A 30,000-year Record Of Sea Surface Temperatures Off South Australia

Science Daily ^ | 8-3-2007 | American Geophysical Union

[blam]

Source: American Geophysical Union
Date: August 3, 2007

A 30,000-year Record Of Sea Surface Temperatures Off South Australia

Science Daily — Continental glaciers originating at both poles reached their farthest extent about 20,000 years ago, marking a time known as the Last Glacial Maximum.

Comparisons of ice cores from Greenland and Antarctica show that as these glaciers melted, warming occurred in asynchronous stages at the poles. While many northern hemisphere climate records match ice core records from Greenland, few southern hemisphere records exist to compare with ice core data from Antarctica.

Calvo et al. analyze a marine core collected off South Australia and find that it contains detailed signatures of surface temperatures of waters that washed over it since the glacial maximum.

Data from this core match well with Antarctic ice cores and paleoclimate records from the Australian continent, showing no signature of the Younger Dryas, a cooling event known to have occurred in the Northern Hemisphere about 13,000 years ago.

The new core data also reveal a progressive drop in sea surface temperatures over the last 6,500 years, an observation not seen before for the Australian region.

Title: Antarctic deglacial pattern in a 30 kyr record of sea surface temperature offshore South Australia

Authors: Eva Calvo: Institut de Ciències den Mar, Consejo Superior de Investigaciones Científicas, Barcelona, Spain;

Carles Pelejero: Institució Catalana de Recerca i Estudis Avançats and Institut de Ciències den Mar, Consejo Superior de Investigaciones Científicas, Barcelona, Spain;

Patrick De Deckker: Department of Earth and Marine Sciences, The Australian National University, Canberra, Australia;

Graham A. Logan: Petroleum and Marine Division, Geoscience Australia, Canberra, Australia.

Source: Geophysical Research Letters (GRL) paper 10.1029/2007GL029937, 2007

Note: This story has been adapted from a news release issued by American Geophysical Union.

[blam]

GGG Ping.

[cjohnson1]

and just exactly who was doing the measuring 30,000 years ago?? oh wait... the world was flat a few hundred years ago so maybe they’re just GUESSING!

[SunkenCiv]

Thanks blam.

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[SunkenCiv]

Thanks Blam.

To all -- please ping me to other topics which are appropriate for the GGG list. Thanks.

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[GingisK]

Now, all they need to do is to find the farthest extent to which they receded. The cycle would then be better understood.

[Fido969]

So “Global Warming” started 20,000 years ago.

[P-40]

The cycle would then be better understood.

It wouldn't matter now. The debate is already over. The Profit Al Gore said so. :)

[blam]

"So “Global Warming” started 20,000 years ago."

More or less. With a 1,000 year cooling period at the Younger Dryas 13,000 years ago. And then, back to Global Warning which continues to this day. IMO, we're still coming out of the Ice Age. The Last Glacial Maximum(LGM) 18-23,000 years ago was one of the coldest periods during the whole Ice Age. It's probably what doomed the Neanderthals.

[MEGoody]

But, but, but. . .this can’t be true! It’s only mankind and our use of oil that causes global warming.

[Eric in the Ozarks]

And certain land masses in the northern latitudes are now rising, after being squashed by centuries of ice.

[GraniteStateConservative]

Because Gore wasn’t around to sell carbon offset credits.

[ari-freedom]

Mr. Assum Ptions

[LiteKeeper]

YEC INTREP

[allmendream]

<> No, they were taking MEASURMENTS.

[allmendream]

Calvo et al. analyze a marine core collected off South Australia and find that it contains detailed signatures of surface temperatures of waters that washed over it since the glacial maximum.

Data from this core match well with Antarctic ice cores and paleoclimate records from the Australian continent

[djf]

I read it twice...
Is it colder now than it was then or was it warmer back then?

I’m confused.

Scientists used to have to take at least a bare minimum English composition course, but I guess they dropped that requirement.

But thanks for the artickle!

[allmendream]

20,000 years ago was the last glacial maximum. Things have gotten warmer since then. Bush blamed.

[ken21]

the carbon offset thing is a united nations scam.

[xcamel]

[fanfan]

Bump!

[SunkenCiv]

Well, you know how much in favor leftists are of redistribution.

Explains such international success stories as Zimbabwe, Cuba, the USSR...

[ASA Vet]

Artickle?
Okay you proved your bare minimum English point.

[Squantos]

Agree........I’d like to see a copy of that record.....:o)

[Robert A. Cook, PE]

Flip that: This is most likely the the top of the “hottest” part of the temperature plateau BEFORE the global temperatures begin very suddenly sliding back into the NEXT Ice Age.

Today’s peaks is actually a little longer, a little flatter, and a little LOWER (by 2 degrees) than the past four temperature peaks: each of which was rapidly followed by a 8-10 degree DECLINE over about a one-thousand year slump.

[MHGinTN]

I love the way you put that, the ‘Profit’ Al Gore! Bwahahahaha, he sure is into carbon credits don’tchaknow.

[P-40]

I love the way you put that, the ‘Profit’ Al Gore!

Thanks :)

I hope it is not blasphemous to say Profit instead of Prophet...but I think God will understand. :)

[Gene Eric]

>> The new core data also reveal a progressive drop in sea surface temperatures over the last 6,500 years, an observation not seen before for the Australian region.

Does that mean the surface is cooler due to melting ice forms or it’s cooler for other reasons?

[blam]

"Flip that: This is most likely the the top of the “hottest” part of the temperature plateau BEFORE the global temperatures begin very suddenly sliding back into the NEXT Ice Age."

That's more along my line of thinking.

[djf]

I wuz beeing foceeshus.

[MHGinTN]

As a non-experet, I’m of the opinion that massive solar flares heat up the Northern and Southern cold zones to start massive weather cycle changes (heating the Poles starts the slide/plunge into an ice age by cycling too cold air streams southward to change the precipitation cycles).

[gleeaikin]

Interesting article. Saw a recent Catastrophe post about a possible major meteor strike in Canada causing the Younger Dryas. It is possible this would not affect the Southern Hemisphere to a significant degree.

Who was doing the measuring 30,000 years ago. Nobody. These clever scientists have discovered that little plankton organisms, particularly foraminifera, take up different Oxygen isotopes at different temperatures. By measuring the ratio of these oxygen isotopes in the core samples, they can determine the sea surface temperature at the time the little critters died and sank to the bottom.

[djf]

The O16-O18 ratio.

This was also critical in mapping the climate around the time of the Toba explosion 75,000 years ago.

Average temperatures worldwide dropped something like 10 degrees Celsius for over 1,000 years.

Toba is one of Blams favorites...

;-)

[blam]

Late Pleostocene Human Population Bottlenecks. . . (Toba)

[blam]

Ice Age Ends Smashingly: Did A Comet Blow Up Over Eastern Canada? (More) (Carolina Bays)

[djf]

For a time I shared a few emails with a scientist at Udub. My basic question was “what happened 11,500 years ago?”

He said pretty much the same thing, some kind of cometary event. Whatever it was, it wasn’t just a nice slow warming that ended the ice age. It was a fantastic catastrophe, that left scores of large mammals extinct.

[gleeaikin]

I just reread the link you provided on Toba. I noted the comments about possible elephant trunks on mesoamerican structures. My recollection is that mammoths may have still been around in north america 10,000 ya. Actually a few may have survived even longer. I visited a small museum, I think it was for the Battle of the Cowpens, 1781. There were a lot of Indian artifacts with dates attached. If I remember correctly, there was an abrupt shift from large spears and other stone weapons about 7 or 8 thousand years ago, to much smaller weapon heads. This may have represented the disappearance of most large game animals.

As I am writing this it suddenly occurs to me that the eruption of Mt. Mazama (Crater Lake), between 7 and 8 Kya might have been the final blow for large creatures like mammoths. It is reported that the Indians of the northwest had legends and stories that indicated a long term memory of the Mazama event. Since some of the “elephant” elements on mesoamerican buildings are 1 to 2 thousand years earlier than the recollected stories of the northwest Indians, perhaps these reflect long ago legends and memories of the mammoths further north.

The Aztecs conquered by Cortez had only been at Mexico City a few hundred years. Their Uto-Aztecan language originated much further north. It is not unreasonable to think that the ancestors of the mesoamericans might have migrated south due to the climate changes caused by Mt. Mazama, bringing their elephant legends and lore with them.

[blam]

"As I am writing this it suddenly occurs to me that the eruption of Mt. Mazama (Crater Lake), between 7 and 8 Kya might have been the final blow for large creatures like mammoths. It is reported that the Indians of the northwest had legends and stories that indicated a long term memory of the Mazama event. Since some of the “elephant” elements on mesoamerican buildings are 1 to 2 thousand years earlier than the recollected stories of the northwest Indians, perhaps these reflect long ago legends and memories of the mammoths further north."

Thanks, I was not familiar with Mount Mazama.

"Mazama is most famous for a catastrophic volcanic eruption that occurred around 5,677 (± 150) BC[1]. The eruption, estimated to have been 42 times more powerful than Mount St. Helens' 1980 blast

[CodeMasterPhilzar]

So “Global Warming” started 20,000 years ago.

Yeah, but it is still Bush's fault! ;-/