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Tarbagatay Mts.
BorshchovochnyMountainsy
Beijing
Tokyo
Change in snow cover
2000-2021
More
Unchanged
Less
SCALE VARIES IN THIS PERSPECTIVE.
OCT
First snow day
Tarbagata
Brooks Range U.
Sk
- 8
-3
+1
A
B
C
Snowfall varies by region and is influenced by factors such as
latitude, elevation, humidity, and proximity to oceans or lakes. Rising
air temperatures boost humidity levels, and winter precipitation
increasingly falls as rain instead of snow. Low-elevation and coastal
areas are especially at risk of reduced snowfall.
WARMING
GLOBE,
WANING
WINTER
SNOWFALL IS DECREASING IN MOUNTAIN RANGES
AROUND THE WORLD, DRASTICALLY IN SOME REGIONS.
VITAL TO ECOSYSTEMS AND ECONOMIES, SNOW AND
ICE LEVELS AFFECT TOURISM, HYDROPOWER
PRODUCTION, AND WATER SUPPLIES IN MANY PARTS OF
THE WORLD. SCIENTISTS ARE TRACKING THE CHANGES,
AND INNOVATORS ARE SEARCHING FOR SOLUTIONS.
BY MATTHEW W. CHWASTYK, MANUEL CANALES,
AND ALEXANDER STEGMAIER
In many mountain ranges the first snow is
arriving later in the year and the last snow
earlier. The ranges at right have shown some
of the largest changes in the last snow day
over the past 21 years.
COUNTING THE SNOW DAYS
Snow-cover data from satellites are helping scientists record
- Nearly 80 percent of the world’s mountain ranges are
decline in snow-covered area and fewer days of snow on the
TRACKING A CHANGIN
Day lost Day gained
Increasing air
temperature
Coastal
proximity
Rising
humlevelsidity
ERIC KNIGHT; MNASA/JPL; NOAA; NATIONAL SNOWATTHEW TWOMBLY. SOURCES: CLAUDIA NOTARNICOLA, EURAC RESEARCH; AND ICE DATA CENTER