Anthropogenic ocean warming and acidification recorded by Sr/Ca, Li/Mg, δ 11 B and B/Ca in Porites coral from the Kimberley region of northwestern Australia

Xuefei Chen, Juan Pablo D'Olivo, Gangjian Wei, Malcolm McCulloch

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Abstract

The impact of climate changes on corals living in naturally extreme environments is poorly understood but crucial to longer-term sustainability of coral reefs. Here we report century-long temperature (Sr/Ca and Li/Mg)and calcifying fluid (CF)carbonate chemistry (δ 11 B and B/Ca)records for a long-lived (1919 to 2016)Porites coral from the high thermally variable Kimberley region of northwestern Australia. We investigate how increasing temperatures and ocean acidification are manifested in the carbonate chemistry of coral's CF and impacts of climate change on calcification. Using Sr/Ca and Li/Mg multiproxy we show that annual temperature in the nearshore Kimberley exhibited a gradual increase (0.009 ± 0.003 °C/yr)from the 1920s onward. However for the most recent years (2000–2015)more rapid summer warming (0.05 ± 0.01 °C/yr)are registered, indicative of intensified warming. Despite that, we find no significant trend for calcification rate of this coral over the past century, as well as ‘normal’ seasonal variability in coral's CF carbonate chemistry. Importantly, the coral's ability to concentrate inorganic carbon seems to be affected by recent warming, with reduced DIC cf observed during 2008 to 2015, while the minimally-affected pH cf acts to compensate the decreases of DIC cf with the calcification rate showing only slight decrease. Additionally, we also find that ocean acidification has clearly led to the long-term reduction in the pH of the CF.

Original languageEnglish
Pages (from-to)50-59
Number of pages10
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume528
DOIs
Publication statusPublished - 15 Aug 2019

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acidification
corals
coral
warming
oceans
calcification
ocean
carbonates
chemistry
fluid
carbonate
climate change
temperature
inorganic carbon
coral reefs
coral reef
concentrates
seasonal variation
sustainability
fluids

Cite this

@article{355eaa4042ae4cfa8cd3528c7ed7deea,
title = "Anthropogenic ocean warming and acidification recorded by Sr/Ca, Li/Mg, δ 11 B and B/Ca in Porites coral from the Kimberley region of northwestern Australia",
abstract = "The impact of climate changes on corals living in naturally extreme environments is poorly understood but crucial to longer-term sustainability of coral reefs. Here we report century-long temperature (Sr/Ca and Li/Mg)and calcifying fluid (CF)carbonate chemistry (δ 11 B and B/Ca)records for a long-lived (1919 to 2016)Porites coral from the high thermally variable Kimberley region of northwestern Australia. We investigate how increasing temperatures and ocean acidification are manifested in the carbonate chemistry of coral's CF and impacts of climate change on calcification. Using Sr/Ca and Li/Mg multiproxy we show that annual temperature in the nearshore Kimberley exhibited a gradual increase (0.009 ± 0.003 °C/yr)from the 1920s onward. However for the most recent years (2000–2015)more rapid summer warming (0.05 ± 0.01 °C/yr)are registered, indicative of intensified warming. Despite that, we find no significant trend for calcification rate of this coral over the past century, as well as ‘normal’ seasonal variability in coral's CF carbonate chemistry. Importantly, the coral's ability to concentrate inorganic carbon seems to be affected by recent warming, with reduced DIC cf observed during 2008 to 2015, while the minimally-affected pH cf acts to compensate the decreases of DIC cf with the calcification rate showing only slight decrease. Additionally, we also find that ocean acidification has clearly led to the long-term reduction in the pH of the CF.",
keywords = "Boron isotopes, Calcifying fluid, Carbonate chemistry, Coral calcification",
author = "Xuefei Chen and D'Olivo, {Juan Pablo} and Gangjian Wei and Malcolm McCulloch",
year = "2019",
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doi = "10.1016/j.palaeo.2019.04.033",
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journal = "Palaeogeography Palaeoclimatology Palaeoecology",
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TY - JOUR

T1 - Anthropogenic ocean warming and acidification recorded by Sr/Ca, Li/Mg, δ 11 B and B/Ca in Porites coral from the Kimberley region of northwestern Australia

AU - Chen, Xuefei

AU - D'Olivo, Juan Pablo

AU - Wei, Gangjian

AU - McCulloch, Malcolm

PY - 2019/8/15

Y1 - 2019/8/15

N2 - The impact of climate changes on corals living in naturally extreme environments is poorly understood but crucial to longer-term sustainability of coral reefs. Here we report century-long temperature (Sr/Ca and Li/Mg)and calcifying fluid (CF)carbonate chemistry (δ 11 B and B/Ca)records for a long-lived (1919 to 2016)Porites coral from the high thermally variable Kimberley region of northwestern Australia. We investigate how increasing temperatures and ocean acidification are manifested in the carbonate chemistry of coral's CF and impacts of climate change on calcification. Using Sr/Ca and Li/Mg multiproxy we show that annual temperature in the nearshore Kimberley exhibited a gradual increase (0.009 ± 0.003 °C/yr)from the 1920s onward. However for the most recent years (2000–2015)more rapid summer warming (0.05 ± 0.01 °C/yr)are registered, indicative of intensified warming. Despite that, we find no significant trend for calcification rate of this coral over the past century, as well as ‘normal’ seasonal variability in coral's CF carbonate chemistry. Importantly, the coral's ability to concentrate inorganic carbon seems to be affected by recent warming, with reduced DIC cf observed during 2008 to 2015, while the minimally-affected pH cf acts to compensate the decreases of DIC cf with the calcification rate showing only slight decrease. Additionally, we also find that ocean acidification has clearly led to the long-term reduction in the pH of the CF.

AB - The impact of climate changes on corals living in naturally extreme environments is poorly understood but crucial to longer-term sustainability of coral reefs. Here we report century-long temperature (Sr/Ca and Li/Mg)and calcifying fluid (CF)carbonate chemistry (δ 11 B and B/Ca)records for a long-lived (1919 to 2016)Porites coral from the high thermally variable Kimberley region of northwestern Australia. We investigate how increasing temperatures and ocean acidification are manifested in the carbonate chemistry of coral's CF and impacts of climate change on calcification. Using Sr/Ca and Li/Mg multiproxy we show that annual temperature in the nearshore Kimberley exhibited a gradual increase (0.009 ± 0.003 °C/yr)from the 1920s onward. However for the most recent years (2000–2015)more rapid summer warming (0.05 ± 0.01 °C/yr)are registered, indicative of intensified warming. Despite that, we find no significant trend for calcification rate of this coral over the past century, as well as ‘normal’ seasonal variability in coral's CF carbonate chemistry. Importantly, the coral's ability to concentrate inorganic carbon seems to be affected by recent warming, with reduced DIC cf observed during 2008 to 2015, while the minimally-affected pH cf acts to compensate the decreases of DIC cf with the calcification rate showing only slight decrease. Additionally, we also find that ocean acidification has clearly led to the long-term reduction in the pH of the CF.

KW - Boron isotopes

KW - Calcifying fluid

KW - Carbonate chemistry

KW - Coral calcification

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U2 - 10.1016/j.palaeo.2019.04.033

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M3 - Article

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JO - Palaeogeography Palaeoclimatology Palaeoecology

JF - Palaeogeography Palaeoclimatology Palaeoecology

SN - 0031-0182

ER -