consortium which submitted a bid for ASRP funding.

The consortium includes a Canadian satellite manufacturer, a scientific and engineering firm from South Australia, Environment Canada and the Queensland University of Technology.

The bid seeks funding for a Phase A study into the design and launch of an operational GPS-RO mission.

If successful, further funding will be sought from ASRP for manufacture, integration and operation and these future funding rounds will provide opportunities for additional partners including RMIT and UNSW.

Summary• COSMIC data has been successfully assimilated into the

currentACCESS-G system and is about to be tested in the next generation BoM computer (We are currently upgrading our operational computer and NWP forecast suite.)

• Data impact studies with COSMIC data will be used to optimize the Forward Operator (refractivity or bending angle) and assimilation methodology for operations.

• Error characterization of the GPS/RO data and profiles will continue and feedback will be provided as appropriate to UCAR/CDAAC on the quality of the GPS RO data and profiles.

• Bureau of Meteorology led Australian Space Research Program GPS/RO Proposal under consideration by Government Space Policy Unit

Looking Down

Is

Looking Up

TC LAURENCE - Dec. 2009