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Review status: a revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.
Intercomparison of TCCON data from two Fourier transform spectrometers at Lauder, New Zealand
Abstract. We describe the change of operational instrument for the routine measurement of column-averaged dry-air mole fraction of several greenhouse gases (denoted Xgas) at the Lauder Total Carbon Column Observing Network (TCCON) site and the steps taken to demonstrate comparability between the two observation systems following a systematic methodology.
Further, we intercompare retrieved Xgas values during an intensive intercomparison period during October and November 2018, when both instruments were performing optimally, and on subsequent, less frequent occasions. The average difference between the two observing systems was found to be well below the expected level of uncertainty for TCCON retrievals for all compared species. In the case of XCO2 the average difference was 0.0264 ± 0.0465 % (0.11 ± 0.19 μmol mol−1).
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