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PARENT SESSION

PW02 Atmospheric Chemistry
Exhibit Hall
8:00 AM - Wednesday

(PW023) On Correlation Aerosols and Gases in Atmosphere.

THAREJA, SUKARMA1, 1 CHRIST CHURCH COLLEGE, KANPUR 208001, CSJM KANPUR UNIVERSITY, KANPUR, UTTER PRADESH,INDIA, INDIA

ABSTRACT- Polluted urban air contains a wide variety of gases and aerosols.There are many photo chemical interactions between the atmospheric cycles of ozone, nitrogen, sulphur and chlorine and aerosol containing species, and hence these chemical species get correlated to each other in a complex manner and affect the atmosphere and season cycle . Therefore they cannot be studied independent of each other. It is not a very easy task to derive analytical equation to find the interdependence of gas/aerosol concentration as function of Temperature (T) and Relative Humidity(RH). However, it is possible to get information about the role of aerosol/gases concentration in chemistry of atmosphere by constructing Regression Coefficient (R2) matrix (CR1) from experimental data. Thermodynamic Calculations (TC) for a fixed concentration of ions of aerosol (IC) and water per unit volume at equilibrium with atmosphere of known T and RH can give us gas/aerosol distribution and their equilibrium composition in solid, liquid and vapour phases, which determine their environmental effects and lifetime in atmosphere.We have constructed Regression coefficient (R2) matrix CR1 for gaseous HNO3 , HCl, SO2 and aerosol NO3- , Cl- , SO4-2 , NH4+ across all sites in UK. In CR1 we found four grouped species (HNO3 ,NO3- ,NH4+ ,SO4-2) with R2 lies between +0.8 to 1.0.In this paper we present TC1 and TC2 which report meteorological conditions(MT) in terms of (IC,T,RH) that satisfies some important findings, reported in CR1. Aerosol/gases and tropospheric ozone play a key and unique role in Earth's climate system. HCl and HNO3 are two important gases which play key role in depletion of ozone layer. Keeping RH and IC(H+ ,Cl- ,NO3- ,SO4-2) fixed, TC3 was carried out at a) Antartica T(193K) b)at room T(298.15K). Results show that a) [HCl(g)]T >[HNO3 (g)]T >[H2SO4 (g)]T b)[[HCl(g)]/[HNO3 (g)]]193K >[[HCl(g)]/[HNO3 (g)]]298.15K. TC3 results implicitly reflect on the role of aerosol , HCl, HNO3 and T on the cycle of ozone in atmosphere.

Key words: regression coefficient matrix, aerosols, meteorological conditions , tropospheric ozone


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