TCCON and Extension of Measurement Capabilities into the Mid-IR
Abstract
The Total Carbon Column Observing Network (TCCON), a network of ground-based Fourier Transform Spectrometers that record direct solar spectra in the near-infrared, has been operational for over a decade now. Accurate and precise column-averaged abundances of many atmospheric constituents (including CO2, CH4, N2O, HF, CO, H2O, and HDO) are retrieved from these spectra, thus providing column CO2 abundances for satellite validation and valuable insights into regional- and global-scale carbon cycle processes. Recently, we have extended our measurement capabilities into the mid-IR using a dual detector, InGaAs/InSb, system in our Caltech TCCON instrument. With the addition of the InSb detector, we obtain coverage up to 5 µm (or down to 2000 cm-1) while still meeting the TCCON spectral requirements. This expanded capability allows for retrievals of HCN, C2H6, C2H2, H2CO, CH3OH, CH3Cl, OCS, which are tracers of wildfires, energy extraction, and GPP. In this work, we will describe our new TCCON set-up and its advantages and present some of our initial findings in our development of HCN, C2H6, OCS total columns. Finally, we will discuss plan to expand this capability to other TCCON sites.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFM.A51K0254R
- Keywords:
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- 0345 Pollution: urban and regional;
- ATMOSPHERIC COMPOSITION AND STRUCTURE