Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 3.248 IF 3.248
  • IF 5-year value: 3.650 IF 5-year 3.650
  • CiteScore value: 3.37 CiteScore 3.37
  • SNIP value: 1.253 SNIP 1.253
  • SJR value: 1.869 SJR 1.869
  • IPP value: 3.29 IPP 3.29
  • h5-index value: 47 h5-index 47
  • Scimago H index value: 60 Scimago H index 60
Volume 10, issue 11 | Copyright
Atmos. Meas. Tech., 10, 4303-4316, 2017
https://doi.org/10.5194/amt-10-4303-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Nov 2017

Research article | 10 Nov 2017

Profiling water vapor mixing ratios in Finland by means of a Raman lidar, a satellite and a model

Maria Filioglou1, Anna Nikandrova2, Sami Niemelä3, Holger Baars4, Tero Mielonen1, Ari Leskinen1,5, David Brus3, Sami Romakkaniemi1, Elina Giannakaki1,6, and Mika Komppula1 Maria Filioglou et al.
  • 1Finnish Meteorological Institute, Atmospheric Research Centre of Eastern Finland, Kuopio, Finland
  • 2Department of Physics, University of Helsinki, Helsinki, Finland
  • 3Finnish Meteorological Institute, Helsinki, Finland
  • 4Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germany
  • 5Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
  • 6Department of Environmental Physics and Meteorology, University of Athens, Athens, Greece

Abstract. We present tropospheric water vapor profiles measured with a Raman lidar during three field campaigns held in Finland. Co-located radio soundings are available throughout the period for the calibration of the lidar signals. We investigate the possibility of calibrating the lidar water vapor profiles in the absence of co-existing on-site soundings using water vapor profiles from the combined Advanced InfraRed Sounder (AIRS) and the Advanced Microwave Sounding Unit (AMSU) satellite product; the Aire Limitée Adaptation dynamique Développement INternational and High Resolution Limited Area Model (ALADIN/HIRLAM) numerical weather prediction (NWP) system, and the nearest radio sounding station located 100km away from the lidar site (only for the permanent location of the lidar). The uncertainties of the calibration factor derived from the soundings, the satellite and the model data are < 2.8, 7.4 and 3.9%, respectively. We also include water vapor mixing ratio intercomparisons between the radio soundings and the various instruments/model for the period of the campaigns. A good agreement is observed for all comparisons with relative errors that do not exceed 50% up to 8km altitude in most cases. A 4-year seasonal analysis of vertical water vapor is also presented for the Kuopio site in Finland. During winter months, the air in Kuopio is dry (1.15±0.40g kg−1); during summer it is wet (5.54±1.02g kg−1); and at other times, the air is in an intermediate state. These are averaged values over the lowest 2km in the atmosphere. Above that height a quick decrease in water vapor mixing ratios is observed, except during summer months where favorable atmospheric conditions enable higher mixing ratio values at higher altitudes. Lastly, the seasonal change in disagreement between the lidar and the model has been studied. The analysis showed that, on average, the model underestimates water vapor mixing ratios at high altitudes during spring and summer.

Publications Copernicus
Download
Citation
Share