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Long-term changes of precipitation in Latvia

机译：拉脱维亚降水的长期变化

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摘要

This study investigated long-term variability and trends in Latvia's annual, seasonal, monthly and daily precipitation using data from 10 meteorological stations for the period 1925-2006 and from station Riga University for the period 1850-2006. The obtained results indicate that during the 20th century a significant increase in precipitation has occurred in the cold season while the warm period showed a decreasing tendency. The annual precipitation totals showed a slight decrease, at half of the studied stations, due to opposite tendencies in cold season and warm season. The long-term trend in the annual precipitation in Riga (from 1850) was positive with large interannual and interdecadal variability. The extreme precipitation events were evaluated using a set of nine climate change indices. Of these, number of wet days, 1-day and 5-days maximum precipitation, moderate wet days and very wet days showed a well pronounced positive tendency in the cold period of the year particularly in winter. No overall long-term trend was detected in extreme precipitation in summer. As in the case of 150-year precipitation pattern, extreme precipitation exhibited cyclic fluctuations that were more pronounced than linear changes. The close correlation between North Atlantic oscillation (NAO) and extreme precipitation was found for winter season.
机译：这项研究使用了1925-2006年期间10个气象站和里加大学1850-2006年期间的数据，调查了拉脱维亚的年，季节，月度和每日降水的长期变化和趋势。获得的结果表明，在20世纪，冷季降水量显着增加，而暖期则呈下降趋势。由于寒冷季节和温暖季节的趋势相反，年降水总量在所研究站的一半处略有下降。里加年降水量的长期趋势（从1850年开始）呈正趋势，年际和年代际变化较大。使用一组九个气候变化指数评估了极端降水事件。其中，潮湿的天数，最大降水的1天和5天，中等的潮湿天和非常潮湿的天在一年的寒冷时期，特别是在冬季，表现出明显的积极趋势。在夏季极端降水中未发现总体长期趋势。与150年降水模式一样，极端降水表现出的周期性波动比线性变化更为明显。在冬季发现了北大西洋振荡（NAO）与极端降水之间的密切关系。

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  • 来源
    《Hydrology research》 |2010年第4期|P.241-252|共12页
  • 作者

    Lita Lizuma; Agrita Briede; Maris Klavins;

  • 作者单位

    Faculty of Geography and Earth Sciences,university of Latvia,Raina blv. 19,Riga LV-1586,Latvia;

    rnFaculty of Geography and Earth Sciences,university of Latvia,Raina blv. 19,Riga LV-1586,Latvia;

    rnFaculty of Geography and Earth Sciences,university of Latvia,Raina blv. 19,Riga LV-1586,Latvia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    latvia; long-term changes; precipitation indices; series homogeneity;

    机译：拉脱维亚长期变化;降水指数系列同质;

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