By Paul A Collinvaux, Paulo E. De Oliveira, Enrique Moreno

ISBN-10: 9057025876

ISBN-13: 9789057025877

Amazon will end up a strong instrument for ecologists and weather modelers. It additionally comprises short reports of pioneering pollen paintings within the Amazon thus far; sections on pollen tools, pollen facts, paleoecology, and lake coring tools.

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Extra resources for Amazon: Pollen Manual and Atlas

Sample text

In the face of fashion we began to suspect that tropical lowlands cooled in synchrony with the highlands. The test should be actual temperature records from the lowlands. We started looking for climate records in the equatorial lowlands, first in the Galapagos islands, then in the Amazon basin itself. Pure chance gave us an Amazon pollen record at the foot of the Andes, at a place called Mera in Ecuador. Kam-biu Liu found the Mera section. We were using a nearby airstrip as a base from which to fly to remote Amazonian lakes but were grounded by bad weather.

It is absolutely essential that the piston not slip from its position closing the mouth of the sample tube until it is precisely at the depth within the sediment column at which the next drive is to begin. Two alternative methods are used to secure the piston in place until deliberately freed. One method is to have a rod inside the sample tube that physically prevents the piston from being forced upward by water pressure. At sampling depth this ‘sliding rod’ is withdrawn and its end locked in place as the bottom of the drill string.

Yet just pushing a simple tube into the mud does not result in a complete core because the mud tends to block the end of the tube, after which continued pushing on the blocked tube merely pushes the sediment aside rather than letting the sediment enter. This happens because friction between the inside of the tube and the A guide to piston coring of lake sediments 33 sediment quickly becomes greater than the force needed to push the sediment aside. In lake coring, we overcome this inner friction by driving the sample tube past a captive piston so that sediment enters the sample tube for the whole of its length.

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Amazon: Pollen Manual and Atlas by Paul A Collinvaux, Paulo E. De Oliveira, Enrique Moreno

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