Based on the information above, you would generally expect winter mass balance measurements to be values and summer mass balance values would tend to be values. O negative; negative O positive; negative O negative; positive O positive; positive
Based on the information above, you would generally expect winter mass balance measurements to be values and summer mass balance values would tend to be values. O negative; negative O positive; negative O negative; positive O positive; positive
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Transcribed Image Text:The USGS measures accumulation and ablation using a network of stakes distributed over the glacier (fig. 4). USGS scientists visit each site in spring and autumn
(sometimes more often) to keep a running tally of accumulation and ablation for each stake. These stake measurements, along with local temperature and
precipitation data, allow USGS scientists to estimate the glacier net balance, as well as the seasonal winter (total accumulation) and summer (total ablation) balances
that sum to the net balance. The cumulative net mass balance describes long-term trends in the glacier shape and size, that is, whether the glacier is growing or
shrinking.
Setting a measurement stake at South Cascade Glacier, Washington.
Based on the information above, you would generally expect winter mass balance measurements to be
values and summer mass balance values would tend
to be
values.
O negative; negative
O positive; negative
O negative; positive
O positive; positive
Transcribed Image Text:Question 2
100 pts
Net
accumulation
of snow
Net melting
(ablation)
Melting
and
iceberg
calving
Diagram of a glacier showing components of mass balance.
The USGS measures accumulation and ablation using a network of stakes distributed over the glacier (fig. 4). USGS scientists visit each site in spring and autumn
(sometimes more often) to keep a running tally of accumulation and ablation for each stake. These stake measurements, along with local temperature and
precipitation data, allow USGS scientists to estimate the glacier net balance, as well as the seasonal winter (total accumulation) and summer (total ablation) balances
that sum to the net balance. The cumulative net mass balance describes long-term trends in the glacier shape and size, that is, whether the glacier is growing or
shrinking.
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