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
Discussion papers
https://doi.org/10.5194/amt-2018-342
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2018-342
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 20 Nov 2018

Research article | 20 Nov 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Planetary Boundary Layer variability over New Delhi, India, during EUCAARI project

Konstantina Nakoudi1,2, Elina Giannakaki1,3, Aggeliki Dandou1, Maria Tombrou1, and Mika Komppula3 Konstantina Nakoudi et al.
  • 1Department of Environmental Physics and Meteorology, Faculty of Physics, University of Athens, Greece
  • 2Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
  • 3Fininish Meteorological Institute, Kuopio, Finland

Abstract. Ground-based lidar measurements were performed at Gual Pahari measurement station, approximately 20km South of New Delhi, India, from March 2008 to March 2009. The height of the Planetary Boundary Layer (PBL) was retrieved with a portable Raman lidar system, utilizing the modified Wavelet Covariance Transform (WCT) method. The lidar derived PBL heights were compared to radiosonde data, Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) satellite observations and two atmospheric models. The results were also analyzed on a seasonal basis. To examine the difficulties of PBL lidar detection under different meteorological and aerosol load conditions we focused on three case studies of PBL diurnal evolution. In the presence of a multiple aerosol layer structure, the WCT method exhibited high efficiency in PBL height determination. Good agreement with the European Center for Medium-range Weather Forecasts (ECMWF) and the Weather Research and Forecasting (WRF) estimations was found (r=0.69 and r=0.74, respectively) for a cumulus convection case. In the aforementioned cases, temperature, relative humidity and potential temperature radiosonde profiles were well compared to the respective WRF profiles. The Bulk Richardson Number scheme, which was applied to radiosonde profile data, was in good agreement with lidar data, especially during daytime (r=0.68). The overall comparison with CALIPSO satellite observations; namely, CALIOP Level 2 Aerosol Layer Product, was very satisfying (r=0.84), with CALIPSO Feature Detection Algorithms slightly overestimating PBL height. Lidar measurements revealed that the maximum PBL height was reached approximately three hours after the solar noon, whilst the daily evolution of the PBL was completed, on average, one hour earlier. The PBL diurnal cycle was also analyzed using ECMWF estimations, which produced a stronger cycle during the winter and pre-monsoon period. The seasonal analysis of lidar PBL heights yielded a less pronounced PBL cycle than the one expected from long term climate records. The lowest mean daytime PBL height (695m) appeared in winter, while the highest mean daytime PBL height (1326m) was found in the monsoon season as expected. PBL daily growth rates exhibited also a weak seasonal variability.

Konstantina Nakoudi et al.
Interactive discussion
Status: open (until 15 Jan 2019)
Status: open (until 15 Jan 2019)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement
Konstantina Nakoudi et al.
Konstantina Nakoudi et al.
Viewed  
Total article views: 249 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
204 39 6 249 4 2
  • HTML: 204
  • PDF: 39
  • XML: 6
  • Total: 249
  • BibTeX: 4
  • EndNote: 2
Views and downloads (calculated since 20 Nov 2018)
Cumulative views and downloads (calculated since 20 Nov 2018)
Viewed (geographical distribution)  
Total article views: 237 (including HTML, PDF, and XML) Thereof 235 with geography defined and 2 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited  
Saved  
No saved metrics found.
Discussed  
No discussed metrics found.
Latest update: 18 Dec 2018
Publications Copernicus
Download
Citation
Share