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Apply a simple ice-volume correction to marine-isotope proxy records in Python

Project description

erebusfall

Travis-CI Build Status

Apply a simple ice-volume correction to marine-isotope δ18O and δD proxy records, in Python.

The correction uses the LR04 benthic stack from Lisiecki and Raymo, 2005. The stack is scaled so that the LGM-to-present change is assumed to be 1.0 ‰ in accordance with the pore-water estimate of Schrag et al. 1996. The package is adapted from the ice-volume correction in Tierney et al. 2017.

Example

Start by importing erebusfall, numpy:

import erebusfall as ef
import numpy as np

...and creating a hypothetical proxy time series...

age_ka = np.arange(0, 20, 1)
proxy = np.random.normal(loc=-2.0, size=len(age_ka))

Now we can plug this into ef.icevol_correction() with a few key options:

proxy_adjusted = ef.icevol_correction(age_ka, proxy, 
                                      proxytype='d18o', 
                                      timeunit='ka')

We first plug in the proxy age and proxy values. The proxytype='d18o' indicates that we're dealing with δ18O. We can set proxytype='dd' for a δD record. The timeunit argument indicates that age_ka is in thousands of years before present. There are also options for for "years BP" and "million years BP". The output from the function, proxy_adjusted, is the corrected isotope proxy as a numpy array.

See help(ef.icevol_correction) for more documentation.

Installation

You can install the package from PyPI with

pip install erebusfall

If you want to use conda:

conda install erebusfall -c sbmalev

Development and Support

Source code is hosted online under an Open Source license. Please feel free to file any bugs and issues you find.

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