Assessing the sun glint effect on the data bias of CrIS shortwave surface channels near 3.7 μm

Yin, Mengtao

doi:10.1080/01431161.2015.1125557

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…Secondly, we found that there was a sun glint effect in the short-wave range fr 2400 to 2500 cm −1 , but RTTOV did not simulate this effect, resulting in a large bias of O in these channels. Therefore, we deleted the observation samples affected by sun gl Sun glint effects are an important factor affecting the accuracy of radiometric calibrati Later, we will use cubic polynomial regression to correct the observation data [17,18 that the observation data can be used by global numerical prediction models.…”

Section: Discussionmentioning

confidence: 99%

“…Sun glint effects are an important factor affecting the accuracy of radiometric calibration. Later, we will use cubic polynomial regression to correct the observation data [17,18] so that the observation data can be used by global numerical prediction models. There are still some phenomena that we need to continue to improve in follow-up work.…”

Section: Discussionmentioning

confidence: 99%

“…The RTTOV model simulation, however, did not consider this phenomenon, which eventually caused the bias of OMB in the range of 2400-2550 cm −1 to be larger. The calculation of the sun glint angle [17,18] was as follows:…”

Section: The Bias Of Omb Global Sample Distributionmentioning

confidence: 99%

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Evaluation of FY-3E/HIRAS-II Radiometric Calibration Accuracy Based on OMB Analysis

Zhang

Yang

et al. 2022

Remote Sensing

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Before infrared hyperspectral data are used in satellite data assimilation systems or retrieval systems, the quantitative analysis of data deviation is necessary. Based on RTTOV’s (Radiative Transfer for TOVS) simulation data of FY-3E/HIRAS-II (Hyperspectral Infrared Atmospheric Sounder) and the observation data of HIRAS-II, we counted the bias of observation minus simulation (OMB) during an on-orbit test; analyzed the characteristics and reasons for the bias from the perspective of the FOV (field of view), the scanning angle of the instrument, the day and night, and the target temperature change; and analyzed the stability of the radiometric calibration accuracy. We also combined the results of the MetOp-C/IASI (infrared atmospheric sounding interferometer), a similar high-precision instrument, with the bias of OMB to compare and evaluate the FY-3E/HIRAS-II radiometric calibration accuracy. In the end, we found that the mean OMB bias of the long-wave and medium-wave infrared bands is within ±2 K, and the bias standard deviation is better than 2 K; the bias of each FOV is consistent and the bias of most channels is better than 2 K. The OMB bias of each channel is consistent with the changes in the angle of the instrument. The bias trend of long-wave and medium-wave infrared channels is more consistent with the deviation of the day and night; the bias of the short-wave infrared channel at night is lower than in the daytime. When counting the bias as the target temperature changed, the results showed that there are no obvious temperature dependencies in the long-wave and medium-wave infrared channels. This reflects that the instrument’s non-linear effect is well ordered. We further evaluated the stability of the radiometric calibration accuracy through statistics from the OMB standard deviation of each channel of FY-3E/HIRAS-II. Most channel accuracy stability values were better than 0.1 K. We calculated that IASI and HIRAS-II OMB have double differences, and the results show that the double difference in most channels is better than 1 K. It shows that the HIRAS-II and IASI observations are highly consistent. Through the statistics of the OMB bias during the on-orbit test period of FY-3E/HIRAS-II, we fully evaluated its radiometric calibration accuracy and laid the foundation for FY-3E/HIRAS-II data to be used in the retrieval application and assimilation system.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Evaluation of FY-3E/HIRAS-II Radiometric Calibration Accuracy Based on OMB Analysis

Zhang

Yang

et al. 2022

Remote Sensing

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A test of a sun glint correction method for the near-3.9 μm channels of the FengYun-3D Hyperspectral InfraRed Atmospheric Sounder (HIRAS)

Wang¹,

Niu

Zhang³

et al. 2020

Remote Sensing Letters

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An Investigation of the Fengyun-4A/B GIIRS Performance on Temperature and Humidity Retrievals

Wang

Feng

2022

Atmosphere

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The Fengyun-4A/B (FY-4A/B) geostationary satellite carries the Geostationary Interferometric Infrared Sounder (GIIRS). The instrument parameters of the GIIRS on FY-4A and FY-4B are not exactly the same, which is crucial for the atmospheric temperature and humidity measurements. The objective of this paper is to discuss the influence of spectral range on the retrieval for the FY-4A/B GIIRS. Firstly, we performed channel selection to choose the appropriate channels for retrieval. Then, the multiple cycling utilization of the physical retrieval method is proposed and conducted for improving the accuracy, and the retrieval results of FY-4A/B GIIRS are compared. Finally, perturbation analysis is performed to discuss the sensitivity of the retrieval to temperature perturbations due to the difference in spectral range between the two GIIRS. The results show the retrieval method can realize the improvement of the average accuracy by more than 0.9 K for temperature and 3.0% for humidity. As the spectral range widens, the retrieval accuracy of FY-4B GIIRS is superior to that of FY-4A GIIRS from 130 hPa to 400 hPa. Furthermore, perturbation analysis also shows the extension of the spectral range is beneficial to the retrieval. This study could offer the usefulness of current GIIRS instruments with observed on-orbit bias, and a reference for the parameter design of the subsequent instruments.

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Assessing the sun glint effect on the data bias of CrIS shortwave surface channels near 3.7 μm

Cited by 3 publications

References 15 publications

Evaluation of FY-3E/HIRAS-II Radiometric Calibration Accuracy Based on OMB Analysis

Evaluation of FY-3E/HIRAS-II Radiometric Calibration Accuracy Based on OMB Analysis

A test of a sun glint correction method for the near-3.9 μm channels of the FengYun-3D Hyperspectral InfraRed Atmospheric Sounder (HIRAS)

An Investigation of the Fengyun-4A/B GIIRS Performance on Temperature and Humidity Retrievals

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