Impact Assessment Of Uncertainty Of Spectroscopic Parameters On The Accuracy Of Trace Gases Abundance

We have studied sensitivity of the retrieved state vector (the atmospheric parameters)rnsuch as concentration (volume mixing ratio) profiles of targeted trace gases tornuncertainty in spectroscopic parameters. Spectral line strength and pressure broadenedrnhalf width of air are the spectroscopic parameters considered for this study.rnThe atmospheric trace gases, for which the sensitives studies are performed, includernsource gases such H2O, N2O, CH4 and SO2, and stratospheric gases such as HNO3rnand O3. The uncertainties of spectroscopic parameters considered ranges from 0.1%rnto 20% for spectral line strength and 0.1% to 3% for pressure broadened half width ofrnair. The comparisons of difference of VMR of retrieved trace gases with and withoutrnperturbation of the spectroscopic parameters have shown different characteristics forrndifferent gases. The sensitivity is high at lower altitudes for source gases (H2O, N2O,rnCH4) while the sensitivity for stratospheric gases (HNO3 and O3) is high at the altitudernof peak VMR. In the case of SO2, the impact is not noticeable, which is believedrnto be linked with undetectable level of SO2 under normal atmospheric conditions

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