scholarly journals Review of “Instrumental characteristics and Greenhouse gases measurement capabilities of the Compact High-spectral Resolution Infrared Spectrometer: CHRIS“ by El Kattar et al.

2019 ◽  
Author(s):  
Anonymous
Keyword(s):  
Greenhouse Gases ◽  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Infrared Spectrometer ◽  
Measurement Capabilities

scholarly journals Instrumental characteristics and Greenhouse gases measurement capabilities of the Compact High-spectral Resolution Infrared Spectrometer: CHRIS

2019 ◽  
Author(s):  
Marie-Thérèse El Kattar ◽  
Frédérique Auriol ◽  
Hervé Herbin
Keyword(s):  
Greenhouse Gases ◽  
Spectral Resolution ◽  
Complete Information ◽  
High Spectral Resolution ◽  
Gaseous Species ◽  
Future Space ◽  
Infrared Measurements ◽  
Thermal Region ◽  
Portable Spectrometers ◽  
Infrared Spectrometer

Abstract. Ground-based high spectral resolution infrared measurements are an efficient way to obtain accurate tropospheric abundances of different gaseous species and in particular GreenHouse Gases (GHG), such as CO2 and CH4. Many ground-based spectrometers are used in the NDACC and TCCON networks to validate the Level 2 satellite data, but their large dimensions and heavy mass makes them inadequate for field campaigns. To overcome these problems, the use of portable spectrometers was recently investigated. In this context, this paper deals with the CHRIS (Compact High-spectral Resolution Infrared Spectrometer) prototype with unique characteristics such as its high spectral resolution (0.135 cm-1 non-apodized) and its wide spectral range (680 to 5200 cm-1). Its main objective is the characterization of gases and aerosols in the infrared thermal region, that's why it requires high radiometric precision and accuracy, which is achieved by performing spectral and radiometric calibrations that will be presented in this paper. Also, CHRIS's capabilities to retrieve CO2 and CH4 vertical profiles are presented through a complete information content analysis, a channel selection and an error budget estimation in the attempt to join the ongoing campaigns, such as MAGIC, to monitor the GHG and validate the actual and future space missions.

scholarly journals Instrumental characteristics and potential greenhouse gas measurement capabilities of the Compact High-Spectral-Resolution Infrared Spectrometer: CHRIS

2020 ◽  
Vol 13 (7) ◽  
pp. 3769-3786
Author(s):  
Marie-Thérèse El Kattar ◽  
Frédérique Auriol ◽  
Hervé Herbin
Keyword(s):  
Greenhouse Gases ◽  
Spectral Resolution ◽  
Complete Information ◽  
Atmospheric Composition ◽  
High Spectral Resolution ◽  
Gaseous Species ◽  
Infrared Measurements ◽  
Gas Measurement ◽  
Portable Spectrometers ◽  
Infrared Spectrometer

Abstract. Ground-based high-spectral-resolution infrared measurements are an efficient way to obtain accurate tropospheric abundances of different gaseous species, in particular greenhouse gases (GHGs) such as CO2 and CH4. Many ground-based spectrometers are used in the NDACC and TCCON networks to validate the Level 2 satellite data, but their large dimensions and heavy mass make them inadequate for field campaigns. To overcome these problems, the use of portable spectrometers was recently investigated. In this context, this paper deals with the CHRIS (Compact High-Spectral-Resolution Infrared Spectrometer) prototype with unique characteristics such as its high spectral resolution (0.135 cm−1 nonapodized) and its wide spectral range (680 to 5200 cm−1). Its main objective is the characterization of gases and aerosols in the thermal and shortwave infrared regions. That is why it requires high radiometric precision and accuracy, which are achieved by performing spectral and radiometric calibrations that are described in this paper. Furthermore, CHRIS's capabilities to retrieve vertical CO2 and CH4 profiles are presented through a complete information content analysis, a channel selection and an error budget estimation in the attempt to join ongoing campaigns such as MAGIC (Monitoring of Atmospheric composition and Greenhouse gases through multi-Instruments Campaigns) to monitor GHGs and validate the actual and future space missions such as IASI-NG and Microcarb.

Ground-based atmospheric measurements from CHRIS for satellite validation.

2020 ◽  
Author(s):  
El Kattar Marie-Thérèse ◽  
Auriol Frédérique ◽  
Herbin Hervé
Keyword(s):  
Greenhouse Gases ◽  
Spectral Resolution ◽  
Trace Gases ◽  
Space Missions ◽  
High Spectral Resolution ◽  
Radiative Transfer Model ◽  
Transfer Model ◽  
Atmospheric Measurements ◽  
Gaseous Species ◽  
Infrared Measurements

<p>Ground-based high spectral resolution infrared measurements are considered to be the most efficient way to obtain accurate tropospheric abundances of different gaseous species and in particular greenhouse gases, such as CO<sub>2</sub> and CH<sub>4</sub>. Furthermore, this type of measurement is also commonly used to validate the satellite retrievals. Despite the outstanding capabilities of the spectrometers used by the TCCON and NDACC networks, they are inadequate for field campaigns; therefore, more compact and stable spectrometers have been developed. <strong>CHRIS</strong> (<strong>C</strong>ompact <strong>H</strong>igh <strong>S</strong>pectral <strong>R</strong>esolution <strong>I</strong>nfrared <strong>S</strong>pectrometer) is a new prototype based on the EM27-SUN from Bruker, with unique characteristics such as its high spectral resolution (0.135 cm<sup>-1</sup> non-apodized) with a spectral sampling every 0.065 cm<sup>-1</sup> to satisfy the Nyquist criterion. This optically stable instrument allows recording solar transmission light spectra in a wide spectral range (680 to 5200 cm<sup>-1</sup>) with a relatively high SNR (~780 in average).</p><p> </p><p>            This instrumental prototype is designed to perform measurements of greenhouse gases (CO<sub>2</sub>, CH<sub>4</sub> and H<sub>2</sub>O), trace gases (SO<sub>2</sub>, CO, HCl, NO<sub>x</sub>…) but also aerosols and clouds that have very typical spectral features in particular in the thermal infrared region. The main objective of this study is the accurate retrieval of tropospheric abundances of the greenhouse gases, CO<sub>2</sub> and CH<sub>4</sub>, in the TIR/SWIR regions, and study the synergy between them especially for the MAGIC campaign. CHRIS is a part of this ongoing campaign in an attempt to monitor the GHG and validate the actual space missions like IASI, OCO-2, GOSAT-2 and future space missions like Merlin, MicroCarb and IASI-NG.</p><p> </p><p>            Here, the spectral and radiometric characterization of this instrument is briefly explained. Furthermore, we present CHRIS’s capabilities to measure CO<sub>2</sub> and CH<sub>4</sub> vertical profiles through a complete information content analysis, a channel selection and an error budget estimation. The preliminary results of the retrieval of these gases using the radiative transfer model ARAHMIS developed at the LOA is also presented. CHRIS is also part of other campaigns such as ImagEtna and Shadow-2 to study the trace gases and aerosols respectively.</p>

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