Field Calibration of Sunphotometer in Dunhuang Test Site

Dong, 黄冬 Huang; Xin, 李新 Li; Yan-na, 张艳娜 Zhang; Quan, 张权 Zhang; Xiaobing, 郑小兵 Zheng; Ling, 孙凌 Sun

doi:10.3788/gzxb20194809.0912003

Cited by 2 publications

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“…A solar photometer is often used outdoors and may consequently be affected by the natural environment, and, in addition, it is also affected by loss problems, such as the attenuation of filter deterioration that is caused by air pollutants or humidity, which will, in turn, lead to changes in the calibration constant of the solar photometer [12][13][14][15]. The change of the calibration constant is the source of the maximum uncertainty of the aerosol retrieval result of a sun photometer.…”

Section: Introductionmentioning

confidence: 99%

“…Unstable transit for a long time may also affect the stability of the instruments. At the same time, it is not easy to ascertain the status of the photometers after returning to China, which is another problem [14,23]. It is therefore vital to find a suitable calibration station in China, and, for this reason, we analyzed the conditions of the calibration station required by the Langley plot method to select a station that meets the calibration conditions in order to provide a reference for the calibration of master sun photometers in China.…”

Section: Introductionmentioning

confidence: 99%

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Screening Approach of the Langley Calibration Station for Sun Photometers in China

Xun,

Liu,

et al. 2023

Atmosphere

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A sun photometer is a type of photometer that points at the sun, and it has been playing an increasingly important role in characterizing aerosols across the world. As long as the solar photometer is accurately calibrated, the optical thickness of the aerosol can be obtained from the measured value of this device. When the calibration of a single instrument is not accurate, the inversion quantity varies greatly. The calibration constant of the sun photometer changes during its use process; thus, calibrations are frequently needed in order to ensure the accuracy of the measured value. The calibration constant of the solar photometer is usually determined using the Langley method. Internationally, AERONET has two Langley calibration stations: the Mauna Loa observatory in the United States and the Izaña observatory in Spain. So far, the International Comparison and Calibration System has been established in Beijing, similar to AERONET at GSFC, but the Langley calibration system has not yet been established. Therefore, it is necessary to select a suitable calibration station in China. This paper studies the requirements of the calibration station using the Langley method. We used long-term records of satellite-derived measurements and survey data belonging to the aerosol optical thickness data of SNPP/VIIRS, CERES, MERRA-2, etc., in order to gain a better understanding of whether these stations are suitable for calibration. From the existing astronomical observation stations, meteorological stations, and the Sun–Sky Radiometer Observation Network (SONET) observation stations in China, the qualified stations were selected. According to the statistical data from the Ali observatory, the monthly average of clear sky is 20.21 days, and it is always greater than 15 days. The monthly average of aerosol is not more than 0.15 and is less than 0.3. We believe that the atmosphere above the Ali observatory is stable, and the results show that the Ali observatory has excellent weather conditions. This study can provide a selection of calibration sites for solar photometer calibrations in China that may need to be further characterized and evaluated, and at the same time provide a method to exclude unsuitable calibration sites.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%