1992/01/01 by H. Willkomm, Willkomm, H., Manfred Bölter +3
Earth and Planetary Sciences · Environmental Science · Social Sciences · #Geology and Paleoclimatology Research #Pleistocene-Era Hominins and Archaeology #Polar Research and Ecology #Science
paper · pdf · doi:10.2312/polarforschung.61.2-3.103
openalex publication_date 1992/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/15
By thc nuclcar bomb tests during thc 1950s and early 19605.thcradiocarbon content of thc atmosphcric CO., on rhe Southem Hemisphcrc roxe wirhin a fcw years from 98 [0 162'k of rhc standard recent value and thcn droppcd 10 122 ck (at thc end of 1984).This rapid Iluctuation was used 10 determine the lifetime of five species of lichens collected in the beginning of 1985 in the maritime Antarctic.Under the assumption that lichens assimilate each year carbon at the same rate and that earbon once fixed at least in main branches never will be exchaugcd latcr on, tbe age of maturc thalli of Caloplaca regalis.Ramatina tercbrata and Usnca antarctica was detennincd to 32 ycars, whilc U. aurantiaco-atra and Himantormia Iugubris guve an age of ca.38 years and ca.60 years, respectively.