a_water_wopp: Absorption coefficient of liquid water

In AlexCast/rho: R Hydrology Optics

Description

A harmonized dataset containing multi-source data of absorption coefficient of liquid water at 0 salinity and 20 degreesC, from 300 nm to 4000 nm in steps of 2 nm. This dataset combines the measurements of several sources listed below, harmonized to a standard temperature by using the absorption derivative with respect to temperature (Röttgers, 2010). The derivative with respect to temperature and salinity (Röttgers, 2010) are also provided. The dataset is taken from the absorption coefficient Version 3 of the Water Optical Properties Processor (WOPP) and fully documented in Röttgers et al. (2011).

Usage

a_water_wopp

Format

A matrix with 1851 rows and 7 variables:

wavelength

wavelength, in nm

a

absorption coefficient of water, 1/m

da/dS

absorption derivative with respect to salinity, 1/m 1/PSU

da/dT

absorption derivative with respect to temperature, 1/m 1/degreeC

sigma_a

standard deviation of a

sigma_da/dS

standard deviation of da/dS

sigma_da/dT

standard deviation of da/dT

Details

This is the base data used by functions n_water to retrieve the imaginary part of the refractive index of water and by function a_water to retrieve the temperature and salinity dependent absorption of pure (saline) water.

The sources used in the compilation were:

• Lu (2006);

• Mason et al. (2016; < 550 nm);

• Max & Chapados (2009; 1850-2000 nm, > 2500 nm);

• Pope & Fry (1997);

• Segelstein (1981; > 700 nm);

• Wang (2008);

• Wieliczka et al. (1989).

Source

WOPP - Water Optical Properties Processor, Version 1.7, 2016.

References

Lu, Z. 2006. Optical absorption of pure water in the blue and ultraviolet. Ph. D. thesis. Texas A&M University.

Mason, J. D.; Cone, M. T.; Fry, E. S. 2016. Ultraviolet (250-550 nm) absorption spectrum of pure water. Applied Optics 55, 25, 7163-7172. DOI: 10.1364/AO.55.007163

Max, J. J.; Chapados, C. 2009. Isotope effects in liquid water by infrared spectroscopy. III. H2O and D2O spectra from 6000 to 0 cm-1. Journal of Chemical Physics 131, 184505. DOI: 10.1063/1.3258646

Pope, R. M.; Fry, E. S. 1997. Absorption spectrum (380-700 nm) of pure water: II. Integrating cavity measurements. Applied Optics 36, 33, 8710-8723. DOI: 10.1364/AO.36.008710

Röttgers, R. 2010. Measurements of inherent optical properties of pure water. Technical note, STSE-WaterRadiance D5, ESA.

Röttgers, R.; Doerffer, R.; McKee, D.; Schönfeld, W. 2011. The Water Optical Properties Processor (WOPP). Pure water spectral absorption, scattering, and real part of refractive index model. Algorithm Theoretical Basis Document.

Segelstein, D. J. 1975. The complex refractive index of water. Master Thesis, University of Missouri-Kansas City, 175 pp.

Wang, L. 2008. Measuring optical absorption coefficient of pure water in UV using the integrating cavity absorption meter. Ph. D. thesis. Texas A&M University.

Wieliczka, D. M.; Weng, S.; Querry, M. R. 1989. Wedge shaped cell for highly absorbent liquids: infrared optical constants of water. Applied Optics 28, 9, 1714-1719. DOI: 10.1364/AO.28.001714

AlexCast/rho documentation built on Dec. 14, 2021, 9:47 a.m.