Head, Meteorological Operations Section, ECMWF David Richardson Head, Meteorological Operations Section, ECMWF david.richardson@ecmwf.int GIFS-TIGGE WG 22-24 February 2010
ECMWF EPS – changes Revised stochastic physics September 2009 (cycle 35r3) Improved T850 probabilities, especially in tropics Resolution increase January 2010 (cycle 36r1) 62 levels, 32km (T639) to day 10, then 65km (T319) to day 15 Initial perturbations (spring 2010): replace evolved SVs with Ensemble of Data Assimilation Better-tuned spread in first 48 hours over the extra-tropics Substantial increase in spread in tropics, improving under- dispersion GIFS-TIGGE WG 22-24 February 2010
Stochastically Perturbed Parametrization Tendencies (SPPT) 09/12/2018 Stochastically Perturbed Parametrization Tendencies (SPPT) Buizza et al 1999 ΔXp= ( 1+rX) ΔXc Revised scheme (35r3) ΔXp= ( 1+μr) ΔXc Random numbers rX constant in 10o by 10o lat/lon boxes, and for 6 model time steps (3h in T399) Random pattern r based on multiple independent AR(1) processes in spectral space, with de-correlation scales 500 km and 6 h Uniform distribution between −0.5 and +0.5 Gaussian distribution with stdev 0.5 (limited to ±3stdev) Independent random numbers rX for X=T, q, u, v Same random number r for X=T, q, u, v Perturbations in entire column No perturbations in lowest 300 m and above 50 hPa (0≤ μ ≤1) Xc unperturbed tendency, Xp perturbed tendency Tapering μ introduced to avoid excessive perturbations amplitudes that are numerically unstable in boundary layer and to avoid large perturbations of mostly radiative tendencies in the stratosphere that are believed to be less uncertain than the net physics tendency in the troposphere. GIFS-TIGGE WG 22-24 February 2010
EPS grid GIFS-TIGGE WG 22-24 February 2010
Registered TIGGE users at ECMWF 687 GIFS-TIGGE WG 22-24 February 2010
Active TIGGE users at ECMWF GIFS-TIGGE WG 22-24 February 2010
Daily TIGGE data archived at ECMWF GIFS-TIGGE WG 22-24 February 2010
TIGGE data retrieved from ECMWF GIFS-TIGGE WG 22-24 February 2010
TIGGE web pages ECMWF will continue to support TIGGE web site Information available on site Archive – how to access, what data is available Data portal (will look at NetCDF for retrieval; some limitations) Model documentation (updates required) Monitoring (of data received and archived) Add monitoring of usage? GIFS-TIGGE WG (documents) Add more background Work done using TIGGE data Papers, presentations (to update) Links to other web sites (to be added) GIFS-TIGGE WG 22-24 February 2010
ECMWF TIGGE web site Static pages (intro, background); edited by ECMWF Dynamic pages (automatic) Monitoring Dynamic pages (editable) News, documentation Can be edited (including adding docs) by users with administration rights GIFS-TIGGE WG 22-24 February 2010