Determination of the absorption coefficient of chromophoric dissolved organic matter from underway spectrophotometry

Giorgio Dall'Olmo, Robert J. W. Brewin, Francesco Nencioli, Emanuele Organelli, Ina Lefering, David McKee, Rüdiger Röttgers, Catherine Mitchell, Emmanuel Boss, Annick Bricaud, Gavin Tilstone

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Measurements of the absorption coefficient of chromophoric dissolved organic matter (ay) are needed to validate existing ocean-color algorithms. In the surface open ocean, these measurements are challenging because of low ay values. Yet, existing global datasets demonstrate that ay could contribute between 30% to 50% of the total absorption budget in the 400–450 nm spectral range, thus making accurate measurement of ay essential to constrain these uncertainties. In this study, we present a simple way of determining ay using a commercially-available in-situ spectrophotometer operated in underway mode. The obtained ay values were validated using independent collocated measurements. The method is simple to implement, can provide measurements with very high spatio-temporal resolution, and has an accuracy of about 0.0004 m−1 and a precision of about 0.0025 m−1 when compared to independent data (at 440 nm). The only limitation for using this method at sea is that it relies on the availability of relatively large volumes of ultrapure water. Despite this limitation, the method can deliver the ay data needed for validating and assessing uncertainties in ocean-colour algorithms.
LanguageEnglish
PagesA1079-A1095
Number of pages17
JournalOptics Express
Volume25
Issue number24
DOIs
Publication statusPublished - 31 Oct 2017

Fingerprint

dissolved organic matter
spectrophotometry
absorptivity
oceans
color
spectrophotometers
temporal resolution
budgets
availability
high resolution
water

Keywords

  • absorption coefficients
  • ultrapure water
  • oceal colour algorithms

Cite this

Dall'Olmo, G., Brewin, R. J. W., Nencioli, F., Organelli, E., Lefering, I., McKee, D., ... Tilstone, G. (2017). Determination of the absorption coefficient of chromophoric dissolved organic matter from underway spectrophotometry. Optics Express, 25(24), A1079-A1095. https://doi.org/10.1364/OE.25.0A1079
Dall'Olmo, Giorgio ; Brewin, Robert J. W. ; Nencioli, Francesco ; Organelli, Emanuele ; Lefering, Ina ; McKee, David ; Röttgers, Rüdiger ; Mitchell, Catherine ; Boss, Emmanuel ; Bricaud, Annick ; Tilstone, Gavin. / Determination of the absorption coefficient of chromophoric dissolved organic matter from underway spectrophotometry. In: Optics Express. 2017 ; Vol. 25, No. 24. pp. A1079-A1095.
@article{752883b691dd46d28a3d4cff4fff431b,
title = "Determination of the absorption coefficient of chromophoric dissolved organic matter from underway spectrophotometry",
abstract = "Measurements of the absorption coefficient of chromophoric dissolved organic matter (ay) are needed to validate existing ocean-color algorithms. In the surface open ocean, these measurements are challenging because of low ay values. Yet, existing global datasets demonstrate that ay could contribute between 30{\%} to 50{\%} of the total absorption budget in the 400–450 nm spectral range, thus making accurate measurement of ay essential to constrain these uncertainties. In this study, we present a simple way of determining ay using a commercially-available in-situ spectrophotometer operated in underway mode. The obtained ay values were validated using independent collocated measurements. The method is simple to implement, can provide measurements with very high spatio-temporal resolution, and has an accuracy of about 0.0004 m−1 and a precision of about 0.0025 m−1 when compared to independent data (at 440 nm). The only limitation for using this method at sea is that it relies on the availability of relatively large volumes of ultrapure water. Despite this limitation, the method can deliver the ay data needed for validating and assessing uncertainties in ocean-colour algorithms.",
keywords = "absorption coefficients, ultrapure water, oceal colour algorithms",
author = "Giorgio Dall'Olmo and Brewin, {Robert J. W.} and Francesco Nencioli and Emanuele Organelli and Ina Lefering and David McKee and R{\"u}diger R{\"o}ttgers and Catherine Mitchell and Emmanuel Boss and Annick Bricaud and Gavin Tilstone",
note = "{\circledC} 2017 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.",
year = "2017",
month = "10",
day = "31",
doi = "10.1364/OE.25.0A1079",
language = "English",
volume = "25",
pages = "A1079--A1095",
journal = "Optics Express",
issn = "1094-4087",
publisher = "Optical Society of America",
number = "24",

}

Dall'Olmo, G, Brewin, RJW, Nencioli, F, Organelli, E, Lefering, I, McKee, D, Röttgers, R, Mitchell, C, Boss, E, Bricaud, A & Tilstone, G 2017, 'Determination of the absorption coefficient of chromophoric dissolved organic matter from underway spectrophotometry' Optics Express, vol. 25, no. 24, pp. A1079-A1095. https://doi.org/10.1364/OE.25.0A1079

Determination of the absorption coefficient of chromophoric dissolved organic matter from underway spectrophotometry. / Dall'Olmo, Giorgio; Brewin, Robert J. W.; Nencioli, Francesco; Organelli, Emanuele; Lefering, Ina; McKee, David; Röttgers, Rüdiger; Mitchell, Catherine; Boss, Emmanuel; Bricaud, Annick; Tilstone, Gavin.

In: Optics Express, Vol. 25, No. 24, 31.10.2017, p. A1079-A1095.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Determination of the absorption coefficient of chromophoric dissolved organic matter from underway spectrophotometry

AU - Dall'Olmo, Giorgio

AU - Brewin, Robert J. W.

AU - Nencioli, Francesco

AU - Organelli, Emanuele

AU - Lefering, Ina

AU - McKee, David

AU - Röttgers, Rüdiger

AU - Mitchell, Catherine

AU - Boss, Emmanuel

AU - Bricaud, Annick

AU - Tilstone, Gavin

N1 - © 2017 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

PY - 2017/10/31

Y1 - 2017/10/31

N2 - Measurements of the absorption coefficient of chromophoric dissolved organic matter (ay) are needed to validate existing ocean-color algorithms. In the surface open ocean, these measurements are challenging because of low ay values. Yet, existing global datasets demonstrate that ay could contribute between 30% to 50% of the total absorption budget in the 400–450 nm spectral range, thus making accurate measurement of ay essential to constrain these uncertainties. In this study, we present a simple way of determining ay using a commercially-available in-situ spectrophotometer operated in underway mode. The obtained ay values were validated using independent collocated measurements. The method is simple to implement, can provide measurements with very high spatio-temporal resolution, and has an accuracy of about 0.0004 m−1 and a precision of about 0.0025 m−1 when compared to independent data (at 440 nm). The only limitation for using this method at sea is that it relies on the availability of relatively large volumes of ultrapure water. Despite this limitation, the method can deliver the ay data needed for validating and assessing uncertainties in ocean-colour algorithms.

AB - Measurements of the absorption coefficient of chromophoric dissolved organic matter (ay) are needed to validate existing ocean-color algorithms. In the surface open ocean, these measurements are challenging because of low ay values. Yet, existing global datasets demonstrate that ay could contribute between 30% to 50% of the total absorption budget in the 400–450 nm spectral range, thus making accurate measurement of ay essential to constrain these uncertainties. In this study, we present a simple way of determining ay using a commercially-available in-situ spectrophotometer operated in underway mode. The obtained ay values were validated using independent collocated measurements. The method is simple to implement, can provide measurements with very high spatio-temporal resolution, and has an accuracy of about 0.0004 m−1 and a precision of about 0.0025 m−1 when compared to independent data (at 440 nm). The only limitation for using this method at sea is that it relies on the availability of relatively large volumes of ultrapure water. Despite this limitation, the method can deliver the ay data needed for validating and assessing uncertainties in ocean-colour algorithms.

KW - absorption coefficients

KW - ultrapure water

KW - oceal colour algorithms

UR - https://www.osapublishing.org/oe/abstract.cfm

U2 - 10.1364/OE.25.0A1079

DO - 10.1364/OE.25.0A1079

M3 - Article

VL - 25

SP - A1079-A1095

JO - Optics Express

T2 - Optics Express

JF - Optics Express

SN - 1094-4087

IS - 24

ER -