Temperature and precipitation variability in Italy in the last two centuries from homogenised instrumental time series
Temperature and precipitation variability in Italy in the last two centuries from homogenised instrumental time series
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DOI：
10.1002/joc.1251
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发表时间：
2006-03-15
期刊：
影响因子：
--
通讯作者：
Nannia, T
中科院分区：
文献类型：
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作者：
Brunetti, M;Maugeri, M;Nannia, T
意大利的月气温（平均、最高和最低）和降水长期数据集得到更新和全面修订。台站密度和元数据的可用性大大提高，而且这些系列都经过了详细的质量控制和均质化程序。详细描述了数据均质化。影响原始数据的偏差通过研究应用于该系列的平均调整的时间演变来量化，并根据台站历史进行检查。结果强调了气候变化研究中同质化的重要性。最后的数据集聚类成气候均匀的地区，通过主成分分析。年度和季节性趋势分析进行区域平均系列和平均意大利系列。结果表明，意大利各地每世纪平均气温约为1 K，呈积极趋势;最低气温一般高于最高气温。趋势分析的逐步应用表明，在过去50年中，情况正好相反;最高温度的趋势强于最低温度的趋势。这导致了一个负面的趋势，在过去的50年里，每天的温度范围已成为积极的。降水量呈下降趋势，即使很低，也很少显著，每年的负趋势仅为每世纪5%。版权所有（c）2006皇家气象学会。
The Italian monthly temperature (mean, maximum and minimum) and precipitation secular data set was updated and completely revised. Station density and metadata availability were greatly improved and the series were subjected to a detailed quality control and homogenisation procedure. The data homogenisation is described in detail. The bias affecting original data is quantified by Studying the temporal evolution of the mean adjustments applied to the series and examined in the light of the stations history. The results stress the importance of homogenisation in climate change studies. The final data set was clustered into climatically homogeneous regions by means of a Principal Component Analysis. Yearly and seasonal trend analyses were performed both on regional average series and on the mean Italian series. The results hi-hlight a positive trend for mean temperature of about 1 K per century all over Italy; it is generally higher for minimum temperature than for the maximum temperature. The progressive application of trend analysis shows that, in the last 50 years, behaviour is the opposite; the maximum temperature trend being stronger than that of the minimum temperature. This has led to a negative trend in the daily temperature range that for the last 50 years has become positive. Precipitation shows a decreasing tendency, even if low and rarely significant, the negative trend being only 5% per century on a yearly basis. Copyright (c) 2006 Royal Meteorological Society.