After the war, salmon runs declined for a variety of reasons including past overfishing, lax management and a general downturn in salmon survival due to a change in long-term climate cycles known as the Pacific decadal oscillation.
32.
The temperature change affects the deuterium content of ice caps, so the H / D isotopic composition of ice can give estimates for the historical climate cycles such as the timelines for interglacial and glacial periods . [ See section 7.2.
33.
The first climate cycle comprises a continuous indirect spray of neutral ( pH 6.5 to 7.2 ) salt water / synthetic seawater solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml / 80 cm?/ hour.
34.
Wilmot H . Bradley showed that annual varves in lake beds showed climate cycles, and A . E . Douglass found that tree rings could track past climatic changes but these were thought to only show random variations in the local region.
35.
Gerard C . Bond of the Lamont Doherty Earth Observatory at Columbia University, was the lead author of the 1997 paper that postulated the theory of 1470-year climate cycles in the Late Pleistocene and Holocene, mainly based on petrologic tracers of drift ice in the North Atlantic.
36.
However, scientists such as Mukul Sharmar, Charles A . Perry, Yuk Yung, Nigel Calder, Henrik Svensmark, Eigil Friis-Christensen, Knud Lassen and Alexander Chizhevsky who have cited variations in the sunspot cycle as the dominant mechanism in climate cycles on Earth, not vegetation, have yet to incorporate the demineralization dimension.
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