1 / 6

Plans for Near-Real-Time AIRS L2 Profile Assimilation

Plans for Near-Real-Time AIRS L2 Profile Assimilation. Shih-Hung Chou and Brad Zavodsky. AIRS Specifications. Aboard Aqua polar orbiter Early afternoon equator crossing 2378 spectral channels 3.7 – 15.4 μ m (650 – 2675 cm -1 ) 3 x 3 footprints (50 km spatial resolution)

radwan
Download Presentation

Plans for Near-Real-Time AIRS L2 Profile Assimilation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Plans for Near-Real-Time AIRS L2 Profile Assimilation Shih-Hung Chou and Brad Zavodsky

  2. AIRS Specifications • Aboard Aqua polar orbiter • Early afternoon equator crossing • 2378 spectral channels • 3.7 – 15.4 μm (650 – 2675 cm-1) • 3 x 3 footprints (50 km spatial resolution) • AMSU allows for retrievals in both clear and cloudy scenes • Version 4.0 Error Estimates (Tobin et al. 2006) • 0.6-1.0K over ocean (± 50o latitude) • 0.9-1.3K global ocean and land (in 1 km layers) • < 15% RH (in 2 km layers)

  3. AIRS Data Quality Indicators • Quality indicators (QIs) in V5: • pressure for each sounding indicating level of valid data • level-by-level error estimates for each T and q profile • Improved retrieval algorithm • More data are assimilated • QIs allow for the maximum amount of quality data to be assimilated • assimilating a larger volume of higher quality data should produce an analysis that provides better initial conditions for the WRF AIRS V5 PBest from JPL Focus Day

  4. Near-Real-Time WRF/AIRS SimulationsInitialized at 00Z – 12 km (Using15 nodes) wrf_prep 40-km NAM (00Z) wrf_real init/brdy wrf_run to AIRS time 7-h fcst Assimilate AIRS data (ARPS) 15 min 8 min 30 min ~1.5 h AIRS data wrf_run (autopost) 41-h fcst Products to web 2 h 10 m/case 30 min • Summary: • Total run time with 1 AIRS case: ~ 4 h 40 m • Each additional case ~ 2 h 10 m • QPF and RAOB verifications will run when obs are available

  5. Timeline for Near-Real-Time WRF/AIRS SimulationsInitialized at 00Z – 12 km (Using15 nodes) 5:20Z 6:20Z 9:00Z 10:30Z 12:40Z 14:50Z 15:20Z WRF WRF Start WRF CNTL run AIRS run-1 AIRS run-2 Web products 7-h fcst 7-h fcst ADAS 7:00Z AIRS obs AIRS on line

  6. Products to Web Daily Posting • Surface and Pressure-Level Maps: T, q, h, and V • Difference Fields: T, q, h, and V Delayed Posting • Verification Statistics: RAOB and NAM analysis bias and RMSE • Qualitative Precipitation Forecast: Stage IV precipitation bias score and equitable threat score Website:NASA GHCC AIRS Assimilation Case Study

More Related