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A field experiment was performed during 1 April–30 September 2001 in the southeast Tengger Desert in Northern China to measure the solar radiant flux by a solar direct radiometer and a multi-wavelength sun-photometer. The observation and research results are as follows. On fine days, dust aerosols attenuate the direct solar radiant flux by 2.6–47.0%, with an average of 16.9%. On dusty days, dust aerosols...
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