Abstract
We present the first, to the best of our knowledge, measurements from a new lidar facility that was designed and built at the University of Hertforshire since 2012. LITES (Lidar Innovations for Technologies and Environmental Sciences) allows testing, developing, and measuring of a multitude of climate-change relevant parameters of atmospheric particulate pollution and photochemically reactive trace gases. The core of LITES consists of a lidar spectroscopy instrument. In this first contribution, for example, we present the design and specifications of this instrument, its performance, and potential applications. First, we show examples of the measurements of range-resolved pure rotational Raman spectra and rotational-vibrational Raman spectra of air molecules with a spectral resolution better than 5cm-1. We also present day-time temperature profiles obtained from pure rotational spectroscopic lidar signals. In future work, we aim to explore the potential of our multi-channel high-resolution spectrometric lidar to obtain vertically resolved chemical characterization of aerosols and trace gases.
Highlights
Lidar is the method of choice for measuring atmospheric state parameters, photochemically reactive trace gases and particulate pollution on a vertically highly resolved scale [1,2]
The combination of various lidar techniques with mathematical inversion algorithms today allows for temporally and vertically resolved observations of aerosol optical and microphysical properties on a routine basis [5,6]. This approach of using Raman lidar and an inversion algorithm for particle characterization is limited to nighttime observations because of the weak intensity of Raman signals in the visible wavelength range (VIS)
Pure rotational Raman (PRR) lidar allows for independent measurements of profiles of aerosol extinction and backscatter coefficients [11]
Summary
Nd:YAG, injection seeded 8000 mJ at 1064 nm 5000 mJ at 532 nm 2500 mJ at 355 nm 0.5 mrad 10 Hz
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