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Progress in Earth and Planetary Science
Fig. 3 | Progress in Earth and Planetary Science

Fig. 3

From: Alkenone surface hydrographic changes of the subarctic Northwestern Pacific since the last glacial: proxy limitations and implications of non-thermal environmental influences

Fig. 3

Example chromatograms of glacial alkenone warming and downcore alkenone-related variations since the last glacial. Representative GC-FID chromatograms of alkenone-containing sediment extracts from examples of a LGM and b the B/A interstadial are illustrated. Alkenone peak assignation: IS/Internal standard, C37:4, C37:3, C37:2. c freshwater signals C37:4, d residuals in alkenone unsaturation index (Uk’37 - Uk37; black) and alkenone SSTs (red), and e alkenone unsaturation index Uk’37 (blue) and Uk37 (gray), all are plotted against age and compared with the f published downcore δ18O stratigraphy (Gorbarenko et al. 2017, 2019). Shaded intervals indicate LGM, stadial HE 1, B/A (sub)-interstadials, and YD

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