Effects of Past Global Change on Life (1995) / Chapter Skim
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Pages 36-38
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From page 36... ...
Late Ordovician-Early Silurian ocean circulation (see Figures 2.1 and 2.2) is based on the assumption that similar insolation patterns existed in the Ashgill as at present.
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From page 37... ...
Northern Hemisphere Summer 90°s LEGEND NP ~ North Polar Current NSP ~ Nonh Subpolar Current NT = North Tropical Current WATER MASSES ~Warm Currents NE = North Equatorial Current - ~ Cool Currents M - Monsoonal Counter-Current SE = South Equatorial Current ·. ~ ~ Subtropical Convergence Ssp - south Tropical Current ~ ~~~ Polar Convergence SP - South Polar Current Cold Cool Warm H Center ot Oceanic High Pressure FIGURE 2.1 Paleogeographic maps for Ashgill time showing positions of lands, shelf seas, and open oceans.
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From page 38... ...
Surface water current impinged on only the outer margins of plates, and shelf seas were significantly narrower than prior to glaciation. Surface currents may have swept along shelf margins more strongly that when waters were widespread across the shelves.
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