ODP 1262¶

The sites recovered during ODP Leg 208 at Walvis Ridge in the southeast Atlantic Ocean provide a classic and continuous record of climate change throughout the Cenozoic (Zachos, 2004). These sediments contain well-preserved signals of astronomical climate forcing (e.g., Liebrand et al., 2017; Westerhold et al., 2020; Drury et al., 2021). In particular, the stratigraphic interval between the Elmo event and the Paleocene-Eocene Thermal Maximum (PETM), approximately 54–56 Ma, at Site 1262 serves as a key reference for reconstructing past variations in eccentricity from geological data.

Files in the data folder¶

ODP1262.csv: Data of the ODP_926 site.
208-1262_age_model.tab: Age model data extracted from the paper Astronomical calibration of the Paleocene time (Westerhold et. al., 2008)
data_1260.csv: Information about the data and the age-depth model used for the ODP_1262 results.

Data Used¶

File	Description	Reference	Transformations / Pre-Processing	Version
`ODP1262.txt`	a* (red/green ratio) color reflectance data measured at the surface of the archive half of the split core between 118.1–139.5 m composite depth at ODP Site 1262. Represents astronomical imprint across the 54.1–55.8 Ma interval.	Westerhold et al. (2007, 2008); Westerhold et al. (2017)	Detrended using LOWESS with 30% smoothing; normalized to zero mean and unit variance.	1.0
`208-1262_age_model.tab`	Age–depth model calibrated to the Ypresian astronomically tuned timescale, yielding an age range of 54.125–55.791 Ma for the studied interval.	Westerhold et al. (2017)	“Changed names of columns: Depth mcd [m] -> Depth and Age [Myr] -> Age; sedimentation rate considered approximately constant (~1.3 cm/kyr) with small fluctuations.	1.0

Execute the Example¶

Note

The folder examples has to bee in the same directory as the AstroGeoFit_tool.py file. If not, this will not work.

To run the example, open a terminal in the AstroGeoFit folder. Once this is open execute the following

python AstroGeoFit_tool.py --odp_1262

This command will execute the significance test, the genetic algorithm fitting, the MCMC, and the MCMC weights calculation.

If you only want to run specific components (e.g., the genetic algorithm fitting and the MCMC), you can use:

python AstroGeoFit_tool.py --odp_1262 -fit -mcmc

The full list of execution options can be found in AstroGeoFit Script Execution

Visualization of the Results¶

To visualize the results, you can use the two Jupyter notebooks provided. To obtain the results of the ODP_1262 data, just modify the variable configuration_file_path in the following way:

configuration_file_path = "odp_1262"

And then the visualization notebook will be ready to be executed.

For a detailed guide on using the notebooks and interpreting the figures, please refer to Visualization of the Results Guide.