Estimation of the mixing layer height over a high altitude site in Central Himalayan region by using Doppler lidar

Improvement of vertical velocity statistics measured by a Doppler lidar through comparison with sonic anemometer observations

“…These measurements have been used in many studies (e.g. Hogan et al, 2009;Lothon et al, 2009;Barlow et al, 2011;Shukla et al, 2014). For this measurement, the DL simply points at zenith and continually collects measurements of the vertical velocity w, for which w 2 , spectra of w, and other turbulence statistics of w can be calculated at every range gate over a user-defined time interval.…”

Doppler Lidar Observations over a High Altitude Mountainous Site Manora Peak in the Central Himalayan Region

“…We varied the SNR from -15 dB to -25 dB and found the -20 dB to be an appropriate threshold for all scans. Therefore, we applied a threshold of -20 dB for all types of scans (FTP, RHI and PPI) of the DL which can considerably reduce the noise level 12,21,22 .…”

“…We have estimated the inversion or mixing layer height by using vertical velocity variance data of DL on 2 December 2011 (Figure 6 e). To estimate the inversion or mixing layer height from the DL signal, we have used the wavelet-covariance transform (WCT) method and detailed description about the WCT can be found elsewhere 22 . The dilation is used 150 m for the 2 December 2011 in WCT.…”

Avaliação do ciclo anual da Camada Limite Planetária na região Amazônica (Study of the annual cycle of the planetary boundary layer in the Amazon region)

“…Os Ceilometers são instrumentos de sensoriamento remoto do tipo LIDAR, que registram a intensidade do retroespalhamento óptico no infravermelho próximo, por meio da emissão de um pulso de luz na vertical, sendo executado de forma autônoma. E assim, se obtêm a base das nuvens e, por meio desta é estimada à altura da CLP (Shukla et al, 2014). Por se tratar de um instrumento de alta-frequência, possuindo uma taxa amostral da altura da CLP a cada 16 segundos, este é uma ferramenta poderosa para rastreamento da altura da CLP ao longo do seu ciclo diário.…”