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Technological advancement in tower-based canopy reflectance monitoring: the AMSPEC-III system

Technological advancement in tower-based canopy reflectance monitoring: the AMSPEC-III system
Technological advancement in tower-based canopy reflectance monitoring: the AMSPEC-III system
Understanding plant photosynthesis, or Gross Primary Production (GPP), is a crucial aspect of quantifying the terrestrial carbon cycle. Remote sensing approaches, in particular multi-angular spectroscopy, have proven successful for studying relationships between canopy-reflectance and plant-physiology processes, thus providing a mechanism to scale up. However, many different instrumentation designs exist and few cross-comparisons have been undertaken. This paper discusses the design evolution of the Automated Multiangular SPectro-radiometer for Estimation of Canopy reflectance (AMSPEC) series of instruments. Specifically, we assess the performance of the PP-Systems Unispec-DC and Ocean Optics JAZ-COMBO spectro-radiometers installed on an updated, tower-based AMSPEC-III system. We demonstrate the interoperability of these spectro-radiometers, and the results obtained suggest that JAZ-COMBO can successfully be used to substitute more expensive measurement units for detecting and investigating photosynthesis and canopy spectra. We demonstrate close correlations between JAZ-COMBO and Unispec-DC measured canopy radiance (0.75 ? R2 ? 0.85) and solar irradiance (0.95 ? R2 ? 0.96) over a three month time span. We also demonstrate close agreement between the bi-directional distribution functions obtained from each instrument. We conclude that cost effective alternatives may allow a network of AMSPEC-III systems to simultaneously monitor various vegetation types in different ecosystems. This will allow to scale and improve our understanding of the interactions between vegetation physiology and spectral characteristics, calibrate broad-scale observations to stand-level measurements, and ultimately lead to improved understanding of changing vegetation spectral features from satellite.
PRI, gross primary production, light use efficiency, multi-angle spectroscopy, photosynthesis, remote sensing, spectro-radiometer
1424-8220
32020-32030
Tortini, Riccardo
3eb55617-6ac6-422f-895a-3fa0d3f7f275
Hilker, Thomas
c7fb75b8-320d-49df-84ba-96c9ee523d40
Coops, Nicholas
7adb40ac-2070-40a6-b30a-0357f72fa913
Nesic, Zoran
a1581cdb-fcce-497b-ab4d-41d63e70bca2
Tortini, Riccardo
3eb55617-6ac6-422f-895a-3fa0d3f7f275
Hilker, Thomas
c7fb75b8-320d-49df-84ba-96c9ee523d40
Coops, Nicholas
7adb40ac-2070-40a6-b30a-0357f72fa913
Nesic, Zoran
a1581cdb-fcce-497b-ab4d-41d63e70bca2

Tortini, Riccardo, Hilker, Thomas, Coops, Nicholas and Nesic, Zoran (2015) Technological advancement in tower-based canopy reflectance monitoring: the AMSPEC-III system. Sensors, 15 (12), 32020-32030. (doi:10.3390/s151229906).

Record type: Article

Abstract

Understanding plant photosynthesis, or Gross Primary Production (GPP), is a crucial aspect of quantifying the terrestrial carbon cycle. Remote sensing approaches, in particular multi-angular spectroscopy, have proven successful for studying relationships between canopy-reflectance and plant-physiology processes, thus providing a mechanism to scale up. However, many different instrumentation designs exist and few cross-comparisons have been undertaken. This paper discusses the design evolution of the Automated Multiangular SPectro-radiometer for Estimation of Canopy reflectance (AMSPEC) series of instruments. Specifically, we assess the performance of the PP-Systems Unispec-DC and Ocean Optics JAZ-COMBO spectro-radiometers installed on an updated, tower-based AMSPEC-III system. We demonstrate the interoperability of these spectro-radiometers, and the results obtained suggest that JAZ-COMBO can successfully be used to substitute more expensive measurement units for detecting and investigating photosynthesis and canopy spectra. We demonstrate close correlations between JAZ-COMBO and Unispec-DC measured canopy radiance (0.75 ? R2 ? 0.85) and solar irradiance (0.95 ? R2 ? 0.96) over a three month time span. We also demonstrate close agreement between the bi-directional distribution functions obtained from each instrument. We conclude that cost effective alternatives may allow a network of AMSPEC-III systems to simultaneously monitor various vegetation types in different ecosystems. This will allow to scale and improve our understanding of the interactions between vegetation physiology and spectral characteristics, calibrate broad-scale observations to stand-level measurements, and ultimately lead to improved understanding of changing vegetation spectral features from satellite.

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More information

Accepted/In Press date: 17 December 2015
e-pub ahead of print date: 19 December 2015
Published date: 19 December 2015
Keywords: PRI, gross primary production, light use efficiency, multi-angle spectroscopy, photosynthesis, remote sensing, spectro-radiometer
Organisations: Geography & Environment

Identifiers

Local EPrints ID: 392974
URI: https://eprints.soton.ac.uk/id/eprint/392974
ISSN: 1424-8220
PURE UUID: 33707d41-a0f6-4d7a-ad09-acb2732fd408

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Date deposited: 19 Apr 2016 11:21
Last modified: 06 Jul 2018 16:30

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