Preprints
https://doi.org/10.5194/egusphere-2022-1277
https://doi.org/10.5194/egusphere-2022-1277
22 Nov 2022
22 Nov 2022
Status: this preprint is open for discussion.

Air pollution reductions caused by the COVID-19 lockdown open up a way to preserve the Himalayan snow cover

Suvarna Fadnavis1, Bernd Heinold2, Thazhe Purayil Sabin1, Anne Kubin2, Wan Ting Katty Huang3, Alexandru Rap4, and Rolf Müller5 Suvarna Fadnavis et al.
  • 1Indian Institute of Tropical Meteorology, Centre for climate change research, Ministry of Earth Sciences, India
  • 2Leibniz-Institut für Troposphärenforschung, Leipzig, Germany
  • 3Department of Civil, Environmental and Geomatic Engineering, University College London, London, United Kingdom
  • 4School of Earth and Environment, University of Leeds, Leeds, UK
  • 5Forschungszentrum Jülich GmbH, IEK-7, Jülich, Germany

Abstract. The rapid melting of glaciers in the Hindu Kush Himalayas (HKH) during recent decades poses an alarming threat to water security for lager parts of Asia. If this melting persists, the entire Himalayan glaciers is estimated to disappear by end of 21st century. Here, we assess the influence of the spring 2020 COVID-19 lockdown on the HKH, demonstrating the potential benefits of a strict emission reduction roadmap. Chemistry-climate model simulations, supported by satellite and ground measurements, show that lower air pollution during lockdown led to a reduction in black carbon in snow (2–14 %) and thus in snow melting (10–40 %). This caused increases in snow cover (6–12 %) and mass (2–20 %) and a decrease in runoff (5–55 %) over the HKH and Tibetan Plateau, ultimately leading to an enhanced snow-water-equivalent (3.3–55 %). We emphasize the necessity for immediate anthropogenic pollution reductions to address the hydro-climatic threat to billions of people in South Asia.

Suvarna Fadnavis et al.

Status: open (until 23 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Suvarna Fadnavis et al.

Suvarna Fadnavis et al.

Viewed

Total article views: 166 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
118 43 5 166 15 2 2
  • HTML: 118
  • PDF: 43
  • XML: 5
  • Total: 166
  • Supplement: 15
  • BibTeX: 2
  • EndNote: 2
Views and downloads (calculated since 22 Nov 2022)
Cumulative views and downloads (calculated since 22 Nov 2022)

Viewed (geographical distribution)

Total article views: 161 (including HTML, PDF, and XML) Thereof 161 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 06 Dec 2022
Download
Short summary
The influence of COVID-19 lockdown on the Himalayas caused increases in snow-cover and a decrease in runoff, ultimately leading to an enhanced snow-water-equivalent. Our findings highlight that out of the two processes causing a retreat of Himalayan glaciers: (1) a slow response by global climate change and (2) fast response of local air pollution, a policy action on the latter is more likely to be within reach of possible policy action to help billons of people in south Asia.