Collins, James R; Marchetti, Adrian; Ducklow, Hugh W; Van Mooy, Benjamin A S (2018): Diffuse downwelling attenuation coefficients for Southern Ocean waters for wavelengths 290-700 nm [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.889858, In supplement to: Collins, James R; Fredricks, Helen F; Bowman, Jeff S; Ward, Collin P; Moreno, Carly; Longnecker, Krista; Marchetti, Adrian; Hansel, Colleen M; Ducklow, Hugh W; Van Mooy, Benjamin A S (2018): The molecular products and biogeochemical significance of lipid photooxidation in West Antarctic surface waters. Geochimica et Cosmochimica Acta, 232, 244-264, https://doi.org/10.1016/j.gca.2018.04.030
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Abstract:
Diffuse downwelling attenuation coefficients in Napierian form (DAC down) for Southern Ocean waters for wavelengths 290-700 nm. Coefficients for 320-700 nm were calculated directly from depth profiles of in situ irradiance made with an Ocean Optics Jaz spectrophotometer at PAL-LTER Station B, Arthur Harbor, Antarctica. The station is a 75 m deep sampling location about 1 km offshore. Due to the low signal-to-noise ratio in the in situ irradiance observations at wavelengths < 320 nm, coefficients were estimated for 290-320 nm using an exponential model fit to observed data from the 320-370 nm interval:
DAC down =e^(-0.0149 * lamda+3.60)
To achieve minimum boat shadow while making the irradiance profile measurements, the fiber optic cable and light sensor (cosine corrector) were streamed away from the small boat in a direction that was both to windward and toward the sun; the boat was then allowed to drift downwind from the measurement location to a suitable stand-off distance. A series of concurrent surface irradiance measurements made with a LI-COR PAR sensor (model LI-193SA; LI-COR Biosciences, Lincoln, NE, USA) was used to correct the spectra made as part of these profiles for any changes in incident light intensity that occurred between measurements.
Coverage:
Latitude: -64.779500 * Longitude: -64.072500
Event(s):
Comment:
Version 2, 2018-05-14.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Wavelength | Lambda | nm | Collins, James R | ||
| 2 | Diffuse attenuation coefficient, downward | Kd | 1/m | Collins, James R | Ocean Optics Jaz spectrophotometer | |
| 3 | Diffuse attenuation coefficient, downward, standard deviation | Kd std dev | ± | Collins, James R | Ocean Optics Jaz spectrophotometer | |
| 4 | Diffuse attenuation coefficient, downward | Kd | 1/m | Collins, James R | fitted |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3577 data points
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