Reconstruction of atmospheric H2 from Greenland and Antarctic firn air
Data files
Nov 16, 2023 version files 5.32 KB
-
Megadunes2004.csv
-
NEEM2008.csv
-
README.md
-
SouthPole2001.csv
-
Summit2013.csv
Abstract
This data set contains:
- firn air depth profiles of H2 from 4 polar sites (South Pole and Megadunes in Antarctica) and NEEM and Summit in Greenland used to by Patterson et al., in press to reconstruct the history of atmospheric H2
- Matlab code for the UCI firn air model and data used in the reconstructions
Reference: 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.
Note: The firn air depth profiles archived here are processed to remove outliers and average replicates. For raw data, please contact the laboratories at which the measurements were made (G. Petron, GML/NOAA; P. Krummel; CSIRO).
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:
- historical mode (time stepping forward) in which a time series of atmospheric trace gas mixing ratio is provided
- 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).
<br>
Methods
The methodology used to obtain and process the data is described in Patterson et al., in press.