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Remotely operable compact instruments for measuring atmospheric CO2 and CH4column densities were developed in two independent systems: one utilizing agrating-based desktop optical spectrum analyzer (OSA) with a resolution enough toresolve rotational lines of CO2 and CH4 in the regions of 1565–1585 and 1674–1682 nm,respectively; the other is an application of an optical fiber Fabry-Perot interferometer(FFPI) to obtain the CO2 column density. Direct sunlight was collimated via a smalltelescope installed on a portable sun tracker and then transmitted through an opticalfiber into the OSA or the FFPI for optical analysis. The near infrared spectra of the OSAwere retrieved by a least squares spectral fitting algorithm. The CO2 and CH4 columndensities deduced were in excellent agreement with those measured by a Fouriertransform spectrometer with high resolution. The rovibronic lines in the wavelengthregion of 1570–1575 nm were analyzed by the FFPI. The I0 and I values in theBeer-Lambert law equation to obtain CO2 column density were deduced by modulatingtemperature of the FFPI, which offered column CO2 with the statistical error less than0.2% for six hours measurement

atmospheric measurement techniques

Remotely operable compact instruments for measuring atmospheric CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt; column densities at surface monitoring sites