Control AIRS clear-sky radiances AIRS cloudy retrievals Anomaly - PowerPoint PPT Presentation

Control AIRS clear-sky radiances AIRS cloudy retrievals

Anomaly Correlations computed from 90S to 90N

Anomaly Correlations computed from 90S to 90N

Anomaly Correlations computed from 90S to 90N

Slp RAD analysis (contour) RAD slp impact (shaded) Square: observed Helene position 300 hPa Temp Impact (ret minus Control, shaded) And slp impact (contour) Slp RET analysis (contour) AIRS RET improves position and RETRIEVALS slp impact (shaded) Intensity of Helene

Slp RAD analysis (contour) RAD slp impact (shaded) X: observed Helene position 300 hPa Temp Impact (ret minus Control, shaded) And slp impact (contour) Slp RET analysis (contour) AIRS TIGHT RET produces a PERFECT RETRIEVALS slp impact (shaded) position for Helene

Comparison Of 36-h Forecasts of AIRS TIGHT RET (lower left) with AIRS RAD (upper right) Forecasts from Analysis in which AIRS TIGHT RET are assimilated improve Helene’s Formation as a hurricane (12z 16Sep). Improvement is minimal in RAD case

800 hpa relative humidity, sea level pressure (hPa) RAD CNTRL NCEP Operational Analyses, RETRIEVALS Very poor Display an Eye-like feature

850 hpa relative humidity, sea level pressure (hPa) RAD CNTRL RETRIEVALS NCEP Clear eye-like analyses feature Too broad wrt to obs

OBS CNTRL RAD RET (st) RET (t)

Radiances: very poor structure: Retrievals: Realistic 2-band Two unconnected convective systems structure comparing well with without a deep circulation satellite Retrievals Much Radiances higher Very weak (100%) System, low Vorticity Vorticity

OBS CNTRL AIRS RAD AIRS RET

OBS CNTRL RAD AIRS ret AIRS tight ret

SHANSHAN HELENE Even in cases in which AIRS brings no improvement in precipitation analysis and forecast (typhoon Shanshan, 2006) and generally in very strong, mature and large tropical systems, the assimilation of AIRs retrievals improves the precipitation WILMA probability distribution function. THIS HAS PROMINENT IMPLICATIONS FOR FLOOD FORECASTING