by Dr R. Spencer, Sep 29, 2022 in WUWT
With Hurricane Ian (now a tropical storm) exiting the east coast of Florida, there is no shortage of news reports tying this storm to climate change. Even if those claims actually include data to support their case, those data are usually for cherry-picked regions and time periods. If global warming is causing a change in tropical cyclone activity, it should show up in global statistics.
The latest peer-reviewed study (March 2022, here) of the accumulated wind energy in tropical cyclones since 1990 (when we started have sufficient global data) showed a decrease in hurricane activity. There was an increase in Atlantic activity, but this was matched by an even larger decrease in Pacific activity, due to a shift from El Nino to La Nina conditions during that time.
So, yes, there is climate change involved in the uptick in Atlantic activity in recent decades. But it’s natural.
Looking at just the numbers of global hurricanes since 1980, we see no obvious trends.
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by P. Homewood, July 24, 201 in NotatLotofPeopleKnowThat
Coral reefs are considered one of the most threatened ecosystems on the planet and are dying at alarming rates around the world. Scientists attribute coral bleaching and ultimately massive coral death to a number of environmental stressors, in particular, warming water temperatures due to climate change.
A study published in the international journal Marine Biology, reveals what’s really killing coral reefs. With 30 years of unique data from Looe Key Reef in the lower Florida Keys, researchers from Florida Atlantic University’s Harbor Branch Oceanographic Institute and collaborators have discovered that the problem of coral bleaching is not just due to a warming planet, but also a planet that is simultaneously being enriched with reactive nitrogen from multiple sources.
Improperly treated sewage, fertilizers and top soil are elevating nitrogen levels, which are causing phosphorus starvation in the corals, reducing their temperature threshold for “bleaching.” These coral reefs were dying off long before they were impacted by rising water temperatures. This study represents the longest record of reactive nutrients and algae concentrations for coral reefs anywhere in the world.
“Our results provide compelling evidence that nitrogen loading from the Florida Keys and greater Everglades ecosystem caused by humans, rather than warming temperatures, is the primary driver of coral reef degradation at Looe Key Sanctuary Preservation Area during our long-term study,” said Brian Lapointe, Ph.D., senior author and a research professor at FAU’s Harbor Branch.
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https://phys.org/news/2019-07-years-unique-reveal-coral-reefs.html
There is the usual armwaving about climate change, but no evidence is presented as to why a small increase in CO2 levels should have the slightest effect on water temperatures or coral development, when the climate has been much warmer for most of the period since the end of the ice age.
As is usually the case with environmental degradation and species decline, it is the obvious factors which are responsible.
by Carly Cassella, July 20, 2019 in WUWT
Coral reefs are one of the most threatened ecosystems on our planet, and in the past two decades alone, half of the coral in Florida has died off completely. Global warming is known to be a deadly factor, but rising ocean temperatures are only part of the story.
Thirty years of research in the Looe Key Sanctuary Preservation Area (LKSPA) on the southern tip of the Florida Keys has now revealed the cost of a devastating threat to coral that rivals even climate change: direct human pollution.
For years, agricultural run-off and improperly treated sewage have flowed into Florida’s ocean waters from the northern Everglades, elevating the sanctuary’s nitrogen levels and lowering the reef’s temperature threshold for bleaching, researchers say.
As a result of this deadly combination, coral cover in the region has declined from nearly 33 percent in 1984 to less than 6 percent in 2008.
In their analysis, the authors found that three mass bleaching events that occurred during these years only happened after heavy rainfall and increased land-based runoffs. In other words, if we can reduce the amount of local pollution that makes its way into our oceans, we might be able to reduce the worst of the damage.
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Klein & Orlando, Bulletin of Marine Science, 1994
by Brook Hays, July 16, 2019 in ClimateChangeDispatch
Corals are disappearing across the world’s oceans, and most scientists have pointed to warming water temperatures — the result of climate change — as the primary driver.
But new research suggests nitrogen pollution is the main cause of coral bleaching in Florida.
The study, published this week in the journal Marine Biology, was compiled using the three-decades worth of observational data collected at the Looe Key Reef in the lower Florida Keys.
“Our results provide compelling evidence that nitrogen loading from the Florida Keys and greater Everglades ecosystem caused by humans, rather than warming temperatures, is the primary driver of coral reef degradation at Looe Key Sanctuary Preservation Area,” lead study author Brian Lapointe, research professor at Florida Atlantic University’s Harbor Branch Oceanographic Institute, said in a news release.
Data collected at the test site showed nutrient runoff has boosted the nitrogen-phosphorus ratio in reef algae.
As more and more treated sewage and fertilizers from commercial farms rinse into local waterways and flood the oceans with nutrients, including reactive nitrogen, corals are unable to absorb sufficient levels of phosphorous.
“Our results provide compelling evidence that nitrogen loading from the Florida Keys and greater Everglades ecosystem caused by humans, rather than warming temperatures, is the primary driver of coral reef degradation at Looe Key Sanctuary Preservation Area,” lead study author Brian Lapointe, research professor at Florida Atlantic University’s Harbor Branch Oceanographic Institute, said in a news release.
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La géologie, une science plus que passionnante … et diverse
