Friday, February 26, 2016
And it's coral reefs again!
And what they say is a physical impossibility. Warming will OUTGAS CO2 from the oceans, making them LESS acidic, not more acidic. So what is going on? What they did was conduct an experiment and ARTIFICIALLY make reef water more acidic. And that had adverse effects. But artificial acidification tells us nothing about the probability of natural acidification
Coral reefs are having their growth stunted by ocean acidification caused by global warming, new research has confirmed.
For the first time, scientists conducted an experiment on a natural coral reef which involved altering sea water chemistry to mimic the effect of excess carbon dioxide in the atmosphere.
The results provide strong evidence that ocean acidification linked to greenhouse gas emissions is already slowing coral reef growth, the team claims.
Without "deep cuts" in greenhouse gas emissions, the world's coral reefs may not survive into the next century, scientists say.
Carbon dioxide is absorbed by the ocean where it reacts with seawater to increase acidity.
If the water becomes too acid it dissolves away the calcium carbonate corals that molluscs and creatures such as crabs and lobsters need to build their shells and stony skeletons.
Although previous studies have demonstrated large scale declines in coral reefs in recent decades, the reason for the trend has been harder to pinpoint.
Acidification is one possible cause, but others include warming, pollution and over-fishing.
To investigate the role played by greenhouse gas emissions, the US scientists manipulated the acidity of seawater flowing over a section of the Great Barrier Reef off Australia's One Tree Island.
Bringing the reef's pH value - a measurement of acidity or alkalinity - closer to what it would have been in pre-industrial times increased the rate at which calcium carbonate was deposited to grow hard coral exoskeletons.
Lead researcher Dr Rebecca Albright, from the Carnegie Institution in Washington DC, said: "Our work provides the first strong evidence from experiments on a natural ecosystem that ocean acidification is already slowing coral reef growth.
"Ocean acidification is already taking its toll on coral reef communities. "This is no longer a fear for the future; it is the reality of today."
The research is reported in the latest issue of the journal Nature.
Other work by Carnegie colleague Professor Ken Caldeira found that rates of reef calcification in 2008 and 2009 were 40% lower than they were in 1975 and 1976.
He said: "The only real, lasting way to protect coral reefs is to make deep cuts in our carbon dioxide emissions.
"If we don't take action on this issue very rapidly, coral reefs - and everything that depends on them, including both wildlife and local communities - will not survive into the next century."
Thursday, February 25, 2016
Australia's Barrier Reef at greater risk than thought, study says
Warmist dishonesty never stops. As I have often pointed out before, warmer oceans will OUTGAS CO2 so the result of global warming will be LESS acidic oceans. The only way you can make sense of the reasoning below is to assume that CO2 levels will continue to rise WITHOUT causing any global warming. So that is certainly an interesting admission. There is a popular version of the article below here
The exposure of the Great Barrier Reef to ocean acidification
Mathieu Mongin et al.
The Great Barrier Reef (GBR) is founded on reef-building corals. Corals build their exoskeleton with aragonite, but ocean acidification is lowering the aragonite saturation state of seawater (Ωa). The downscaling of ocean acidification projections from global to GBR scales requires the set of regional drivers controlling Ωa to be resolved. Here we use a regional coupled circulation–biogeochemical model and observations to estimate the Ωa experienced by the 3,581 reefs of the GBR, and to apportion the contributions of the hydrological cycle, regional hydrodynamics and metabolism on Ωa variability. We find more detail, and a greater range (1.43), than previously compiled coarse maps of Ωa of the region (0.4), or in observations (1.0). Most of the variability in Ωa is due to processes upstream of the reef in question. As a result, future decline in Ωa is likely to be steeper on the GBR than currently projected by the IPCC assessment report.
Nature Communications, 7, Article number: 10732. doi:10.1038/ncomms10732
Monday, February 22, 2016
Coral ecosystem adapts to global warming
One of the great shrieks of the Warmists is that warming will destroy coral reefs. There have, however, been plenty of reports showing that not to be so. Latest below
Researchers in New Caledonia have uncovered a new type of coral ecosystem that may already be genetically adapted to global warming conditions.
This has sparked fresh hope for the future survival of coral reefs, after warnings from Pacific Island leaders in recent years about the impact of climate change on these important ecosystems.
French and Australian scientists studied a mangrove area on the west coast of New Caledonia and found corals thriving in warm and acidic waters.
Associate Professor from the University of Technology in Sydney, David Sugget said the new coral ecosystem provides an undiscovered source of genetic diversity.
"What we found in New Caledonia just totally blew us away, we saw almost 30 percent coral cover within the mangrove system, which is absolutely unprecedented," he explained.
"In fact, some reefs worldwide struggle to maintain 30 percent coral cover. Within that coral cover there were at least 20 species."
David Sugget said researchers have been trying for years to figure out how to assist corals adapt to changing climate conditions and mother nature may already have provided the answer.