Parameterization of the chlorophyll a-specific in vivo light absorption coefficient covering estuarine, coastal and oceanic waters

P. A. Stæhr; S. Markager

doi:10.1080/01431160410001716932

Parameterization of the chlorophyll a-specific in vivo light absorption coefficient covering estuarine, coastal and oceanic waters

P. A. Stæhr, S. Markager

Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review

34 Citationer (Scopus)

Abstract

Udgivelsesdato: November 2004

Originalsprog	Engelsk
Tidsskrift	International Journal of Remote Sensing
Vol/bind	25
Udgave nummer	22
Sider (fra-til)	5117-5130
ISSN	0143-1161
DOI	https://doi.org/10.1080/01431160410001716932
Status	Udgivet - 2004

Adgang til dokumentet

10.1080/01431160410001716932

Citationsformater

@article{1b3ac51074c411dbbee902004c4f4f50,

title = "Parameterization of the chlorophyll a-specific in vivo light absorption coefficient covering estuarine, coastal and oceanic waters",

abstract = "We evaluated models predicting the spectral chlorophyll-a (Chl a)-specific absorption coefficient (a*ph (¿)) from Chl a concentration [Chl a] on the basis of 465 phytoplankton absorption spectra collected in estuarine, coastal and oceanic waters. A power model on ln-transformed data provided the best model fit compared to a power model on non-transformed data previously applied to parameterize the relationship between a*ph (¿) and [Chl a]. The variation in a*ph (¿) was parameterized over four orders of magnitude in [Chl a] (0.01-100 mg Chl a m-3) producing a 13-fold range in a*ph (0.19 to 0.015 m2 mg-1 Chl a) at 440 nm, the peak absorption of Chl a in the blue part of the spectrum. The variations in the modelled a*ph spectra were within realistic predictions of a*ph (¿) and the model satisfactorily reproduced the spectral flattening with increasing [Chl a]. The parameterization of a*ph (¿) confirmed the indirect dependency of a*ph (¿) on [Chl a] through co-variations between [Chl a] with pigment packaging and pigment composition. Although pigment packaging determined the spectral flattening, analysis of absorption ratios revealed a systematic change in pigment composition with profound influence on the variability of a*ph in the 440 to 495 nm region. Modelled spectra deviated by approximately 20% from the measured spectra on average and model accuracy was independent of [Chl a]. Although the model cannot fully replace spectral measurements of phytoplankton absorption, it does permit realistic reconstructions of a*ph (¿) from simple measurements of [Chl a] sampled in estuarine, coastal and oceanic waters.",

author = "St{\ae}hr, {P. A.} and S. Markager",

year = "2004",

doi = "10.1080/01431160410001716932",

language = "English",

volume = "25",

pages = "5117--5130",

journal = "International Journal of Remote Sensing",

issn = "0143-1161",

publisher = "Taylor & Francis",

number = "22",

}

TY - JOUR

T1 - Parameterization of the chlorophyll a-specific in vivo light absorption coefficient covering estuarine, coastal and oceanic waters

AU - Stæhr, P. A.

AU - Markager, S.

PY - 2004

Y1 - 2004

N2 - We evaluated models predicting the spectral chlorophyll-a (Chl a)-specific absorption coefficient (a*ph (¿)) from Chl a concentration [Chl a] on the basis of 465 phytoplankton absorption spectra collected in estuarine, coastal and oceanic waters. A power model on ln-transformed data provided the best model fit compared to a power model on non-transformed data previously applied to parameterize the relationship between a*ph (¿) and [Chl a]. The variation in a*ph (¿) was parameterized over four orders of magnitude in [Chl a] (0.01-100 mg Chl a m-3) producing a 13-fold range in a*ph (0.19 to 0.015 m2 mg-1 Chl a) at 440 nm, the peak absorption of Chl a in the blue part of the spectrum. The variations in the modelled a*ph spectra were within realistic predictions of a*ph (¿) and the model satisfactorily reproduced the spectral flattening with increasing [Chl a]. The parameterization of a*ph (¿) confirmed the indirect dependency of a*ph (¿) on [Chl a] through co-variations between [Chl a] with pigment packaging and pigment composition. Although pigment packaging determined the spectral flattening, analysis of absorption ratios revealed a systematic change in pigment composition with profound influence on the variability of a*ph in the 440 to 495 nm region. Modelled spectra deviated by approximately 20% from the measured spectra on average and model accuracy was independent of [Chl a]. Although the model cannot fully replace spectral measurements of phytoplankton absorption, it does permit realistic reconstructions of a*ph (¿) from simple measurements of [Chl a] sampled in estuarine, coastal and oceanic waters.

AB - We evaluated models predicting the spectral chlorophyll-a (Chl a)-specific absorption coefficient (a*ph (¿)) from Chl a concentration [Chl a] on the basis of 465 phytoplankton absorption spectra collected in estuarine, coastal and oceanic waters. A power model on ln-transformed data provided the best model fit compared to a power model on non-transformed data previously applied to parameterize the relationship between a*ph (¿) and [Chl a]. The variation in a*ph (¿) was parameterized over four orders of magnitude in [Chl a] (0.01-100 mg Chl a m-3) producing a 13-fold range in a*ph (0.19 to 0.015 m2 mg-1 Chl a) at 440 nm, the peak absorption of Chl a in the blue part of the spectrum. The variations in the modelled a*ph spectra were within realistic predictions of a*ph (¿) and the model satisfactorily reproduced the spectral flattening with increasing [Chl a]. The parameterization of a*ph (¿) confirmed the indirect dependency of a*ph (¿) on [Chl a] through co-variations between [Chl a] with pigment packaging and pigment composition. Although pigment packaging determined the spectral flattening, analysis of absorption ratios revealed a systematic change in pigment composition with profound influence on the variability of a*ph in the 440 to 495 nm region. Modelled spectra deviated by approximately 20% from the measured spectra on average and model accuracy was independent of [Chl a]. Although the model cannot fully replace spectral measurements of phytoplankton absorption, it does permit realistic reconstructions of a*ph (¿) from simple measurements of [Chl a] sampled in estuarine, coastal and oceanic waters.

U2 - 10.1080/01431160410001716932

DO - 10.1080/01431160410001716932

M3 - Journal article

VL - 25

SP - 5117

EP - 5130

JO - International Journal of Remote Sensing

JF - International Journal of Remote Sensing

SN - 0143-1161

IS - 22

ER -