Using portable low-resolution spectrometers to evaluate TCCON biases in North America
EM27/SUN devices are portable solar-viewing Fourier transform spectrometers (FTSs) that are being widely used to constrain measurements of greenhouse gas emissions and validate satellite trace gas measurements. On a 6-week-long campaign in the summer of 2018, four EM27/SUN devices were taken to five...
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ftcopernicus:oai:publications.copernicus.org:egusphere107982 2023-05-15T15:17:09+02:00 Using portable low-resolution spectrometers to evaluate TCCON biases in North America Mostafavi Pak, Nasrin Hedelius, Jacob Roche, Sebastien Cunningham, Liz Baier, Bianca Sweeney, Colm Roehl, Coleen Laughner, Joshua Toon, Geoffrey Wennberg, Paul Parker, Harrison Arrowsmith, Colin Mendonca, Joseph Fogal, Pierre Wizenberg, Tyler Herrera, Beatriz Strong, Kimberly Walker, Kaley A. Vogel, Felix Wunch, Debra 2023-03-09 application/pdf https://doi.org/10.5194/egusphere-2022-1331 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1331/ eng eng doi:10.5194/egusphere-2022-1331 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1331/ eISSN: Text 2023 ftcopernicus https://doi.org/10.5194/egusphere-2022-1331 2023-03-13T17:23:10Z EM27/SUN devices are portable solar-viewing Fourier transform spectrometers (FTSs) that are being widely used to constrain measurements of greenhouse gas emissions and validate satellite trace gas measurements. On a 6-week-long campaign in the summer of 2018, four EM27/SUN devices were taken to five Total Carbon Column Observing Network (TCCON) stations in North America, to measure side by side, to better understand their durability, the accuracy and precision of retrievals from their trace gas measurements, and to constrain site-to-site bias among TCCON sites. We developed new EM27/SUN data products using both previous and current versions of the retrieval algorithm (GGG2014 and GGG2020) and used coincident AirCore measurements to tie the gas retrievals to the World Meteorological Organization (WMO) trace gas standard scales. We also derived air-mass-dependent correction factors for the EM27/SUN devices. Pairs of column-averaged dry-air mole fractions (denoted with an X ) measured by the EM27/SUN devices remained consistent compared to each other during the entire campaign, with a 10 min averaged precision of 0.3 ppm (parts per million) for XCO 2 , 1.7 ppb (parts per billion) for XCH 4 , and 2.5 ppb for XCO. The maximum biases between TCCON stations were reduced in GGG2020 relative to GGG2014 from 1.3 to 0.5 ppm for XCO 2 and from 5.4 to 4.3 ppb for XCH 4 but increased for XCO from 2.2 to 6.1 ppb. The increased XCO biases in GGG2020 are driven by measurements at sites influenced by urban emissions (Caltech and the Armstrong Flight Research Center) where the priors overestimate surface CO. In addition, in 2020, one EM27/SUN instrument was sent to the Canadian Arctic TCCON station at Eureka, and side-by-side measurements were performed in March–July. In contrast to the other TCCON stations that showed an improvement in the biases with the newer version of GGG, the biases between Eureka's TCCON measurements and those from the EM27/SUN degraded with GGG2020, but this degradation was found to be caused by a ... Text Arctic Copernicus Publications: E-Journals Arctic Eureka ENVELOPE(-85.940,-85.940,79.990,79.990) |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
EM27/SUN devices are portable solar-viewing Fourier transform spectrometers (FTSs) that are being widely used to constrain measurements of greenhouse gas emissions and validate satellite trace gas measurements. On a 6-week-long campaign in the summer of 2018, four EM27/SUN devices were taken to five Total Carbon Column Observing Network (TCCON) stations in North America, to measure side by side, to better understand their durability, the accuracy and precision of retrievals from their trace gas measurements, and to constrain site-to-site bias among TCCON sites. We developed new EM27/SUN data products using both previous and current versions of the retrieval algorithm (GGG2014 and GGG2020) and used coincident AirCore measurements to tie the gas retrievals to the World Meteorological Organization (WMO) trace gas standard scales. We also derived air-mass-dependent correction factors for the EM27/SUN devices. Pairs of column-averaged dry-air mole fractions (denoted with an X ) measured by the EM27/SUN devices remained consistent compared to each other during the entire campaign, with a 10 min averaged precision of 0.3 ppm (parts per million) for XCO 2 , 1.7 ppb (parts per billion) for XCH 4 , and 2.5 ppb for XCO. The maximum biases between TCCON stations were reduced in GGG2020 relative to GGG2014 from 1.3 to 0.5 ppm for XCO 2 and from 5.4 to 4.3 ppb for XCH 4 but increased for XCO from 2.2 to 6.1 ppb. The increased XCO biases in GGG2020 are driven by measurements at sites influenced by urban emissions (Caltech and the Armstrong Flight Research Center) where the priors overestimate surface CO. In addition, in 2020, one EM27/SUN instrument was sent to the Canadian Arctic TCCON station at Eureka, and side-by-side measurements were performed in March–July. In contrast to the other TCCON stations that showed an improvement in the biases with the newer version of GGG, the biases between Eureka's TCCON measurements and those from the EM27/SUN degraded with GGG2020, but this degradation was found to be caused by a ... |
format |
Text |
author |
Mostafavi Pak, Nasrin Hedelius, Jacob Roche, Sebastien Cunningham, Liz Baier, Bianca Sweeney, Colm Roehl, Coleen Laughner, Joshua Toon, Geoffrey Wennberg, Paul Parker, Harrison Arrowsmith, Colin Mendonca, Joseph Fogal, Pierre Wizenberg, Tyler Herrera, Beatriz Strong, Kimberly Walker, Kaley A. Vogel, Felix Wunch, Debra |
spellingShingle |
Mostafavi Pak, Nasrin Hedelius, Jacob Roche, Sebastien Cunningham, Liz Baier, Bianca Sweeney, Colm Roehl, Coleen Laughner, Joshua Toon, Geoffrey Wennberg, Paul Parker, Harrison Arrowsmith, Colin Mendonca, Joseph Fogal, Pierre Wizenberg, Tyler Herrera, Beatriz Strong, Kimberly Walker, Kaley A. Vogel, Felix Wunch, Debra Using portable low-resolution spectrometers to evaluate TCCON biases in North America |
author_facet |
Mostafavi Pak, Nasrin Hedelius, Jacob Roche, Sebastien Cunningham, Liz Baier, Bianca Sweeney, Colm Roehl, Coleen Laughner, Joshua Toon, Geoffrey Wennberg, Paul Parker, Harrison Arrowsmith, Colin Mendonca, Joseph Fogal, Pierre Wizenberg, Tyler Herrera, Beatriz Strong, Kimberly Walker, Kaley A. Vogel, Felix Wunch, Debra |
author_sort |
Mostafavi Pak, Nasrin |
title |
Using portable low-resolution spectrometers to evaluate TCCON biases in North America |
title_short |
Using portable low-resolution spectrometers to evaluate TCCON biases in North America |
title_full |
Using portable low-resolution spectrometers to evaluate TCCON biases in North America |
title_fullStr |
Using portable low-resolution spectrometers to evaluate TCCON biases in North America |
title_full_unstemmed |
Using portable low-resolution spectrometers to evaluate TCCON biases in North America |
title_sort |
using portable low-resolution spectrometers to evaluate tccon biases in north america |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2022-1331 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1331/ |
long_lat |
ENVELOPE(-85.940,-85.940,79.990,79.990) |
geographic |
Arctic Eureka |
geographic_facet |
Arctic Eureka |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2022-1331 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-1331/ |
op_doi |
https://doi.org/10.5194/egusphere-2022-1331 |
_version_ |
1766347419578007552 |