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- Title
Comprehensive Evaluation and Comparison of AIRS, VASS, and VIRR Water Vapor Products Over Antarctica.
- Authors
Fan, Rongfeng; Zeng, Zhaoliang; Wang, Xin; Zhang, Lei; Cheng, Wei; Ding, Minghu
- Abstract
The detection capability of the water vapor mixing ratio (q) and total precipitable water vapor (PWV) products of the Atmospheric Infrared Sounder (AIRS), the Atmospheric Vertical Sounder System (VASS), and Visible and Infrared Radiometer (VIRR) in Antarctica is unclear due to the harsh environment and the scarcity of ground‐based stations. This study compares these products with data from nine radiosonde stations and 10 Global Navigation Satellite Systems Stations and evaluates them using the CCHZ‐DISO method. In the low atmosphere, the average wet bias of about 22% of VASS q is significantly greater than that of AIRS q (<15%), and the dry bias of AIRS is gradually corrected with increasing cloudiness, but the trend of exacerbated wet bias at 700 hPa requires attention. Meanwhile, VASS should optimize the inversion principle in the presence of clouds and refine the utilization weights of the channels heavily influenced by clouds under different cloud fraction conditions. Furthermore, when the atmospheric pressure is less than 500 hPa, VASS q exhibits a significant wet bias, and these data should be used cautiously. Both AIRS and VIRR detect PWV well in coastal areas, but VIRR PWV is significantly overestimated in the dry ice sheet plateau region. The CCHZ‐DISO value intuitively reveals that AIRS outperforms VASS and VIRR in both q and PWV detection. The findings of this study contribute to a more comprehensive understanding of the detection capability of the above satellite water vapor products to promote the wider application of satellite data in the Antarctic region. Plain Language Summary: Antarctic water vapor has an important impact on global climate change, and satellites are an effective tool for comprehensively observing water vapor in the Antarctic continent. The detection capability of their water vapor products needs to be assessed. This study provides a more comprehensive assessment of the water vapor products of Atmospheric Infrared Sounder (AIRS), the Atmospheric Vertical Sounder System (VASS), and Visible and Infrared Radiometer (VIRR) and compares them using the latest CCHZ‐DISO method. The results show that AIRS, which has a hyperspectral resolution, has a better ability to detect water vapor, significantly greater than the other two instruments. This study also reveals the bias of AIRS in detecting water vapor in the lower atmosphere, the insensitivity of VASS at low water vapor content, the overestimation of VIRR in the Antarctic interior, and the inadequacy of the inversion algorithm of VASS in the presence of clouds, which will be of great help to the subsequent improvement of the satellite observation capability of Antarctic water vapor and help to understand further the important role played by Antarctic water vapor in global warming. Key Points: Long‐term, multisite, multivapor parameter comprehensive assessment of Atmospheric Infrared Sounder (AIRS), Atmospheric Vertical Sounder System (VASS), and Visible and Infrared Radiometer (VIRR) water vapor products over AntarcticaUsing the CCHZ‐DISO method, a comprehensive comparison of satellite water vapor products is performedCompared to VASS and VIRR, the greater accuracy of AIRS reflects the advantage of hyperspectral resolution in water vapor remote sensing
- Subjects
ANTARCTICA; ATMOSPHERIC water vapor measurement; WATER vapor; ATMOSPHERIC water vapor; GLOBAL Positioning System; PRECIPITABLE water; ATMOSPHERIC boundary layer
- Publication
Journal of Geophysical Research. Atmospheres, 2023, Vol 128, Issue 23, p1
- ISSN
2169-897X
- Publication type
Article
- DOI
10.1029/2023JD039221