co2 {paleobuddy}

Jurassic CO2 data

Description

CO2 data during the Jurassic. Modified from the co2 set in RPANDA, originally taken from Mayhew et al (2008, 2012). Inverted so lower times represent time since first measurement, to be in line with the past-to-present convention of most time-dependent functions in paleobuddy.

Usage

data(co2)

Format

A data frame with 53 rows and 2 variables:

t

A numeric vector representing time since the beginning of the data frame age, 520 million years ago, in million years. We set this from past to present as opposed to present to past since birth-death functions in paleobuddy consider time going in the former direction. Hence t = 0 represents the time point at 520mya, while t = 520 represents the present.

co2

A numeric vector representing CO2 concentration as the ratio of CO2 mass at t over the present.

Source

https://github.com/hmorlon/PANDA

References

Morlon H. et al (2016) RPANDA: an R package for macroevolutionary analyses on phylogenetic trees. Methods in Ecology and Evolution 7: 589-597.

Mayhew, P.J. et al (2008) A long-term association between global temperature and biodiversity, origination and extinction in the fossil record Proc. of the Royal Soc. B 275:47-53.

Mayhew, P.J. et al (2012) Biodiversity tracks temperature over time Proc. of the Nat. Ac. of Sci. of the USA 109:15141-15145.

Berner R.A. & Kothavala, Z. (2001) GEOCARB III: A revised model of atmospheric CO2 over Phanerozoic time Am. J. Sci. 301:182–204.