Aryabhatta Research Institute Of Observational Sciences (ARIES)

Consider the following statements:

1. A recent study conducted by Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, has shown that water vapour exhibits a positive radiative effect at the top of the atmosphere, suggesting an increase in overall warming in the high altitude Himalayas due to it.
2. Aerosol-cloud-precipitation interactions over this region, which are one of the most climate-sensitive regions, are poorly understood, apparently, due to a lack of proper observational data.
3. Precipitable Water Vapour (PWV) is one of the most rapidly varying components in the atmosphere and is mainly accumulated in the upper troposphere.

Which of the above statement(s) is/are true?