Impacts of changing atmospheric deposition chemistry on nitrogen and phosphorus loading to Ganga River (India).

Investigations on atmospheric deposition (AD) and water chemistry along a 35 km stretch of Ganga River indicated that although N:P stoichiometry of AD did not change, there were over 1.4-2.0 fold increase in AD-NO3⁻, AD-NH4⁺ and AD-PO4³â» overtime. Concentration of dissolved inorganic-N (DIN) in river showed significant positive correlations with AD-NO3⁻ and runoff DIN. Similarly, dissolved reactive-P (DRP) in river showed significant positive correlation with AD-PO4³â» and runoff DRP. The study shows that AD has become an important source of N and P input to Ganga River.