Improvement of calibration capabilities with an a posteriori evaluation of the lighting impulse international comparison EURAMET.EM-S42

By the evaluation of the EURAMET.EM-S42 intercomparison results, the Laboratorio Alte Tensioni e Forti Correnti (LATFC) of Istituto Nazionale di Ricerca Metrologica (INRiM, Italy NMI) starts an analysis of the calibration capabilities with the developed measuring system for lightning impulse voltages. This paper addresses the issue of the expanded uncertainty re-evaluation for the INRiM’s CMCs up to 200 kV according to a new analysis of the comparison reference value (CRV), without affecting the results of the other participants in the comparison for all the involved lighting impulse parameters. A validation of the new uncertainty values has been performed by means the calculation, for some test data waveforms extract for reference standard IEC 61083 - 2, of the convolution with the measured divider step response

Improvement of calibration capabilities with an a posteriori evaluation of the lighting impulse international comparison EURAMET.EM-S42

By the evaluation of the EURAMET.EM-S42 intercomparison results, the Laboratorio Alte Tensioni e Forti Correnti (LATFC) of Istituto Nazionale di Ricerca Metrologica (INRiM, Italy NMI) starts an analysis of the calibration capabilities with the developed measuring system for lightning impulse voltages. This paper addresses the issue of the expanded uncertainty re-evaluation for the INRiM’s CMCs up to 200 kV according to a new analysis of the comparison reference value (CRV), without affecting the results of the other participants in the comparison for all the involved lighting impulse parameters. A validation of the new uncertainty values has been performed by means the calculation, for some test data waveforms extract for reference standard IEC 61083 - 2, of the convolution with the measured divider step response

Significant variations of trace gas composition and aerosol properties at Mt. Cimone during air mass transport from North Africa – contributions from wildfire emissions and mineral dust

Abstract. High levels of trace gas (O3 and CO) and aerosol (BC, fine and coarse particle volumes), as well as high scattering coefficient (σp) values, were recorded at the regional GAW-WMO station of Mt. Cimone (CMN, 2165 m a.s.l., Italy) during the period 26–30 August 2007. Analysis of air-mass circulation, aerosol chemical characterization and trace gas and aerosol enhancement ratios (ERs), showed that high O3 and aerosol levels were likely linked to (i) the transport of anthropogenic pollution from northern Italy, and (ii) the advection of air masses rich in mineral dust and biomass burning (BB) products from North Africa. In particular, during the advection of air masses from North Africa, the CO and aerosol levels (CO: 175 ppbv, BC: 1015 ng/m3, fine particle volume: 3.00 μm3 cm−3, σp: 84.5 Mm−1) were even higher than during the pollution event (CO: 138 ppbv, BC: 733 ng/m3, fine particles volume: 1.58 μm3 cm−3, σp: 44.9 M