“…Four historical reconstructions of the boreal winter, December, January, February (DJF), SOI, were presented in B16 using methods of principal component regression (PCR) and composite-plus-scale (CPS). The logbook-based reconstructions were found to have good agreement with a Jakarta-based SOI, which uses rain-day counts, from 1830 to 1850 (Können et al 1998), suggesting a common signal from these early observationbased records. The reconstructions from ships' logbooks will here be compared to previous proxy and documentary-based reconstructions of ENSO, in order to add to the understanding of ENSO variability during the early to midnineteenth century.…”