Articles | Volume 33, issue 5
ANGEO Communicates
29 May 2015
ANGEO Communicates |  | 29 May 2015

A case study of formation and maintenance of a lower stratospheric cirrus cloud over the tropics

M. Sandhya, S. Sridharan, M. Indira Devi, K. Niranjan, and A. Jayaraman

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A rare occurrence of stratospheric cirrus at 18.6km persisting for about 5 days is observed over India from 3 to 7 March 2014. Due to potential vorticity intrusion, large-scale updrafts and increase in humidity are observed at 18.6km. Relative humidity with respect to ice is ~ 150%, indicating that the cirrus cloud may be formed though homogeneous nucleation of sulfuric acid. The persistence of the cirrus cloud is due to the cold anomaly associated with the presence of a 4-day wave.