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Zawartość zarchiwizowana w dniu 2019-03-15

THE RECONSTITUTION OF EUROPEAN CLIMATE ON DECADAL AND SHORTER TIME SCALES

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THE AIM OF THIS PROJECT IS TO PROVIDE A RELIABLE CLIMATIC HISTORY FOR EUROPE FOR THE PERIOD 800-1800 AD ON DECADAL AND SHORTER TIMESCALES.BOTH HISTORICAL (DOCUMENTARY) AND PROXY DATA WILL BE USED FOR CLIMATE RECONSTRUCTION,SUPPLEMENTED BY INSTRUMENTAL DATA WHERE POSSIBLE.INSTRUMENTAL DATA WILL ALSO BE USED IN THE INTERPRETATION OF PROXY DATA.NEW MATERIAL WILL BE COLLECTED AND OLD MATERIAL WILL BE RE-EVALUATED.RECONSTRUCTIONS WILL BE A SYNTHESIS OF INFORMATION FROM A VARIETY OF DATA SOURCES.THE STARTING POINT 800 AD HAS BEEN CHOSEN BECAUSE IT MARKS THE APPROXIMATE BEGINNING OF THE MEDIEVAL WARM EPOCH,A TIME OF WARM CLIMATE OVER MUCH OF THE NORTHERN HEMISPHERE AND PARTICULARLY OVER THE NORTH ATLANTIC-EUROPEAN SECTOR. THE EARLY CENTURIES OF THE PRESENT MILLENNIUM SAW A COMPLEX DECLINE TOWARDS COLDER CONDITION BEGINNING ABOUT 1200 AD (OUT LATER IN SOME REGIONS ACCOMPANIED BY A DRAMATIC INCREASE IN THE EXTENT OF NORTH ATLANTIC SEA-ICE.THIS COOLING CULMINATED IN THE CLIMAX OF THE LITTLE ICE AGE, 1550-1700 AD.TWO DISTINCT BUT RELATED AIMS WILL BE PURSUED: RECONSTRUCTIONS ON THE DECADAL TIMESCALE,AND RECONSTRUCTIONS ON THE SEASONAL TIMESCALE. FOR THE FORMER IT IS PLANNED TO PRODUCE REVISED DECADAL TEMPERATURE AND PRECIPITATION TIME SERIES FOR EUROPE AND FOR ICELAND, UPDATING THE WORK OF LAMB AND BERGTHORSSON. DATA ALREADY AVAILABLE IN THE CLIMATIC RESEARCH UNIT WILL BE SUPPLEMENTED BY NEW PRIMARY SOURCE MATERIAL WHERE NECESSARY. A PARALLEL STUDY WILL COLLECT AND INTERPRET MARINE HISTORICAL DATA IN ORDER TO DETERMINE PAST CHANGES IN OCEAN CURRENTS AND SEA SURFACE TEMPERATURES. THESE TERRESTRIAL AND MARINE RECONSTRUCTIONS WILL BE INTERPRETED IN TERMS OF CIRCULATION PATTERN CHANGES PARTLY ON THE BASIS OF STATISTICAL RELATIONSHIPS DERIVED FROM INSTRUMENTAL DATA. SEASONAL CIRCULATION MAPS WILL BE CONSTRUCTED USING HISTORICAL DATA AND INTERPRETATION METHODS ALREADY DEVELOPED AND TESTED IN THE CLIMATIC RESEARCH UNIT.NEW DOCUMENTARY DATA WILL BE SOUGHT TO FILL IN SPATIAL GAPS WHERE NECESSARY. THIS ASPECT WILL INITIALLY CONCENTRATE ON SEVERE SEASONS IN THE PERIOD 1550-1750 AD. FURTHER TESTING OF THE METHODOLOGY USING INSTRUMENTALLY-BASED SYNOPTIC PRESSURE MAPS FOR THE 1780S WILL BE PERFORMED.

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UNIVERSITY OF EAST ANGLIA
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University Plain
NORWICH
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