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T3 Unforced variability in summer storm track position over the past millennium Mary Gagen 1 *, Eduardo Zorita 2 , Danny McCarroll 1 , Neil Loader 1 , Iain Robertson 1 , Giles Young 1 and the Millennium team 3 . 1 Swansea University, Swansea 2 HZG, Geesthacht, Germany 3 EU 6th Framework Project Millennium 017008 Disentangling the regional climate changes which are attributable to external forcings from the multidecadal internal variability is essential to estimate the range of regional future climate change. There are indications, in the recent past, of large multi-decadal excursions in European temperatures that do not match estimated external forcing. Here we analyse the simulated and reconstructed evolution of European summer temperatures over the last millennium in an attempt to identify where specific deviations are distinctly caused by internal processes. In addition to a forced, spatially homogeneous, temperature response to external forcing, we identify a pattern of unforced multidecadal variability that is best described by a north-south temperature dipole over Europe. In observations and climate simulations, this mode is linked to precipitation and cloud cover variability and represents a meridional variations of the summer storm tracks in the European-North Atlantic region. It expresses strongly in multi decadal phases centred on AD 1620 and 1900 and explains the recent period of cool, damp summers experienced by northern Europe. Our results indicate that storm tracks meridional vacillations may display wide, unforced, multidecadal variability. Keywords: Climate change; palaeoclimate; storm track; climate reconstruction; last millennium
T9 The Anthropogenic Element in the Palaeoecology of the Lizard Peninsula, Cornwall G. G. Garbett 1,2 1 The Open University, Milton Keynes 2 Cornwall College, Pool, Redruth, Cornwall The Lizard Peninsula is the most southerly point of the British Isles. It is well known for its rare plants resulting from its unusual geology and its near Mediterranean climate. The palaeoecology of the Peninsula’s 100 m OD Pliocene plateau has previously been under researched. Pollen diagrams from two sites on the plateau are presented here. The ‘Hendra’, diagram is from a 1.2 m core collected from the organic sediments of an abandoned river terrace approximately 50 m below the 100 m summit of the plateau. The basal 14 C date is 7489±64 cal. yrs BP. It indicates an early pine forest, gradually replaced by birch and hazel and finally, by 4383±137 BP, mixed deciduous woodland with locally abundant alder. By 2230±82 BP the woodland has been replaced by pasture and heathland with large Poaceae grains indicating arable agriculture. At about 1237±61 BP the heathland and woodland pollen largely disappears with a coincident increase in large Poaceae and pasture herb grains. The ‘Croft Pascoe’ diagram has been constructed from an 85 cm sediment core taken from a wet, linear feature on the summit of the plateau at Goonhilly Downs. The basal sediment’s 14 C date is 4152±254 BP and indicates a relatively open landscape with some oak and hazel, abundant grass and pasture herbs and with arable agriculture suggested by occasional large Poaceae grains. These have been provisionally identified as within the barley and oat/wheat groups of Andersen (1979). This pollen assemblage continues largely unchanged until 2788±48 BP when there are clear signs of an hiatus in the pollen record. By 569±57 BP the pollen rain is dominated by Ericaceae spp. particularly the endemic Cornish Heath. The first discussion point arising from these diagrams is the retreat of the pine forest approximately 3000 years later than elsewhere in the British Isles, although other sites in the south also show a late retreat (Groves et al., 2012). A second key finding is the indication of Bronze Age arable farming on the summit of the plateau. This area has not been farmed within the historical period suggesting very different climatic and edaphic conditions and the possibility of climate change resulting in the abandonment of the high plateau in the late Bronze Age. Finally the anthropogenic element in the development of the heathland is evident from both archives, with heathland existing alongside agriculture in its early stages. It was suppressed at Hendra by an increase in agricultural activity but at Croft Pascoe the abandonment of agriculture was followed by the domination of the plateau pollen by ericaceous species. Keywords: Lizard Peninsula; palaeoecology Andersen, S.T. (1979) Identification of wild grasses and cereal pollen. Danmarks Undersøgelse, Arbog, 1978, 69-72 Geol Groves, J.A., Waller, M.P., Grant, M.J. and Schofield, J.E. (2012) Long-term development of a cultural landscape: the origins and dynamics of lowland heathland in southern England. Veget, Hist. Archaeobot. Published online 06.09.2012
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QRA@50: Quaternary Revolutions QRA
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Conference Programme Wednesday 8th
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General Notes Exhibitors A small nu
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QRA50: Top 50 UK Quaternary Sites N
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THEME 1: CAUSES OF CLIMATE CHANGE C
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THEME 2: MEASURING TIME Radiocarbon
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THEME 3: MEASURING AND UNDERSTANDIN
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THEME 4: MODELLING THE EARTH SYSTEM
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modeling context, or in the context
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THEME 5: ICE SHEET DYNAMICS Time, t
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THEME 7: THE OCEANS The Oceans, CO
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THEME 8: TERRESTRIAL STRATIGRAPHY A
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THEME 9: PALAEOECOLOGY Conservation
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THEME 9: PALAEOECOLOGY Beetles, bon
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THEME 10: HUMAN ORIGINS, ENVIRONMEN
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THEME 11: INSIGHTS FROM GENETICS In
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Page 53 and 54: T2 Towards a Greenland tephra latti
Page 55 and 56: T5 BRITICE-CHRONO Transect 8: const
Page 57 and 58: T8 Pleistocene landscape change at
Page 59 and 60: T10 Advances in geoconservation: fu
Page 61 and 62: T7 ARAMACC: Advancing the use of an
Page 67 and 68: T5 BRITICE-CHRONO: Constraining rat
Page 69 and 70: T2 Tracing and constraining key tep
Page 71 and 72: T2 Testing the potential of OSL to
Page 73 and 74: T5 Reconstruction of ice-sheet chan
Page 75 and 76: T3 Spatial and temporal variability
Page 77 and 78: T5 Glacial geomorphology of the Inn
Page 79 and 80: T2 Revolution and evolution: 35 yea
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Page 83 and 84: T2 Improving surface exposure ages
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Page 95 and 96: T5 Modelling the water isotope resp
Page 97 and 98: T9 Biome dynamics in the Ohrid Basi
Page 99 and 100: T5 The Moffatdale RSF cluster, Sout
Page 101 and 102: T11 Combining palynology and ecolog
Page 103 and 104: Figure 1: The palm swamp forest at
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Page 109 and 110: T3 Quaternary revelations: the role
Page 111 and 112: T8 Late-Middle to Late Pleistocene
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Page 115 and 116: T8 Svalbard surging glacier landsys
Page 117 and 118: T2 Constraining peatland environmen
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Page 121 and 122: T10 Developing a Holocene tephrostr
Page 123 and 124: Roberts, S. J. (1997) The spatial e
Page 125 and 126: T7 Pleistocene sea-surface and inte
Page 127 and 128: T10 Man, Megafauna and Mycobacteria
Page 131 and 132: T8 The “Four Ages” of Micromorp
Page 133 and 134: T3 Continental silicon cycling and
Page 135 and 136: T5 Reconstructing plateau icefields
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T3 Exploiting multi-proxy analysis
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T3 Tipping Points: Rapid Neo-glacia
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T5 Glacial history of the central n
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T8 Reconstructing Quaternary Rhine-
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T9 When was Europe deforested? Larg
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T9 Long-term vegetation development
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T9 Climate, microtopography and per
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T3 The temperature-δ 18 O relation
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T10 Neolithic land-use change clima
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T5 Assessing existing dating constr
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T10 Assessing the effects of the '2
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Figure 1: Lake ‘Disko 2’ on Dis
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T5 Increased channelization of subg
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T7 Holocene controls on silicic aci
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T8 Tanera Mor: a new stratotype for
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T8 Landscape response to abrupt cli
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T9 Impact of vegetation shifts on i
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T9 Assessing seasonality changes du
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T2 Cryptotephra records as archives
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Westaway, R., Bridgland, D.R., Mish
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T3 Songs from the wood: tales of th
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T9 Lateglacial and Holocene Climate
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