- (B) Stratospheric ozone depletion describes two distinct but related
phenomena observed since the late 1970s: a steady decline of about 4% per
decade in the total volume of ozone in Earth’s stratosphere (the ozone layer),
and a much larger springtime decrease in stratospheric ozone over Earth’s
polar regions (“ozone hole”). Effects of decreases in stratospheric ozone that
result in increased UV radiation reaching Earth include: (1) reduction in the
growth and population of phytoplankton; (2) damage to DNA of
phytoplankton; (3) reduced numbers of phytoplankton, so less krill is
available for higher-order consumers; (4) reduction in leaf growth and
surface area; and (5) decrease in photosynthetic activity.
marvins-underground-k-12
(Marvins-Underground-K-12)
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