10.04.2008

KIT – die Kooperation vonForschungszentrum Karlsruhe GmbHund Universität Karlsruhe (TH)

Multi-scale Analysis of the Impact of Soil Moisture on Convective Precipitation

C. Kottmeier, C. Hauck, G. Schädler, N. KalthoffInstitute for Meteorology and Climate Research,

University of Karlsruhe

Renewal proposal KO 924/9-2

1. unique soil moisture network

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Baden-Airpark, 26.07.2007

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2. analysis of high-resolution data sets from the COPS-IOPs

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3. GME/COSMO-DE modelling: influence of soil moisture variability on convective precipitation

precipitation for modified SM

10.04.2008

KIT – die Kooperation vonForschungszentrum Karlsruhe GmbHund Universität Karlsruhe (TH)

• Quantification of the effects of the variability of soil moisture, evapotranspiration and water content in the PBL on convective precipitation processes based on a combined observation/model approach

• observations: soil moisture, soil temperature, energy balance, atmospheric moisture content

• modelling: GME/COSMO-DE; special focus on SVAT formulation

• Identification of the temporal and spatial scales on which such variability influences convective precipitation

• scales: short-term (local impact of soil-atmosphere transport processes) & seasonal scale (soil moisture – precipitation feedback)

General ObjectivesGeneral Objectives::

Aims of the project

10.04.2008

KIT – die Kooperation vonForschungszentrum Karlsruhe GmbHund Universität Karlsruhe (TH)

• Installation soil moisture & soil temperature station network• Soil moisture measurements (will be maintained during the project)• Quality control• Validation & spatial interpolation on COSMO grid

Work Package 1Work Package 1: soil moisture measurement network: soil moisture measurement network

Time schedule & Work Packages

• Selection of case studies, data compilation• Moisture transport in the PBL and energy exchange processes• Comparison with modelled data sets

Work Package 2Work Package 2: : analysis of COPS-IOP’sanalysis of COPS-IOP’s

Time scheduleTime schedule::• Start: 01.07.2006 (PhD student Liane Krauss 01.01.2007)• Soil moisture network: 01.06.2007 – min 01.06.2009; COPS Jun-Aug 2007• if confirmed by DFG: one open position for the modelling part

10.04.2008

KIT – die Kooperation vonForschungszentrum Karlsruhe GmbHund Universität Karlsruhe (TH)

Work Package 3Work Package 3: GME/: GME/COSMO modellingCOSMO modelling• Compilation of soil data• SVAT model analysis• High-resolution analysis of COSMO soil moisture representation• Analysis of model deficiencies• Determination and quantification of QPF improvement

Work Packages & Cooperation

CooperationCooperation::• Surface fluxes and valley convection (Foken, Wirth, Kalthoff)• Contribution of lower and upper tropospheric forcing to the initiation and

inhibition of convection over complex terrain (Barthlott, Kalthoff)• Bundle of proposals to exploit the data of the Convective and

Orographically Induced Precipitation Study (COPS)

10.04.2008

KIT – die Kooperation vonForschungszentrum Karlsruhe GmbHund Universität Karlsruhe (TH)

Installation of soil moisture network

at least 2007 – 2009installed at existing DWD/LUBW stations

10.04.2008

KIT – die Kooperation vonForschungszentrum Karlsruhe GmbHund Universität Karlsruhe (TH)

Stations of the soil moisture monitoring networknumber of stations operating period

COPS specific

sites

COPS Supersites with energy balance station and IMK soil moisture station 3 01.06.07 – 31.08.07

01.06.07 – 01.06.08

COPS Supersites with energy balance station and soil moisture station run by collaborating institutes

2 variable

IMK energy balance station with IMK soil moisture station 7 01.06.07 – 31.08.07

energy balance station and soil moisture stations run by collaborating institutes 4 01.06.07 – 31.08.07

COPS indepen

dent stations

IMK soil moisture stations 41 01.06.07 -

soil moisture stations run by collaborating institutes 3 01.06.07 -

TOTAL 60

Soil moisture measurements

preliminary calibrationpreliminary calibration

[Krauss, Barthlott et al. submitted to Meteorol. Zeitschr.][Krauss, Barthlott et al. submitted to Meteorol. Zeitschr.]

10.04.2008

KIT – die Kooperation vonForschungszentrum Karlsruhe GmbHund Universität Karlsruhe (TH)

Soil moisture measurements

Waghäusel (N)Waghäusel (N)

Simonswald (S)Simonswald (S)

[Krauss et al. submitted][Krauss et al. submitted]

July 2007July 2007

10.04.2008

KIT – die Kooperation vonForschungszentrum Karlsruhe GmbHund Universität Karlsruhe (TH)

Comparison with GME values

10.04.2008

KIT – die Kooperation vonForschungszentrum Karlsruhe GmbHund Universität Karlsruhe (TH)

COSMO-DE case studies

[Krauss et al. submitted][Krauss et al. submitted]

COPS IOP 8bCOPS IOP 8b15.07.0715.07.07

obs – sim (COSMO-DE)obs – sim (COSMO-DE)at 5 cm depthat 5 cm depth

10.04.2008

KIT – die Kooperation vonForschungszentrum Karlsruhe GmbHund Universität Karlsruhe (TH)

Outlook: observations during COPS

COPS IOP 11

• higher latent heat flux and lower sensible heat flux at Baden Airpark due to the larger amount of vegetation and larger evaporation from the soil

• soil moisture at 5 cm depth at Baden Airpark decreased by almost 3 Vol% between 9 am and 5 pm while soil moisture at Hornisgrinde remains unchanged

10.04.2008

KIT – die Kooperation vonForschungszentrum Karlsruhe GmbHund Universität Karlsruhe (TH)

Outlook

• Model simulations with modified soil moisture fields changes in convective precipitation

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• Site specific calibration of sensors• Spatial interpolation/upscaling approaches• COPS-IOP analyses• COSMO-DE simulations with modified soil moisture fields