Souvermezoglou, Ekaterini; Krasakopoulou, Evangelia; Pavlidou, Alexandra (2008): Nutrient concentrations in water samples collected at Station MARCH-1997-GN36199704601MSB02 in the Aegean Sea [dataset]. Hellenic Center of Marine Research, Institut of Oceanography, Greece, PANGAEA, https://doi.org/10.1594/PANGAEA.684626
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Related to:
Souvermezoglou, Ekaterini; Krasakopoulou, Evangelia (2000): Chemical oceanography in the Cretan Sea: Changes associated to the transient. Mediterranean Marine Science, 1/2, 91-103, https://doi.org/10.12681/mms.292
Souvermezoglou, Ekaterini; Krasakopoulou, Evangelia (2002): High oxygen consumption rates in the deep layers of the north Aegean Sea. Mediterranean Marine Science, 3/1, 55-65, https://doi.org/10.12681/mms.258
Funding:
Coverage:
Latitude: 35.745000 * Longitude: 25.100000
Date/Time Start: 1997-03-06T00:00:00 * Date/Time End: 1997-03-06T00:00:00
Minimum DEPTH, water: 3 m * Maximum DEPTH, water: 1397 m
Event(s):
MARCH-1997-GN36199704601MSB02 * Latitude: 35.745000 * Longitude: 25.100000 * Date/Time: 1997-03-06T00:00:00 * Method/Device: Bottle, Niskin 8-L (NIS_8L)
Comment:
For oxygen determination samples were analysed on board immediately after collection with the Winkler method according to Carpenter (1965a, 1965b). Titration was done with a Metrohm Dosimat 665 automatic burette. Precision of the method is estimated at 0.05 ml O2/l.
Apparent oxygen utilisation (AOU) was calculated according to difference of measured oxygen values and oxygen saturation given by the equations of Benson and Krause (1984), which are recommended by Millero (1986).
Percentage of oxygen saturation in water was calculated from the following equation (at temperature 0-40ºC and salinity 0-40 promille): %O2 = (O2/O2') X100, where O2 is oxygen concentration in a sample, O2' is oxygen solubility in sea water at the same temperature and salinity as in the sample.
Samples for determination of nutrients were collected in 100 ml polyethylene bottles and kept continuously under deep freeze (-20°C ) until analysis in the laboratory.
Nitrate and nitrite were analysed by a Bran and Luebbe Autoanalyser II according to the procedure of Treguer and Le Corre (1975).
Phosphate was measured by a Perkin Elmer Lambda 2S UV/VIS Spectrometer according to the method described by Murphy and Riley (1962).
Precision is estimated at ±0.1 µmol/l for nitrate and ±0.02 µmol/l for phosphate and nitrite.
Detection limit was 0.08 µmol/l for nitrate and nitrite and 0.01 µmol/l for phosphate.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, water | Depth water | m | Geocode | ||
| 2 | Oxygen | O2 | µmol/l | Souvermezoglou, Ekaterini | Dissolved oxygen with modified Winkler (Carpenter, 1965) | |
| 3 | Oxygen, apparent utilization | AOU | µmol/l | Souvermezoglou, Ekaterini | Calculated, in situ oxygen concentration and in situ oxygen saturation | |
| 4 | Oxygen saturation | O2 sat | % | Souvermezoglou, Ekaterini | Calculated, in situ oxygen concentration and in situ oxygen saturation | |
| 5 | Phosphate | [PO4]3- | µmol/l | Souvermezoglou, Ekaterini | Determination of phosphate (Murphy & Riley, 1962) | |
| 6 | Silicate | Si(OH)4 | µmol/l | Souvermezoglou, Ekaterini | Dissolved silica, colorimetric (Mullin & Riley, 1955) | |
| 7 | Nitrite | [NO2]- | µmol/l | Souvermezoglou, Ekaterini | Determination of nitrite (Bendschneider & Robinson, 1952, J Mar Res, 11:87-96) | |
| 8 | Nitrate | [NO3]- | µmol/l | Souvermezoglou, Ekaterini | Seawater analysis (Strickland & Parsons, 1968) |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
160 data points
Data
| 1 Depth water [m] | 2 O2 [µmol/l] | 3 AOU [µmol/l] | 4 O2 sat [%] | 5 [PO4]3- [µmol/l] | 6 Si(OH)4 [µmol/l] | 7 [NO2]- [µmol/l] | 8 [NO3]- [µmol/l] |
|---|---|---|---|---|---|---|---|
| 3 | 233.914 | 12.447 | 94.948 | 0.028 | 1.558 | 0.374 | 2.835 |
| 5 | 233.065 | 13.775 | 94.420 | 0.017 | 1.388 | 0.431 | 0.951 |
| 10 | 234.003 | 13.406 | 94.582 | 0.012 | 1.469 | 0.512 | 0.713 |
| 20 | 233.423 | 14.047 | 94.324 | 0.023 | 1.382 | 0.393 | 0.512 |
| 30 | 233.199 | 14.345 | 94.205 | 0.017 | 1.401 | 0.343 | 0.507 |
| 40 | 232.351 | 15.203 | 93.859 | 0.023 | 1.264 | 0.418 | 0.599 |
| 50 | 232.798 | 14.789 | 94.027 | 0.033 | 1.229 | 0.330 | 1.032 |
| 75 | 231.949 | 15.662 | 93.675 | 0.023 | 1.439 | 0.374 | 0.861 |
| 100 | 229.450 | 18.216 | 92.645 | 0.012 | 1.585 | 0.462 | 0.833 |
| 120 | 224.941 | 22.802 | 90.796 | 0.039 | 1.747 | 0.311 | 0.892 |
| 150 | 210.031 | 38.939 | 84.360 | 0.039 | 2.838 | 0.073 | 2.570 |
| 200 | 201.639 | 48.668 | 80.557 | 0.039 | 3.653 | 0.092 | 3.472 |
| 300 | 206.594 | 44.066 | 82.420 | 0.050 | 3.721 | 0.079 | 3.346 |
| 400 | 209.719 | 41.203 | 83.579 | 0.044 | 3.086 | 0.054 | 2.534 |
| 500 | 212.710 | 38.650 | 84.624 | 0.039 | 3.262 | 0.167 | |
| 600 | 217.397 | 34.339 | 86.359 | 0.087 | 3.297 | 0.236 | 2.788 |
| 700 | 216.950 | 34.908 | 86.140 | 0.071 | 2.727 | 0.092 | 2.249 |
| 800 | 218.468 | 33.457 | 86.720 | 0.098 | 4.460 | 0.267 | 3.028 |
| 1000 | 216.415 | 35.721 | 85.833 | 0.087 | 4.204 | 0.186 | 3.017 |
| 1100 | 217.308 | 34.986 | 86.133 | 0.109 | 4.528 | 0.223 | 3.070 |
| 1200 | 217.397 | 34.891 | 86.170 | 0.098 | 4.798 | 0.788 | 3.131 |
| 1300 | 217.665 | 34.576 | 86.293 | 0.119 | 5.130 | 0.311 | 3.095 |
| 1397 | 215.477 | 36.832 | 85.402 | 0.114 | 5.346 | 0.249 | 3.165 |