| Global warming harbinger |
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Earlier spring arrival |
Nenana, Alaska
Early river thaw. During 82 years on record, four out of the five earliest thaws on the Tanana River occurred in the 1990's.
Reference: NSIDC. 1998. The Nenana Ice Classic: Tanana River Ice Annual Breakup Dates. National Snow and Ice Data Center. Digital data available from nsidc@kryos.colorado.edu. Boulder, Colorado. NSIDC Distributed Active Archive
Center, University of Colorado at Boulder. http://www-nsidc.colorado.edu/
NASA/GUIDE/docs/
dataset_documents/
nenana_river_ice_breakup_
dataset_document.html
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