Improvements to the accuracy of measurements of NO2 by zenith-sky visible spectrometers II: errors in zero using a more complete chemical model

Using a flexible chemical box model with full heterogeneous chemistry, intercepts of chemically modified Langley plots have been computed for the 5 years of zenith-sky NO2 data from Faraday in Antarctica (65°S). By using these intercepts as the effective amount in the reference spectrum, drifts in z...

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Bibliographic Details
Published in:Journal of Quantitative Spectroscopy and Radiative Transfer
Main Authors: Roscoe, H., Charlton, Andrew J., Fish, Deborah J., Hill, Julian G. T.
Format: Article in Journal/Newspaper
Language:unknown
Published: Elsevier 2001
Subjects:
551 Geology
hydrology
meteorology
Faraday
Antarc*
Antarctica
Online Access:https://centaur.reading.ac.uk/1583/
https://doi.org/10.1016/S0022-4073(00)00058-3
Description
Summary:Using a flexible chemical box model with full heterogeneous chemistry, intercepts of chemically modified Langley plots have been computed for the 5 years of zenith-sky NO2 data from Faraday in Antarctica (65°S). By using these intercepts as the effective amount in the reference spectrum, drifts in zero of total vertical NO2 were much reduced. The error in zero of total NO2 is ±0.03×1015 moleccm−2 from one year to another. This error is small enough to determine trends in midsummer and any variability in denoxification between midwinters. The technique also suggests a more sensitive method for determining N2O5 from zenith-sky NO2 data.

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