Dendroclimatology from Regional to Continental Scales: Understanding Regional Processes to Reconstruct Large-Scale Climatic Variations Across theWestern Americas - Dendroclimatology - page 200

picture would be consistent with the Pacific-wide pattern proposed here.
Hence, it is suggested that the proxy-inferred warming of California coastal
SSTs and increasing western US precipitation around, roughly, AD 1400
resulted (at least in part) from increasing tropical Pacific SSTs and resulting
changes in tropical precipitation patterns. The question now arises whether
other transitions in the Nevada record (for example, around 400 BC, and in
the converse direction around AD 400) have similar causes.
—Nicholas E. Graham and Malcolm K. Hughes
Box Fig. 7.10 Proxy records from areas in the equatorial Pacific Ocean and its eastern mar-
gin (western North America) since 500 BC. Top Pl o t : extent of Mono Lake low stands (Stine
1994 ) green horizontal lines, and a long tree-ring chronology from the White Mountains of
California. Middle plot : Mg/Ca-based SST reconstruction from foraminifera near Mindanao
in the northwest equatorial Pacific. Scale inverted for comparison. Bottom Plot : yearly
values and period means ( horizontal blue lines ) of sea surface temperature (SST) (After
Graham et al. 2007 )