Descriptive physical oceanography by M P M Reddy

By M P M Reddy

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Direct micropalaeontological evidence indicates LGM conditions in the Celtic Sea equivalent to the fjords of East Greenland north of 76°N at present (Scourse et al. 1990) with in situ ontogenetic series of Arctic ostracod instars. LGM grounded ice (Irish Sea Ice Stream) reached the Isles of Scilly (Scourse 1991, Hiemstra et al. 2006, McCarroll et al. 2010). Evidence from ­ice-­rafted detritus (IRD) * The use of the term periglacial for glacial refugial populations is potentially confusing. The term periglacial refers to terrestrial environments where ­frost-­action processes dominate with two diagnostic criteria: freezing and thawing of the ground and the presence of permafrost (French, 1976).

Based on this assumption, CORONA tested, amongst other things, the hypothesis that the intertidal rocky community of the ­north-­western Atlantic was colonized by immigrants from Europe (Wares & Cunningham 2001). , on Littorina saxatilis; Panova et al. 2011). In the eastern North Atlantic, the genetic evidence for northwards spread of thermophilous species following the LGM from southern refugia, notably in Iberia, along the Atlantic littoral, is strong (Figure 18). The Iberian refuge includes the teleosts Pomataschistus microps (Gysels et al.

Not only is the organism–­­sea-­surface relationship tightly constrained, but also reefs have excellent preservation potential, so a record of their response to past ­sea-­level changes is embedded in reef facies architecture. The response of reefs to RSL rise was analysed in an influential contribution by Neumann & Macintyre (1985), who identified three responses: keep up, catch up and give up. ­Keep-­up reefs develop close to sea level and keep pace with any rise in RSL by vertical accretion.

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