TrenchR implements routines that are targeted at the analysis, together with accompanying plotting, of spatial and temporal variations of proxy data derived from spatial arrays of records, specifically from trenches, i.e., proxy depth profiles sampled longitudinally at regular intervals. This part is still under active development, but the package incorporates the analyses of Antarctic snow trench stable isotope data performed for the publication of Münch et al. (2017).
The R code in this package has been implemented by Dr. Thomas Münch. For further information, code enhancements or potential bugs, please write to <[email protected]> at the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Germany, or open an issue on the repository page.
This work was supported by Helmholtz funding through the Polar Regions and Coasts in the Changing Earth System (PACES) programme of the Alfred Wegener Institute and by the Initiative and Networking Fund of the Helmholtz Association Grant VG-NH900.
TrenchR is currently available from its GitHub repository and is installed via:
# install.packages("remotes")
remotes::install_github("EarthSystemDiagnostics/TrenchR", build_vignettes = TRUE)- The package vignette
Plot Münch et al. (2017) figuresshows how to reproduce the plots for the publication Münch et al. (2017) and is available after installing the package as shown above. The respective vignette of the package development version is linked here.
Several datasets are included in TrenchR and can be accessed from the following variables after loading the package:
t13.trench1: Antarctic snow trench T13-1 stable water isotopologue data and meta information.t13.trench2: Antarctic snow trench T13-2 stable water isotopologue data and meta information.t15.trench1: Antarctic snow trench T15-1 stable water isotopologue data and meta information.t15.trench2: Antarctic snow trench T15-2 stable water isotopologue data and meta information.aws9: 2 m air temperature from the automatic weather station AWS9 at Kohnen Station, Dronning Maud Land, Antarctica, at monthly and annual resolution for the period December 1998 (start of AWS9 operation) until April 2014.ParamSpace: Data to reproduce Figure 5 in Münch et al. (2017).
Münch, T., Kipfstuhl, S., Freitag, J., Meyer, H., and Laepple, T.: Constraints on post-depositional isotope modifications in East Antarctic firn from analysing temporal changes of isotope profiles, The Cryosphere, 11(5), 2175-2188, doi: 10.5194/tc-11-2175-2017, 2017.