Anshu Sharma, U.C. Kulshrestha 

School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India


Received: June 23, 2019
Revised: March 4, 2020
Accepted: March 6, 2020
Download Citation: ||https://doi.org/10.4209/aaqr.2019.06.0279  

  • Download: PDF


Cite this article:

Sharma, A. and Kulshrestha, U. (2020). Wet Deposition and Long-range Transport of Major Ions Related to Snow at Northwestern Himalayas (India). Aerosol Air Qual. Res., https://doi.org/10.4209/aaqr.2019.06.0279


HIGHLIGHTS

  • The pH values of snow at Leh and Nirmand were recorded above 5.6.
  • But at Beerwah site, almost 60% of the samples were found to be acidic.
  • Ca2+ dominated at Leh and Beerwah sites whereas NH4+ at Nirmand site.
  • Major ions are contributed by local as well as LRT.
  • Himalayan ecosystem is loaded with the deposition of major acidifying ions.
 

ABSTRACT


The present study was carried out to understand the snow chemistry with special emphasis on the estimation of wet deposition fluxes and transportation of ionic species to the Himalayan regions from December 2015 to March 2017. All the snow samples were collected from three different sites of two locations, Jammu & Kashmir and Himachal Pradesh. In Jammu and Kashmir we have selected two sites, (an urban area Leh and other one was semi-urban area Beerwah). In Himachal Pradesh, we selected a site at Nirmand village which was a rural area. At Leh and Nirmand village, samples were showing higher alkalinity than at Beerwah site. The pH values of snow at Leh and Nirmand were recorded above 5.6 except one sample of both the sites. However, at Beerwah site almost 60% of the samples were found acidic (below 5.6) in nature. All these three sites showed three different means of neutralization and pH control. The study revealed that the high pH value of snowfall at Leh site could be due to the presence very high value of Ca2+ whereas the moderate pH at Nirmand village may be due to moderate concentration of Ca2+ and high NH4+. In contrast at Beerwah site, low pH is probably due to very low concentrations of all the major cations. This study also suggested that non-sea salt sources contributed a significant fraction of SO42–, K+, Ca2+, and Mg2+. However, on average, a significant amount of HCO3 was measured at all the three sites, indicating a substantial role of crustal sources in the study sites. Results of this study showed that these ionic species are contributed by local as well as long-distance sources in the region. Backward airmass trajectory analysis revealed that the ionic species were contributed by the airmasses coming from North Atlantic Ocean, Africa, Europe, Middle East, and Mediterranean region to all these sites through long-range transport (LRT).


Keywords: Snow, pH, ionic chemistry, wet deposition flux, back trajectory analysis.




Impact Factor: 2.735

5-Year Impact Factor: 2.827


SCImago Journal & Country Rank

Enter your email below to receive latest published articles in your field.