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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Observed trends in indices of daily and extreme temperature and precipitation for the countries of the western Indian Ocean, 1961-2008
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Observed trends in indices of daily and extreme temperature and precipitation for the countries of the western Indian Ocean, 1961-2008

机译：1961-2008年西印度洋国家每日和极端温度与降水指数的观测趋势

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摘要

A workshop on climate change indices was held at the Mauritius Meteorological Services in October 2009 to produce the first analysis of climate trends for the countries of the western Indian Ocean. Scientists brought their long-term daily temperature and precipitation for a careful assessment of data quality and homogeneity, and for the preparation of climate change indices. This paper reports on the trends in daily and extreme temperature and precipitation indices for 1961-2008. The results indicate a definitive warming of surface air temperature at land stations. Annual means of the daytime and nighttime temperatures have increased at a similar rate, leading to no discernible change in the diurnal temperature range. Significant increasing trends were found in the frequency of warm days and warm nights, while decreasing trends were observed in the frequency of cold days and cold nights. Moreover, it seems that the warm extremes have changed more than the cold extremes in the western Indian Ocean region. Trends in precipitation indices are generally weak and show less spatial coherence. Regionally, a significant decrease was found in the annual total rainfall for the past 48 years. The results also show some increase in consecutive dry days, no change in daily intensity and consecutive wet days, and a decrease in extreme precipitation events. Temperature indices are highly correlated with sea surface temperatures of the region, whereas weak correlations are found with the precipitation indices.
机译：2009年10月，在毛里求斯气象局举办了一次气候变化指数讲习班，以对印度洋西部国家的气候趋势进行首次分析。科学家带来了他们长期的每日温度和降水，以仔细评估数据质量和均一性，并编制气候变化指数。本文报告了1961-2008年每日和极端温度和降水指数的趋势。结果表明，地面站的地面气温确实出现了变暖。白天和夜间温度的年度平均值以相似的速率增加，导致昼夜温度范围没有明显变化。在暖天和暖夜的频率中发现显着增加的趋势，而在冷天和冷夜的频率中观察到减少的趋势。而且，似乎在印度洋西部地区，极端天气的变化比极端天气的变化大。降水指数的趋势通常较弱，并且空间连贯性较低。从地区来看，过去48年的年总降雨量明显减少。结果还表明，连续的干旱日有所增加，日强度和连续的湿日无变化，极端降水事件减少。温度指数与该地区的海表温度高度相关，而与降水指数的相关性较弱。

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