Scientific Investigations Report 2006–5209
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2006–5209
Table 15. Distribution statistics of water column averages of chlorophyll a, ammonia-N, dissolved oxygen, and temperature at Midnorth site, based on July–August sampling dates, Upper Klamath Lake, Oregon, 1990–2004.
[Water-quality data are biweekly values of chlorophyll a and nutrients, and biweekly profiles of dissolved oxygen collected by the Klamath Tribes at Eagle Ridge in Upper Klamath Lake during July and August 1990–2004. Quartile: Q1, first quartile; Q2, second quartile; Q3, third quartile; Q4, fourth quartile. Abbreviations: mg/L, milligram per liter; ºC, degree Celsius; µg/L, microgram per liter]
| Water column averaged value | ||||
|---|---|---|---|---|
| Dissolved oxygen (mg/L) |
Temperature (°C) |
Chlorophyll a (µg/L) |
Ammonia-N (µg/L) |
|
| Percentile | ||||
| 95th | 10.1 | 23.1 | 252 | 982 |
| 90th | 9.3 | 22.7 | 240 | 952 |
| 75th | 8.8 | 21.8 | 159 | 520 |
| 50th | 7.8 | 20.4 | 107 | 121 |
| 25th | 6.2 | 19 | 65 | 21 |
| 10th | 4.5 | 17.6 | 37 | 5 |
| 5th | 4 | 17.2 | 13 | 5 |
| Values on dates closest to fish die-offs | ||||
| 07-28-03 | 1.86 | 24.36 | 7 | 873 |
| Quartile | Q1 | Q4 | Q1 | Q4 |
| 08-20-96 | 5.33 | 20.05 | 52 | 757 |
| Quartile | Q1 | Q3 | Q1 | Q4 |
| 08-12-97 | 4.49 | 21.51 | 36 | 640 |
| Quartile | Q1 | Q3 | Q1 | Q4 |
U.S.
Department of the Interior | U.S. Geological
Survey
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