More frequent cloud-free sky and less surface solar radiation in China from 1955 to 2000

Details More frequent cloud-free sky and less surface solar radiation in China from 1955 to 2000 More frequent cloud-free sky and less surface solar radiation in China from 1955 to 2000

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3301812q&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 1, CiteID L01812

Physics

52

Atmospheric Composition And Structure: Cloud/Radiation Interaction, Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513)

Scientific paper

Newly available data from extended weather stations and time period reveal that much of China has experienced significant decreases in cloud cover over the last half of the Twentieth century. This conclusion is supported by the analysis of the more reliably observed frequency of cloud-free sky and overcast sky. The total cloud cover and low cloud cover have decreased 0.88% and 0.33% per decade, respectively, and cloud-free days have increased 0.60% and overcast days decreased 0.78% per decade in China from 1954-2001. Meanwhile, both solar radiation and pan evaporation have decreased in China, with solar radiation decreasing 3.1 W/m2 and pan evaporation decreasing 39 mm per decade. Combining these results with findings of previous studies, we speculated that increased air pollution may have produced a fog-like haze that reflected/absorbed radiation from the sun and resulted in less solar radiation reaching the surface, despite concurrent increasing trends in cloud-free sky over China.

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