Widespread reduction in sun-induced fluorescence from the Amazon during the 2015/2016 El Niño

Gerbrand Koren, Erik van Schaik, Alessandro C. Araújo, K.F. Boersma, Antje Gärtner, Lars Killaars, Maurits L. Kooreman, Bart Kruijt, Ingrid T. van der Laan-Luijkx, Celso von Randow, Naomi E. Smith, Wouter Peters

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Abstract

The tropical carbon balance dominates year-to-year variations in the CO2 exchange with the atmosphere through photosynthesis, respiration and fires. Because of its high correlation with gross primary productivity (GPP), observations of sun-induced fluorescence (SIF) are of great interest. We developed a new remotely sensed SIF product with improved signal-to-noise in the tropics, and use it here to quantify the impact of the 2015/2016 El Niño Amazon drought. We find that SIF was strongly suppressed over areas with anomalously high temperatures and decreased levels of water in the soil. SIF went below its climatological range starting from the end of the 2015 dry season (October) and returned to normal levels by February 2016 when atmospheric conditions returned to normal, but well before the end of anomalously low precipitation that persisted through June 2016. Impacts were not uniform across the Amazon basin, with the eastern part experiencing much larger (10-15%) SIF reductions than the western part of the basin (2-5%). We estimate the integrated loss of GPP relative to eight previous years to be 0.34-0.48 PgC in the three-month period October-November-December 2015.This article is part of a discussion meeting issue 'The impact of the 2015/2016 El Niño on the terrestrial tropical carbon cycle: patterns, mechanisms and implications'.

Original languageEnglish
Article number20170408
Number of pages10
JournalPhilosophical Transactions of the Royal Society B. Biological sciences
Volume373
Issue number1760
DOIs
Publication statusPublished - 8 Oct 2018

Fingerprint

Solar System
Sun
Fluorescence
fluorescence
primary productivity
Carbon
Productivity
basins
Carbon Cycle
Tropics
Photosynthesis
Drought
Droughts
Atmosphere
Noise
dry season
tropics
Respiration
Fires
Soil

Keywords

  • Amazon rainforest
  • drought response
  • El Niño-Southern Oscillation
  • gross primary production
  • sun-induced fluorescence
  • tropical terrestrial carbon cycle

Cite this

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title = "Widespread reduction in sun-induced fluorescence from the Amazon during the 2015/2016 El Ni{\~n}o",
abstract = "The tropical carbon balance dominates year-to-year variations in the CO2 exchange with the atmosphere through photosynthesis, respiration and fires. Because of its high correlation with gross primary productivity (GPP), observations of sun-induced fluorescence (SIF) are of great interest. We developed a new remotely sensed SIF product with improved signal-to-noise in the tropics, and use it here to quantify the impact of the 2015/2016 El Ni{\~n}o Amazon drought. We find that SIF was strongly suppressed over areas with anomalously high temperatures and decreased levels of water in the soil. SIF went below its climatological range starting from the end of the 2015 dry season (October) and returned to normal levels by February 2016 when atmospheric conditions returned to normal, but well before the end of anomalously low precipitation that persisted through June 2016. Impacts were not uniform across the Amazon basin, with the eastern part experiencing much larger (10-15{\%}) SIF reductions than the western part of the basin (2-5{\%}). We estimate the integrated loss of GPP relative to eight previous years to be 0.34-0.48 PgC in the three-month period October-November-December 2015.This article is part of a discussion meeting issue 'The impact of the 2015/2016 El Ni{\~n}o on the terrestrial tropical carbon cycle: patterns, mechanisms and implications'.",
keywords = "Amazon rainforest, drought response, El Ni{\~n}o-Southern Oscillation, gross primary production, sun-induced fluorescence, tropical terrestrial carbon cycle",
author = "Gerbrand Koren and {van Schaik}, Erik and Ara{\'u}jo, {Alessandro C.} and K.F. Boersma and Antje G{\"a}rtner and Lars Killaars and Kooreman, {Maurits L.} and Bart Kruijt and {van der Laan-Luijkx}, {Ingrid T.} and {von Randow}, Celso and Smith, {Naomi E.} and Wouter Peters",
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journal = "Philosophical Transactions of the Royal Society B. Biological sciences",
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Widespread reduction in sun-induced fluorescence from the Amazon during the 2015/2016 El Niño. / Koren, Gerbrand; van Schaik, Erik; Araújo, Alessandro C.; Boersma, K.F.; Gärtner, Antje; Killaars, Lars; Kooreman, Maurits L.; Kruijt, Bart; van der Laan-Luijkx, Ingrid T.; von Randow, Celso; Smith, Naomi E.; Peters, Wouter.

In: Philosophical Transactions of the Royal Society B. Biological sciences, Vol. 373, No. 1760, 20170408, 08.10.2018.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Widespread reduction in sun-induced fluorescence from the Amazon during the 2015/2016 El Niño

AU - Koren, Gerbrand

AU - van Schaik, Erik

AU - Araújo, Alessandro C.

AU - Boersma, K.F.

AU - Gärtner, Antje

AU - Killaars, Lars

AU - Kooreman, Maurits L.

AU - Kruijt, Bart

AU - van der Laan-Luijkx, Ingrid T.

AU - von Randow, Celso

AU - Smith, Naomi E.

AU - Peters, Wouter

PY - 2018/10/8

Y1 - 2018/10/8

N2 - The tropical carbon balance dominates year-to-year variations in the CO2 exchange with the atmosphere through photosynthesis, respiration and fires. Because of its high correlation with gross primary productivity (GPP), observations of sun-induced fluorescence (SIF) are of great interest. We developed a new remotely sensed SIF product with improved signal-to-noise in the tropics, and use it here to quantify the impact of the 2015/2016 El Niño Amazon drought. We find that SIF was strongly suppressed over areas with anomalously high temperatures and decreased levels of water in the soil. SIF went below its climatological range starting from the end of the 2015 dry season (October) and returned to normal levels by February 2016 when atmospheric conditions returned to normal, but well before the end of anomalously low precipitation that persisted through June 2016. Impacts were not uniform across the Amazon basin, with the eastern part experiencing much larger (10-15%) SIF reductions than the western part of the basin (2-5%). We estimate the integrated loss of GPP relative to eight previous years to be 0.34-0.48 PgC in the three-month period October-November-December 2015.This article is part of a discussion meeting issue 'The impact of the 2015/2016 El Niño on the terrestrial tropical carbon cycle: patterns, mechanisms and implications'.

AB - The tropical carbon balance dominates year-to-year variations in the CO2 exchange with the atmosphere through photosynthesis, respiration and fires. Because of its high correlation with gross primary productivity (GPP), observations of sun-induced fluorescence (SIF) are of great interest. We developed a new remotely sensed SIF product with improved signal-to-noise in the tropics, and use it here to quantify the impact of the 2015/2016 El Niño Amazon drought. We find that SIF was strongly suppressed over areas with anomalously high temperatures and decreased levels of water in the soil. SIF went below its climatological range starting from the end of the 2015 dry season (October) and returned to normal levels by February 2016 when atmospheric conditions returned to normal, but well before the end of anomalously low precipitation that persisted through June 2016. Impacts were not uniform across the Amazon basin, with the eastern part experiencing much larger (10-15%) SIF reductions than the western part of the basin (2-5%). We estimate the integrated loss of GPP relative to eight previous years to be 0.34-0.48 PgC in the three-month period October-November-December 2015.This article is part of a discussion meeting issue 'The impact of the 2015/2016 El Niño on the terrestrial tropical carbon cycle: patterns, mechanisms and implications'.

KW - Amazon rainforest

KW - drought response

KW - El Niño-Southern Oscillation

KW - gross primary production

KW - sun-induced fluorescence

KW - tropical terrestrial carbon cycle

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DO - 10.1098/rstb.2017.0408

M3 - Article

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JO - Philosophical Transactions of the Royal Society B. Biological sciences

JF - Philosophical Transactions of the Royal Society B. Biological sciences

SN - 0962-8436

IS - 1760

M1 - 20170408

ER -