Overview of WG3a activitiesOverview of WG3a activitiesUpper air physical aspectsUpper air physical aspects

Federico Grazzini, ARPA Emilia-RomagnaServizio Idro Meteo Clima (SIMC)

Scientists working in Physical Aspects - Upper air (WG3a)----------------------------------------------------------Renata Pelosini ARPA-PiedmontFrancesca di Giuseppe ARPA-SIMC Federico Grazzini ARPA-SIMC Paola Mercogliano CIRA Ulrich Blahak DWD Ekaterina Machulskaya DWD Dmitrii Mironov DWD Matthias Raschendorfer DWD Bodo Ritter DWD Jan-Peter Schulz DWD Axel Seifert DWD Euripides Avgoustoglou HNMS Witek Interewicz IMGW Liliana Velea NMA Tiziano Maestri University of Bologna Ronaldo Rizzi University of Bologna Matteo Caggio Univ. of Ferrara

Scientists working in Physical Aspects - Soil and surface (WG3b)----------------------------------------------------------------Giovanni Bonafe ARPA-SIMC Massimo Milelli ARPA-PiedmontJuergen.Helmert DWD Ekaterina Machulskaya DWDDmitrii Mironov DWD Bodo Ritter DWD Jan-Peter Schulz DWD DWDMartin Lange DWD Claudia Heret DWD Gerd Vogel DWD Edouard Davin ETHZ Grzegorz Duniec IMGW Jean-Marie Bettems MeteoSwiss Reto Reto Stoeckli MeteoSwiss Ekaterina Kazakova Roshydromet Inna Inna Rozinkina Roshydromet

Alla Yurova Roshydromet

By decision of the STC (April 2011) the former WG3 has split:

wg coordinatorJean-Marie Bettems

wg coordinatorFederico Grazzini

WG3a activities

Boundary layer Boundary layer MicrophysicsMicrophysics Radiation Radiation Deep convection and grid scale precipitationDeep convection and grid scale precipitation

DiagnosticDiagnostic

Subject Institution(contact person)

Planned duration Brief Description

Reorganization and maintenance of the turbulence scheme

DWDM. Raschendorfer

Ongoing Introducing the concept of scale separation and interaction terms accounting from other sub-grid scale phenomena in the TKE equation. Interactions terms (shear, SSO wake) have already been formulated and tested. This year efforts are concentrated on interaction term from convection

Modification of the surface-layer transfer parameterisations, including the reformulation and tuning of the laminar-layer resistance

DWDM. Raschendorfer

Not yet started. Initially planned for 2011

The primary aim is to improve the scheme performance in stable stratification.

Microphysics and precipitation parametrizations

Axel Seifert, Uli BlahakDWD

Planned implementation 2011

New microphysics schemes of different complexity have been developed for the COSMO model (2 moments, adding concentration of raindrops to the actual Graupel-Scheme. New melting scheme is still under development, and has to potential to improve forecasts of precipitation phase and snow density.

Verification of COSMO models with wind profiler

Paola Mercogliano

CIRA

Validation of COSMO LM 7 and 2.8 km using wind profiler data for some test cases; in particular during

temperature inversion and strong wind events.

WG3a workplan 2010-2011

Proposed implementation of new schemes deriving from past WG3 activities (to be discussed at SMC)

single column model Raschendorfer (DWD)

2012

saturation adjustment Blahak and Seifert (DWD)

Q4 2011 ?

microphysics: two moment microphysics Seifert(DWD Q4 2011

microphysics: melting snow Frick and Seifert (DWD)

Q4 2012

radiation: orographic correction Buzzi (MeteoSwiss) Q1 2012

clean up turbulence scheme options Raschendorfer (DWD)

?

use of monthly aerosol climatology Helmert (DWD) ?

….ongoing problems and future activities

Too strong outgoing surface heat fluxes during night, lack of low level clouds and excessive mixing in strongly stratified conditions.

2m Temperature diurnal cycle problem, with a warm bias of minimum temperature over low-land and stable conditions

PBL issuesPBL issues

Problems Research• TKE scale separation and interaction terms. Increase interaction and exchange of kinetic energy from of other sub-grid scale phenomena and resolved termo-dynamics with the turbulence scheme (scale interaction terms). M.Raschendorfer, DWD

• Subscale treatment of surface heterogeneity. It seems absolutely necessary to couple a tiled surface scheme with the PBL turbulence in order to improve the turbulence scheme performance in the stably stratified PBL. D. Mironov, DWD

• Revision of the surface transfer scheme. M.Raschendorfer, DWD

• There are indications (Schulz 2011) that the ground heat flux in the TERRA multi layer scheme is systematically overestimated. This has been detected by observations made at Lindenberg and SP Capofiume. It is shown that the soil model can be improved with a new formulation of the soil thermal conductivity (in conjunction with WG3b).

Courtesy of J.P. Schulz and G. Vogel

Courtesy of J.P. Schulz and G. Vogel

Results of BaseAlfa obs campaign Results of BaseAlfa obs campaign

A typical day with inversion: OBSA typical day with inversion: OBS

A typical day with inversion: FC+24A typical day with inversion: FC+24

A typical day with inversion: ANALYSISA typical day with inversion: ANALYSIS

COSMO-EU: Overestimation of precipitation during winterUnderestimation of precipitation during summerDiurnal cycle of convection is wrong, i.e. maximum too early.Sometimes unrealistic local overestimation of precipitation

COSMO-DE:Underestimation of deep convection, non sufficient interaction between deep convective systems (seen also in -I2 configuration)

Convection and precipitation issuesConvection and precipitation issues

Problems Research

• Testing of 1-Km scale runs. Meteoswiss and ARPA-SIMC are running some test and exploring the feasibility of running at very high resolution. Potential benefits are envisaged although a re-tuning of some parametrization might be required. G. De Morsier (Meteoswiss, A. Morgillo ARPA-SIMC)

• A comparison of spectral characteristics of COSMO I2 total precip and RADAR estimated precip, has highlighted some differences in the scale of the invariance law. In particular the model spectra is more flat indicating a general inability of separating large-scale precip from convection (…lack of organisation in convection ??). V. Pavan ARPA-SIMC

RTE contains severe approximations and limitations mostly due to computing time restrictions.The most critical issue in this context originates from the need to integrate solutions of the RTE over all energetically relevant wavelengths

RADIATIONRADIATION

Problems Research

• Monte Carlo Spectral Integration. Bodo Ritter, DWD

• Adaptive scheme. It combines accurate and fast parametrization making use of spatial and temporal correlation in the atmosphere. V. Venema, DWD Extramural research

Atmosphere – Ocean interactionAtmosphere – Ocean interaction

Problems Research Wind generated waves influence the atmosphere and determine the fluxes from the ocean to the atmosphere. At the moment there is no direct effect on the roughness, the model doesn’t feel the waves.

Waves are driving currents and currents are modulating the waves. This interaction is also not included.

Parameters that controls the laminar exchanges over sea are not optimally tuned.

Work has been done to couple

COSMO (Atmosphere) , WAM (Waves) and ROMS (Currents) models. Preliminary results are encouraging (coupling atm and wam). Some comparison with observed fluxes over marine bounday layer are needed for further tuning. CNMCA could invest some human resources with some help from PBL expert. (L. Torrisi CNMCA, in collaboration with A. Roland-ISMAR and V. Romaniello-INGV)