The main reason causing the decrease of evaporation from Erhai Lake is the increase of total cloud cover.

引起洱海水面蒸发量逐步减少的主要原因是总云量呈增多趋势。

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Comparing the distribution of total cloud cover from ISCCP with that observed from surface stations, the rationality of ISCCP-D2 data is validated.

将ISCCP总云量与地面观测总云量分布形势作了比较，证明了ISCCP -D2资料的合理性。

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Evaporation from Erhai Lake decreases with the increase of total cloud cover and relative humidity, and it increases with the increase of mean wind speed and sunshine duration.

洱海水面蒸发随着总云量和相对湿度的增加而减小，随着平均风速和日照时数的增大而增大。

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Evaporation from Erhai Lake decreases with the increase of total cloud cover and relative humidity, and it increases with the increase of mean wind speed and sunshine duration.

洱海水面蒸发随着总云量和相对湿度的增加而减小，随着平均风速和日照时数的增大而增大。

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