Figure 12B. Absorption ratios consistent with photo protection from UV-B in phytoplankton near the surface (MAA peak versus Chlorophyll-a red peak ratio follows attenuation trend for UV-B irradiance; Chlorophyll-a blue peak versus Chlorophyll-a red peak ratio remains constant with depth). Ratio of Fchl:cp660 shows photoacclimation as in Figure 11B.

Figure 13A. Crater Lake surface Chlorophyll-a (0–30 m average and 40–140 m average, retained on 0.45 micron filter) for July and August 1984–2002, and stratospheric ozone over Crater Lake during July and August (average of day 1–17 each month for latitude +43, longitude -122, source Nimbus-7 TOMS sensor, 1978–93, Earth Probe TOMS sensor, 1993–present, http://toms.gsfc.nasa.gov/teacher/ozone_overhead_archive_V8.html).

Figure 13B. Chlorophyll-a (1984–2002 averages for July & August, 0–30 m and 40–140 m retained on 0.45 micron filter) versus Stratospheric ozone (DU) averaged for first 17 days of the sample month (see Figure 13A for source). Regression equation for deep [Chlorophyll-a], y = 0.025x – 7.45 (r2 = 0.49); for shallow [Chlorophyll-a], y = 0.0037x – 1.07 (r2 = 0.27).