Annual cycle of water vapour in the lower stratosphere over the Indian Peninsula derived from Cryogenic Frost-point Hygrometer observations - Emmanuel, M.; Sunilkumar, S. V.; Muhammed, M.; Suneel Kumar, B.; Neerudu, N.; Ramkumar, G.; Rajeev, K.; Parameswaran, K. (Atmos. Chem. Phys. Discuss., 2018)