Download Cenozoic Plants and Climates of the Arctic by M. C. Boulter (auth.), Michael C. Boulter, Helen C. Fisher PDF

By M. C. Boulter (auth.), Michael C. Boulter, Helen C. Fisher (eds.)

Fifty million years in the past, the Arctic Ocean was once a hot sea, bounded by means of lush plants of the warm-temperate seashores of Scandinavia, Siberia, Alaska and the Northwest Territories. Wind and storms have been infrequent simply because Atlantic climate structures had no longer built yet, as this day, polar day size further a adverse point to this in a different way tranquil climate.
With the help of scientists from the entire nations as regards to the Arctic Circle, this publication describes the palaeontology, the statistical research of vegetational positive factors, comparisons with atmospheric, marine, and geological beneficial properties and a few of the 1st versions of plant migration constructed from newly built databases.

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Oxygen isotope records show that latitudinal temperature gradients were low (Kennett and Stott, 1991; Pak and Miller, 1992), and that surface waters at high latitudes and deep waters were warm (10-15 0c). g. Shackleton, 39 1986). Superimposed on the longer term trend there was a short-term extreme excursion to lower values of both oxygen and carbon isotopes in planktonic and benthic foraminifera (Fig. 5). These excursions appear to reflect a short-term whole ocean warming of several degrees, as well as a major upset in the global carbon cycle (Kennett and Stott, 1991; Pak and Miller, 1992; Thomas, 1992).

1976) fnit. Repts. DSDP Leg 38 (US Government Printing Office): 1256 pp. Thiede 1.

1993) is difficult however because the record of stomatal index fails to extend back far enough into the largest CO 2 excursions of the Tertiary. Long-term models of the carbon cycle are not able to resolve the CO2 record with sufficient detail (Berner, 1992; 1993) and so comparisons between models and the data are imprecise. Further, the CO 2 estimates cannot be compared with the ice core data because the fossil Q. , 1993). , 1993b) suggest that a change in the concentration of atmospheric CO 2 is the most likely causative environmental factor.

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