Carpe diem
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CARPE DIEM. 5th meeting. Dublin, December 2003. Bernat Codina, Miquel Picanyol Dept. of Astronomy and Meteorology University of Barcelona. WP 3: Data assimilation. Contribution to WP3 (Data Assimilation): Experiment comparison between the IAU and nudging methods.

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CARPE DIEM

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Carpe diem

CARPE DIEM

5th meeting. Dublin, December 2003.

Bernat Codina, Miquel Picanyol

Dept. of Astronomy and Meteorology

University of Barcelona


Wp 3 data assimilation

WP 3: Data assimilation

  • Contribution to WP3 (Data Assimilation):

  • Experiment comparison between the IAU and nudging methods.

  • Assess the impact on the precipitation field.


Wp 3 data assimilation1

WP 3: Data assimilation

  • Description of the experiment:

  • Corrections on the T,u,v,q and ps variables are introduced via IAU and nudging methods.

  • Assimilation frequency: 6 and 3 hours.

  • 10 different cases.


Wp 3 data assimilation2

WP 3: Data assimilation

Methodology:

“Perfect OBS”

First guess

+

Observations

First guess

IAU/Nudging

First guess

Control


Wp 3 data assimilation3

WP 3: Data assimilation

Surface temperature


Wp 3 data assimilation4

WP 3: Data assimilation

U 850hPa


Wp 3 data assimilation5

WP 3: Data assimilation

Sfc – 500hPa RH


Wp 3 data assimilation6

ME = 4.1

ME = 4.2

ME = 1.2

RMSE = 14.1

RMSE = 17.7

RMSE = 17.9

ME = -0.8

RMSE = 14.9

ME = -0.7

RMSE = 12.6

WP 3: Data assimilation

Total precipitation


Wp 3 data assimilation7

ME = 0.8

ME = 1.1

ME = -0.2

RMSE = 9.3

RMSE = 6.9

RMSE = 16.8

ME = -0.04

RMSE = 12.4

ME = 0.2

RMSE = 7.1

WP 3: Data assimilation

Total precipitation


Wp 3 data assimilation8

ME = 6.0

ME = 6.6

ME = -0.2

RMSE = 23.4

RMSE = 19.4

RMSE = 23.8

ME = 0.2

RMSE = 22.9

ME = 0.5

RMSE = 19.0

WP 3: Data assimilation

Total precipitation


Wp 3 data assimilation9

WP 3: Data assimilation

Total precipitation mean error


Wp 3 data assimilation10

WP 3: Data assimilation

Total precipitation RMSE


Wp 3 data assimilation11

WP 3: Data assimilation

  • Conclusions:

  • Best results in 3-hour frequency assimilation.

  • IAU tends to overestimate precipitation.

  • 3-hour nudging assimilation minimizes the total precipitation RMSE.

  • Verification of precipitation:

    • RMSE severely penalizes mislocation errors.

    • Other verification methods could be applied. [Ebert & McBride, 2000]


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