scholarly journals Application of Hadamard transform spectrometer to long-path absorption measurements of atmospheric trace species.

1986 ◽  
Vol 35 (3) ◽  
pp. 225-233 ◽  
Author(s):  
Nobuo SUGIMOTO
Keyword(s):  
Hadamard Transform ◽  
Trace Species ◽  
Absorption Measurements

scholarly journals CFC-11, CFC-12 and HCFC-22 ground-based remote sensing FTIR measurements at Réunion Island and comparisons with MIPAS/ENVISAT data

2016 ◽  
Vol 9 (11) ◽  
pp. 5621-5636 ◽  
Author(s):  
Minqiang Zhou ◽  
Corinne Vigouroux ◽  
Bavo Langerock ◽  
Pucai Wang ◽  
Geoff Dutton ◽  
...  
Keyword(s):  
Michelson Interferometer ◽  
Species Group ◽  
Reunion Island ◽  
Solar Absorption ◽  
Trace Species ◽  
Réunion Island ◽  
Peak Sensitivity ◽  
Random Uncertainties ◽  
Absorption Measurements ◽  
Good Agreement

Abstract. Profiles of CFC-11 (CCl3F), CFC-12 (CCl2F2) and HCFC-22 (CHF2Cl) have been obtained from Fourier transform infrared (FTIR) solar absorption measurements above the Saint-Denis (St Denis) and Maïdo sites at Réunion Island (21° S, 55° E) with low vertical resolution. FTIR profile retrievals are performed by the well-established SFIT4 program and the detail retrieval strategies along with the systematic/random uncertainties of CFC-11, CFC-12 and HCFC-22 are discussed in this study. The FTIR data of all three species are sensitive to the whole troposphere and the lowermost stratosphere, with the peak sensitivity between 5 and 10 km. The ground-based FTIR data have been compared with the collocated Michelson Interferometer for Passive Atmospheric Sounding (MIPAS/ENVISAT) data and found to be in good agreement: the observed mean relative biases and standard deviations of the differences between the smoothed MIPAS and FTIR partial columns (6–30 km) are (−4.3 and 4.4 %), (−2.9 and 4.6 %) and (−0.7 and 4.8 %) for CFC-11, CFC-12 and HCFC-22, respectively, which are within the combined error budgets from both measurements. The season cycles of CFC-11, CFC-12 and HCFC-22 from FTIR measurements and MIPAS data show a similar variation: concentration is highest in February–April and lowest in August–October. The trends derived from the combined St Denis and Maïdo FTIR time series are −0.86 ± 0.12 and 2.84 ± 0.06 % year−1 for CFC-11 and HCFC-22, respectively, for the period 2004 to 2016, and −0.76 ± 0.05 % year−1 for CFC-12 for 2009 to 2016. These measurements are consistent with the trends observed by the National Oceanic and Atmospheric Administration (NOAA) Global Monitoring Division's (GMD) Halocarbons & other Atmospheric Trace Species Group (HATS) measurements at Samoa (14.2° S, 170.5° W) for CFC-11 (−0.87 ± 0.04 % year−1), but slightly weaker for HCFC-22 (3.46 ± 0.05 %) year−1 and stronger for CFC-12 (−0.60 ± 0.02 % year−1).

scholarly journals CFC-11, CFC-12 and HCFC-22 ground-based remote sensing FTIR measurements at Reunion Island and comparisons with MIPAS/ENVISAT data

2016 ◽  
Author(s):  
Minqiang Zhou ◽  
Corinne Vigouroux ◽  
Bavo Langerock ◽  
Pucai Wang ◽  
Geoff Dutton ◽  
...  
Keyword(s):  
Michelson Interferometer ◽  
Species Group ◽  
Reunion Island ◽  
Solar Absorption ◽  
Trace Species ◽  
Réunion Island ◽  
Peak Sensitivity ◽  
Random Uncertainties ◽  
Absorption Measurements ◽  
Good Agreement

Abstract. Profiles of CFC-11 (CCl3F), CFC-12 (CCl2F2) and HCFC-22 (CHF2Cl) have been obtained from Fourier transform infrared (FTIR) solar absorption measurements above the Saint-Denis (St Denis) and Maïdo sites at Reunion Island (21º S, 55º E) with low vertical resolution. FTIR profile retrievals are performed by the SFIT4 program and the detail retrieval strategies along with the systematic/random uncertainties of CFC-11, CFC-12, and HCFC-22 are discussed in this study. The FTIR data of all three species are sensitive to the whole troposphere and the lowermost stratosphere, with the peak sensitivity between 5 and 10 km. The trends derived from the combined St Denis and Maïdo FTIR time-series are −0.86 ± 0.12 % and 2.75 ± 0.12 % for CFC-11 and HCFC-22, respectively, for the period 2004 to 2016 , and −0.76 ± 0.05 % for CFC-12 for 2009 to 2016. These measurements are consistent with the trends observed by the National Oceanic and Atmospheric Administration (NOAA) Global Monitoring Division’s (GMD) Halocarbons & other Atmospheric Trace Species Group (HATS) measurements at Samoa (14.2° S, 170.5° W) for CFC-11 (−0.87 ± 0.04 %), but slightly weaker for HCFC-22 (3.46 ± 0.05 %) and stronger for CFC-12 (-0.60 ± 0.02 %). The ground-based FTIR data have also been compared with the collocated Michelson Interferometer for Passive Atmospheric Sounding (MIPAS/ENVISAT) data, and found to be in good agreement: the observed mean relative biases and standard deviations of the differences between the smoothed MIPAS and FTIR partial columns (6−30 km) are (−4.3 % and 4.4 %), (−2.9 % and 4.6 %) and (−0.7 % and 6.0 %) for CFC-11, CFC-12, and HCFC-22, respectively, which are within the combined error budgets from both measurements.

High-Bandwidth Laser-Absorption Measurements of Temperature, Pressure, CO, and H2O in the Annulus of a Rotating Detonation Rocket Engine

2021 ◽  
Author(s):  
Garrett C. Mathews ◽  
Matthew Blaisdell ◽  
Aaron I. Lemcherfi ◽  
Carson D. Slabaugh ◽  
Christopher S. Goldenstein
Keyword(s):  
Rocket Engine ◽  
Laser Absorption ◽  
High Bandwidth ◽  
Rotating Detonation ◽  
Absorption Measurements
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