Note: Salinity in
San Francisco Bay is very strongly and inversely correlated with the flow
of the rivers, principally the Sacramento-San Joaquin, that empty into
the bay. So this reconstruction of salinity levels also provides information
about variability in the aggregate flow of these rivers.
Gaged (blue)
and reconstructed (green) salinity records over the calibration/validation
period (1922-1994). The record is missing values for 1946 and 1948.
The reconstruction was calibrated only on the period 1922-1952 because
depletions from the Sacramento-San Joaquin Rivers increasingly impact
the salinity record after 1952, as indicated by the consistent underestimation
of salinity values after 1960 in the reconstruction.
Full reconstruction
(1409-2003), with annual values (green) and a 5-year running mean (black).
Total sample
depth (typically, two measured series per tree) for the reconstruction.
Validation
Statistics
(See Blue River Case Study for detailed explanation)
| |
| |
Rcal |
Rval |
| calibration model |
0.904 |
|
| PRESS validation |
|
0.893 |
|
|
| |
R2cal |
RE(val) |
| calibration model |
0.818 |
|
| PRESS validation |
|
0.797 |
|
|
| |
standard error of estimate |
RMSE |
| calibration model |
1.063 |
|
| PRESS validation |
|
1.086
|
|
|
