《科学》[Science]12年5月4日出版pdf全文

nero1981

. T& e! o2 s) H2 ]" [: ]1 cCOVER A jumble of icebergs forms in front of the heavily crevassed * b5 E6 B  i8 g& r
calving front of Jakobshavn Isbr?, one of the fastest outlet glaciers draining 5 w9 `# r# b- F# J
the Greenland Ice Sheet. The ~5-kilometer-wide ice front rises ~80 meters out of ' t# t  R( `7 z5 s# U) a, F
the water and extends more than 600 meters underwater. Recent research shows 3 b* N9 p( G! k1 r9 t% y
that the speeds of Greenland glaciers are increasing. See page 576. Photo:
) G* q7 T+ B! \2 d5 K$ rIan Joughin 8 H; b, V; f3 \  a0 M1 S% K' p  d6 ~" G
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