Radiocarbon bomb spike reveals biological effects of Antarctic climate change



This article corrects:

  1. Radiocarbon bomb spike reveals biological effects of Antarctic climate change Volume 18, Issue 1, 301–310, Article first published online: 27 October 2011

In the paper by L. J. Clarke et al., 2012, doi: 10.1111/j.1365-2486.2011.02560.x, published in Global Change Biology, 1, 301–310, Figs 2 and 3 were incorrectly published in black and white while they should have been in color. The publisher apologizes for any inconvenience that has been caused and reproduces the corrected figures below. Readers may refer to the online version of this article to view the article with the corrected color figures.

Figure 2.

Dating of Antarctic mosses using bomb 14C. (a) Annual SH atmospheric 14C for 1945–2002. This 14C record comprises SH atmospheric 14C for 1955–2002 (Hua & Barbetti, 2004) supplemented with 14C data from annual tree rings from Washington State, USA for 1945–1954 (Stuiver et al., 1998) because annual 14C tree-ring data for the SH are not available for the prebomb period. (b) 14C content of shoot sections from four moss species collected from the Vestfold Hills and Windmill Islands, East Antarctica (= 7–18). Note that one sample (section) of B. recurvirostre, Grimmia Gorge was lost during target preparation for AMS analysis. (c) Dated C. purpureus shoot from ASPA 135, showing approximate 14C calibrated dates for the growth period of shoot sections. All 14C values are shown in percent modern carbon (pMC, Friedli et al., 1986). y-axis error bars are 1σ, x-axis error bars in (b) represent the length of shoot sections.

Figure 3.

Changes in growth rate of mosses from the Windmill Islands and Vestfold Hills over time. Growth rates were estimated from the gradient of a spline fitted to plots of the calibrated 14C age of shoot core sections against their distance from the growing tip. Clark –C. purpureus (open squares), S. antarctici (closed squares); Grimmia Gorge – B. recurvirostre (open triangles), B. pseudotriquetrum (closed triangles). Note that Clark samples are from separate sites on Clark Peninsula (see Table 1; Fig. 1). x-axis error bars represent calibrated 14C age range at 2σ, y-axis error bars represent the maximum difference between growth rate estimates from the spline curve using upper and lower limits of the calibrated 14C age range compared with the mean 14C age.