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).

Figure 14A. Regressions show that Crater Lake Kd,320 and Kd,380 can be calculated from Kd,blue (400–500 nm) using data averaged over 0–40 m for July–August 1996–2002: Kd,320 = 1.65 * Kd,blue + 0.027, r2=0.66; Kd,380 = 1.16 * Kd,blue – 0.001, r2=0.92.

Figure 14B. Time series for Kd,320 and Kd,380 (0–40 m) in Crater Lake using direct radiometer measurements (1966, 1969, 1996–2002) and proxy derived from Kd,blue using blue-filter photometer data, (1940, 1969, 1980–1991). For 1966 Kd,380 was estimated from reported Ed,360–390nm vs depth (5–25m) yielding Kd,380=0.024; after adjustment for 0–40 m depth range using recent patterns of Kd versus depth (Figures 5 & 6), Kd,380= 0.027. For 1966 and 1969 the Kd,320 radiometer data were estimated from measured radiometer Kd,380 using Kd,320 = Kd,380 *