Federal Department of Home Affairs FDHA Federal Office of Meteorology and Climatology MeteoSwiss VERSUS: Requirements for TEMPs and windprofilers Francis Schubiger & Christophe Hug MeteoSwiss VERSUS meeting Langen (D), 4 March 2010

2 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) Requirements for TEMPs verification (1) Verification: for all 12h (wind alone also for all 6h) starting at +0h at surface and on the following p-levels: from 1000 to 850 hPa: for each 25 hPa from 850 to 100 hPa for each 50 hPa 70, 50 and 30 hPa wind direction only for wind speed > 3m/s MeteoSwiss can provide fortran-code for vertical interpolation onto p-levels and onto z-levels (subroutines inside fieldextra)

3 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) TEMPS verification Payerne: Summer 2009 wind speed: forecasts + 24h COSMO-7 COSMO-2 biasStandard deviation

4 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) Requirements for TEMPs verification (2) Strategy at MeteoSwiss: Verification with OBS and MOD in „l2b-format“ OBS: BUFR -> l2b MOD: GRIB -> l2e Suggested strategy for VERSUS: OBS: read BUFR directly in VERSUS and vertical interpolation for all verification p-levels MOD: read GRIB (all model levels of U,V,QV,QC,T,P needed) with fieldextra and produce an output („l2b- format or eventually pseudo-BUFR) with profiles at all TEMP-gridpoints for all verification p-levels

5 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) L2e-format

6 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) l2e-format H model gp v-profile M * E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E H model gp v-profile

7 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) Requirements for windprofiler verification (1) windprofilers (WP) run in two modes, in Switzerland: high mode: data from ~200m to ~8000 m above ground, for all 144m low mode: data from ~100m to ~2500 m above ground, for all 72m verification for all 30‘ (full hours and half hours) with the WP-data (temporal means of 30‘) at full hours +15‘ and +45‘ (WP at full hour +15‘ contains the data of the last 30‘) Verification on the following z-levels: high mode: on WP-levels or model-levels low mode: on WP-levels or model-levels

8 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) CN-MET upper air network assimilated in COSMO-2 Kleindöttingen (KDT) Aug.-Okt. ‘08 Mühleberg (ZES) May-June ‘09 Windprofiler locations in Switerland Project CN-MET

9 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) Requirements for windprofiler verification (2) Strategy at MeteoSwiss: Verification with MATLAB (experimental mode) OBS: BUFR -> conversion to z-levels (within MATLAB) MOD: GRIB -> l2b profiles for all model-levels -> interpolation to z-levels (within MATLAB) Suggested strategy for VERSUS: OBS: read BUFR directly in VERSUS and conversion/vertical interpolation for all verification z-levels, subtract 15‘ to the sounding time for comparison with MOD MOD: read GRIB (all model levels of U,V,W needed) with fieldextra and produce an output („l2b-format or eventually pseudo-BUFR) with profiles at all WP-gridpoints for all verification z-levels

10 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) KDT – High-mode wind direction High-mode Wind direction ff ≥ 3 m/s High-mode Wind direction ff ≥ 3 m/s

11 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) ZES – High-mode wind speed

12 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) KDT – Low-mode wind speed

13 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) Bias Wind direction ff ≥ 3 m/s Comparison radio sonde Payerne: Bias Radiosonde PayerneProfiler Payerne Profiler Kleindöttingen 0-5°

14 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) Comparison radio sonde Payerne: Standard deviation 10-15° 20-30° Radiosonde PayerneProfiler Payerne Profiler Kleindöttingen Bias Wind direction ff ≥ 3 m/s

15 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) PAY – High mode wind direction High-mode Wind speed ff ≥ 3 m/s High-mode Wind speed ff ≥ 3 m/s

16 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) PAY – High-mode wind speed

17 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) PAY – Validation with Radiosounding Wind direction ff ≥ 3 m/s Wind direction ff ≥ 3 m/s

18 VERSUS: Requirements for TEMPs and windprofilers VERSUS meeting, , Langen (D) PAY – Validation with radiosounding