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首页> 外文期刊>Agricultural and Forest Meteorology >Long-term changes to incoming solar energy on the Canadian Prairie
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Long-term changes to incoming solar energy on the Canadian Prairie

机译：加拿大大草原上传入太阳能的长期变化

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摘要

Many regions of the earth experienced a steady decline in solar radiation (global dimming) from the late 1950s to the late 1980s-early 1990s and a steady brightening thereafter. To determine trends in solar energy across the agricultural region of the Canadian Prairie, we analysed incoming solar radiation, sunshine, and climate data gathered between 1951 and 2005 from 7 locations on the prairies. From the 1950s, there was a decreasing trend in annual average daily incoming solar radiation, no trend in annual average daily sunshine hours, and increasing trends in annual average daily temperature and in the annual number of precipitation/rain events. As well, we found the annual average daily incoming solar radiation decreased as the annual number of precipitation/rain events increased, but increased as the annual average precipitation intensity increased. We found the annual average daily sunshine hours decreased as the annual precipitation amount increased and as the annual average precipitation intensity increased. Thus, incoming solar radiation and sunshine responded differently to precipitation amount/events. Nevertheless, climate trends coupled with the relationship of solar radiation/sunshine to precipitation amount/events suggested that increased cloudiness played a key role in the extinction of solar radiation by the atmosphere over the past 50-60 years on the Canadian Prairie. Increasing greenhouse gas concentrations act to reduce cloudiness, whereas increasing aerosol concentrations often increase cloudiness. Specific to the Canadian Prairie, further research is needed to determine the influence of changing greenhouse gas and aerosol concentrations on cloudiness and cloud characteristics and the impact these changes would have on solar energy measured at the earth's surface..
机译：从1950年代末到1980年代末到1990年代初，地球上许多地区的太阳辐射一直在稳定下降（全球变暗），此后一直稳定地变亮。为了确定整个加拿大大草原农业地区的太阳能趋势，我们分析了从大草原上7个地点收集的1951年至2005年之间的太阳辐射，日照和气候数据。从1950年代起，年平均日入射太阳辐射呈下降趋势，年平均日照小时没有变化趋势，年平均日温度和年降水/雨事件数量呈上升趋势。同样，我们发现年平均日入射太阳辐射随着年降水/雨量事件的增加而减少，但随着年平均降水强度的增加而增加。我们发现年平均日照小时数随年降水量的增加和年均降水强度的增加而减少。因此，太阳辐射和日照对降水量/事件的响应不同。然而，气候趋势以及太阳辐射/阳光与降水量/事件的关系表明，在过去的50-60年中，加拿大草原上云量的增加在大气对太阳辐射的消灭中起着关键作用。增加温室气体浓度可减少混浊，而增加气溶胶浓度通常会增加混浊。针对加拿大大草原，需要进一步研究以确定变化的温室气体和气溶胶浓度对云量和云特征的影响，以及这些变化对地球表面测得的太阳能的影响。

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