- Dona Paula, Goa, India.
- +91-0832- 2450327
- iiosc2020[at]nio[dot]org
Abstract Submission No. | ABS-2022-08-0317 |
Title of Abstract | Seasonal variability of trace metal composition of atmospheric aerosol over Northeast Arabian Sea |
Authors | P. P.Panda*, Ashwini Kumar, M. A. Aswini, Ankush, Siby Kurian |
Organisation | CSIR-National Institute of Oceanography, Goa, India |
Address | B-32, NIO staff colony,Dona-paula Goa, GOA, India Pincode: 403004 Mobile: 8903645024 E-mail: ppesc.pu@gmail.com |
Country | India |
Presentation | Oral |
Abstract | Atmospheric deposition is one of the major sources of macro and micro-nutrients to the surface waters of coastal and open oceanic regions. Subsequent to their deposition, they can impact on surface water biogeochemical processes, including primary productivity. It is thus important to quantify the composition and fluxes of trace metals (which also act as micronutrients) in the atmospheric aerosol over the marine region. In this context, we are reporting here trace metal composition of aerosols at a coastal location in the Northeast Arabian Sea (Goa; 15.46°N, 73.8°E,~55.8 m above sea level).
Size-fractionated aerosols (PM10 and PM2.5) were collected on the main building terrace of CSIR-NIO, Goa (~35m above from mean sea level and nearly 500m away from Arabian seacoast) using high volume samplers from December 2018 to February 2019 (excluding monsoon period (May 2018-August 2018). Subsequently, all samples were acid digested using HF and HNO3 in Savillex vials under clean flow-bench and trace elements (Cr, Mn, Co, Ni, Cu, Zn, Cd, Pb) were analyzed using HR-ICP-MS (Attom ES) and major elements (Al, Fe) by using ICP-OES (AGILENT-710 Axial).
We estimated dust abundance (in µgm-3) using Al concentration, presuming Al value similar to upper continental crust. Preliminary data shows uniform mineral dust concentration during summer and winter months (25.7±10.3 and 25.1± 8.6 µg m3 respectively) in PM10, however, lower values were observed in post-monsoon season. Very low values of dust concentration were observed in PM2.5, compared to PM10. In order to understand the anthropogenic impact on ambient aerosols, we calculated enrichment factors (EF) for trace metals. Our data suggest Fe, Cr, and Co are normally enriched element with EF<10, throughout the year suggesting no significant contribution from anthropogenic sources for mentioned element. However, Mn and Ni show significant enrichment with 0 |