Projects under development

• Assimilation of – precipitation, soil moisture & GPS radio-

occultations ( Funding from GRIP Canadian Space Agency)

• Assimilation of – ground-based GPS Zenith Tropospheric Delay– AIRS radiances/clear sky– SSM/I radiances/clear sky

• Assimilation system for GEM-strato (top of model moved from 10 to 0.1 hPa)

Meteorological Service of CanadaEnvironment Canada

Assimilation of Precipitation

• Assimilate rain information over the oceans• Emphasis on tropical and extra-tropical cyclones

– Brightness Temperature 1D-Var (SSM/I, TRMM-TMI)– Surface Rain Rate1D-Var (SSM/I, TRMM-TMI/PR) – Develop a strategy to assimilate rain information:

Either a 1D-Var (analyzed IWV) + 4D-Var or

Direct 3D-Var assimilation

• Kain-Fritsch, CLOUST (TJ 2003), RTTOVSCATT• Background from GEM-mesoglobal (58 levels, top

at 10 hPa, 0.45ox 0.3o grid, 12h forecast)

GRIP (Government Related Initiatives Program)Canadian Space Agency (CSA)

Temperature increments (K) Specific Humidity increments (gkg-1)

SRR SRR SRR

SRR

TROPICAL CYCLONE ZOE (2002 12 27 0000 UTC): T and Q Inc.Assimilation of F15 SSM/I Tb

Assimilation of Atmospheric Refractivity from GPS Radio-Occultations

• 2 Satellites operating: CHAMP, SAC-C• Average 200 occultations/day (50 refractivity measures/profile)• Occultations assimilated with CMC operational 3D-Var• Experiment to be performed for Jan 2004• Data is refractivity vs. geometric height.

– Bending angle vs. impact parameter is under development• Measurements below 5 km black-listed (retrieval algorithms not

sufficiently reliable yet).• First Results from CHAMP/SAC-C tests expected by September

2004. • Then prepare for COSMIC data (3000 occu.’s/day). Simulated data.

Launch late 2005.

GRIP (Government Related Initiatives Program)Canadian Space Agency

CHAMP+SAC-C Refractivity 3D-Var Assimilation

2004 01 06 0000 UTC (±3h)

OBS-ForecastOBS-Forecast & & OBS-AnalysisOBS-Analysis: mean & : mean & ±±11σσ

Assimilation of soil moisture

• Develop CALDAS: provide initial state for NWP model-off-line land surface process model ISBA (Noilhan

et al.)

-assimilate Tb (1.4-19 GHz) + IR Tskin

-2D-Var and/or Kalman filter • Preparation for ESSP HYDROS (L-band active and

passive) (2010 launch)-soil moisture & freeze/thaw state

GRIP (Government Related Initiatives Program)Canadian Space Agency

Assimilation of Ground-based GPS ZTD & GPS met Surface Pressure

• 1) Collocation study on Integrated Water Vapor: radiosondes, ground-based GPS and analyses/6h trials from GEM global (28 levels, 0.9o).

• 2) Impact of Assimilating ZTD & Ps Obs. on Q: 1D-Var with synthetic background and obs

• 3) Future work: Assimilation in regional model. Work in progress.

Ground-Based GPS IWV collocation study7 months: April, June, July, August, October 2001 & January 2002112 sites: Final GPS zenith tropospheric delay estimation (7 AC) (final orbit product)16 sites: GPS met Ps 66 sites: Have collocated radiosondes

IGS data set (3-way comparison)

RELATIVE ERROR (%)

ABSOLUTE ERROR (mm)

RS

RS

TRIAL (6h)

TRIAL

GPS

GPS

Assimilation of ZTD & Ps Observations: 1D-Var with synthetic background and obs

•Impact of assimilating Ps & ZTD on analyzed Q:

-Slightly higher error reduction due to correlation of model Ps and Q errors.

-Assimilation of Ps observations results in more accurate analyzed Ps

Error Reduction in Q: Control & PS 100

200

300

400

500

600

700

800

900

1000

-5 0 5 10 15 20 25 30 35 40 45 50

ER (%)

Pre

ssu

re (

hP

a)

Very Dry

Very Dry PS

Average

Average PS

Moist

Moist PS

ZTD obs error= 12 mm

HYPERSPECTRAL INFRARED (AIRS)

• 281 channel set received via internet• RTTOV-7 radiative transfer model• Current work on cloud mask, cloud top determination, pixel selection, monitoring, bias correction, visualization tools• Choice of channels still open, but to begin with: - channels insensitive above model top at 10hPa - channels insensitive to surface over land - expected initial number of the order of 80-100• Current personal: 1 PhD, 1 MSc (GRIP CSA), +1 Post-doc in fall• Assimilation cycles to begin fall 2004• First operational implementation by mid 2005, in 4D-var system

GEM-Strato (model top extended from 10 to 0.1 hPa)

• Improve forecast in the stratosphere• Assimilate channels with non-zero weighting function

above 10 hPa (AMSU-A 11-14 + more weight on AMSU-A 9-10 + AIRS/IASI)

• Future data assimilation of stratospheric ozone• Hybrid vertical coordinate Laprise and Girard (1990),

80 vertical levels, top at 0.1 hPa• 3D-Var Analysis levels same as GEM-strato• Moisture analysis up to 70 hPa (was 300 hPa)• Analyses/fcsts improved in the lower stratosphere

- above 100 hPa much better than GEM-operational

Jan/Feb 2002: Operational & GEM-Strato —Verification vs raobs NH

GZ

T

UV

T-Td

ASSIMILATION OF SSM/I TB/CLEAR SKY F13,F14,F15 July 2003INTEGRATED WATER VAPOR

ASSIMILATION OF SSM/I TB/CLEAR SKY F13,F14,F15

• SSM/I Tb ready for parallel runs Oct 2004