Towards high-temporal-resolution global monitoring of atmospheric carbon-dioxide using a compact spaceborne spatial heterodyne SWIR spectrometer: SHACS

Ikpaya Ikpaya; Craig Underwood

doi:10.1117/12.2675711

13 June 2023 Towards high-temporal-resolution global monitoring of atmospheric carbon-dioxide (CO₂) using a compact spaceborne spatial heterodyne SWIR spectrometer: SHACS

Ikpaya Ikpaya, Craig Underwood

Author Affiliations +

Proceedings Volume 12534, Infrared Technology and Applications XLIX; 1253422 (2023) https://doi.org/10.1117/12.2675711
Event: SPIE Defense + Commercial Sensing, 2023, Orlando, Florida, United States

Conference Poster

Abstract

The issue of climate change is of ever-increasing concern to the global community and key to understanding the problem is the characterization of sources, sinks and transportation of greenhouse gases (GHGs) such as atmospheric carbondioxide (CO₂). This requires space-based observations to provide a truly global picture, due to the sparse nature of terrestrial monitoring sites. The sparseness of these sites, especially along the tropics makes it difficult to determine the extent of carbon fluxes around the equatorial regions. To fully characterize the problem, a high spatial and temporal resolution is needed. Although atmospheric CO₂ can be detected optically by small satellites, precise quantitative mapping requires extremely high precision (0.3% to 0.5%) measurements of gas concentrations at spectral absorption bands of 1.56-1.62μm and 1.92-2.06μm wavelengths, using high resolution spectrometers (e.g. 0.27 cm^-1 resolution at a signal-to-noise ratio (SNR) of >300:1). This normally requires high-performance, large and complex instruments, carried by single, large and expensive satellites. No single satellite can provide high temporal resolution. Therefore, a constellation of satellites is needed to resolve the underestimation of CO₂ uptake (sink) by the terrestrial biosphere. In this paper, we present the developmental progress of SHACS—a low-cost, compact, precision, robust, no-moving part spatial heterodyne atmospheric carbon-dioxide spectrometer, and also present some results of the Total Column Carbon-dioxide (TCCO₂) measurements obtained at Surrey in June 2019. The SHACS instrument has achieved a high measurement precision of <0.3% and a high spectral resolution of 0.22 cm^-1 at a high SNR of >900:1.

Citation Download Citation

Ikpaya Ikpaya and Craig Underwood "Towards high-temporal-resolution global monitoring of atmospheric carbon-dioxide (CO₂) using a compact spaceborne spatial heterodyne SWIR spectrometer: SHACS", Proc. SPIE 12534, Infrared Technology and Applications XLIX, 1253422 (13 June 2023); https://doi.org/10.1117/12.2675711

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