Recent spatial and temporal variability and trends of sunshine duration over the Iberian Peninsula from a homogenized data set
Recent spatial and temporal variability and trends of sunshine duration over the Iberian Peninsula from a homogenized data set
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DOI：
10.1029/2007jd008677
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发表时间：
2007-10
影响因子：
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通讯作者：
A. Sanchez‐Lorenzo;M. Brunetti;J. Calbó;J. Martín-Vide
中科院分区：
文献类型：
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作者：
A. Sanchez‐Lorenzo;M. Brunetti;J. Calbó;J. Martín-Vide
[1]本文介绍了一个新的数据集的日照时数在伊比利亚半岛（IP），覆盖1931-2004年期间的72个月的仪器系列的基础上的建设。特别强调的是放在质量控制，间隙填充和均质化程序。我们还制作了一个网格化版本（1° × 1°分辨率，纬度和经度）的均匀化数据集，覆盖了整个IP的84个细胞。随后，我们分析了日照时数数据的时间变化，长期趋势和空间差异的IP搜索。对整个IP和四个次区域的年度、季节和月度分辨率计算的平均系列进行了分析。我们定义的子区域使用的主成分分析应用到日照时数数据。整个IP的平均年序列的时间演变表明，从20世纪50年代到80年代初，日照时数减少，随后到20世纪末出现了积极的趋势，这与国际科学文献中描述的“全球变暗”以及随后和最近的“变亮”相匹配。IP系列最有趣的季节性显著趋势出现在夏季（1951-2004年期间，每十年-0.9%）;这一趋势受到两个次区域7月和8月的影响。此外，在所有地中海气候次区域的3月系列中，观察到每十年+2.8%至+3.8%的重要趋势。
[1] This paper describes the construction of a new data set of sunshine duration over the Iberian Peninsula (IP), based upon 72 monthly instrumental series covering the 1931–2004 period. Particular emphasis is placed upon the quality control, gap filling, and homogenization procedures. We also produced a gridded version (1° × 1° resolution, latitude, and longitude) of the homogenized data set covering the whole IP with 84 cells. We subsequently analyzed sunshine duration data in search of temporal variability, long-term trends, and spatial differences over the IP. The analyses were carried out on the mean series calculated for the whole IP and for four subregions, at annual, seasonal, and monthly resolution. We defined the subregions using a principal component analysis applied to the sunshine duration data. The temporal evolution of the mean annual series for the whole IP shows a decrease in sunshine duration from the 1950s to the early 1980s, followed by a positive trend up to the end of the 20th century, which matches the “global dimming” and the subsequent and recent “brightening” described for other regions in international scientific literature. The most interesting seasonal significant trend for the IP series was found for summer (−0.9% per decade, over the 1951–2004 period); this trend is influenced by the months of July and August in two subregions. In addition, important trends ranging from +2.8 to +3.8% per decade were observed for the March series for all Mediterranean climate subregions.