This paper presents a high-resolution ice-core pollen record from the Sajama Ice Cap, Bolivia, that spans the last 400 yr. The pollen record corroborates the oxygen isotopic and ice accumulation records from the Quelccaya Ice Cap and supports the scenario that the Little Ice Age (LIA) consisted of two distinct phases—a wet period from AD 1500 to 1700, and a dry period from AD 1700 to 1880. Duri...

We present paleoclimate evidence for rapid ( < 100 years) shifts of f 2–4 jC in Chesapeake Bay (CB) temperature f2100, 1600, 950, 650, 400 and 150 years before present (years BP) reconstructed from magnesium/calcium (Mg/Ca) paleothermometry. These include large temperature excursions during the Little Ice Age (f1400–1900 AD) and the Medieval Warm Period (f800–1300 AD) possibly related to change...

Changes in climate during the Roman Warm Period (RWP, 1–250 CE) and Late Antique Little Ice Age (LALIA, 536–660 play a critical role early societal evolution, but differences between these two periods possible causes of changes remain poorly explored. Here we use LOch–Vecode-Ecbilt-CLio-agIsM model Large Common Era Ensemble with 70 members to examine change over intervals compare results this e...