And if those other factors are affecting things since 1940 (or 1960, take your pick), then not only do the researchers using the tree - rings
as proxies for temperature need to delineate what is going on since then, but they have to then project that backward, too — and show all the reasons for all of that and then show the new, corrected, results of the past, as the proxy picture shows it.
Not exact matches
If this is accepted
as a reasonable looking
proxy for ocean heat content which matches the instrumental OHC record pretty well, then no «lag» is
needed to explain the solar effect on OHC and thus global surface
temperature.
Similar decadal and multidecadal cycles have being observed in numerous climatic
proxy models
for centuries and millennia,
as documented in the references of my papers, although the
proxy models
need to be studied with great care because of the large divergence from the
temperature they may present.