long-term variation trend 长期变化趋势
super long term variation 超长期变化
long-term variation pattern 长期变化规律
long-term variation features 长期变化特征
sea ice long-term variation 海冰长期变化
effect of long-term variation 长期变化的影响
character of long-term variation 长期变化特征
By using statistical analysis on cloud cover,we found that low cloud cover increased in northwest China and both total cloud cover and low cloud cover decreased in other areas. At last,the reasons for long-term variation of radiation were discussed.
近40年来散射辐射年曝辐量除东北无明显变化外,南疆和青藏高原有降低趋势,而南方有略微增加趋势;通过对云量的分析发现西北地区低云量略增加,而其他地区低云量和总云量都有不同程度的下降趋势,最后对造成辐射长期变化的原因作了初步讨论。
参考来源 - 近40年来中国太阳辐射区域特征的初步研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Moreover, such a long-term variation is related to the low-frequency variability of the Pacific sea-air systems, and the causes are sophisticated.
而且， 这种长期变化与太平洋海气系统成员的低频变化有相关性， 其变化成因是复杂的。
The long-term variation characteristics of annual mean air temperature, annual mean maximum and minimum air temperature and mean daily range from 1932 to 2002 in Lanzhou are analyzed.
分析了兰州1932～ 2 0 0 2年年平均气温、年平均最高和最低气温及年平均气温日较差的气候变化特征。
Natural variation alone in the chaotic climate system would produce such a slowing every eight decades, even with the long-term warming trend seen.
自然气候变化的混沌系统单每八十年会出现这样的变缓趋势，即使长期变暖趋势出现。
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