Preliminary Assessment and Verification of the Langley Plots Calibration of the Sun Photometer at Mt Foyeding Observatory, Beijing
An assessment and verification of the Langley calibration method of the Sun photometer at Mt Foyeding (MFYD) Observatory in Beijing was performed. We explored whether the Langley plot calibration is practicable for this mountainous site by analyzing the aerosol climatology and carrying out a case st...
| Main Authors: | , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-09-01
|
| Series: | Remote Sensing |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2072-4292/14/17/4321 |
| _version_ | 1797493307149910016 |
|---|---|
| author | Yu Zheng Huizheng Che Ke Gui Xiangao Xia Hujia Zhao Lei Li Lei Zhang Xinglu Zhang Hengheng Zhao Yuanxin Liang Hong Wang Yaqiang Wang Xiaoye Zhang |
| author_facet | Yu Zheng Huizheng Che Ke Gui Xiangao Xia Hujia Zhao Lei Li Lei Zhang Xinglu Zhang Hengheng Zhao Yuanxin Liang Hong Wang Yaqiang Wang Xiaoye Zhang |
| author_sort | Yu Zheng |
| collection | DOAJ |
| description | An assessment and verification of the Langley calibration method of the Sun photometer at Mt Foyeding (MFYD) Observatory in Beijing was performed. We explored whether the Langley plot calibration is practicable for this mountainous site by analyzing the aerosol climatology and carrying out a case study. Then, the aerosol optical depth (AOD) results were verified under the reference of AERONET AOD. The results showed that satisfactory atmospheric conditions are present on winter mornings, characterized by a smaller average AOD (~0.09–0.14) and a lower range ratio (~36.97–63.38%) than in the afternoons and over a whole day. The six days selected as the case study all showed stable atmospheric conditions characterized by daily average triplets of <2% for all wavelengths. The residual sum of squares for <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>V</mi><mrow><mn>0</mn><mi>λ</mi></mrow></msub></mrow></semantics></math></inline-formula> at all wavelengths was <0.0002 and the residual standard deviation was <0.2%. A large improvement was found in the linear regression at morning relative to the statistics obtained over the whole day, when the coefficient of determination and residual standard deviation were promoted by 0.22–2.90% and ~2.76–23.32, respectively. The final <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>V</mi><mrow><mn>0</mn><mi>λ</mi></mrow></msub></mrow></semantics></math></inline-formula> value was derived from 31 days of observation and the deviations from the reference <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>V</mi><mrow><mn>0</mn><mi>λ</mi></mrow></msub></mrow></semantics></math></inline-formula> were about −1.69, −1.29, −0.81, −0.42, −0.34, −0.22, −0.63 and −0.36% at 340, 380, 440, 500, 675, 870, 1020 and 1640 nm, respectively. The regression analysis of the AOD validation showed a perfect AOD performance, with 100% of the retrievals lying within the expected error (0.05 ± 10%) from 380 to 1640 nm and 99.99% for the 340 nm band. Good AOD agreement (correlation coefficients > 0.998) and residual standard deviation values ranging from ~0.006 to 0.011 were observed, with the relative mean bias varying from 0.999 to 1.066. The mean biases were concentrated within ±0.02 for the ultraviolet bands and within ±0.01 for the other bands; therefore, the results of this preliminary assessment and verification indicated that the Langley plots method is suitable for photometer calibration at the MFYD Observatory. |
| first_indexed | 2024-03-10T01:18:08Z |
| format | Article |
| id | doaj.art-760a66df34f043c799b059030a097939 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T01:18:08Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-760a66df34f043c799b059030a0979392023-11-23T14:04:42ZengMDPI AGRemote Sensing2072-42922022-09-011417432110.3390/rs14174321Preliminary Assessment and Verification of the Langley Plots Calibration of the Sun Photometer at Mt Foyeding Observatory, BeijingYu Zheng0Huizheng Che1Ke Gui2Xiangao Xia3Hujia Zhao4Lei Li5Lei Zhang6Xinglu Zhang7Hengheng Zhao8Yuanxin Liang9Hong Wang10Yaqiang Wang11Xiaoye Zhang12State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry, Institute of Atmospheric Composition and Environmental Meteorology, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, ChinaState Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry, Institute of Atmospheric Composition and Environmental Meteorology, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, ChinaState Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry, Institute of Atmospheric Composition and Environmental Meteorology, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, ChinaLAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166, ChinaState Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry, Institute of Atmospheric Composition and Environmental Meteorology, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, ChinaState Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry, Institute of Atmospheric Composition and Environmental Meteorology, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, ChinaState Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry, Institute of Atmospheric Composition and Environmental Meteorology, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, ChinaState Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry, Institute of Atmospheric Composition and Environmental Meteorology, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, ChinaState Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry, Institute of Atmospheric Composition and Environmental Meteorology, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, ChinaState Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry, Institute of Atmospheric Composition and Environmental Meteorology, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, ChinaState Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry, Institute of Atmospheric Composition and Environmental Meteorology, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, ChinaState Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry, Institute of Atmospheric Composition and Environmental Meteorology, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100081, ChinaAn assessment and verification of the Langley calibration method of the Sun photometer at Mt Foyeding (MFYD) Observatory in Beijing was performed. We explored whether the Langley plot calibration is practicable for this mountainous site by analyzing the aerosol climatology and carrying out a case study. Then, the aerosol optical depth (AOD) results were verified under the reference of AERONET AOD. The results showed that satisfactory atmospheric conditions are present on winter mornings, characterized by a smaller average AOD (~0.09–0.14) and a lower range ratio (~36.97–63.38%) than in the afternoons and over a whole day. The six days selected as the case study all showed stable atmospheric conditions characterized by daily average triplets of <2% for all wavelengths. The residual sum of squares for <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>V</mi><mrow><mn>0</mn><mi>λ</mi></mrow></msub></mrow></semantics></math></inline-formula> at all wavelengths was <0.0002 and the residual standard deviation was <0.2%. A large improvement was found in the linear regression at morning relative to the statistics obtained over the whole day, when the coefficient of determination and residual standard deviation were promoted by 0.22–2.90% and ~2.76–23.32, respectively. The final <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>V</mi><mrow><mn>0</mn><mi>λ</mi></mrow></msub></mrow></semantics></math></inline-formula> value was derived from 31 days of observation and the deviations from the reference <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>V</mi><mrow><mn>0</mn><mi>λ</mi></mrow></msub></mrow></semantics></math></inline-formula> were about −1.69, −1.29, −0.81, −0.42, −0.34, −0.22, −0.63 and −0.36% at 340, 380, 440, 500, 675, 870, 1020 and 1640 nm, respectively. The regression analysis of the AOD validation showed a perfect AOD performance, with 100% of the retrievals lying within the expected error (0.05 ± 10%) from 380 to 1640 nm and 99.99% for the 340 nm band. Good AOD agreement (correlation coefficients > 0.998) and residual standard deviation values ranging from ~0.006 to 0.011 were observed, with the relative mean bias varying from 0.999 to 1.066. The mean biases were concentrated within ±0.02 for the ultraviolet bands and within ±0.01 for the other bands; therefore, the results of this preliminary assessment and verification indicated that the Langley plots method is suitable for photometer calibration at the MFYD Observatory.https://www.mdpi.com/2072-4292/14/17/4321Sun photometerLangley calibrationcalibration assessmentaerosol optical depth verificationMt. Foyeding ObservatoryBeijing |
| spellingShingle | Yu Zheng Huizheng Che Ke Gui Xiangao Xia Hujia Zhao Lei Li Lei Zhang Xinglu Zhang Hengheng Zhao Yuanxin Liang Hong Wang Yaqiang Wang Xiaoye Zhang Preliminary Assessment and Verification of the Langley Plots Calibration of the Sun Photometer at Mt Foyeding Observatory, Beijing Remote Sensing Sun photometer Langley calibration calibration assessment aerosol optical depth verification Mt. Foyeding Observatory Beijing |
| title | Preliminary Assessment and Verification of the Langley Plots Calibration of the Sun Photometer at Mt Foyeding Observatory, Beijing |
| title_full | Preliminary Assessment and Verification of the Langley Plots Calibration of the Sun Photometer at Mt Foyeding Observatory, Beijing |
| title_fullStr | Preliminary Assessment and Verification of the Langley Plots Calibration of the Sun Photometer at Mt Foyeding Observatory, Beijing |
| title_full_unstemmed | Preliminary Assessment and Verification of the Langley Plots Calibration of the Sun Photometer at Mt Foyeding Observatory, Beijing |
| title_short | Preliminary Assessment and Verification of the Langley Plots Calibration of the Sun Photometer at Mt Foyeding Observatory, Beijing |
| title_sort | preliminary assessment and verification of the langley plots calibration of the sun photometer at mt foyeding observatory beijing |
| topic | Sun photometer Langley calibration calibration assessment aerosol optical depth verification Mt. Foyeding Observatory Beijing |
| url | https://www.mdpi.com/2072-4292/14/17/4321 |
| work_keys_str_mv | AT yuzheng preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing AT huizhengche preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing AT kegui preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing AT xiangaoxia preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing AT hujiazhao preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing AT leili preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing AT leizhang preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing AT xingluzhang preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing AT henghengzhao preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing AT yuanxinliang preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing AT hongwang preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing AT yaqiangwang preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing AT xiaoyezhang preliminaryassessmentandverificationofthelangleyplotscalibrationofthesunphotometeratmtfoyedingobservatorybeijing |