Citation:

PANGAEA.879578

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Replaced by:

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. PANGAEA, https://doi.org/10.1594/PANGAEA.889858

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^(-0.0152 * lamda+3.84)

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):

Palmer_StationB * Latitude: -64.779500 * Longitude: -64.072500 * Location: Arthur Harbour, Antarctica * Method/Device: Monitoring station (MONS)

Comment:

PLEASE NOTE: This is an old Version of data collection doi:10.1594/PANGAEA.879582, please refer to the newer Version (see "Replaced by" reference)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	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	Kd	1/m	Collins, James R	fitted

License:

Licensing unknown: Please contact principal investigator/authors to gain access and request licensing terms (UNKNOWN)

Size:

2477 data points

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