On the right is Mann et al Fig 1, showing the location of its proxy series. On the left, I’ve provided a blow up Africa, where three proxies are shown. The figure on the right color codes proxies by start date and type. The light blue square is an ice core series starting in the mid-first millennium: it may be identified as Thompson’s Mt Kilimanjaro series, about which we’ve posted in the past. The light green triangle is a sediment series starting around 1000 and can be immediately identified as Verschuren’s Lake Naivasha series.
The interesting puzzle for you is the series denoted by the orange star. The star symbol denotes a documentary series, the orange color a start date somewhere around AD1400. The BBC program mentioned that Mann had been scouring the world for proxies, but his discovery of documentary climate records for the plains of
Kenya Tanzania (Update – OK, OK) going back to the time of Columbus are important not just for climate studies, but for world history. Just so that readers do not under-estimate the importance of Mann’s discovery: I have verified that this is not a simple mislabeling of a local African proxy series as a documentary record. This is a genuine documentary series.
PS. I have provided several clues to assist readers in the identification of this series.