Abstract
In November 2012 the University of BASILicata Raman Lidar system (BASIL ) was approved to enter the International Network for the Detection of Atmospheric Composition Change (NDACC). This network includes more than 70 high-quality, remote-sensing research stations for observing and understanding the physical and chemical state of the upper troposphere and stratosphere and for assessing the impact of stratosphere changes on the underlying troposphere and on global climate. As part of this network, more than thirty groundbased Lidars deployed worldwide are routinely operated to monitor atmospheric ozone, temperature, aerosols, water vapour, and polar stratospheric clouds.In the frame of NDACC, BASIL performs measurements on a routine basis each Thursday, typically from local noon to midnight, covering a large portion of the daily cycle. Measurements from BASIL are included in the NDACC database both in terms of water vapour mixing ratio and temperature. This paper illustrates some measurement examples from BASIL, with a specific focus on water vapour measurements, with the goal to try and characterize the system performances.
Highlights
Water vapour is a key atmospheric trace gas controlling weather and climate
The effects of water vapour are large in the upper troposphere and lower stratosphere, but there are few measurements of water vapour concentrations and its long-term variation in this altitude region. Measurements in this altitude region have been traditionally guaranteed by the use of operational radiosondes or balloon-borne frost-point hygrometers, the latter remaining the best source of high quality water vapour measurements in the in the UTLS region[1], but being yet too expensive to be used on operational basis
The Raman Lidar system BASILicata Raman Lidar system (BASIL) joined NDACC in November 2012, with the primary goal of providing accurate routine measurements of the vertical profile of water vapour mixing ratio and temperature, these two parameters being of primary importance for the purposes of NDACC, with valuable contribution to the NDACC primarily expected in terms of water vapour measurements
Summary
Water vapour is a key atmospheric trace gas controlling weather and climate. The effects of water vapour are large in the upper troposphere and lower stratosphere, but there are few measurements of water vapour concentrations and its long-term variation in this altitude region. In the frame of NDACC, BASIL performs measurements on a routine basis each Thursday, typically from local noon to midnight, covering a large portion of the daily cycle.
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