Data assimilation of Mode-S MRAR over Slovenia. Benedikt Strajnar
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1 Data assimilation of Mode-S MRAR over Slovenia Benedikt Strajnar 1
2 Outline Types of Mode-S data Preprocessing Impact experiments Conclusions 2
3 Mode-S system Primary radars (a pulse is reflected back by the aircraft, enabling its position to be computed) Secondary radars (a transponder on board the aircraft transmits its identity, as well as the aircraft s altitude) Mode-S: selective communication between airframe and ground station (possibility to transmit data) 3
4 Types of Mode-S met. data name data MODE-S MRAR Meteorological routine air report (BDS 4,4) met. routine air report wind speed, direction, temperature turbulence, humidity (BDS 4,5) met. hazard report (turbulence, wind shear,microburst,icing) MODE-S EHS Enhanced surveilance (reports) (BDS 4,0) selected vertical intent ( selected altitude) (BDS 5,0) track and turn report - roll angle, true track angle and rate, ground speed and true air speed (BDS 6,0) heading and speed report indicated air speed and mach, barometric altitude rate, magnetic heading type Direct data Indirect (temperature) data rep. by around 5 % of all Mode-S equipped aircraft (depends on transponder configuration) all Mode-S equipped aircraft Strajnar 2012, Hrastovec and Solina 2013 de Hann 2011, de Haan and Stoffelen
5 Example data set 5
6 Preprocessing and quality control Temporal smoothing (12s / 60 s) Whitelist approach Generated from comparison of Mode-S with operational NWP over a period of 22 months Airplanes with high mean or sd with respect to model flagged Coding to OBSOUL format from ATC Raw CSV Filtered SCV Smoothed CSV OBSOUL Merged OBSOUL data assimilation 6
7 Statistics per aircraft type 7
8 Quality evaluation Warm temperature bias 8
9 OMG statistics - mean 9
10 Winter vertical profiles 10
11 Winter - scores 11
12 Severe freezing rain case end of January
13 Severe freezing rain case Without Mode-S With Mode-S Freezing rain 13
14 Summer front With Mode-S Without Mode-S Radar 14
15 Summer front (wind) 600 hpa wind EXP Increment With Mode-S Difference between analyses 15 REF Increment Without Mode-S Difference between first guesses
16 Summer scores 16
17 PBL biasses Biases observed in station in the Ljubljana basin - Mode-S experiment systematically drier and warmer. 17
18 Humidity analysis Multivariate links in B-matrix between humidity and other variables Switched off 18
19 Univariate humidity impact 19
20 Conclusions Mode-S MRAR are (on average) and after quality-control very good observations Clear impact on nowcasting to short range forecasts even with data from a single radar Shows challenges with respect to humidity analysis 20
21 Plans EUMETNET proposal New term: Aircraft-Derived Data (ADD) Mode-S EHS; MRAR ADS-B,ADS-C internet Expert group gathered information and experience about current ADD activities (KNMI, Met Office, ARSO, ) Proposal for additional 1 year activity: To collect information on availability and data policy of ADD over Europe Propose dissemination strategy Propose a new EUMETNET observation project (besides or together with AMDAR) 21
22 Plans LACE Data availability: ARSO: Mode-S MRAR CHMI: Mode-S EHS;MRAR Austria (upgrade postponed to next year) Any other information? Data policy to be discussed Preprocessing (could be done at ARSO or OMZS?) Collection and sharing within OPLACE (till EUMETNET activity) Cooperate / exchange data with KNMI 22
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