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Presence of Water Vapour Leading to Increase in Warming Across the High Altitude Himalayas, Shows Study | The Weather Channel – Articles from The Weather Channel

Presence of Water Vapour Leading to Increase in Warming Across the High Altitude Himalayas, Shows Study | The Weather Channel – Articles from The Weather Channel

Posted on February 15, 2022 By Sharika Soukup
File photo: The Himalayas.(Sajal Mukherjee/BCCL Delhi)

File photo: The Himalayas.

(Sajal Mukherjee/BCCL Delhi)

Water vapour exhibits a positive radiative effect at the top of the atmosphere (TOA), suggesting an increase in overall warming in the high-altitude Himalayas due to it, a study has shown.

Precipitable water vapour (PWV) is one of the most rapidly varying components in the atmosphere and is mainly accumulated in the lower troposphere. Due to the large variability in space and time, mixing processes and contribution to a series of heterogeneous chemical reactions, and sparse measurement networks, especially in the Himalayan region, it isn’t easy to accurately quantify the climatic impact of PWV over space and time.

Moreover, aerosol-cloud-precipitation interactions over this region, which are one of the most climatic-sensitive, are poorly understood, apparently, due to a lack of accurate observational data, a release from the Ministry of Science and Technology said on Thursday.

However, the recent research led by Dr Umesh Chandra Dumka from Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, an autonomous research institute of the Department of Science and Technology, has shown that PWV exhibits a positive radiative effect at the top of the atmosphere in remote high-altitude locations in the order of about 10 watts per square metre at Nainital (altitude 2,200 metres, in central Himalaya) and 7.4 W per square metre at Hanle (Altitude 4,500 metres, in western Trans Himalaya).

Team members from the National Observatory of Athens (NOA), Tohoku University, Japan; Indian Institute of Astrophysics (IIA), CSIR Fourth Paradigm Institute (CSIR-4PI), Bengaluru, and the Institute for Advanced Sustainability Studies, Germany also contributed to the study.

The research published in the Journal of Atmospheric Pollution Research, Elsevier, shows that the atmospheric radiative effect due to PWV is about 3-4 times higher than aerosols, resulting in atmospheric heating rates of 0.94 and 0.96 K Day-1 at Nainital and Hanle, respectively. The results highlight the importance of PWV and aerosol radiative effects in the climate-sensitive Himalayan region.

The researchers assessed the combination of aerosols and water vapour radiative effects over the Himalayan range that is specifically important for regional climate and highlighted the importance of water vapour as a critical greenhouse gas and climate forcing agent Himalayan region.

The team believes that this work will comprehensively investigate the combined impact of aerosols and water vapour on the radiation budget.

**

The above article has been published from a wire source with minimal modifications to the headline and text.

https://weather.com/en-IN/india/science/news/2022-02-10-warming-in-the-high-altitudes-himalayas-owing-to-water-vapour

Tags:Altitude, Articles, Channel, high, Himalayas, increase, Leading, Presence, Shows, Study, Vapour, Warming, Water, Weather

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