Overcast sky condition prevails on and influences the biometeorology of the tropical Andean Páramos  

作　　者：Paola MONTENEGRO-DÍAZ Rolando CELLERIALVEAR Galo CARRILLO-ROJAS 

机构地区：[1]Departamento de Recursos Hídricos y Ciencias Ambientales,Universidad de Cuenca,Cuenca,010207,Ecuador [2]Facultad de Ingeniería,Universidad de Cuenca,Cuenca,010207,Ecuador [3]Facultad de Ciencias Químicas,Universidad de Cuenca,Cuenca,010207,Ecuador

出　　处：《Journal of Mountain Science》2023年第1期78-86,共9页山地科学学报（英文）

基　　金：National Science Foundation of the United States of America through“A research network for the resilience of headwater systems and water availability for downstream communities across the Americas”;funded by the Vice-rectorate for Research of the University of Cuenca。

摘　　要：Clouds play a major role in modulating the biometeorological processes. We studied the influence of cloudiness on four biometeorological variables:daily air temperature(Tair), relative humidity(RH),reference evapotranspiration(ETr),and photosynthetic active radiation(PAR), recorded at four sites of Andean Páramos in southern Ecuador during 2.5 to 5.5 years. First, we quantified both the cloud cover percentage(Cloud%) creating cloud masks over the visible bands of Landsat 7 images and the sky condition(K_(T)) using the records of solar and extraterrestrial radiation. Second, we estimated KTfrom Cloud%. Finally, we quantified T_(air), RH, ET_(r), and PAR under clear, cloudy, and overcast K_(T) and their dependence on KT. The average Cloud% ranged between 65%–76%, and KTcorroborated the prevailing overcast sky(between 55% and 72.5% of the days) over the páramos. The proposed model performed well in the sites of calibration(R^(2)= 0.80;MBE = 0.00;RMSE = 0.05) and validation(R^(2)= 0.74;MBE =-0.07;RMSE = 0.11). The overcast sky diminished T_(air)(≤ 10℃), ET_(r)(≤ 1.6 mm day-1), and PAR(4 MJ m^(-2)day^(-1)) and increased RH(≥ 88%),while the variables showed the opposite behavior during the uncommon clear sky(≤ 5.5% of the days).Thus, mostly the dynamic of RH(R^(2)≥ 0.62), ETr(R^(2)≥ 0.85), and PAR(R2≥ 0.77) depended on K_(T). Hence,the prevailing overcast sky influenced the biometeorology of the páramos.

关 键 词：Cloudiness indicator Clearness index Satellite imagery Tropical Andes 

分 类 号：P9[天文地球—自然地理学]