Compilations and splined-smoothed calculations of continuous records of the atmospheric greenhouse gases CO2, CH4, and N2O and their radiative forcing since the penultimate glacial maximum ...

• Main Authors: Köhler, Peter, Nehrbass-Ahles, Christoph, Schmitt, Jochen, Stocker, Thomas F, Fischer, Hubertus
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2017
• Subjects: ice core
• Online Access: https://dx.doi.org/10.1594/pangaea.871273; https://doi.pangaea.de/10.1594/PANGAEA.871273

Continuous records of the atmospheric greenhouse gases (GHGs) CO2, CH4, and N2O are necessary input data for transient climate simulations and their related radiative forcing important components in analyses of climate sensitivity and feedbacks. Since the available data from ice cores are discontinuous and partly ambiguous a well-documented decision process during data compilation followed by some interpolating post-processing are necessary to obtain those desired time series. Here we document our best-guess data compilation of published ice core records and recent measurements on firn air and atmospheric samples covering the time window from the penultimate glacial maximum (approx. 156 kyr BP) to 2016 CE. A smoothing spline method is applied to translate the discrete and irregularly spaced data points into continuous time series. These splines are assumed to represent the evolution of the atmospheric mixing ratios for the three GHGs. Global-mean radiative forcing for each GHG is computed using ... : Supplement to: Köhler, Peter; Nehrbass-Ahles, Christoph; Schmitt, Jochen; Stocker, Thomas F; Fischer, Hubertus (2017): A 156 kyr smoothed history of the atmospheric greenhouse gases CO2, CH4, and N2O and their radiative forcing. Earth System Science Data, 9(1), 363-387 ...