Potential impacts of nonalgal materials on water-leaving sun induced chlorophyll fluorescence signals in coastal waters

David McKee, Alex Cunningham, David Wright, Lorraine Hay

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

It has been suggested that Sun induced chlorophyll fluorescence (SICF) signals could be used to estimate phytoplankton chlorophyll concentration and to investigate algal physiology from space. However, water-leaving SICF is also a product of the ambient light field. In coastal waters both algal and nonalgal materials affect the underwater light field. In this study we examine the independent impacts of varying loads of mineral suspended solids (MSS) and colored dissolved organic materials (CDOM) on water-leaving SICF signals using Hydrolight radiative transfer simulations. We show that SICF signals in coastal waters are strongly influenced by nonalgal materials. Increasing concentrations of CDOM and minerals can reduce the water-leaving SICF per unit chlorophyll by over 50% for the concentration ranges explored here (CDOM = 0 to 1 m−1 at 440 nm, MSS=0 to 10 g m−3). The moderate-resolution imaging spectroradiometer (MODIS) fluorescence line height algorithm is shown to be relatively unaffected by increasing CDOM, but performance is significantly degraded by mineral concentrations greater than 5 g m−3 owing to increased background radiance levels. The combination of these two effects means that caution is required for the interpretation of SICF signals from coastal waters.
LanguageEnglish
Pages7720-7729
Number of pages10
JournalApplied Optics
Volume46
Issue number31
DOIs
Publication statusPublished - 2007

Fingerprint

coastal water
chlorophylls
sun
fluorescence
organic materials
water
minerals
phytoplankton
physiology
MODIS (radiometry)
radiance
radiative transfer
estimates
products

Keywords

  • nonalgal material
  • sun induced chlorophyll fluorescence signals
  • coastal waters

Cite this

McKee, David ; Cunningham, Alex ; Wright, David ; Hay, Lorraine. / Potential impacts of nonalgal materials on water-leaving sun induced chlorophyll fluorescence signals in coastal waters. In: Applied Optics. 2007 ; Vol. 46, No. 31. pp. 7720-7729.
@article{cdf76da53c1b4cf7aeaa1212a47176ed,
title = "Potential impacts of nonalgal materials on water-leaving sun induced chlorophyll fluorescence signals in coastal waters",
abstract = "It has been suggested that Sun induced chlorophyll fluorescence (SICF) signals could be used to estimate phytoplankton chlorophyll concentration and to investigate algal physiology from space. However, water-leaving SICF is also a product of the ambient light field. In coastal waters both algal and nonalgal materials affect the underwater light field. In this study we examine the independent impacts of varying loads of mineral suspended solids (MSS) and colored dissolved organic materials (CDOM) on water-leaving SICF signals using Hydrolight radiative transfer simulations. We show that SICF signals in coastal waters are strongly influenced by nonalgal materials. Increasing concentrations of CDOM and minerals can reduce the water-leaving SICF per unit chlorophyll by over 50{\%} for the concentration ranges explored here (CDOM = 0 to 1 m−1 at 440 nm, MSS=0 to 10 g m−3). The moderate-resolution imaging spectroradiometer (MODIS) fluorescence line height algorithm is shown to be relatively unaffected by increasing CDOM, but performance is significantly degraded by mineral concentrations greater than 5 g m−3 owing to increased background radiance levels. The combination of these two effects means that caution is required for the interpretation of SICF signals from coastal waters.",
keywords = "nonalgal material, sun induced chlorophyll fluorescence signals, coastal waters",
author = "David McKee and Alex Cunningham and David Wright and Lorraine Hay",
year = "2007",
doi = "10.1364/AO.46.007720",
language = "English",
volume = "46",
pages = "7720--7729",
journal = "Applied Optics",
issn = "1559-128X",
publisher = "Optical Society of America",
number = "31",

}

Potential impacts of nonalgal materials on water-leaving sun induced chlorophyll fluorescence signals in coastal waters. / McKee, David; Cunningham, Alex; Wright, David; Hay, Lorraine.

In: Applied Optics, Vol. 46, No. 31, 2007, p. 7720-7729.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Potential impacts of nonalgal materials on water-leaving sun induced chlorophyll fluorescence signals in coastal waters

AU - McKee, David

AU - Cunningham, Alex

AU - Wright, David

AU - Hay, Lorraine

PY - 2007

Y1 - 2007

N2 - It has been suggested that Sun induced chlorophyll fluorescence (SICF) signals could be used to estimate phytoplankton chlorophyll concentration and to investigate algal physiology from space. However, water-leaving SICF is also a product of the ambient light field. In coastal waters both algal and nonalgal materials affect the underwater light field. In this study we examine the independent impacts of varying loads of mineral suspended solids (MSS) and colored dissolved organic materials (CDOM) on water-leaving SICF signals using Hydrolight radiative transfer simulations. We show that SICF signals in coastal waters are strongly influenced by nonalgal materials. Increasing concentrations of CDOM and minerals can reduce the water-leaving SICF per unit chlorophyll by over 50% for the concentration ranges explored here (CDOM = 0 to 1 m−1 at 440 nm, MSS=0 to 10 g m−3). The moderate-resolution imaging spectroradiometer (MODIS) fluorescence line height algorithm is shown to be relatively unaffected by increasing CDOM, but performance is significantly degraded by mineral concentrations greater than 5 g m−3 owing to increased background radiance levels. The combination of these two effects means that caution is required for the interpretation of SICF signals from coastal waters.

AB - It has been suggested that Sun induced chlorophyll fluorescence (SICF) signals could be used to estimate phytoplankton chlorophyll concentration and to investigate algal physiology from space. However, water-leaving SICF is also a product of the ambient light field. In coastal waters both algal and nonalgal materials affect the underwater light field. In this study we examine the independent impacts of varying loads of mineral suspended solids (MSS) and colored dissolved organic materials (CDOM) on water-leaving SICF signals using Hydrolight radiative transfer simulations. We show that SICF signals in coastal waters are strongly influenced by nonalgal materials. Increasing concentrations of CDOM and minerals can reduce the water-leaving SICF per unit chlorophyll by over 50% for the concentration ranges explored here (CDOM = 0 to 1 m−1 at 440 nm, MSS=0 to 10 g m−3). The moderate-resolution imaging spectroradiometer (MODIS) fluorescence line height algorithm is shown to be relatively unaffected by increasing CDOM, but performance is significantly degraded by mineral concentrations greater than 5 g m−3 owing to increased background radiance levels. The combination of these two effects means that caution is required for the interpretation of SICF signals from coastal waters.

KW - nonalgal material

KW - sun induced chlorophyll fluorescence signals

KW - coastal waters

U2 - 10.1364/AO.46.007720

DO - 10.1364/AO.46.007720

M3 - Article

VL - 46

SP - 7720

EP - 7729

JO - Applied Optics

T2 - Applied Optics

JF - Applied Optics

SN - 1559-128X

IS - 31

ER -