ECMWF/EuroTRMM Workshop on the Assimilation of Clouds and Precipitation

The ECMWF/EuroTRMM Workshop on the Assimilation of Clouds and Precipitation was held from 6 to 9 November 2000.


The first four dimensional variational (4D-Var) data assimilation system was put in operations at ECMWF on November, 25 1997. Two days later (27-11-1997), the Tropical Rainfall Measuring Mission (TRMM) satellite was successfully launched from the Tanegashima Space Center (Japan). These two important events of the atmospheric science have opened up a new era for satellite measurements (TRMM being the first mission with space borne rain radar) and for their use in numerical weather prediction (4D-Var being more efficient that previous analysis systems for the assimilation of satellite data).

The workshop was jointly organized by ECMWF and the coordinators of EuroTRMM. The proceedings contain a description of the key results obtained by the various European laboratories involved in this 3-year collaboration. They also include recent developments performed outside ECMWF on the assimilation of rainfall rates. Even though less mature that the assimilation of precipitation, the interest for cloud assimilation is growing in the scientific community by the advent of new satellite explorer missions with active instruments (radar/lidar). Several presentations were devoted to explore this area of research. The task of the four working groups was to identify the observational data sets that could be used for data assimilation, the necessary developments in terms of physical parametrization scheme and retrieval methods, and the improvements required to data assimilation systems for a better usage of cloud and precipitation data.


PDF iconIntroduction and working group reports


Validation of the TRMM PR rain retrieval algorithm from airborne and ground-based radar data

P Amayenc

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PR adjusted TMI estimation of rainfall

P Bauer

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Requirements for the assimilation of cloud radiances

F Chevallier

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Variational assimilation of precipitation data and gravity wave adjustment

L Fillion

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Validation of cloud fraction and overlap using radar and lidar observations

R J Hogan

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Lessons from TRMM and plans for GPM

A Y Hou

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The evaluation of cloud parametrization in GCMs - are we doing the best we can?

C Jakob

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Linearized physics for the assimilation of cloud properties

M Janisková

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Sea surface scattering under rainy conditions

D Lemaire

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4D-Var assimilation of TMI rainfall rates

V Marécal

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Assimilation of precipitation in the Met Office mesoscale model

B McPherson

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Cloud-model based Bayesian techniques for precipitation profile retrieval from TRMM microwave sensors

A Mugnai

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Validation of a convection scheme using TRMM data

A Rhodin

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Validation of cloudiness in gcms using Meteosat observations

R Roca

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Precipitation analysis based on gauge measurements

B Rudolf

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Estimation of surface latent heat flux from TRMM

J Schulz

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Cloud assimilation in the era of CLOUDSAT

G Stephens

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Rain characteristics in tropical regions: measurements from radars and ground-based instruments

J Tan

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Field experiments in support of EuroTRMM

J Testud

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Modelling microwave scattering in the melting layer

C J Walden

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Local information

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