Paleomagnetic dating relies on
A common goal of stratigraphic studies is the subdivision of a sequence of rock strata into mappable units, determining the time relationships that are involved, and correlating units of the sequence—or the entire sequence—with rock strata elsewhere.
Following the failed attempts during the last half of the 19th century of the International Geological Congress (IGC; founded 1878) to standardize a stratigraphic scale, the International Union of Geological Sciences (IUGS; founded 1961) established a Commission on Stratigraphy to work toward that end.
“It wasn’t clear whether the simpler process models were missing an essential element, or whether GCMs were getting something wrong,” said Wagner, the lead author of the study.
“And as a result, it wasn’t clear whether or not a tipping point was a real threat.” Wagner and Eisenman resolve this discrepancy in the study in an upcoming Journal of Climate article, “How Climate Model Complexity Influences Sea Ice Stability.”They created a model that bridged the gap between the process models and the GCMs, and they used it to determine what caused sea ice tipping points to occur in some models but not in others.
None of the relevant previous process modeling studies had included both of these factors, which led them to spuriously identify a tipping point that did not correspond to the real world.” “Our results show that the basis for a sea ice tipping point doesn’t hold up when these additional processes are considered,” said Wagner.
“In other words, no tipping point is likely to devour what’s left of the Arctic summer sea ice.
These schemes, when used in conjunction with other dating methods—such as radiometric dating (the measurement of radioactive decay), paleoclimatic dating, and paleomagnetic determinations—that, in general, were developed within the last half of the 20th century, have led to somewhat less confusion of nomenclature and to ever more reliable information on which to base conclusions about Earth history.Ever since the striking record minimum Arctic sea ice extent in 2007, the ominous scenario of a sea ice tipping point has been a fixture in the public debate surrounding man-made climate change and a contingency for which Arctic-bordering countries have prepared.For decades, scientists have been concerned about such a point of no return, beyond which sea ice loss is irreversible.Stratigraphy, scientific discipline concerned with the description of rock successions and their interpretation in terms of a general time scale.It provides a basis for historical geology, and its principles and methods have found application in such fields as petroleum geology and archaeology.
Search for paleomagnetic dating relies on:
This concern was supported by mathematical models of the key physical processes (known as process models) that were believed to drive sea ice changes.