1. A first look to PABLS-13 IOPs 27-28N: cold advection + dawn surface inversion 29-30N: evening inversion + windy late night J. Cuxart UIB (Dpt. of Physics, Mallorca) PABLS-13 Workshop ELTE, Budapest 3-4 April 2014

2. 1. IOP1 meteorological situation 2. IOP1 available data: ground and profiles 3. IOP1 potentiality: cold adv. with clouds + clear morning inversion 4. A short glimpse on IOP2: evening inversion + windy late night 5. Conclusions and outlook Appendix: Multicopter performance (B. Wrenger)

3. 1. The meteorological situation 28N, 0129 27N, 120028N, 0900 27N, 1200

4. 850 hPa Geop, T 10m wind T min 925 hPa wind 28N, 0Z Psup, rh 700

5. Profiles: 1. Tethered balloon soundings for T, RH up to 250 m all night 2. Multicopter soundings up to 100 m 3. Sodar profiles up to 400 m 4. Complete operational sounding at 00Z 5. Magyar UAV flights (evening and early morning) 6. Wind profiler and radiometer T profiler Surface: a. ELTE surface station b. OMSZ operational data c. UIB suplementary data

6. UIB portable station

7. Operational OMSZ Sounding

8. 4. Profiles 4.1 Low level Profiling: Tethered balloon

9. Hövmoller plots (balloon -left- and multicopter -right-)

10. Hövmoller plots Sodar (wind direction and speed)10m WD 10m WS

11. Early morning profiles UAV-magyar

12. Air-soil interface UIB station

13. Surface Energy Budget (ELTE. BUTE)

14. IOP2:clear, calm first, windy later

15. 29N, 20 UTC30N, 01 UTC Psup, HR700 analysis 28N, 0Z

16. Captive balloon T, RH profiles

17. Conclusions and outlook 1. Two potentially interesting situations are under study, despite the difficult conditions in the field 2. IOP1 displays two consecutive regimes (nocturnal cold advection and morning surface inversion) with a substantial amount of experimental information 3. IOP2 is almost inverse: a radiative inversion first part of the night and a windy weakly stable regime in the second part of the night. Much less data available (few balloon profiles, no UAV-magyar, no multicopter) 4. Other more stable cases seem to exist in the database and may be explored with sodar and radiometer data, but with less detail close to the surface. 5. If more campaigning is to follow, it would be necessary to have a little mast of 10 or 20 m high to sample the surface layer thermodynamic structure 6. The Szeged airport has shown its potential for ABL studies during PABLS13

18. HS OWL Multicopter Activities ● Multicopter RPAS with sensors for T, T_Surface and RH ● 2013/11/27-28: 18 vertical profile flights in total, altitude 100 m agl. 15 flights provided data. ● RPAS was operated in automatic take off and landing mode most of the time. ● Fast thermocouple sensor adjusted to the teethered balloon data. ● RH sensor contaminated or non- calibrated, could not be recovered during the POI. ● T_Surf data not yet analysed. Probably of minor relevance.

19. Multicopter: Lessons Learned ● Upper limit of vertical profile can be extended without risk (even at low temperatures). ● RPAS should allow a replacement of the sensors during the campaign. ● Horizontal survey patterns using T_Surf sensor might provide additional insight. ● Wind sensor should be provided for the next campaign.