Diffuse downwelling attenuation coefficients (Napierian) for Southern Ocean waters for wavelengths 290-700 nm


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.

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)

DOI https://doi.org/10.1594/PANGAEA.879578
Related Identifier https://doi.org/10.1594/PANGAEA.889858
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.879578
Creator Collins, James R ORCID logo; Marchetti, Adrian ORCID logo; Ducklow, Hugh W; Van Mooy, Benjamin A S
Publisher PANGAEA
Publication Year 2017
Rights Licensing unknown: Please contact principal investigator/authors to gain access and request licensing terms; Data access is restricted (moratorium, sensitive data, license constraints)
OpenAccess false
Resource Type Dataset
Format text/tab-separated-values
Size 2477 data points
Discipline Earth System Research
Spatial Coverage (-64.073 LON, -64.779 LAT); Arthur Harbour, Antarctica