Table 3.
Impact of the reservoirs on temperature variables.
| Temperature threshold, Tthr | Krasnoyarsk reservoir | Sayano-Shushenskoe reservoir | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Near: MIN | Far: TASH | Near: CHER | Far: TASH | |||||||||
| 1936–1967 | 1968–2014 | ∆ | 1936–1967 | 1968–2014 | ∆ | 1951–1979 | 1980–2014 | ∆ | 1951–1979 | 1980–2014 | ∆ | |
| Date of stable temperature crossing Tthr in spring (days) | ||||||||||||
| 0 °C | 5 Apr ± 9 | 30 Mar ± 9 | − 6* | 8 Apr ± 9 | 3 Apr ± 9 | − 5* | 1 Apr ± 9 | 25 Mar ± 11 | − 7* | 7 Apr ± 8 | 2 Apr ± 9 | − 5* |
| 5 °C | 16 Apr ± 10 | 10 Apr ± 9 | − 6* | 17 Apr ± 8 | 14 Apr ± 10 | − 3 | 11 Apr ± 8 /) | 6 Apr ± 10 | − 5* | 17 Apr ± 8 | 13 Apr ± 10 | − 4 |
| 10 °C | 3 May ± 8 | 3 May ± 11 | 0 | 10 May ± 9 | 10 May ± 11 | 0 | 8 May ± 11 | 5 May ± 12 | − 3 | 11 May ± 9 | 9 May ± 11 | − 2 |
| Date of stable temperature crossing Tthr in autumn (days) | ||||||||||||
| 0 °C | 25 Oct ± 8 | 26 Oct ± 8 | + 1 | 22 Oct ± 8 | 24 Oct ± 9 | + 2 | 28 Oct ± 7 | 6 Nov ± 10 | + 9* | 21 Oct ± 9 | 26 Oct ± 9 | + 5* |
| 5 °C | 11 Oct ± 9 | 9 Oct ± 10 | − 2 | 6 Oct ± 9 | 6 Oct ± 8 | 0 | 16 Oct ± 9 | 21 Oct ± 9 | + 5* | 7 Oct ± 8 | 7 Oct ± 9 | 0 |
| 10 °C | 6 Sep ± 9 | 9 Sep ± 8 | + 3 | 31 Aug ± 9 | 1 Sep ± 7 | + 1 | 9 Sep ± 9 | 12 Sep ± 8 | + 3* | 1 Sep ± 8 | 3 Sep ± 6 | + 2 |
| Duration of season with temperature above Tthr (days) | ||||||||||||
| 0 °C | 202 ± 10 | 210 ± 11 | + 8* | 197 ± 10 | 204 ± 13 | + 7 | 211 ± 10 | 226 ± 15 | + 15* | 197 ± 11 | 207 ± 12 | + 10* |
| 5 °C | 178 ± 14 | 182 ± 14 | + 4 | 172 ± 11 | 176 ± 13 | + 4 | 188 ± 12 | 198 ± 15 | + 10* | 173 ± 10 | 177 ± 14 | + 4 |
| 10 °C | 113 ± 12 | 116 ± 14 | + 3 | 102 ± 15 | 104 ± 12 | + 2 | 115 ± 10 | 119 ± 15 | + 4* | 103 ± 13 | 106 ± 12 | + 3 |
| Sum of active temperatures above Tthr (°C·days) | ||||||||||||
| 0 °C | 2525 ± 144 | 2586 ± 135 | + 61 | 2213 ± 123 | 2287 ± 133 | + 74* | 2473 ± 104 | 2644 ± 138 | + 172* | 2205 ± 116 | 2321 ± 127 | + 116* |
| 5 °C | 1603 ± 132 | 1631 ± 109 | + 28 | 1317 ± 112 | 1367 ± 106 | + 50* | 1521 ± 97 | 1601 ± 114 | + 80* | 1318 ± 101 | 1389 ± 106 | + 71* |
| 10 °C | 875 ± 106 | 886 ± 93 | + 11 | 636 ± 84 | 666 ± 80 | + 30 | 2473 ± 104 | 2644 ± 138 | + 172* | 2205 ± 116 | 2321 ± 127 | + 116* |
For each reservoir and station (Minusinsk—MIN, Cheryomushki—CHER, Tashtyp—TAH), the first two columns show mean ± standard deviation over sub-periods before to after launching of the turbines; the third column (Δ) shows difference in means between sub-periods, significant (p < 0.05) differences are written in bold.