Southward movement of the Pacific intertropical convergence zone AD 1400–1850

Mann, M. E. et al. Proxy-based reconstructions of hemispheric and global surface temperature variations over the past two millennia. Proc. Natl Acad. Sci. USA 105, 13252–13257 (2008).

Trenberth, K. E. et al. Progress during TOGA in understanding and modeling global teleconnections associated with tropical sea surface temperatures. J. Geophys. Res. 103, 14291–14324 (1998).

Newton, A., Thunell, R. & Stott, L. Climate and hydrographic variability in the Indo-Pacific Warm Pool during the last millennium. Geophys. Res. Lett. 33, L19710 (2006).

Langton, S. J. et al. 3,500 yr record of centennial-scale climate variability from the Western Pacific Warm Pool. Geology 36, 795–798 (2008).

Verschuren, D., Laird, K. R. & Cumming, B. F. Rainfall and drought in equatorial east Africa during the past 1,100 years. Nature 403, 410–414 (2000).

Anderson, D. M., Overpeck, J. T. & Gupta, A. K. Increase in the Asian southwest monsoon during the past four centuries. Science 297, 596–599 (2002).

Alin, S. R. & Cohen, A. S. Lake-level history of Lake Tanganyika, East Africa, for the past 2,500 years based on ostracode-inferred water-depth reconstruction. Palaeogeogr. Palaeoclimatol. Palaeoecol. 199, 31–49 (2003).

Brown, E. T. & Johnson, T. C. Coherence between tropical East African and South American records of the Little Ice Age. Geochem. Geophys. Geosys. 6, Q12005 (2005).

Haug, G. H. et al. Southward migration of the intertropical convergence zone through the Holocene. Science 293, 1304–1308 (2001).

Sifeddine, A. et al. Laminated sediments from the central Peruvian continental slope: A 500 year record of upwelling system productivity, terrestrial runoff and redox conditions. Prog. Oceanogr. 79, 190–197 (2008).

Linsley, B. K., Dunbar, R. B., Wellington, G. M. & Mucciarone, D. A. A coral-based reconstruction of intertropical convergence zone variability over Central America since 1707. J. Geophys. Res. 99, 9977–9994 (1994).

Hodell, D. A. et al. Climate change on the Yucatan Peninsula during the Little Ice Age. Quat. Res. 63, 109–121 (2005).

Lund, D. C., Lynch-Stieglitz, J. & Curry, W. B. Gulf Stream density structure and transport during the past millennium. Nature 444, 601–604 (2006).

Zhang, P. et al. A test of climate, sun, and culture relationships from an 1810-year Chinese cave record. Science 322, 940–942 (2008).

Chiang, J. C. H., Zebiak, S. E. & Cane, M. A. Relative roles of elevated heating and surface temperature gradients in driving anomalous surface winds over tropical oceans. J. Atmos. Sci. 58, 1371–1394 (2001).

Wester, L., Juvik, J. & Holthu, P. Vegetation history of Washington Island (Teraina), Northern Line Islands. Atoll Res. Bull. 358, 1–50 (1992).

Saenger, C., Miller, M., Smittenberg, R. & Sachs, J. A physico-chemical survey of inland lakes and saline ponds: Christmas Island (Kiritimati) and Washington (Teraina) Islands, Republic of Kiribati. Sal. Syst. 2, 8 (2006).

Bauld, J. Occurrence of benthic microbial mats in saline lakes. Hydrobiology 81–82, 87–111 (1981).

Fenchel, T. Formation of laminated cyanobacterial mats in the absence of benthic fauna. Aquat. Microb. Ecol. 14, 235–240 (1998).

Sachse, D. & Sachs, J. P. Inverse relationship between D/H fractionation in cyanobacterial lipids and salinity in Christmas Island saline ponds. Geochim. Cosmochim. Acta 72, 793–806 (2008).

Gonfiantini, R. Handbook of Environmental Isotope Geochemistry (Elsevier, 1986).

Garcia-Pichel, F., Nubel, U. & Muyzer, G.. The phylogeny of unicellular, extremely halotolerant cyanobacteria. Arch. Microbiol. 169, 469–482 (1998).

Hamner, W. M. & Hamner, P. P. Stratified marine lakes of Palau (Western Caroline Islands). Phys. Geogr. 19, 175–220 (1998).

Hamner, W. M., Gilmer, R. W. & Hamner, P. P. The physical, chemical, and biological characteristics of a stratified, saline, sulfide lake in Palau. Limnol. Oceanogr. 27, 896–909 (1982).

Sessions, A. L., Burgoyne, T. W., Schimmelmann, A. & Hayes, J. M. Fractionation of hydrogen isotopes in lipid biosynthesis. Org. Geochem. 30, 1193–1200 (1999).

Zhang, Z. & Sachs, J. P. Hydrogen isotope fractionation in freshwater algae: I. Variations among lipids and species. Org. Geochem. 38, 582–608 (2007).

Volkman, J. K. et al. Microalgal biomarkers: A review of recent research developments. Org. Geochem. 29, 1163–1179 (1998).

Gat, J. R. Oxygen and hydrogen isotopes in the hydrologic cycle. Annu. Rev. Earth Planet. Sci. 24, 225–262 (1996).

Colinvaux, P. A. Climate and the Galápagos Islands. Nature 240, 17–20 (1972).

Zhang, Z., Metzger, P. & Sachs, J. P. Biomarker evidence for the co-occurrence of three races (A, B and L) of Botryococcus braunii in El Junco Lake, Galápagos. Org. Geochem. 38, 1459–1478 (2007).

Metzger, P., Berkaloff, C., Casadevall, E. & Coute, A. Alkadiene- and botryococcene-producing races of wild strains of Botryococcus braunii. Phytochemistry 24, 2305–2312 (1985).

Moy, C. M., Seltzer, G. O., Rodbell, D. T. & Anderson, D. M. Variability of El Nino/Southern Oscillation activity at millennial timescales during the Holocene epoch. Nature 420, 162–165 (2002).

Chiang, J. C. H., Cheng, W. & Bitz, C. M. Teleconnection mechanisms to the tropical Atlantic from an abrupt freshening of the North Atlantic Ocean. Geophys. Res. Lett. 35, L07704 (2008).

Takahashi, K. & Battisti, D. S. Processes controlling the mean tropical Pacific precipitation pattern. Part I: The Andes and the eastern Pacific ITCZ. J. Clim. 20, 3434–3451 (2007).

Chiang, J. C. H. & Bitz, C. M. Influence of high latitude ice cover on the marine Intertropical Convergence Zone. Clim. Dyn. 25, 477–496 (2005).

Bard, E., Raisbeck, G., Yiou, F. & Jouzel, J. Solar irradiance during the last 1200 years based on cosmogenic nuclides. Tellus B 52, 985–992 (2000).

Shindell, D. T., Schmidt, G. A., Miller, R. L. & Mann, M. E. Volcanic and solar forcing of climate change during the preindustrial era. J. Clim. 16, 4094–4107 (2003).

Ramsey, C. B. Deposition models for chronological records. Quat. Sci. Rev. 27, 42–60 (2008).

Druffel, E. R. M. Bomb radiocarbon in the Pacific: Annual and seasonal timescale variations. J. Mar. Res. 45, 667–698 (1987).

Geitler, L. Rabenhorst’s Kryptogamenflora von Deutschland, Österreich und der Schweiz: 14 (1985 reprint: Königstein, Koletz Scientific Books) (Akademische, 1932).

Komárek, J. & Anagnostidis, K. Süßwasserflora von Mitteleuropa (Gustav Fischer, 1999).

Komárek, J. & Anagnostidis, K. Süßwasserflora von Mitteleuropa (Gustav Fischer, 2005).

Smittenberg, R. H. & Sachs, J. P. Purification of dinosterol for hydrogen isotopic analysis using high-performance liquid chromatography–mass spectrometry. J. Chromatogr. A. 1169, 70–76 (2007).

Wallace, J. M., Mitchell, T. P. & Lau, A. K.-H. Legates/MSU precipitation climatology, < http://jisao.washington.edu/legates_msu/ > (1995).

Jones, P. D. & Mann, M. E. Climate over past millennia. Rev. Geophys. 42, RG2002 (2004).