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CHG rainfall products. Make best possible rainfall products for monitoring crop stress in areas of rain fed agriculture. Objectives:. CHG rainfall products. Make best possible rainfall products for monitoring crop stress in areas of rain fed agriculture. Objectives:. Results:.

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chg rainfall products

CHG rainfall products

Make best possible rainfall products for monitoring crop stress in areas of rain fed agriculture.

Objectives:

chg rainfall products1

CHG rainfall products

Make best possible rainfall products for monitoring crop stress in areas of rain fed agriculture.

Objectives:

Results:

CHIRP (1981 - present) and FTIP (2000 - present)

Global unbiased 0.05 degree pentads

available with 2 day lag

tinyurl.com/chg-products

chg rainfall products2

CHG rainfall products

Make best possible rainfall products for monitoring crop stress in areas of rain fed agriculture.

Objectives:

Results:

CHIRP (1981 - present) and FTIP (2000 - present)

Global unbiased 0.05 degree pentads

available with 2 day lag

tinyurl.com/chg-products

Improved

Results:

CHIRP/FTIP blended with station data, 1 pentad lag

quick overview of how we get there
Quick overview of how we get there…
  • Start with long term monthly average rainfall maps FCLIM
  • Aside: build monthly models of rainfall trained on TRMM-V7
    • derive coefficients a and b, such that rain rate = a * CCD + b (IRP)
    • where CCD is the percentage of observation where IR temp < threshold
  • Calculate IRP pentads from CPC IR data (2000 - present) and B1 IR data (1981 - 2008)
  • CHIRP (1981-present) = FCLIM * (IRP %normal)
  • Use TRMM-RT7 data (2000 - present)
  • FTIP (2000-present) = FCLIM * (IRP %normal + TRMM-RT7 %normal)/2
  • SPACE TIME
chirp 2012 09 6

CHIRP 2012.09.6

0.05º, global, unbiased, rainfall pentad [mm] with 2 day lag.

ftip 2012 09 6

FTIP 2012.09.6

0.05º, global, unbiased, rainfall pentad [mm] with 2 day lag.

fclim derived wet season
FCLIM derived wet season

JFM FMA MAM AMJ MJJ JJA JAS ASO SON OND NDJ DJF

validation analysis
Validation analysis

Season time series (2001 – 2011)

JFM [J1+F1, J1+M1, F1+M1, …, J11+F11, J11+M11, F11+M11]

. . .

JAS [J1+A1, J1+S1, A1+S1, …, J11+A11, J11+S11, A11+S11]

. . .

NDJ [N1+D1, N1+J2, D1+J2, …, N11+D11, N11+nan, D11+nan]

  • for each data set to validate, CHIRP, FTIP, TRMM, ECMWF…
  • build cubes of 2 month totals based on growing season.

time series

time series

FTIP

‘True’

latitude

latitude

longitude

longitude

correlation

bias ratio

mean absolute error

misses

correlation with interpolated stations

TRMM-RT7 ECMWF

Correlation with interpolated stations

CHIRP FTIP

-0.5 0.0 0.5 0.7 1.0

bias ratio to interpolated stations

TRMM-RT7 ECMWF

Bias ratio to interpolated stations

CHIRP FTIP

0.0 0.5 0.8 1.2 1.5 >1.5

chg station climate database
CHG Station Climate Database
  • Daily rainfall observations from many public and private sources going back to the 1800’s
  • Currently ~950,000 records in db
  • Used to create spatially interpolated fields
  • Challenge identifying duplicates, non-zero zeroes
  • Constantly topping off db from available sources
  • Blended into satellite rainfall products
summary
Summary
  • 2 rainfall products, CHIRP (1981-present) & FTIP (2000-present)
  • Global, 0.05º, unbiased, pentads with 2 day lag.
  • Compare very well with existing rainfall products.
  • Developing an extensive station rainfall database
  • Used to blend station data with CHIRP and FTIP
thank you
Thank You …
  • Chris Funk
  • Greg Husak
  • Joel Michaelsen
  • Diego Pedreros
  • Andrew Verdin
  • Marty Landsfeld
  • Boleslo Romero
  • FEWS NET
  • Data available via anonymous ftp: tinyurl.com/chg-products
chg rainfall product paths
CHG Rainfall Product Paths

CHG Stations database

FCLIMS, 1920 present, 5Km, 5days

FCLIM

FTIPS

2005-prst,

5Km, 5days

FTIP

CHIRPS

1980-present, 5Km, 5days

CHIRP

IRP

2000-prnt

Join 80-prst

BIRP

1980-2008

CCD model

some data issues
Some data issues.
  • B1 glitches
  • Station zeroes not zero
how to make fat clims
How to make FAT clims

CHIRP clim 09.6

pentad,

pixel,

= 2176 points/year

p-3 p-2 p-1 p p+1 p+2 p+3

fclim derived wet season1
FCLIM derived wet season

JFM FMA MAM AMJ MJJ JJA JAS ASO SON OND NDJ DJF

validation africa correlations

CMORPH CPC-Unified PERSIANN

Validation - Africa correlations

TRMM-V6 TRMM-V7 TRMM-RT7

CHIRP FTIP-V7 FTIP-RT7

validation correlations red

CMORPH ECMWF

Validation - Correlations red

TRMM-RT7 FTIP-RT7

-1.0 0.0 0.5 0.7 1.0

validation correlations 2 red

PERSIANN TRMM-V6

Validation - Correlations 2 red

TRMM-V7 CHIRP-V7

-1.0 0.0 0.5 0.7 1.0

validation correlations 2 blue

PERSIANN TRMM-V6

Validation - Correlations 2 blue

TRMM-V7 CHIRP-V7

-1.0 0.0 0.5 0.7 1.0

validation mean absolute error 2

PERSIANN TRMM-V6

Validation - Mean Absolute Error 2

TRMM-V7 CHIRP-V7

0 40 60 100 >100

validation bias ratio 2

PERSIANN TRMM-V6

Validation - Bias ratio 2

TRMM-V7 CHIRP-V7

0.0 0.5 0.8 1.2 1.5 >1.5

validation misses 2

PERSIANN TRMM-V6

Validation - Misses 2

TRMM-V7 CHIRP-V7

0 1 4 9 >9

correlation with interpolated stations1

TRMM-RT7 ECMWF

Correlation with interpolated stations

CHIRP FTIP

-1.0 0.0 0.5 0.7 1.0

bias ratio to interpolated stations1

TRMM-RT7 ECMWF

Bias ratio to interpolated stations

CHIRP FTIP

0.0 0.5 0.8 1.2 1.5 >1.5

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