Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Holocene tropical climate variability. Holocene δ18O ice-core records recovered from Huascarán (23) (A) and Kilimanjaro (8) (B) along with tropical Northern Hemisphere (N.H.) insolation change from the present (33) (C), methane records from Greenland (37) and Antarctica (38) (D), and the Soreq Cave δ18O record (43) (E). GRIP, Greenland Ice Core Project; ppbv, parts per billion by volume.
