Objective To create a homogeneous dataset, consisting of monthly values ofair temperature, precipitation, air pressure, cloud cover andnumber of days with snow cover from 70 climatological stations inthe North Atlantic area (50º N--80º N, 40º E--60º W)covering the period 1890 - 1990.Instrumental records covering the most recent 100-300 years arebeing digitized and will go through various types of qualitycontrol procedures in order to remove sporadic errors such asmiscalculations and typing errors.The time series will be homogeniety tested using a varity andstatistical procedures. The first step will include an internalrelative homogeneity test which will detect changes in formula,time of observation, coding system etc. Next step will include aspatial relative homogeneity test, which will detect relocationof stations, change of instruments etc. The third step willinclude a spatial absolute homogeneity test, which should be ableto detect inhomogeneities related to nation-wide changes in theobservational networks.The project will also develop a standardized metadata concept forstoring and retrieving information about relocations, change offormula, change of instrument etc.Adjustment of series due to detected inhomogeneities will be donewhen there is physical evidence of a non-climatic change in thestation history or metadata-files. The adjustment figures willbe verified, if possible, by using parallel observations from anearby station or parallel observations of related climaticelements from the same station or by using parallel series ofproxydata from data sparse regions.The NACD-project will compare the dataset with existingsingle-element datasets which have global coverage. Comparisonshave been planned for gridded sea surface temperature data, butalso comparison with cloud- and snow cover datasets will beconsidered.Another task is to merge the NACD with selected historical timeseries reaching back several hundred years before systematicinstrumental observations began. This task will serve thepurpose of describing the long-term preindustrial naturalvariability in the North Atlantic region.The homogenous dataset will be analyzed with respect to regionalclimatic trends of natural and/or anthropogenic origin. Finallythe NACD will be available for validation of output from climatemodels and could also be used for model-based statisticalprojections of the future climate. Programme(s) FP3-ENV 1C - Specific research and technological development programme (EEC) in the field of the environment, 1990-1994 Topic(s) 0102 - Anthropogenic climate change Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator Danish Meteorological Institute Address 100,lyngbyvej 2100 København ø Denmark See on map EU contribution € 0,00 Participants (7) Sort alphabetically Sort by EU Contribution Expand all Collapse all Det Norske Meteorologiske Institutt Norway EU contribution € 0,00 Address 40,niels henrik abels vei 0260 Oslo See on map Institut Royal Météorologique de Belgique Belgium EU contribution € 0,00 Address 3,avenue circulaire 1180 Bruxelles See on map Meteorological Service Ireland EU contribution € 0,00 Address Glasnevin hill 9 Dublin See on map ROYAL NETHERLANDS METEOROLOGICAL INSTITUTE Netherlands EU contribution € 0,00 Address 10,wilhelminalaan 10 3730 AE De bilt See on map SECRETARY OF STATE FOR DEFENCE - MINISTRY OF DEFENCE United Kingdom EU contribution € 0,00 Address London road, sutton house room sg/12 RG12 2SZ Bracknell See on map SWEDISH METEOROLOGICAL AND HYDROLOGICAL INSTITUTE Sweden EU contribution € 0,00 Address Folkborgsvaegen 1 601 76 Norrkoeping See on map VEDURSTOFA ISLANDS Iceland EU contribution € 0,00 Address Bustadavegur Reykjavik See on map Links Website Opens in new window