TRMM Data in Giovanni

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TRMM Data in Giovanni
Zhong Liu George Mason Univ. NASA GSFC DISC
the Giovanni Science Team AMS Giovanni Short
Course January 11th, 2009
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Outline

• TRMM Overview
• TRMM Products in Giovanni
• Giovanni Instance Overview
• Samples
• Summary

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Tropical Rainfall Measuring Mission (TRMM)

• Sampling footprint between 35S and 35N, with
  some composite data (TRMM additional satellite
  or other met data) extending to 50S-50N
• 4-D distribution (3-D time) of rainfall and
  latent heating over vastly under sampled oceanic
  (esp. So. Hem.) and tropical continental regimes

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Why is TRMM so important?

• TRMM is the first satellite mission to establish
  the global distribution of rainfall at the
  Earths surface.
• Instruments
• Precipitation Radar (PR) 247 km swath width x 5
  km instantaneous FOV
• TRMM Microwave Imager (TMI) 878 km x 5.1 km
  FOV, 85.5GHz)
• Visible and InfraRed Scanner (VIRS) 833 km x 2.4
  km FOV

Courtesy of trmm.gsfc.nasa.gov
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TRMM has filled many gaps in our understanding of
the global distribution of rainfall, including

• frequency distributions of rainfall intensity and
  areal coverage
• the partitioning of rainfall into convective and
  stratiform categories
• the vertical distribution of hydrometeors
  (including the structure and intensity of the
  stratiform region bright band) and
• the variation of the timing of heaviest rainfall.

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TRMM Products and Services in Giovanni

• TRMM Near Real-Time (NRT) Rainfall
• TRMM Rainfall Archives
• Corresponding Ground-based Observations of
  Rainfall
• Other non-TRMM Ancillary Data Products

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Near Real-Time (NRT) TRMM Rainfall Datasets

• 3-Hourly Microwave (3B40RT)
• Hourly IR (3B41RT)
• 3-Hourly Combined (3B42RT)
• Daily (derived from 3B42RT)

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• Experimental Real-Time TRMM Multi-Satellite
  Precipitation Analysis (TMPA-RT, 3B42RT)
• Daily Global and Regional Rainfall (TMPA-RT,
  3B42RT derived)
• TMPA-RT Intermediate IR Product (3B41RT, VAR)
• TMPA-RT Intermediate Microwave Product (3B40RT,
  HQ)

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TRMM Rainfall Archives

• 3-Hourly (3B42)
• Daily (derived from 3B42)
• 10-day (derived from 3B42)
• Monthly (3B43, 3A12, 3A25, GPCP, etc.)

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• Monthly Global Precipitation (GPCP)
• Prototype Interactive Intercomparison of Rainfall
  Products
• 3-hourly TRMM and Other Rainfall Estimate (3B42
  V6)
• Daily TRMM and Other Rainfall Estimate (3B42 V6
  derived)
• Monthly TRMM and Other Data Sources Rainfall
  Estimate (3B43 V6)
• Monthly Rainfall (3B43 V6) Anomaly
• Inter-Comparison of Rainfall Climatology
• Monthly TMI Rain, Latent Heat, Cloud Liquid Water
  Profiles (3A12 V6)
• Monthly Rainfall (3A25 V6)

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• Willmott (1950-1999, 0.5 deg)
• GPCC (1986present, 1 deg)
• GPCP (based on GPCC)

Ground-based Rainfall Observation Archives
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Other Ancillary Data Products

• A-Train (CloudSat)
• Aerosols (e.g., MODIS)
• AIRS
• NASA Hurricane Portal (merged IR, QuikSCAT,
  TMI SST, NCEP Reanalysis)
• http//disc.sci.gsfc.nasa.gov/hurricane/

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NEW!
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Two types of GUIs
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Giovanni Analytical Services and Operations
Animation Lat-Lon Area Plot, Time-averaged
Lat-Lon Plot, Difference Map Latitude-Time
Hovmöller Plot Longitude-Time Hovmöller Plot
Correlation Plot Comparison Plot Cross-Map
Plot (Latitude-Height) Cross-Map Plot
(Longitude-Height) Cross-Map Plot (Time-Height)
Scatter Plot Scatter Plot, Time-averaged Time
Series, Area-averaged Time Series Difference
Time Series, Area Statistics
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• Time Series Plots

Alex, Charley, Gaston
Mid- Atlantic Region
Floyd
Isabel
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• 2D Plots (Record-Breaking Rainfall in
• the Mid-Atlantic Region in 2003)

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• 2D Plots (Hurricane Isabel in 2003)

Isabel
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• Hovmöller Diagram (Mid-Atlantic Region)

Multiple Tropical Storms
Isabel
Floyd
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Anomaly (positive anomaly Isabel in Sept. 2003)
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Scatter Plot (Error vs. Rain Rate, revealing
biases)
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ASCII data output for further analysis (MS Excel)
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Summary

• Precipitation products in Giovanni ranging from
  hourly to monthly
• Many functions available for visualization and
  analysis
• Data can be downloaded for further analysis
• More applications will be presented shortly