Concept

Optical properties

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URI	http://vocab.nerc.ac.uk/collection/P03/current/D015/1/
Within Vocab	SeaDataNet Agreed Parameter Groups
Alternative Labels
Definition	This APG contains parameters pertaining to the optical properties of seawater. Assigning parameters to this group encounters two areas of difficulty. Optical techniques, such as transmissometers and nephelometers, are used to quantify SPM concentration. The 'usual' parameter for transmissometer measurements is optical attenuance (or its natural log), which is clearly an optical property. Consequently, attenuance, percentage transmission and their precursor voltages have been included in this APG. However, the usual calibrated parameter from a nephelometer is turbidity, which is clearly more closely related to the suspended load of the water column. Consequently, nephelometer parameters, including raw voltages, have been included in the Suspended Particulate Matter APG. Light intensity, such as downwelling irradiance, may be measured by sensors placed either above or below the surface of the water. It might be argued that the latter belonged in the Meteorology APG. However, some irradiance records include measurements both above and below the sea surface to quantify light loss across the air-sea interface. Consequently, both surface and subsurface irradiance have been placed in the Optical Properties APG.
Date	2003-06-10T15:23:21
Identifier	SDN:P03::D015
Note	accepted
Is Version Of	D015
version	1
Broader	`P08:DS03`	Physical oceanography
	`P23:MD005`	Physical Oceanography
	OD1 ODATIS aggregation parameters and Essential Variable names - (3) [+]
	`OD1:COLOUR`	Ocean colour
	`OD1:RADFLX`	Radiative flux
	`OD1:TURBID`	Turbidity
	P02 SeaDataNet Parameter Discovery Vocabulary - (11) [+]
	`P02:BLUM`	Bioluminescence parameters
	`P02:PPAB`	Light absorption in the water column
	`P02:EXCO`	Light extinction and diffusion coefficients
	`P02:R410`	Ocean colour and earth-leaving visible waveband spectral radiation
	`P02:OPBS`	Optical backscatter
	`P02:LVLT`	Raw light meter output
	`P02:TVLT`	Raw suspended particulate material concentration sensor output
	`P02:SECC`	Secchi disk depth
	`P02:ATTN`	Transmittance and attenuance of the water column
	`P02:VSRA`	Visible waveband radiance and irradiance measurements in the atmosphere
	`P02:VSRW`	Visible waveband radiance and irradiance measurements in the water column
Related	`P02:WQBI`	Water quality bioindicators

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