Impact of high-resolution a priori profiles on satellite-based formaldehyde retrievals

Si Wan Kim, Vijay Natraj, Seoyoung Lee, Hyeong Ahn Kwon, Rokjin Park, Joost De Gouw, Gregory Frost, Jhoon Kim, Jochen Stutz, Michael Trainer, Catalina Tsai, Carsten Warneke

Research output: Contribution to journalArticle

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Abstract

Formaldehyde (HCHO) is either directly emitted from sources or produced during the oxidation of volatile organic compounds (VOCs) in the troposphere. It is possible to infer atmospheric HCHO concentrations using space-based observations, which may be useful for studying emissions and tropospheric chemistry at urban to global scales depending on the quality of the retrievals. In the near future, an unprecedented volume of satellite-based HCHO measurement data will be available from both geostationary and polar-orbiting platforms. Therefore, it is essential to develop retrieval methods appropriate for the next-generation satellites that measure at higher spatial and temporal resolution than the current ones. In this study, we examine the importance of fine spatial and temporal resolution a priori profile information on the retrieval by conducting approximately 45 000 radiative transfer (RT) model calculations in the Los Angeles Basin (LA Basin) megacity. Our analyses suggest that an air mass factor (AMF, a factor converting observed slant columns to vertical columns) based on fine spatial and temporal resolution a priori profiles can better capture the spatial distributions of the enhanced HCHO plumes in an urban area than the nearly constant AMFs used for current operational products by increasing the columns by ∼ 50 % in the domain average and up to 100 % at a finer scale. For this urban area, the AMF values are inversely proportional to the magnitude of the HCHO mixing ratios in the boundary layer. Using our optimized model HCHO results in the Los Angeles Basin that mimic the HCHO retrievals from future geostationary satellites, we illustrate the effectiveness of HCHO data from geostationary measurements for understanding and predicting tropospheric ozone and its precursors.

Original languageEnglish
Pages (from-to)7639-7655
Number of pages17
JournalAtmospheric Chemistry and Physics
Volume18
Issue number10
DOIs
Publication statusPublished - 2018 Jun 1

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formaldehyde
urban area
megacity
geostationary satellite
basin
mixing ratio
air mass
volatile organic compound
radiative transfer
troposphere
plume
boundary layer
spatial distribution
oxidation

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

Kim, S. W., Natraj, V., Lee, S., Kwon, H. A., Park, R., Gouw, J. D., ... Warneke, C. (2018). Impact of high-resolution a priori profiles on satellite-based formaldehyde retrievals. Atmospheric Chemistry and Physics, 18(10), 7639-7655. https://doi.org/10.5194/acp-18-7639-2018
Kim, Si Wan ; Natraj, Vijay ; Lee, Seoyoung ; Kwon, Hyeong Ahn ; Park, Rokjin ; Gouw, Joost De ; Frost, Gregory ; Kim, Jhoon ; Stutz, Jochen ; Trainer, Michael ; Tsai, Catalina ; Warneke, Carsten. / Impact of high-resolution a priori profiles on satellite-based formaldehyde retrievals. In: Atmospheric Chemistry and Physics. 2018 ; Vol. 18, No. 10. pp. 7639-7655.
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Kim, SW, Natraj, V, Lee, S, Kwon, HA, Park, R, Gouw, JD, Frost, G, Kim, J, Stutz, J, Trainer, M, Tsai, C & Warneke, C 2018, 'Impact of high-resolution a priori profiles on satellite-based formaldehyde retrievals', Atmospheric Chemistry and Physics, vol. 18, no. 10, pp. 7639-7655. https://doi.org/10.5194/acp-18-7639-2018

Impact of high-resolution a priori profiles on satellite-based formaldehyde retrievals. / Kim, Si Wan; Natraj, Vijay; Lee, Seoyoung; Kwon, Hyeong Ahn; Park, Rokjin; Gouw, Joost De; Frost, Gregory; Kim, Jhoon; Stutz, Jochen; Trainer, Michael; Tsai, Catalina; Warneke, Carsten.

In: Atmospheric Chemistry and Physics, Vol. 18, No. 10, 01.06.2018, p. 7639-7655.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Impact of high-resolution a priori profiles on satellite-based formaldehyde retrievals

AU - Kim, Si Wan

AU - Natraj, Vijay

AU - Lee, Seoyoung

AU - Kwon, Hyeong Ahn

AU - Park, Rokjin

AU - Gouw, Joost De

AU - Frost, Gregory

AU - Kim, Jhoon

AU - Stutz, Jochen

AU - Trainer, Michael

AU - Tsai, Catalina

AU - Warneke, Carsten

PY - 2018/6/1

Y1 - 2018/6/1

N2 - Formaldehyde (HCHO) is either directly emitted from sources or produced during the oxidation of volatile organic compounds (VOCs) in the troposphere. It is possible to infer atmospheric HCHO concentrations using space-based observations, which may be useful for studying emissions and tropospheric chemistry at urban to global scales depending on the quality of the retrievals. In the near future, an unprecedented volume of satellite-based HCHO measurement data will be available from both geostationary and polar-orbiting platforms. Therefore, it is essential to develop retrieval methods appropriate for the next-generation satellites that measure at higher spatial and temporal resolution than the current ones. In this study, we examine the importance of fine spatial and temporal resolution a priori profile information on the retrieval by conducting approximately 45 000 radiative transfer (RT) model calculations in the Los Angeles Basin (LA Basin) megacity. Our analyses suggest that an air mass factor (AMF, a factor converting observed slant columns to vertical columns) based on fine spatial and temporal resolution a priori profiles can better capture the spatial distributions of the enhanced HCHO plumes in an urban area than the nearly constant AMFs used for current operational products by increasing the columns by ∼ 50 % in the domain average and up to 100 % at a finer scale. For this urban area, the AMF values are inversely proportional to the magnitude of the HCHO mixing ratios in the boundary layer. Using our optimized model HCHO results in the Los Angeles Basin that mimic the HCHO retrievals from future geostationary satellites, we illustrate the effectiveness of HCHO data from geostationary measurements for understanding and predicting tropospheric ozone and its precursors.

AB - Formaldehyde (HCHO) is either directly emitted from sources or produced during the oxidation of volatile organic compounds (VOCs) in the troposphere. It is possible to infer atmospheric HCHO concentrations using space-based observations, which may be useful for studying emissions and tropospheric chemistry at urban to global scales depending on the quality of the retrievals. In the near future, an unprecedented volume of satellite-based HCHO measurement data will be available from both geostationary and polar-orbiting platforms. Therefore, it is essential to develop retrieval methods appropriate for the next-generation satellites that measure at higher spatial and temporal resolution than the current ones. In this study, we examine the importance of fine spatial and temporal resolution a priori profile information on the retrieval by conducting approximately 45 000 radiative transfer (RT) model calculations in the Los Angeles Basin (LA Basin) megacity. Our analyses suggest that an air mass factor (AMF, a factor converting observed slant columns to vertical columns) based on fine spatial and temporal resolution a priori profiles can better capture the spatial distributions of the enhanced HCHO plumes in an urban area than the nearly constant AMFs used for current operational products by increasing the columns by ∼ 50 % in the domain average and up to 100 % at a finer scale. For this urban area, the AMF values are inversely proportional to the magnitude of the HCHO mixing ratios in the boundary layer. Using our optimized model HCHO results in the Los Angeles Basin that mimic the HCHO retrievals from future geostationary satellites, we illustrate the effectiveness of HCHO data from geostationary measurements for understanding and predicting tropospheric ozone and its precursors.

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