Retrieval of vertical profiles and tropospheric CO<sub>2</sub> columns based on high-resolution FTIR over Hefei, China

Shan, Changgong; Wang, Wei; Liu, Cheng; Yu, G. C.; Xie, Yu; Sun, Youwen; Hu, Qihou; Zhang, Huifang; Yin, Hao; Jones, Nicholas

doi:10.1364/oe.411383

Cited by 15 publications

(25 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…According to the HITRAN2020 database, as well as previous studies, micro-windows near 2600 cm −1 and 4800 cm −1 are selected separately. The interfering gases simultaneously retrieved in each band are given in Table 1 [10,12,24]. Figure 3 shows two typical spectra near 2600 cm −1 collected at 01:57 UTC on 16 April 2019 with a solar zenith angle (SZA) of 48.67 • and near 4800 cm −1 collected at 01:26 UTC on 16 April 2019 with a SZA of 43.35 • , respectively.…”

Section: Spectral Type Nh Hh F7lmentioning

confidence: 99%

Optimizing the Atmospheric CO2 Retrieval Based on the NDACC-Type FTIR Mid-Infrared Spectra at Xianghe, China

Wang,

Zhou,

Langerock

et al. 2024

Remote Sensing

View full text Add to dashboard Cite

Carbon dioxide (CO2) is the most important long-lived greenhouse gas and can be retrieved using solar absorption spectra recorded by a ground-based Fourier-transform infrared spectrometer (FTIR). In this study, we investigate the CO2 retrieval strategy using the Network for the Detection of Atmospheric Composition Change–Infrared Working Group (NDACC–IRWG) type spectra between August 2018 and April 2022 (~4 years) at Xianghe, China, aiming to find the optimal observed spectra, retrieval window, and spectroscopy. Two spectral regions, near 2600 and 4800 cm−1, are analyzed. The differences in column-averaged dry-air mole fraction of CO2 (XCO2) derived from spectroscopies (ATM18, ATM20, HITRAN2016, and HITRAN2020) can be up to 1.65 ± 0.95 ppm and 7.96 ± 2.02 ppm for NDACC-type 2600 cm−1 and 4800 cm−1 retrievals, respectively, which is mainly due to the CO2 differences in air-broadened Lorentzian HWHM coefficient (γair) and line intensity (S). HITRAN2020 provides the best fitting, and the retrieved CO2 columns and profiles from both 2600 and 4800 cm−1 are compared to the co-located Total Column Carbon Observing Network (TCCON) measurements and the greenhouse gas reanalysis dataset from the Copernicus Atmosphere Monitoring Service (CAMS). The amplitude of XCO2 seasonal variation derived from the NDACC-type (4800 cm−1) is closer to the TCCON measurements than that from the NDACC-type (2600 cm−1). Moreover, the NDACC-type (2600 cm−1) retrievals are strongly affected by the a priori profile. For tropospheric XCO2, the correlation coefficient between NDACC-type (4800 cm−1) and CAMS model is 0.73, which is higher than that between NDACC-type (2600 cm−1) and CAMS model (R = 0.56).

show abstract

Section: Spectral Type Nh Hh F7lmentioning

confidence: 99%

Optimizing the Atmospheric CO2 Retrieval Based on the NDACC-Type FTIR Mid-Infrared Spectra at Xianghe, China

Wang,

Zhou,

Langerock

et al. 2024

Remote Sensing

View full text Add to dashboard Cite

show abstract

“…The instruments include a high-resolution Fourier transform infrared Bruker IFS 125HR spectrometer and a solar tracker (A547N) installed on the roof. A meteorological station (Zeno, coastal environmental systems, USA) on the roof records surface pressure, temperature, relative humidity, wind speed and other meteorological information since September 2015 (Yin et al, 2020;Zhang et al, 2020;Shan et al, 2021b;Shan et al, 2021a;Wang et al, 2017;Yin et al, 2019). The spectrometer uses a liquid-nitrogen-cooled MCT detector combined with a KBr beamsplitter to record the mid-infrared spectra.…”

Section: Observing Site and Instrumentsmentioning

confidence: 99%

Retrieval of Atmospheric CFC-11 and CFC-12 from High-resolution FTIR Observations at Hefei and Comparisons with Satellite Data

Zeng

Wang

Liu

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract. Synthetic halogenated organic chlorofluorocarbons (CFCs) play an important role in stratospheric ozone depletion, and contribute signiﬁcantly to the greenhouse effect. In this work, the mid-infrared solar spectra measured by ground-based high-resolution Fourier transform infrared spectroscopy (FTIR) were used to retrieve atmospheric CFC-11 (CCl3F) and CFC-12 (CCl2F2) at Hefei, China. We implemented a new retrieval strategy, and analyzed the retrieval errors. The CFC-11 columns observed from January 2017 to December 2020 and CFC-12 columns from September 2015 to December 2020 show a similar annual decreasing trend and seasonal cycle, with an annual rate of (−0.47 % ± 0.16) % yr−1 and (−0.79 ± 0.31) % yr−1, respectively. CFC-11 total columns were higher in summer, and CFC-12 total columns were higher in summer and autumn. Both of CFC-11 and CFC-12 total columns reached the lowest in spring. The annual decreasing rate of near-surface concentration is (−0.60 ± 0.26) % y−1 for CFC-11, and (−0.81 ± 0.25) % y−1 for CFC-12. So the decline rate of CFC-11 is significantly lower than that of CFC-12. Further, FTIR data were compared with the ACE-FTS satellite data, WACCM (Whole Atmosphere Community Climate Model) data and the data from other NDACC (Network for the Detection of Atmospheric Composition Change) station. The mean relative difference between the vertical profiles observed by FTIR and ACE-FTS is (−5.6 ± 3.3) % and (4.8 ± 0.9) % for CFC-11 and CFC-12 for altitude from 5.5 to 17.5 km, respectively. The results demonstrate our FTIR data agree relatively well with the ACE-FTS satellite data. The annual decreasing rate of CFC-11 measured from ACE-FTS and calculated by WACCM are (−1.15 ± 0.22) % and (−1.68 ± 0.18) %, respectively. The interannual decreasing rates of atmospheric CFC-11 obtained from ACE-FTS and WACCM data are higher than that from FTIR observations. Also, the annual decreasing rate of CFC-12 from ACE-FTS and WACCM is (–0.85 ± 0.15) % and (–0.81 ± 0.05) %, respectively, close to the corresponding values from the FTIR measurements. Further, the total columns of CFC-11 observed at the Hefei site are very close to those at St. Petersburg station, with a mean difference of 3.63 × 1012 molec·cm-2, while the total columns of CFC-12 are 1.69 × 1014 molec·cm-2, slightly higher than those at St. Petersburg station.

show abstract

“…Figure6. Ground-based FTIR CO 2 measurements at the Hefei observatory(Shan et al, 2021). The seasonality and interannual variability are represented by the black dashed curve and black dashed line, respectively, which are fitted by using a bootstrap resampling model with a third Fourier series plus a linear function.…”

mentioning

confidence: 99%

Monitoring greenhouse gases (GHGs) in China: status and perspective

et al. 2022

Self Cite

View full text Add to dashboard Cite

Abstract. In order to establish a creditable greenhouse gas (GHG) monitoring network to support the goals of carbon peak/neutrality, it is necessary to know what we have done and what we have to do in the future. In this study, we summarize an overview of the status and perspective of GHG monitoring in China. With decades of effort, China has made a great breakthrough in GHG monitoring capacity and steadily improved the performance of homemade GHG monitoring instruments. However, most GHG monitoring studies have been research-oriented, temporal, sparse, and uncoordinated. It is suggested to take full advantage of various monitoring technologies, monitoring platforms, numerical simulations, and inventory compilation techniques to form a creditable GHG stereoscopic monitoring and assessment system at an operational level. We envisage that this system can routinely quantify GHGs on national, provincial, regional, and even individual scales with high spatiotemporal resolution and wide coverage to support low-carbon policy in China.

show abstract

Retrieval of vertical profiles and tropospheric CO₂ columns based on high-resolution FTIR over Hefei, China

Cited by 15 publications

References 58 publications

Optimizing the Atmospheric CO2 Retrieval Based on the NDACC-Type FTIR Mid-Infrared Spectra at Xianghe, China

Optimizing the Atmospheric CO2 Retrieval Based on the NDACC-Type FTIR Mid-Infrared Spectra at Xianghe, China

Retrieval of Atmospheric CFC-11 and CFC-12 from High-resolution FTIR Observations at Hefei and Comparisons with Satellite Data

Monitoring greenhouse gases (GHGs) in China: status and perspective

Contact Info

Product

Resources

About

Retrieval of vertical profiles and tropospheric CO2 columns based on high-resolution FTIR over Hefei, China

Cited by 15 publications

References 58 publications

Optimizing the Atmospheric CO2 Retrieval Based on the NDACC-Type FTIR Mid-Infrared Spectra at Xianghe, China

Optimizing the Atmospheric CO2 Retrieval Based on the NDACC-Type FTIR Mid-Infrared Spectra at Xianghe, China

Retrieval of Atmospheric CFC-11 and CFC-12 from High-resolution FTIR Observations at Hefei and Comparisons with Satellite Data

Monitoring greenhouse gases (GHGs) in China: status and perspective

Contact Info

Product

Resources

About

Retrieval of vertical profiles and tropospheric CO₂ columns based on high-resolution FTIR over Hefei, China