Research Papers

Investigations on the physical and optical properties of cirrus clouds and their relationship with ice nuclei concentration using LIDAR at Gadanki, India (13.5°N, 79.2°E)

[+] Author Affiliations
Vasudevannair Krishnakumar

University of Kerala, Department of Optoelectronics, Kariavattom, Trivandrum-695 581, Kerala, India

Malladi Satyanarayana

University of Kerala, Department of Optoelectronics, Kariavattom, Trivandrum-695 581, Kerala, India

Soman R. Radhakrishnan

University of Kerala, Department of Optoelectronics, Kariavattom, Trivandrum-695 581, Kerala, India

Reji K. Dhaman

University of Kerala, Department of Optoelectronics, Kariavattom, Trivandrum-695 581, Kerala, India

Vellara P. Mahadevan Pillai

University of Kerala, Department of Optoelectronics, Kariavattom, Trivandrum-695 581, Kerala, India

Karnam Raghunath

National Atmospheric Research Laboratory, Gadanki, Tirupati-517 502, India

Madineni Venkat Ratnam

National Atmospheric Research Laboratory, Gadanki, Tirupati-517 502, India

Duggirala Ramakrishna Rao

Geetanjali College of Engineering and Technology, Cheeryal, Keesara, Hyderabad-501301, Andhra Pradesh, India

Pindlodi Sudhakar

Geetanjali College of Engineering and Technology, Cheeryal, Keesara, Hyderabad-501301, Andhra Pradesh, India

J. Appl. Remote Sens. 5(1), 053567 (November 28, 2011). doi:10.1117/1.3662877
History: Received May 12, 2011; Revised October 28, 2011; Accepted November 01, 2011; Published November 28, 2011; Online November 28, 2011
Text Size: A A A

Cirrus cloud measurements over the tropics are receiving much attention recently due to their role in the Earth's radiation budget. The interaction of water vapor and aerosols plays a major role in phase formation of cirrus clouds. Many factors control the ice supersaturation and microphysical properties in cirrus clouds and, as such, investigations on these properties of cirrus clouds are critical for proper understanding and simulating the climate. In this paper we report on the evolution, microphysical, and optical properties of cirrus clouds using the Mie LIDAR operation at the National Atmospheric Research Laboratory, Gadanki, India (13.5°N, 79.2°E), an inland tropical station. The occurrence statistics, height, optical depth, depolarization ratio of the cirrus clouds, and their relationship with ice nuclei concentration were investigated over 29 days of observation during the year 2002. Cirrus clouds with a base altitude as low as 8.4 km are observed during the month of January and clouds with a maximum top height of 17.1 km are observed during the month of May. The cirrus has a mean thickness of 2 km during the period of study. The LIDAR ratio varies from 30 to 36 sr during the summer days of observation and 25 to 31 sr during the winter days of observation. Depolarization values range from 0.1 to 0.58 during the period of observation. The ice nuclei concentration has been calculated using the De Motts equation. It is observed that during the monsoon months of June, July, and August, there appears to be an increase in the ice nuclei number concentration. From the depolarization data an attempt is made to derive the ice crystal orientation and their structure of the cirrus. Crystal structures such as thin plates, thick plates, regular hexagons, and hexagonal columns are observed in the study. From the observed crystal structure and ice nuclei concentration, the possible nucleation mechanism is suggested.

Figures in this Article
© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Vasudevannair Krishnakumar ; Malladi Satyanarayana ; Soman R. Radhakrishnan ; Reji K. Dhaman ; Vellara P. Mahadevan Pillai, et al.
"Investigations on the physical and optical properties of cirrus clouds and their relationship with ice nuclei concentration using LIDAR at Gadanki, India (13.5°N, 79.2°E)", J. Appl. Remote Sens. 5(1), 053567 (November 28, 2011). ; http://dx.doi.org/10.1117/1.3662877


Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

Topic Collections

PubMed Articles
Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.