Water vapor represents a small but environmentally significant constituent of the atmosphere. This study retrieved
columnar water vapor (CWV) with the 939.3 nm band of a Multi-filter Rotating Shadowband Radiometer (MFRSR)
using the modified Langley technique from September 23, 2004 to June 20, 2005 at the XiangHe site.To improve the
credibility, the MFRSR results were compared with those obtained from the AERONET (AErosol RObotic NETwork)
CIMEL sun-photometer measurements, co-located at the XiangHe site, and the Moderate Resolution Imaging
Spectroradiometer (MODIS) Near-Infrared Total Precipitable Water Product (MOD05), respectively. These comparisons
show a good agreement in terms of correlation coefficients, slopes, and offsets, revealing that the accuracy of CWV
estimation using the MFRSR instrument is reliable and suitable for extended studies in northern China.
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