کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6692631 501914 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Measurement and estimation of photosynthetically active radiation from 1961 to 2011 in Central China
ترجمه فارسی عنوان
اندازه گیری و برآورد تابش فعال فتوسنتزی از سالهای 1961 تا 2011 در چین مرکزی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
چکیده انگلیسی
Measurements of photosynthetically active radiation (PAR) and global solar radiation (G) at WHU, Central China during 2006-2011 were used to investigate the seasonal characteristics of PAR and PAR/G (PAR fraction). Both PAR and PAR fraction showed similar seasonal features that peaked in values during summer and reached their lowest in winter with annual mean values being 22.39 mol m−2 d−1 and 1.9 mol M J−1 respectively. By analyzing the dependence of PAR on cosine of solar zenith angle and clearness index at WHU, an efficient all-weather model was developed for estimating PAR values under various sky conditions, which also produced accepted estimations with high accuracy at Lhasa and Fukang. PAR dataset was then reconstructed from G for 1961-2011 through the new developed model. Annual mean daily PAR was about 23.12 mol m−2 d−1, there was a significant decreasing trend (11.2 mol m−2 per decade) during the last 50 years in Central China, the decreases were sharpest in summer (−24.67 mol m−2 per decade) with relatively small decreases being observed in spring. Meanwhile, results also revealed that PAR began to increase at a rate of 0.1 mol m−2 per year from 1991 to 2011, which was in consistent with variation patterns of global solar radiation in the study area. The proposed all-weather PAR model would be of vital importance for ecological modeling, atmospheric environment, agricultural processes and solar energy application.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Energy - Volume 111, November 2013, Pages 1010-1017
نویسندگان
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