Sentences with phrase «shorter orbital cycles»

Not exact matches

Periods of volcanism can cool the climate (as with the 1991 Pinatubo eruption), methane emissions from increased biological activity can warm the climate, and slight changes in solar output and orbital variations can all have climate effects which are much shorter in duration than the ice age cycles, ranging from less than a decade to a thousand years in duration (the Younger Dryas).

The cause of this relatively short lived cooling (it was not a true «ice age») is not fully known, but the sun could have been cooler, there may have been more volcanic eruptions, there is a small but persistent cooling trend due to orbital cycles (as explained above).

The cause of this relatively short lived cooling (it was not a true «ice age») is not fully known, but the sun could have been cooler, there may have been more volcanic eruptions, there is a small but persistent cooling trend due to orbital cycles (as explained above).

It is true that there are some orbital cycles that operate on thousands, tens of thousands and hundred thousand year cycles but this has no bearing on short term perturbations such as a large volcanic eruption, a large release of methane clathrates or a large injection of anthropogenic CO2.

With regard to orbital tuning, it seems logical to me that if I took a large number of short random sequences and stacked them to form a long sequence taking care that the largest peak in any sequence always matched a 41k year cycle, a fourier analysis would pick out the 41k year cycle very strongly.

Short term solar cycles of the 27 day rotation periods, due to the polarity shifts in magnetic flux changes in the solar wind, The moon has a North / South declinational component as part of it's set of orbital parameters.

Kent and Olsen say that every 405,000 years, when orbital eccentricity is at its peak, seasonal differences caused by shorter cycles will become more intense; summers are hotter and winters colder; dry times drier, wet times wetter.

In short, the initial warming was indeed triggered by the Milankovitch cycles, and that small amount of orbital cycle - caused warming eventually triggered the CO2 release, which caused most of the glacial - interglacial warming.

The short answer is that the Earth's orbital changes (Milankovich cycles) cause really, really slow variations in the amount of the Sun's radiation that hits the northern hemisphere.