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

Journal metrics

IF value: 3.668
IF3.668
IF 5-year value: 3.707
IF 5-year
3.707
CiteScore value: 6.3
CiteScore
6.3
SNIP value: 1.383
SNIP1.383
IPP value: 3.75
IPP3.75
SJR value: 1.525
SJR1.525
Scimago H <br class='widget-line-break'>index value: 77
Scimago H
index
77
h5-index value: 49
h5-index49
Preprints
https://doi.org/10.5194/amt-2017-355
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2017-355
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

  11 Dec 2017

11 Dec 2017

Status
This preprint has been retracted.

Optical and Geometrical Properties of Cirrus Clouds over the Tibetan Plateau Measured by Lidar and Radiosonde Sounding at the Summertime in 2014

Guangyao Dai1,2, Songhua Wu1,3, Xiaoquan Song1,3, and Liping Liu4 Guangyao Dai et al.
  • 1Ocean Remote Sensing Institute , Ocean University of China, Qingdao, 266100, China
  • 2Leibniz Institute for Tropospheric Research, Leipzig, 04318, Germany
  • 3Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China
  • 4Laboratory of Severe Weather, Chines e Aca demy of Meteorological Science, Beijing, 100081, China

Abstract. Optical and geometrical characteristics of cirrus clouds over Naqu (31.48° N,92.06° E), the Tibetan Plateau were determined from lidar and radiosonde measurements performed during the third TIbetan Plateau EXperiment of atmospheric sciences (TIPEX III) campaign from July to August 2014. For the analysis of the temperature dependence, the simultaneous observations by lidar and radiosonde were conducted. Cirrus clouds were generally observed ranging from 9.7 to 16.5 km above sea level (a.s.l.), with the cirrus middle temperatures in the range from −79.7 to −26.0 °C. The cloud thickness generally differed from 0.12 to 2.55 km with a mean thickness of 1.22 ± 0.70 km and 85.7 % of the case studies had thickness smaller than 1.5 km. The retrievals of linear particle depolarization ratio, extinction coefficient and optical depth of cirrus clouds were performed. Moreover, the multiple scattering effect inside of cirrus cloud was corrected. The linear particle depolarization ratio of the cirrus clouds varied from 0.36 to 0.52, with a mean value of 0.44 ± 0.037. The optical depth of all the cirrus clouds was between 0.01 and 3 following the scheme of Fernald-Klett method. Sub-visual, thin and opaque cirrus clouds were observed at 9.52 %, 57.14 % and 33.34 % of the measured cases, respectively. The temperature and thickness dependencies on optical properties were studied in detail. A maximum cirrus thickness of around 2 km was found at temperatures between −60 and −50 °C. This study shows that the cirrus mean extinction coefficient of the cirrus clouds increase with the increase of temperature. However, our measurements indicate that the linear particle depolarization ratio has the opposite change tendency along with temperature. The relationships between the presence of cirrus clouds and the temperature anomaly and deep convective activity are also discussed. The formation of cirrus clouds is also investigated and it has apparent relationship with the dynamic processes of Rossby wave and deep convective activity over the Tibetan Plateau. The cloud radiative forcing is calculated by Fu-Liou model and increases monotonously with the increase of optical depth.

This preprint has been retracted.

Guangyao Dai et al.

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Guangyao Dai et al.

Guangyao Dai et al.

Viewed

Total article views: 775 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
510 244 21 775 22 31
  • HTML: 510
  • PDF: 244
  • XML: 21
  • Total: 775
  • BibTeX: 22
  • EndNote: 31
Views and downloads (calculated since 11 Dec 2017)
Cumulative views and downloads (calculated since 11 Dec 2017)

Viewed (geographical distribution)

Total article views: 722 (including HTML, PDF, and XML) Thereof 716 with geography defined and 6 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 05 Dec 2020
Publications Copernicus
Download
Retraction notice

This preprint has been retracted.

Short summary
Optical and geometrical characteristics of cirrus clouds over the Tibetan Plateau were determined with lidar measurements which were performed during the third Tibetan Plateau experiment of atmospheric sciences campaign from July to August 2014. Simultaneous observations with radiosonde were conducted to analyze the temperature dependence of these characteristics. The relationships between the presence of cirrus clouds and the temperature anomaly and deep convective activity are also discussed.
Optical and geometrical characteristics of cirrus clouds over the Tibetan Plateau were...
Citation