Global retrieval of marine and terrestrial chlorophyll fluorescence at its red peak using hyperspectral top of atmosphere radiance measurements: Feasibility study and first results

Wolanin, Aleksandra; Розанов, В. В.; Dinter, Tilman; Noël, Stefan; Vountas, Marco; Burrows, J. P.; Bracher, Astrid

doi:10.1016/j.rse.2015.05.018

Cited by 56 publications

(25 citation statements)

References 109 publications

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“…Specifically, the data from the atmospheric mission SCIAMACHY (Scanning Imaging Absorption Spectrometer for Atmospheric Chartography) [11,12] have been used to retrieve PFTs [13,14], light availability [15] and chlorophyll a(chl-a) fluorescence [16]. However, these data of high spectral resolution (0.26-0.44 nm in the UV-visible range) had also a large pixel size (∼30 km by 60 km).…”

Section: Introductionmentioning

confidence: 99%

Investigation of Spectral Band Requirements for Improving Retrievals of Phytoplankton Functional Types

2016

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Abstract:Studying phytoplankton functional types (PFTs) from space is possible due to recent advances in remote sensing. Though a variety of products are available, the limited number of wavelengths available compared to the number of model parameters needed to be retrieved is still a major problem in using ocean-color data for PFT retrievals. Here, we investigated which band placement could improve retrievals of three particular PFTs (diatoms, coccolithophores and cyanobacteria). In addition to analyzing dominant spectral features in the absorption spectra of the target PFTs, two previously-developed methods using measured spectra were applied to simulated data. Such a synthetic dataset allowed for significantly increasing the number of scenarios and enabled a full control over parameters causing spectral changes. We evaluated the chosen band placement by applying an adapted ocean reflectance inversion, as utilized in the generalized inherent optical properties (GIOP) retrieval. Results show that the optimal band settings depend on the method applied to determine the bands placement, as well as on the internal variability of the dataset investigated. Therefore, continuous hyperspectral instruments would be most beneficial for discriminating multiple PFTs, though a small improvement in spectral sampling and resolution does not significantly modify the results. Bands, which could be added to future instruments (e.g., Ocean and Land Colour Instrument (OLCI) instrument on the upcoming Sentinel-3B,-3C,-3D, etc., and further satellites) in order to enhance PFT retrieval capabilities, were also determined.

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Section: Introductionmentioning

confidence: 99%

Investigation of Spectral Band Requirements for Improving Retrievals of Phytoplankton Functional Types

2016

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“…Chlorophyll fluorescence is also used to assess the physiological state of phytoplankton (Falkowski and Kolber, 1995) and also in this field significant advances have been made recently (see for example Wolanin et al, 2015). However, within this study we confine ourselves to terrestrial plant fluorescence and focus on the presentation of:…”

Section: Introductionmentioning

confidence: 99%

Retrieval of Terrestrial Plant Fluorescence Based on the In-Filling of Far-Red Fraunhofer Lines Using SCIAMACHY Observations

Khosravi

Vountas

Розанов

et al. 2015

Front. Environ. Sci.

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Chlorophyll fluorescence is directly linked to the photosynthetic efficiency of plants. As satellite-based remote sensing has been shown to have the potential to derive global information about fluorescence it has become subject of various recently published studies stimulating an upsurge in this research field. This manuscript presents a simple and fast retrieval method for solar induced terrestrial plant fluorescence (SIF) which relies on only a few prerequisites. The spaced based remote sensing spectrometers used in this work typically exhibit an additive spectral feature, which is not fluorescence. This is often accompanying the actual SIF retrieval and can significantly deteriorate the results. To account for this effect a correction method has been developed and is combined with the retrieval. The method has been applied to 10 years of SCIAMACHY data with promising results. The retrieved SIF values are lying between 0 and 4 mW [m −2 sr −1 nm −1 ]. However, most of the retrieved values are not exceeding 1.5 [m −2 sr −1 nm −1 ], agreeing with previous studies on the subject. Results have been retrieved for SCIAMACHY spatial resolution of 240 30 km 2 × and gridded to 80 arc minutes. A clear seasonal variation could be shown utilizing 10 years of SCIAMACHY data (2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012). In absence of large area ground based validation data a final judgment of the results presented is not feasible. However, a direct comparison to data of others was showing similar results for most areas.

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“…Terrestrial remote sensing observations can detect the faint fluorescent signal caused by surface vegetation (Joiner et al, 2011;Wolanin et al, 2015), as illustrated in Fig. 1.…”

Section: 1 Prospects For Detectablitymentioning

confidence: 99%

“…A wide range of organisms contain biomolecules that fluoresce, such as chlorophyll in vegetation, green fluorescent proteins (GFPs) and GFP-like proteins in a variety of marine life, or fluorescent compounds/pigments in some land animals, such as insects and amphibians (Holovachov, 2015;Middleton et al, 2015;Sparks et al, 2014;Taboada et al 2017). On Earth, fluorescence in vegetation produces a planetwide effect (shown in Fig.1) that can be detected from orbit (Joiner et al, 2011;Wolanin et al, 2015). Biofluorescence therefore presents previously unexplored possibilities for global spectral biosignatures on extrasolar worlds.…”

Section: Introductionmentioning

confidence: 99%

Biofluorescent worlds: global biological fluorescence as a biosignature

O’Malley-James

Kaltenegger

2018

Monthly Notices of the Royal Astronomical Society

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In this paper, we analyze a new possible biological surface feature for habitable worlds orbiting other stars: biofluorescence. High ultraviolet (UV) and blue radiation fluxes drive the strongest biofluorescence in terrestrial fluorescent pigments and proteins. F stars emit more blue and UV radiation than the Sun, while planets and exomoons orbiting such stars remain in the habitable zone for 2-4 Gyr; a timespan that could allow a complex biosphere to develop. Therefore we propose biofluorescence as a new surface biosignature for F star planets. We investigate how the extra emission from surface fluorescence could cause observable signals at specific wavelengths in the visible spectrum. Using the absorption and emission characteristics of common coral fluorescent pigments and proteins, we simulate the increased emission at specific visible wavelengths caused by strong fluorescence, accounting for the effects of different (non-fluorescent) surface features, atmospheric absorption and cloud-cover. Our model shows that exoplanets with a fluorescent biosphere could have characteristic surface colours that allow the presence of surface life to be inferred from observations with upcoming telescopes.

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Global retrieval of marine and terrestrial chlorophyll fluorescence at its red peak using hyperspectral top of atmosphere radiance measurements: Feasibility study and first results

Cited by 56 publications

References 109 publications

Investigation of Spectral Band Requirements for Improving Retrievals of Phytoplankton Functional Types

Investigation of Spectral Band Requirements for Improving Retrievals of Phytoplankton Functional Types

Retrieval of Terrestrial Plant Fluorescence Based on the In-Filling of Far-Red Fraunhofer Lines Using SCIAMACHY Observations

Biofluorescent worlds: global biological fluorescence as a biosignature

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