README: Reconstruction of atmospheric H2 from Greenland and Antarctic firn air

https://doi.org/10.5061/dryad.zkh1893gm

This dataset contains data and model codes used to reconstruct atmospheric H2 from polar firn air profiles, as described in the following publication:

Patterson, J. D., Aydin, M., Crotwell, A. M., Pétron, G., Severinghaus, J. P., Krummel, P. B., Langenfelds, R. L., Petrenko, V. V., and Saltzman, E. S.: Reconstructing atmospheric H₂ over the past century from bi-polar firn air records, Clim. Past, https://doi.org/10.5194/cp-2023-27, in press.

Description of the data and file structure

Files:
Megadunes2004.csv
NEEM2008.csv
SouthPole2001.csv
Summit2013.csv
Format: *.csv (comma delimited text)
Content: Depth (meters), H2 (parts per billion), 1 sigma standard deviation (ppb)
Notes: These data have been gravity-corrected and outliers removed as described in Patterson et al. (2023).

Code/Software

Content: UCI firn air model for simulating the propagation of various trace gases through a firn column at several polar sites.
Inputs: site physical properties, trace gas physical properties, atmospheric trace gas history
Output: depth profiles of trace gas content in firn air (open porosity) as a function of time
Model modes:

1. historical mode (time stepping forward) in which a time series of atmospheric trace gas mixing ratio is provided
2. Green's function mode in which the propagation of a 1 year pulse of trace gas is followed in time

All code files are Matlab scripts (text files, with *.m filenames). Data files are Matlab *.mat binary files created under under Matlab version 2022b.
Main code file: model_20231004.m
Supporting code files:
get_gas_props_20191009.m
get_hist_20230327.m
get_site_props_20230329.m
Supporting data files:
\physprops\*physprops*.mat These files contain physical properties for various sites
\hists\*hist*.mat These contain atmospheric histories of various trace gases. Files containing "*_green.mat" contain atmospheric histories provided by Buizert et al. 2012.

Citation: Buizert, C., Martinerie, P., Petrenko, V. v., Severinghaus, J. P., Trudinger, C. M., Witrant, E., Rosen, J. L., Orsi, A. J., 740 Rubino, M., Etheridge, D. M., Steele, L. P., Hogan, C., Laube, J. C., Sturges, W. T., Levchenko, V. A., Smith, A. M., Levin, I., Conway, T. J., Dlugokencky, E. J., … Blunier, T. (2012). Gas transport in firn: Multiple-tracer characterisation and model intercomparison for NEEM, Northern Greenland. Atmospheric Chemistry and Physics, 12(9), 4259–4277. https://doi.org/10.5194/acp-12-4259-2012).

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