Ground-truthing Marcott

Climate Audit

The MD99-2275 core offshore Iceland is a very high-resolution ocean sediment core, results of which over the past millennium have been discussed here from time to time. Alkenone and diatom results for the last millennium have been available for about 10 years. MD99-2275 results were used in PAGES2K Arctic and Hanhijarvi 2013, also Trouet et al 2009, but not Marcott et al 2013.  Because of their high resolution and because of their extension through box cores into the 20th century,  it’s gratifying that high resolution results are now becoming available through the Holocene.  In 2012, alkenone results were extended back at high resolution to 4500 BP and last week, Jiang et al archived their diatom results back to 9271 BP in the early Holocene. In today’s post, I’ll show the new results from Jiang et al and show an interesting comparison to Marcott.

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