Geochemistry of aerosols of northwestern part of India adjoining the Thar desert

Seasonal Variations in Water Soluble Inorganic Ions, OC and EC in PM10 and PM>10 Aerosols over Delhi: Influence of Sources and Meteorological Factors

“…In autumn season, PM 10 load was higher in November compared to October month due to the burning of fire crackers during Diwali festival in North India (Tandon et al, 2008). Similar trends have been observed previously by Yadav and Rajamani, 2004;Rastogi and Sarin, 2009 based on their seasonal sampling done at different locations in north India.…”

“…The NO 3 -concentrations are lower than SO 4 2-in PM 10 whereas NO 3 -dominates over SO 4 2-in the PM >10 . Higher Ca 2+ in PM >10 is associated with carbonate rich dust transported from the Thar desert (Yadav and Rajamani, 2004) and local re-suspension of dust (Tandon et al, 2008). The CaCO 3 , CaSO 4 , Ca(NO 3 ) 2 are the dominant chemical forms of the particles contributed by desert dust particles (Radhi et al, 2010).…”

A Comparative Study on Fog and Dew Water Chemistry at New Delhi, India

“…The troposheric ozone also provides a pathway SO 2 oxidation under aqueous conditions (Hunt et al, 2015). The more than one value of Cl/Na ratio indicate that chloride ions find additional sources other than sea salt origin or the salt lakes in the western side of New Delhi (250 km away) which could have come via south westerly's during summer (Yadav and Rajamani, 2004). These sources for chloride ions could be plastic burning as has been reported by Kumar et al (2015).…”

“…The temperature inversion conditions and lowering of mixing height during night hours of winter season concentrates the pollutants near the ground level and the low temperature increases the dissolution of ammonia into water in ambient atmosphere (Kapoor et al, 1993;Ali et al, 2004;Cao et al, 2009;Kumar and Yadav, 2013). Source of Ca 2+ and Mg 2+ could come via dissolution of the secondary calcium carbonates present in aerosols (Yadav and Rajamani, 2004), construction activities going on around the sampling site and the re-suspension of surface dust (Tandon et al, 2008;Kumar and Yadav, 2013). However, biomass burning and a small contribution from the dense forests nearby sampling sites may contribute to potassium (Ali et al, 2004;Kumar and Yadav, 2013).…”

Climate induced temporal change in Sr-Nd isotope ratios in the valley-fill deposits of the Ganga river

“…However, study based on the Sr iso- Fig. 4 tope ratios in aerosol over the Ganga Plain show that the aerosol are characterized by very low Sr isotope ratio (Tripathi et al, 2004;Yadav and Rajamani, 2004), which are contrary to the results of the Firozpur core. The role of redistribution of sediments by plains-fed river can also be ruled out by the following arguments: i) 87 Singh et al, 2008) which seems to indicate exclusive Himalayan source for sediments, (ii) the Firozpur core was taken from the paleo-meanders of the Ganga river implying sediments of the Firozpur core were not deposited by plains-fed rivers (Sinha et al, 2007;Figs.…”