Fig. 1 Time series and megadrought state changes.

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Presentation transcript:

Fig. 1 Time series and megadrought state changes. Time series and megadrought state changes. (A) The monthly NINO3.4 index from PHYDA (27) in black, with dashed gray lines showing the 5th and 95th percentiles of the PHYDA reconstruction ensemble and the yellow line showing a 20-year locally weighted linear regression smoothing of the NINO3.4 time series. (B) Annual AMO [or North Atlantic SST (NASST)] index from PHYDA in black, with dashed gray lines and yellow line as in (A). (C) The mean NINO3.4 and AMO [corresponding to black lines in (A) and (B)] along with a global mean forcing estimate (see Materials and Methods) and highlighted megadrought periods. (D to F) Probability density functions (PDFs) of temperature for the NINO3.4, AMO, and forcing estimate during the reference years of 1601–1925 (teal), all the states during each of the megadroughts (orange), and the remaining nondrought segments from 800 to 1600 (black). NINO3.4 and AMO PDFs are for the full reconstruction ensemble from PHYDA, while the forcing PDF is for the full ensemble forcing estimate (see Materials and Methods). (G to I) Change in percentiles of the PDFs shown in (D) to (F) relative to the corresponding 1601–1925 reference PDF. Percentile changes show which parts of the megadrought and nondrought distributions change relative to the reference distribution. Nathan J. Steiger et al. Sci Adv 2019;5:eaax0087 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).