Science of dating events using ice Free ex chat on skype
Science means “knowledge” and refers to a process by which we learn about the natural world.There are two different kinds of science; observational and historical. The mean observed stratospheric transport and deposition time to Law Dome from the eruption site is 1.5 years (σ = 0.6 years) from 11 well-dated eruptions. This event is also observed in other ice core records and is attributed to the volcano Kuwae, with an eruption date in the range A. 1455.9–1459.9 if all sources of error are considered. Mayewski (2001), High-precision dating of volcanic events (A. Despite often-sensationalized headlines to the contrary, nothing in biology has ever been observed to do this.This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use.
Making a distinction between operational (observational) science and historical (origins) science helps us to understand the limitations of these naturalistic presuppositions in science.Dansgaard–Oeschger events (often abbreviated D–O events) are rapid climate fluctuations that occurred 25 times during the last glacial period.Some scientists say that the events occur quasi-periodically with a recurrence time being a multiple of 1,470 years, but this is debated.For example, about 11,500 years ago, averaged annual temperatures on the Greenland ice sheet warmed by around 8 °C over 40 years, in three steps of five years (see, Stewart, chapter 13), where a 5 °C change over 30–40 years is more common.
Heinrich events only occur in the cold spells immediately preceding D-O warmings, leading some to suggest that D-O cycles may cause the events, or at least constrain their timing.
Indeed, the Vostok ice core was drilled before the Greenland cores, and the existence of Dansgaard–Oeschger events was not widely recognised until the Greenland (GRIP/GISP2) cores were done; after which there was some reexamination of the Vostok core to see if these events had somehow been "missed".