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Tuesday, June 18 2019 @ 01:17 AM UTC

Climate change suspended reef growth for 2 millennia

Environmental Issues Climate change drove coral reefs to a total ecosystem collapse lasting thousands of years, according to a paper published this week in Science. The paper shows how natural climatic shifts stopped reef growth in the eastern Pacific for 2,500 years. The reef shutdown, which began 4,000 years ago, corresponds to a period of dramatic swings in the El Niño–Southern Oscillation (ENSO). "As humans continue to pump greenhouse gases into the atmosphere, the climate is once again on the threshold of a new regime, with dire consequences for reef ecosystems unless we get control of climate change," said coauthor Richard Aronson, a biology professor at Florida Institute of Technology.

Doctoral student Lauren Toth and Aronson, her adviser at Florida Tech, led the study of how past episodes of climate change influenced tropical reefs of the eastern Pacific. Toth, Aronson and a multi-institutional research team drove 17-foot, small-bore aluminum pipes deep into the dead frameworks of coral reefs along the Pacific coast of Panama and pulled out cross-sections of the reefs. By analyzing the corals in the cores, they were able to reconstruct the history of the reefs over the past 6,000 years.

"We were shocked to find that 2,500 years of reef growth were missing from the frameworks," said Toth. "That gap represents the collapse of reef ecosystems for 40 percent of their total history." When Toth and Aronson examined reef records from other studies across the Pacific, they discovered the same gap in reefs as far away as Australia and Japan.

Toth linked the coral-reef collapse to changes in ENSO. ENSO is the climate cycle responsible for the weather conditions every few years known as El Niño and La Niña events. The timing of the shutdown in reef growth corresponds to a period of wild swings in ENSO. "Coral reefs are resilient ecosystems," said Toth. "For Pacific reefs to have collapsed for such a long time and over such a large geographic scale, they must have experienced a major climatic disturbance. That disturbance was an intensified ENSO regime."

Scenarios of climate change for the coming century echo the climate patterns that collapsed reefs in the eastern Pacific 4,000 years ago. The reefs off Panama are on the verge of another collapse. "Climate change could again destroy coral-reef ecosystems, but this time the root cause would be the human assault on the environment and the collapse could be longer-lasting," said Aronson. "Local issues like pollution and overfishing are major destructive forces and they need to be stopped, but they are trumped by climate change, which right now is the greatest threat to coral reefs."

Toth noted more hopefully that reefs have proven resilient in the past, so the potential for recovery should be good if climate change can be mitigated or reversed.

Source : Florida Institute of Technology

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Climate change suspended reef growth for 2 millennia | 4 comments | Create New Account
The following comments are owned by whomever posted them. This site is not responsible for what they say.
Climate change suspended reef growth for 2 millennia
Authored by: Anonymous on Friday, July 06 2012 @ 03:21 AM UTC

This all sounds like a retarded and perverted iteration of what science is supposed to be all about. When I read this, I read a parrot and chump who is conflating "Climate Change", a jingoistic, bumper sticker, mush mouthed phrase that is political, not empirical. Doubtless, his grant came from a politically and biased source where it is expected that a certain outcome and linking to environmental extremism and Gaia presupposes that group think is an adequate substitute for skepticism and rigor.

Let's all kill ourselves, so that the Planet can be pure again and not defiled by human invasive species. Nothing more to say except the pitiable state of an ersatz religion of the Church of Environmentalism.

Climate change suspended reef growth for 2 millennia
Authored by: Don Winner on Friday, July 06 2012 @ 02:50 PM UTC

@Chief Engineer: The fundamental revelation highlighted in this article is scientific research - the core samples taken from the reefs themselves - proves coral growth was shut down for more than 2,500 years by naturally occurring climate change. Meaning, way before man ever started burning fossile fuels. In short, what's your problem? Don't like science?


Climate change suspended reef growth for 2 millennia
Authored by: stantiva on Saturday, July 07 2012 @ 09:53 AM UTC

Round Numbers
Age of earth 4,000,000,000 yrs ?
"Modern" Man on earth 40,000 yrs ?
Civilization ? 4,000 yrs
Industrialization 400 yrs

My point is that a lot of stuff has occurred before any influence of Man and more will happen when we are gone. Still we should care for what we have while we have it, but lets not imagine that in the great scheme we have any importance or influence. Some will still argue that we have done a lot of damage in a very short time.