EGU21-7776, updated on 30 Aug 2021
https://doi.org/10.5194/egusphere-egu21-7776
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Dry deposition fluxes of NH4+-N and NO3--N at a rural site of Indo-Gangetic Plain, India

Moh Naseem and Umesh Kulshrestha
Moh Naseem and Umesh Kulshrestha
  • Jawaharlal Nehru University , School of Environmental Sciences, India (mohnaseemmalik@gmail.com)

The world’s acute reactive nitrogen (Nr) deposition is chronically eroding the biospheric integrity and undermining earth system’s resilience to be in an accommodatable state. The present study comprehensively attempts to decipher the dry depositions of atmospheric inorganic Nr along with other major ions through dustfall fluxes. Authentic atmospheric dust samples were collected by incorporating a surrogate-surface approach at an agriculturally intensive rural site in Indo-Gangetic plain of India over a year-long temporal scale from October 2017-September 2018. The mean (±Standard Error) dry deposition fluxes of NH4+-N and NO3--N during the whole study period were observed as 0.41±0.09 kg ha-1 yr-1 and 6.51±1.58 kg ha-1 yr-1, respectively. The total percent ionic contribution to the dustfall flux was observed 2.95% and the descending order of their percent contribution in total ionic fluxes were observed as SO42- (31.46%) > Cl- (15.74%) > K+ (15.04%) > Ca2+ (13.97%) > Na+ (10.23 %) > NO3- (7.06%) > Mg2+ (4.43%) > F-(1.62%) > NH4+ (0.44%). The relative dominance of NO3--N over NH4+-N fluxes was maintained in all seasons during the whole monitoring period which could be attributed to the competitive exclusion of NH4+-N from acid-base neutralization reactions by other strong base cations in dustfall. Size-distribution and morphological analysis of dust particles from Scanning Electron Microscope images signified the anthropogenic involvement in shaping the dominant mode of particle-size distribution in dust fall fluxes which culminated into the dominance of fine-mode fraction over course-mode in dustfall.

How to cite: Naseem, M. and Kulshrestha, U.: Dry deposition fluxes of NH4+-N and NO3--N at a rural site of Indo-Gangetic Plain, India, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-7776, https://doi.org/10.5194/egusphere-egu21-7776, 2021.

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