Open AccessReply to Roberts et al.: A subdecadal record of paleoclimate around the Youngest Toba Tuff in Lake Malawi
Author(s) -
Christine Lane,
Ben T. Chorn,
Thomas C. Johnson
Publication year - 2013
Publication title -
proceedings of the national academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.1309815110
Subject(s) - paleoclimatology , geology , archaeology , absolute dating , paleontology , geochemistry , physical geography , quaternary , climate change , oceanography , geography
Roberts et al. (1) state that we found no evidence of climate change at multidecadal to millennial timescales following deposition of the Youngest Toba Tuff (YTT) in Lake Malawi (2). However, we examined smear slides at a 2-mm interval, corresponding to subdecadal resolution, and X-ray fluorescence scans run at 200-µm intervals correspond to subannual resolution. We observed no obvious change in sediment composition or Fe/Ti ratio, suggesting that no thermally driven overturn of the water column occurred following the Toba supereruption. With regard to extrapolation of the Lake Malawi paleoclimate record for tropical East Africa in general, we agree that the regional pattern of …
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