A high resolution absolute dating holocene and deglacial asian
Second, there is also uncertainty as to the age of the actual proxy, which the researchers explore the significance of for their study by performing their calculations many times and randomly choosing values within their uncertainties (a "Monte Carlo" technique).
This Monte Carlo technique helps them better assess how confident they can be in their final conclusions.").
Across these studies, the rate and magnitude of warming observed, beginning with the Industrial Revolution in the late 19th century, is greater than the rate and magnitude of temperature changes for the preceding 1000 to 2000 years."), but whether recent warming is anomalous relative to variability over the entirety of the Holocene interglaciation (the past 11,500 years) (4) has yet to be established.
The 73 globally distributed temperature records used in our analysis are based on a variety of paleotemperature proxies and have sampling resolutions ranging from 20 to 500 years, with a median resolution of 120 years ().
First, they note that there is uncertainty in the relationship between proxy values and the variable they represent (e.g., temperature).
A proxy is a material that provides an indirect measurement of a paleoclimate variable.
These proxies record a physical, chemical, or biological signal that depends on a climate variable such as temperature or precipitation amount.
"Proxy-based Several studies have focused on reconstructing Earth's temperature history for the last 1000 to 2000 years.
These studies have used temperature records from proxies, including tree rings and lake and ocean sediments.