975 resultados para Precipitation climatology
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Report produced by the The Department of Agriculture and Land Stewardship, Climatology Bureau.
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Report produced by the The Department of Agriculture and Land Stewardship, Climatology Bureau.
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Report produced by the The Department of Agriculture and Land Stewardship, Climatology Bureau.
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Report produced by the The Department of Agriculture and Land Stewardship, Climatology Bureau.
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Report produced by the The Department of Agriculture and Land Stewardship, Climatology Bureau.
Resumo:
Report produced by the The Department of Agriculture and Land Stewardship, Climatology Bureau.
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Report produced by the The Department of Agriculture and Land Stewardship, Climatology Bureau.
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Report produced by the The Department of Agriculture and Land Stewardship, Climatology Bureau.
Resumo:
Report produced by the The Department of Agriculture and Land Stewardship, Climatology Bureau.
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Report produced by the The Department of Agriculture and Land Stewardship, Climatology Bureau.
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Report produced by the The Department of Agriculture and Land Stewardship, Climatology Bureau.
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Report produced by the The Department of Agriculture and Land Stewardship, Climatology Bureau.
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The aim of this paper is to quantitatively characterize the climatology of daily precipitation indices in Catalonia (northeastern Iberian Peninsula) from 1951 to 2003. This work has been performed analyzing a subset of the ETCCDI (Expert Team on Climate Change Detection and Indices) precipitation indices calculated from a new interpolated dataset of daily precipitation, namely SPAIN02, regular at 0.2° horizontal resolution (around 20 km) and from two high-quality stations: the Ebro and Fabra observatories. Using a jack-knife technique, we have found that the sampling error of the SPAIN02 regional averaged is relatively low. The trend analysis has been implemented using a Circular Block Bootstrap procedure applicable to non-normal distributions and autocorrelated series. A running trend analysis has been applied to analyze the trend persistence. No general trends at a regional scale are observed, considering the annual or the seasonal regional averaged series of all the indices for all the time windows considered. Only the consecutive dry days index (CDD) at annual scale shows a locally coherent spatial trend pattern; around 30% of the Catalonia area has experienced an increase of around 2¿3 days decade¿1. The Ebro and Fabra observatories show a similar CDD trend, mainly due to the summer contribution. Besides this, a significant decrease in total precipitation (around ¿10 mm decade¿1) and in the index "highest precipitation amount in five-day period" (RX5DAY, around ¿5 mm decade¿1), have been found in summer for the Ebro observatory.
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Global climate change and its impacts are being increasingly studied and precipitation trends are one of the measures of quantifying climate change especially in the tropics. This study uses daily rainfall data to determine if there are changes in the long-term trends in rainfall variability in the East Coast Mountains of Mauritius during the last few decades, and to investigate the factors influencing the trends in the inter-annual to inter-decadal rainfall variability. Statistical modelling has been used to investigate the trends in total seasonal rainfall, the number of rain days and the mean amount of rain per rainy days and the local, regional and large-scale factors that affect them on inter-annual to inter-decadal time scales. The strongest inter-decadal trend was found in the number of rain days for both rainfall seasons, and the other variables were found to have weak or insignificant trends. Both local factors, such as the surrounding sea surface temperatures and large-scale phenomena such as Indian Monsoon and the El Niño Southern Oscillation were found to influence rainfall patterns.
