Table I
Ranges of Measured Values of Water Quality Parameters and Calculated Values of Spectrooptical Parameters
Month | Number of stns. | Chlcor (Chlunc) (mg/m3) | SM (g/m3) | Wavelength (nm) | c (m−1) | ω0 | F |
---|
May | 17 | 1.38–6.21 | 0.2–8.9 | 443 | 0.81–9.46 | 0.707–0.893 | 0.953–0.984 |
| | (1.48–6.74) | | 520 | 0.69–8.73 | 0.782–0.941 | 0.934–0.979 |
| | | | 550 | 0.68–8.58 | 0.788–0.956 | 0.927–0.980 |
| | | | 670 | 0.99–7.51 | 0.587–0.912 | 0.944–0.994 |
June | 13 | 1.51–6.91 | 0.2–0.9 | 443 | 1.14–2.86 | 0.728–0.834 | 0.973–0.992 |
| | (2.09–8.63) | | 520 | 0.98–2.53 | 0.807–0.873 | 0.971–0.990 |
| | | | 550 | 0.97–2.44 | 0.822–0.885 | 0.969–0.989 |
| | | | 670 | 1.33–2.82 | 0.686–0.801 | 0.979–0.996 |
July | 18 | 1.33–16.43 | 0.2–1.7 | 443 | 1.80–3.39 | 0.730–0.848 | 0.971–0.986 |
| | (1.68–17.28) | | 520 | 1.55–3.03 | 0.824–0.898 | 0.964–0.984 |
| | | | 550 | 1.49–2.95 | 0.846–0.911 | 0.962–0.981 |
| | | | 670 | 1.39–2.97 | 0.656–0.839 | 0.975–0.990 |
Aug. | 7 | 3.88–4.84 | 0.6–1.5 | 443 | 2.76–3.20 | 0.821–0.853 | 0.952–0.971 |
| | (4.23–5.11) | | 520 | 2.36–2.71 | 0.859–0.894 | 0.942–0.969 |
| | | | 550 | 2.27–2.59 | 0.871–0.895 | 0.946–0.964 |
| | | | 670 | 2.30–2.59 | 0.750–0.792 | 0.970–0.979 |
Sept. | 19 | 3.38–6.66 | 0.2–3.0 | 443 | 1.27–2.78 | 0.750–0.838 | 0.956–0.988 |
| | (3.58–7.23) | | 520 | 1.08–2.34 | 0.803–0.875 | 0.944–0.985 |
| | | | 550 | 1.05–2.22 | 0.813–0.879 | 0.943–0.985 |
| | | | 670 | 1.43–2.48 | 0.683–0.783 | 0.957–0.993 |
TABLE II
Optical Cross Sections Determined from Five-Component Model (May, June, Sept. Data)
Wavelength (nm) | aChl (m2/mg) | aSM (m2/g) | aNLO (m2/g) | INT (m−1) | Mean error and standard deviation of the errors (%) |
---|
443 | 0.0354 | 0.0557 | 0.0272 | 0.177 | +1.2, 13.2 |
520 | 0.0240 | 0.0281 | 0.0206 | 0.113 | +1.7, 13.7 |
550 | 0.0173 | 0.0185 | 0.00098 | 0.122 | +1.7, 13.2 |
670 | 0.0100 | 0.0225 | 0.0 | 0.379 | +0.4, 6.4 |
| (Bb)Chl (m2/mg) | (Bb)SM (m2/g) | (Bb)NLO (m2/g) | INT (m−1) | |
|
| |
443 | 0.00199 | 0.0328 | 0.00900 | −0.00156 | +9.2, 49.4 |
520 | 0.00182 | 0.0474 | 0.00756 | −0.00796 | −4.3, 49.0 |
550 | 0.00241 | 0.0525 | 0.00972 | −0.0128 | −7.5, 53.6 |
670 | 0.00175 | 0.0333 | 0.00472 | −0.00936 | −7.3, 58.1 |
| bChl (m2/mg) | bSM (m2/g) | bNLO (m2/g) | INT (m−1) | |
|
| |
443 | 0.128 | 0.682 | 0.398 | 0.230 | −0.1, 18.1 |
520 | 0.127 | 0.650 | 0.363 | 0.168 | −0.4, 18.8 |
550 | 0.128 | 0.643 | 0.351 | 0.151 | −0.6, 19.5 |
670 | 0.104 | 0.512 | 0.290 | 0.404 | +0.8, 18.1 |
Table III
Chlorophyll Absorption Cross Sections (m2/mg)
Wavelength (nm) | Smith and Baker (1979) | Morel and Prieur (1977) | Thalassiosira pseudonana Kiefer et al. (1979) | Monochrysis lutheri Kiefer et al. (1979) | Yentsch (1960) | Doerffer (1979) | Present Work |
---|
443 | 0.0293 | 0.0253 | 0.056 | 0.031 | 0.082 | 0.0282 | 0.0354 |
520 | 0.0143 | 0.0159 | 0.023 | 0.012 | 0.012 | | 0.0240 |
550 | 0.0090 | 0.0102 | 0.011 | 0.0074 | 0.007 | 0.0159 | 0.0173 |
670 | 0.0113 | 0.0203 | 0.0083 | 0.011 | 0.025 | | 0.0086 |
Table IV
Dissolved Matter Absorption Cross Sections
Wavelength (nm) | INT (m−1) | aw, water absorption coefficient (Hulbert115) (m−1) | INT-aw (m−1) | Dissolved matter cross section (m2/g carbon) |
---|
443 | 0.177 | 0.020 | 0.157 | 0.073 |
520 | 0.113 | 0.028 | 0.085 | 0.039 |
550 | 0.122 | 0.037 | 0.085 | 0.039 |
670 | 0.379 | 0.370 | 0.009 | 0.0042 |
Table V
Suspended Mineral Absorption Coefficients
Wavelength (nm) | Current work (cross section) (m2/g) | Current work (absorption for b = 2 m−1) (m−1) | Morel and Prieur (absorption for b = 2 m−1) (m−1) |
---|
443 | 0.0557 | 0.17 | 0.15 |
520 | 0.0281 | 0.087 | 0.070 |
550 | 0.0185 | 0.057 | 0.050 |
670 | 0.0225 | 0.070 | 0.095 |
Table VI
Optical Cross Sections Determined from Four-Component Model (May, June, Sept. Data)
Wavelength (nm) | aChl (m2/mg) | aSM (m2/g) | INT (m−1) | Mean error and standard deviation of the errors (%) |
---|
443 | 0.0343 | 0.0557 | 0.185 | +1.2, 13.3 |
520 | 0.0232 | 0.0281 | 0.119 | +1.8, 13.9 |
550 | 0.0173 | 0.0185 | 0.122 | +1.7, 13.2 |
670 | 0.0105 | 0.0221 | 0.383 | +0.4, 6.6 |
| (Bb)Chl (m2/mg) | (Bb)SM (m2/g) | INT (m−1) | |
|
| |
443 | 0.00163 | 0.0328 | 0.00103 | +9.8, 49.5 |
520 | 0.00153 | 0.0474 | −0.00578 | −7.0, 48.4 |
550 | 0.00202 | 0.0525 | −0.00998 | −6.9, 52.8 |
670 | 0.00156 | 0.0333 | −0.00800 | −6.9, 57.3 |
| bChl (m2/mg) | bSM (m2/g) | INT (m−1) | |
|
| |
443 | 0.112 | 0.683 | 0.344 | +0.5, 19.3 |
520 | 0.111 | 0.650 | 0.273 | +0.2, 20.0 |
550 | 0.114 | 0.643 | 0.252 | +0.1, 20.5 |
670 | 0.092 | 0.512 | 0.487 | +1.1, 19.0 |
Table VII
Comparison of Five- and Four-Component Model Absorption Cross Sections for Chlorophyll (m2/mg)
Wavelength (nm) | Five-component model
| Four component model
| Four component model
|
---|
|
|
|
---|
443 | 0.0354 | 0.0343 | 0.0341 |
520 | 0.0240 | 0.0232 | 0.0226 |
550 | 0.0173 | 0.0173 | 0.0166 |
670 | 0.0100 | 0.0105 | 0.0100 |
|
|
|
|
|
|
443 | 0.00199 | 0.00163 | 0.00138 |
520 | 0.00182 | 0.00153 | 0.00155 |
550 | 0.00241 | 0.00202 | 0.00213 |
670 | 0.00175 | 0.00156 | 0.00161 |
|
|
|
|
|
|
443 | 0.128 | 0.112 | 0.116 |
520 | 0.127 | 0.111 | 0.116 |
550 | 0.128 | 0.114 | 0.119 |
670 | 0.104 | 0.092 | 0.097 |
Table VIII
Mean Errors and the Standard Deviations for the Determination of Chlorophyll a and Suspended Mineral Concentrations Utilizing Optical Cross Sections Determined from the Five-Component and Four-Component Models
Water quality parameter | Five-component model
| Four-component model
|
---|
Mean error (%) | Standard deviation (%) | Mean error (%) | Standard deviation (%) |
---|
Corrected Chl a | +11 | 67 | +26 | 80 |
Uncorrected Chl a | | | +25 | 70 |
Total suspended solids (>0.3 g/m3) | +1 | 35 | −5 | 46 |