Macroalgal calcification and the effects of ocean acidification and global warming

2021 ◽  
Author(s):  
Fangfang Yang ◽  
Zhangliang Wei ◽  
Lijuan Long
Keyword(s):  
Global Warming ◽  
Ocean Acidification

scholarly journals Simulated Variation Characteristics of Oceanic CO2 Uptake, Surface Temperature, and Acidification in Zhejiang Province, China

2021 ◽  
Vol 9 ◽  
Author(s):  
Kuo Wang ◽  
Han Zhang ◽  
Gao-Feng Fan ◽  
Zheng-Quan Li ◽  
Zhen-Yan Yu ◽  
...  
Keyword(s):  
Global Warming ◽  
Carbon Sequestration ◽  
Carbon Cycle ◽  
Surface Temperature ◽  
Ocean Acidification ◽  
Sea Surface ◽  
Co2 Uptake ◽  
Hydrogen Ion Concentration ◽  
Variation Characteristics ◽  
Oceanic Carbon

Since preindustrial times, atmospheric CO2 content increased continuously, leading to global warming through the greenhouse effect. Oceanic carbon sequestration mitigates global warming; on the other hand, oceanic CO2 uptake would reduce seawater pH, which is termed ocean acidification. We perform Earth system model simulations to assess oceanic CO2 uptake, surface temperature, and acidification for Zhejiang offshore, one of the most vulnerable areas to marine disasters. In the last 40 years, atmospheric CO2 concentration increased by 71 ppm, and sea surface temperature (SST) in Zhejiang offshore increased at a rate of 0.16°C/10a. Cumulative oceanic CO2 uptake in Zhejiang offshore is 0.3 Pg C, resulting in an increase of 20% in sea surface hydrogen ion concentration, and the acidification rate becomes faster in the last decade. During 2020–2040, under four RCP scenarios, SST in Zhejiang offshore increases by 0.3–0.5°C, whereas cumulative ocean carbon sequestration is 0.150–0.165 Pg C. Relative to RCP2.6, the decrease of surface pH in Zhejiang offshore is doubled under RCP8.5. Furthermore, simulated results show that the relationship between CO2 scenario and oceanic carbon cycle is nonlinear, which hints that deeper reduction of anthropogenic CO2 emission may be needed if we aim to mitigate ocean acidification in Zhejiang offshore under a higher CO2 concentration scenario. Our study quantifies the variation characteristics of oceanic climate and carbon cycle fields in Zhejiang offshore, and provides new insight into the responses of oceanic carbon cycle and the climate system to oceanic carbon sequestration.

Global warming offsets the ecophysiological stress of ocean acidification on temperate crustose coralline algae

2020 ◽  
Vol 157 ◽  
pp. 111324 ◽  
Author(s):  
Ju-Hyoung Kim ◽  
Nahyun Kim ◽  
Hanbi Moon ◽  
Sukyeon Lee ◽  
So Young Jeong ◽  
...  
Keyword(s):  
Global Warming ◽  
Ocean Acidification ◽  
Coralline Algae ◽  
Crustose Coralline Algae

scholarly journals Physiological Challenges to Fishes in a Warmer and Acidified Future

Physiology ◽  
2016 ◽  
Vol 31 (6) ◽  
pp. 409-417 ◽  
Author(s):  
Göran E. Nilsson ◽  
Sjannie Lefevre
Keyword(s):  
Global Warming ◽  
Body Temperature ◽  
Ocean Acidification ◽  
Behavioral Changes ◽  
Regulatory Mechanisms ◽  
Metabolic Rates ◽  
Ion Gradients ◽  
The Many

With the projected levels of global warming and ocean acidification, fishes have to face warmer waters with CO2 levels that are the highest in over 30 million years. The resultant rise in body temperature means that metabolic rates of fish will increase, and some may become energetically compromised. No less worrying, and maybe more surprising, is that rising CO2 concentrations appear to trigger pH regulatory mechanisms that disrupts neural ion gradients, leading to altered neurotransmitter function and maladaptive behavioral changes. We point out the many outstanding questions, including the ultimate one: Will fish be able to adapt to these challenges?

scholarly journals Quantifying the impact of ocean acidification on our future climate

2014 ◽  
Vol 11 (14) ◽  
pp. 3965-3983 ◽  
Author(s):  
R. J. Matear ◽  
A. Lenton
Keyword(s):  
Climate Change ◽  
Global Warming ◽  
Ocean Acidification ◽  
Observational Studies ◽  
Emission Scenario ◽  
Biogeochemical Cycles ◽  
Future Climate ◽  
Atmospheric Co2 ◽  
First Order ◽  
The Impact

Abstract. Ocean acidification (OA) is the consequence of rising atmospheric CO2 levels, and it is occurring in conjunction with global warming. Observational studies show that OA will impact ocean biogeochemical cycles. Here, we use an Earth system model under the RCP8.5 emission scenario to evaluate and quantify the first-order impacts of OA on marine biogeochemical cycles, and its potential feedback on our future climate. We find that OA impacts have only a small impact on the future atmospheric CO2 (less than 45 ppm) and global warming (less than a 0.25 K) by 2100. While the climate change feedbacks are small, OA impacts may significantly alter the distribution of biological production and remineralisation, which would alter the dissolved oxygen distribution in the ocean interior. Our results demonstrate that the consequences of OA will not be through its impact on climate change, but on how it impacts the flow of energy in marine ecosystems, which may significantly impact their productivity, composition and diversity.

Global warming amplified by reduced sulphur fluxes as a result of ocean acidification

2013 ◽  
Vol 3 (11) ◽  
pp. 975-978 ◽  
Author(s):  
Katharina D. Six ◽  
Silvia Kloster ◽  
Tatiana Ilyina ◽  
Stephen D. Archer ◽  
Kai Zhang ◽  
...  
Keyword(s):  
Global Warming ◽  
Ocean Acidification
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