However, some of the discoveries dug up were as alien as the rocks transported to
the site by glaciers millions of years ago.
Not exact matches
In the U.S. this is perhaps most famously observed in Glacier National Park, where the terminus of
glaciers have retreated
by several kilometers in the past century, and could be gone before the next century (see e.g. the USGS web
site, here, and here).
By early July snowpack beyond the
glacier margins is limited, Snotel
sites have lost their snowcover, and yet streamflow is still heavily dependent on snow and ice melt from
glaciers (Fountain and Tangborn, 1985; Pelto, 1996).
Because all of the
sites are accessed
by backpacking, it has not been a problem to reach each
glacier at the right date.
At Zuoqiupu
glacier — a bellwether
site on the southern edge of the plateau and downwind from the Indian subcontinent — black soot deposition increased
by 30 percent between 1990 and 2003.
These methods include inference of surface temperature change from vertical temperature profiles in the ground (bore holes) at many
sites around the world, rate of
glacier retreat at many locations, and studies
by several groups of the effect of urban and other local human influences on the global temperature record.