Status of soil moisture production at DWD Interim ELDAS Data coordination meeting Martin Lange, Bodo Ritter, Reinhold Schrodin

Outline Overview - status of work Input data –Physiografic data, Eldas Forcing Presentation of assimilation system –Atmospheric model system –SMA Issues on output –Mars archiving Summary and outlook –Timeline 2 nd ELDAS progress meeting, Madrid 2003

Soil moisture production Assimilation- system Mars retrieval INPUT OUTPUT Eldas Forcing Physio- grafic data GME / LM Terra-ml SMA-ml Validation at Alterra Storage into MARS ELDAS at DWD 2 nd ELDAS progress meeting, Madrid 2003

Soil moisture production INPUT Physio- grafic data ELDAS at DWD 2 nd ELDAS progress meeting, Madrid 2003

Improvement of model bowen ratio with LAI from ecoclimap database 2 nd ELDAS progress meeting, Madrid 2003

Soil moisture production INPUT ELDAS at DWD 2 nd ELDAS progress meeting, Madrid 2003 Eldas Forcing

Running the model with Eldas forcing 2 nd ELDAS progress meeting, Madrid 2003

Soil moisture production ELDAS at DWD 2 nd ELDAS progress meeting, Madrid 2003 Mars retrieval INPUT

Grid interpolation works 2 nd ELDAS progress meeting, Madrid 2003 May 27, 2000

Soil moisture production ELDAS at DWD 2 nd ELDAS progress meeting, Madrid 2003 Assimilation- system GME / LM

DWD Assimilation system 2 nd ELDAS progress meeting, Madrid 2003

Soil moisture production ELDAS at DWD 2 nd ELDAS progress meeting, Madrid 2003 Assimilation- system Terra-ML

Terra-ML needs SMA to reduce bias in T2m 2 nd ELDAS progress meeting, Madrid 2003

Soil moisture production ELDAS at DWD 2 nd ELDAS progress meeting, Madrid 2003 Assimilation- system SMA-ml

Adapt 2-layer SMA to multilayer model t 0 = 0:00 t ht / +15 h 24 h routine forecast 2 additional 15 h forecasts  j ‘ =  j +  running SMA for t=t0 2 nd ELDAS progress meeting, Madrid 2003 SMA is started every daily cycle at 0:00 UTC analysis time. –Soil moisture at the previous day is adjusted to reduce forecast error of screen level temperature during day time. –The variational procedure requires an additional 15 hour forecast for every soil layer. –Due to computational costs this can not be done for 5 or more layers in an operational system. –Therefore different layers in the multilayer system are combined to two layers and the SMA is performed for these two layers. –Finally moisture increments are redistributed to the multilayer system

T2m sensitive to soil moisture in layer 3-5 (3-81cm) 2 nd ELDAS progress meeting, Madrid 2003

Functionality of multilayer SMA Two main qualitative criteria –Positive soil moisture increments for positive temperature bias (i.e. T 2m (fc) -T 2m (obs) > 0) –Strong impact for clear sky conditions, no impact in cloud covered regions 2 nd ELDAS progress meeting, Madrid 2003

It works... 2 nd ELDAS progress meeting, Madrid 2003 wb(ana-routine), upper layers (mm)wb(ana-routine), lower layers (mm) T2m(fc-ana) (K)Swnet (W/m 2 ) May, 1 st 2000, initial state

Soil moisture production ELDAS at DWD 2 nd ELDAS progress meeting, Madrid 2003 OUTPUT Validation at Alterra

Submission to Alterra 6 day validation test period: –Extracted from DWD archive, results are presented in validation appetizer by Cor Jacobs and Eddy Moors. 2 month validation period: –Results submitted, storage into MARS still to be done Full 15 month period: –Further preparation of assimilation system. 2 nd ELDAS progress meeting, Madrid 2003

Model setup for soil moisture production 2 nd ELDAS progress meeting, Madrid 2003

Soil moisture production ELDAS at DWD 2 nd ELDAS progress meeting, Madrid 2003 OUTPUT Storage into MARS

Mars archiving Output parameter list is defined Interpolation works (as shown for input) To prepare –Implement data transfer line –Adapt grib output from interpolated fields to MARS requirements –Submit test data from 2 monthly experiment 2 nd ELDAS progress meeting, Madrid 2003

Benefits from Eldas, scientific impact RhoneAgg –Validation and improvement of physics from multilayer model –Availability of validation data based on numerous models Validation at Alterra –Improvement of model Bowen ratio with LAI from ecoclimap –Improving soil moisture state –Availability of validation data based on measurements Running multilayer scheme in assimilation system –Adaptation of multilayer scheme for operational use –Adaptation and implementation of soil moisture analysis for multilayer scheme 2 nd ELDAS progress meeting, Madrid 2003

Contribution to RhoneAgg SMA scheme First test data for implementation of validation procedure Optimize soil moisture state for a full operational forecast system Benefits Eldas-(community) 2 nd ELDAS progress meeting, Madrid 2003

Time schedule 2 nd ELDAS progress meeting, Madrid 2003