Payerne station operations

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Presentation transcript:

Payerne station operations 2018 NDACC LWG Meeting G. Martucci1, L. Renaud1 and A. Haefele1,2 1 Office Fédérale de Météorologie et Climatologie, MeteoSuisse, Payerne, Suisse 2 Department of Physics and Astronomy, The University of Western Ontario, London, Canada

Remote Sensing group at Payerne LWG NDACC-devoted Remote sensing group leader T,q,AOD Raman LIDAR + sunphotometer Radiation measurement Aerosol hygroscopicity (LIDAR+radiometer) E-PROFILE Windprofiler+ceilometers Ice cloud formation LIDAR+radiosounding Ozone measurements O3 radiometer EUMETNET/EUNADICS Widprofiler+ceilometer

The RAman Lidar for Meteorological Observations - RALMO Laser Nd:YAG 450 mJ @ 355 nm Operated in Payerne, Switzerland Since 2008 Fully automatic Raman lidar Day and nighttime operation Narrow FOV and bandwidth High laser-pulse energy, 450 mJ

Automatic Operations 24/7 Weekly Monthly 6 Monthly Yearly Cleaning Flash lamp exchange after 40 M shots Litron maintenance Air conditioning Raw data archiving telescopes alignment Cooling system Energy measurement (before beam expander) Energy measurement (after beam expander) Cleaning of telescopes Change in 2018: Litron LPY7000 Nd:YAG laser systems Wavelength 355 nm Rep. Frequency 30 Hz Energy @355 nm 450 mJ Pumping flashlamps Operational yes

RALMO data availability last 4 points Q1-Q4 2017.

2017 PRR Temperature statistics RAL vs SRS-C50 -0.25 K

2017 Water Vapor statistics RAL vs SRS-C50 For UTLS validation RS92/RS41 need to be used Δω≈|10%|

Hygroscopicity Hygroscopic growth: Particle size and chemical composition change as function of RH due to water uptake It affects the scattering of the radiation (direct effect) and the cloud microphysics (indirect effect) Hygroscopicity is different for each aerosol type 𝑓𝑋 𝑅𝐻 = 𝑋𝜆(𝑅𝐻) 𝑋𝜆 𝑅𝐻𝑟𝑒𝑓 Enhancement factor:

Hygroscopicity LIDAR measurements of backscatter and RH Homogeneous aerosol layer with enhanced RH Air mass origin is the same at all altitudes. Well mixed layer, i.e. constant profiles of potential temperature (θ) and water vapor mixing ratio (r)

RALMO operations/activities of interest to NDACC in 2017 Continuous real-time measurements, every 30 minutes, of H2O, T Clear-sky nighttime integrated offline measurements of H2O and T New RH real-time measurements troposphere and UTLS Trip to TMF to validate RALMO H2O profiles with GLASS and LidarRun_Client. On-going publications to be submitted summer/fall 2018: PRR Temperature validation since FastCOM OEM PRR Temperature climatology (MeteoSwiss + Western) OEM H2O (MeteoSwiss + Western) 2018: create the HDF matlab routine based on WV template and submit 2008-2018 data to the NDACC server