The data must be then undergo quality assurance, for example what type of instrument was used, what was the precise location and height of the recording, this type of information is known as metadata – or data about data, and is crucial to construction a homogenous climate time series. Data rescue is the term used to describe the process of cataloguing, scanning and keying in data from old climate records to make it available for use. These early records are particularly valuable, but for the data to be used it must be ‘rescued’. The resulting dataset provides the second-longest regional precipitation archive in the British and Ireland.Īll rainfall data since 1941 has been digitised and is already available for analysis, data prior to 1941 for the most part is still in the original paper format. Such long-term series are critical for understanding past and emerging changes to the precipitation regime and the hydrological cycle. Īn Island of Ireland Precipitation (IIP) series covering the period 1850-2010 for 25 locations has been constructed by researchers at Maynooth University and Met Éireann. EN ISO 15927-3:2009 methodology will be of assistance to regulators elsewhere in adopting this methodology in their own jurisdictions. It is hoped that the detailed explanation of the application of the I.S. The new map supersedes the previous map published by Met Éireann in 2010 and should be adopted by decision makers. EN ISO 15927-3:2009 and based on hourly data from the latest climate normal 1991 – 2020 has been produced by Met Éireann for use in building design to enhance resilience in support of climate change adaptation in Ireland. The impacts of rain on buildings depend on the rain intensity and duration, wind speed and wind direction.įor the first time, the map of Driving Rain Index for Vertical Surfaces according to I.S. Rain penetration through gaps and cracks in building façades and around the edges of doors and windows usually occurs after short periods of heavy rainfall accompanied by winds. Wind-driven rain against a wall may be partially absorbed or penetrate through cracks in the wall, therefore increasing the risk of damage to the building fabric. However, there is variation between sites of course, for example at stations on higher ground (that is, highest in counties Kerry and Wicklow), rainfall is recorded every one in 3.5 to 4 hours.ĭriving Rain Index for Vertical-Surfaces I.S. For example, the general impression is that it rains quite a lot of the time in Ireland, but only one out of five hourly observations will report measurable rainfall. From this observational dataset, and others, analysis is completed to give details of the Rainfall Climate of Ireland. Since then the network has expanded further, there are now just under 500 rain gauge locations in the country.įrom these rain gauges, Met Éireann has recorded and stored nearly 9.5 million individual hourly rainfall measurements into the National Climate Database between 19. By the early 20th century there were over 100 locations measuring rainfall, by the time the Irish Meteorological Service was formed in 1936 the number of rain gauges was over 200. From the mid 19th century the number of stations increased and some standardisation of observations took places in line with international developments. ![]() In the first half of the 19th century readings were taken at Birr Castle (1845), Markree Castle (1824), the Phoenix Park (1829) and Trinity College, Dublin (1838). The history of organised weather observations in Ireland goes back to the late 1700s with Observatories in Dunsink (1787) and Armagh (1790). Historical observations are of particular value since an observation once made in time cannot be retaken, and if observations are not taken we have no way of directly knowing what the past weather and climate were like. ![]() The value of high quality observations to the meteorological and climatological scientific communities cannot be overstated. Rainfall is a key indicator of changes in the climate, measurements and analysis of rainfall are essential for assessing the effects of climate change on the water cycle, water balance and for flood mitigation. Peer-reviewed journal articles by Met Éireann staff members Past Weather Agrometeorological Bulletins
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