Oh wow!

[Crick]

The data on which my original comment was based might be a good place to start. It is based on the continuous sampling of ice cores and shows that the current temperature climb is taking place at ten times the rate experienced during glacial/interglacial warming.

 

[ding]

The data on which my original comment was based might be a good place to start. It is based on the continuous sampling of ice cores and shows that the current temperature climb is taking place at ten times the rate experienced during glacial/interglacial warming.

Do you have any scientific study or paper that addresses the resolution of the oxygen isotope curve?

 

[ding]

"...Their results indicate that detailed correlations are possible at the sampling interval (2000-4000 yr in the records used)."

http://ocp.ldeo.columbia.edu/res/div/ocp/pub/martinson/martinson87.pdf

 

[Old Rocks]

Age Dating and the Orbital Theory of the Ice Ages: Development of a High-Resolution 0 to 300,000-Year Chronostratigraphyl

DOUGLAS G. MARTINSON,* NICKLAS G. PIsrAs,t JAMES D. HAYS,* JOHN IMBRIE,$ THEODORE C. MOORE, JR. ,§ AND NICHOLAS J. SHACKLETONI *Lament-Doherty

Geological Observatory, Palisades, New York 10964. and Department of Geological Sciences, Columbia University, New York, New York 10027; ‘College of Oceanography, Oregon State University, Corvallis, Oregon 97331; $Department of Geological Sciences, Browsn University. Providence, Rhode Island 02912; #Exxon Production Research, Houston, Texas 77001: and ISab-Department of Quaternary Research, The Godwin Laboratory, Free School Lane, Cambridge, England CB2 3RS

Using the concept of “orbital tuning,” a continuous, high-resolution deep-sea chronostratigraphy has been developed spanning the last 300,000 yr. The chronology is developed using a stacked oxygen-isotope stratigraphy and four different orbital tuning approaches, each of which is based upon a different assumption concerning the response of the orbital signal recorded in the data. Each approach yields a separate chronology. The error measured by the standard deviation about the average of these four results (which represents the “best” chronology) has an average magnitude of only 2500 yr. This small value indicates that the chronology produced is insensitive to the specific orbital tuning technique used. Excellent convergence between chronologies developed using each of five different paleoclimatological indicators (from a single core) is also obtained. The resultant chronology is also insensitive to the specific indicator used. The error associated with each tuning approach is estimated independently and propagated through to the average result. The resulting error estimate is independent of that associated with the degree of convergence and has an average magnitude of 3500 yr. in excellent agreement with the 2500-yr estimate. Transfer of the final chronology to the stacked record leads to an estimated error of -+ 1.500 yr. Thus the final chronology has an average error of -t 5000 yr. Cl 1987 Unavenity of Waahlngton.

Hmmmmmm..............

 

[Old Rocks]

How is Today’s Warming Different from the Past?
Earth has experienced climate change in the past without help from humanity. We know about past climates because of evidence left in tree rings, layers of ice in glaciers, ocean sediments, coral reefs, and layers of sedimentary rocks. For example, bubbles of air in glacial ice trap tiny samples of Earth’s atmosphere, giving scientists a history of greenhouse gases that stretches back more than 800,000 years. The chemical make-up of the ice provides clues to the average global temperature.

See the Earth Observatory’s series Paleoclimatology for details about how scientists study past climates.

Glacial ice and air bubbles trapped in it (top) preserve an 800,000-year record of temperature & carbon dioxide. Earth has cycled between ice ages (low points, large negative anomalies) and warm interglacials (peaks). (Photograph courtesy National Snow & Ice Data Center. NASA graph by Robert Simmon, based on data from Jouzel et al., 2007.)

Using this ancient evidence, scientists have built a record of Earth’s past climates, or “paleoclimates.” The paleoclimate record combined with global models shows past ice ages as well as periods even warmer than today. But the paleoclimate record also reveals that the current climatic warming is occurring much more rapidly than past warming events.

As the Earth moved out of ice ages over the past million years, the global temperature rose a total of 4 to 7 degrees Celsius over about 5,000 years. In the past century alone, the temperature has climbed 0.7 degrees Celsius, roughly ten times faster than the average rate of ice-age-recovery warming.

Temperature histories from paleoclimate data (green line) compared to the history based on modern instruments (blue line) suggest that global temperature is warmer now than it has been in the past 1,000 years, and possibly longer. (Graph adapted from Mann et al., 2008.)

Models predict that Earth will warm between 2 and 6 degrees Celsius in the next century. When global warming has happened at various times in the past two million years, it has taken the planet about 5,000 years to warm 5 degrees. The predicted rate of warming for the next century is at least 20 times faster. This rate of change is extremely unusual.

Global Warming : Feature Articles

Resolution from the ice cores is one year, for most of the way down. So we see that the present rate of warming is very unusual, and only exceeded by the rate at the beginning and end of the Younger Dryas. And those were extinction times for large mammals.

 

[SSDD]

How is Today’s Warming Different from the Past?
Earth has experienced climate change in the past without help from humanity. We know about past climates because of evidence left in tree rings, layers of ice in glaciers, ocean sediments, coral reefs, and layers of sedimentary rocks. For example, bubbles of air in glacial ice trap tiny samples of Earth’s atmosphere, giving scientists a history of greenhouse gases that stretches back more than 800,000 years. The chemical make-up of the ice provides clues to the average global temperature.

See the Earth Observatory’s series Paleoclimatology for details about how scientists study past climates.

Glacial ice and air bubbles trapped in it (top) preserve an 800,000-year record of temperature & carbon dioxide. Earth has cycled between ice ages (low points, large negative anomalies) and warm interglacials (peaks). (Photograph courtesy National Snow & Ice Data Center. NASA graph by Robert Simmon, based on data from Jouzel et al., 2007.)

Using this ancient evidence, scientists have built a record of Earth’s past climates, or “paleoclimates.” The paleoclimate record combined with global models shows past ice ages as well as periods even warmer than today. But the paleoclimate record also reveals that the current climatic warming is occurring much more rapidly than past warming events.

As the Earth moved out of ice ages over the past million years, the global temperature rose a total of 4 to 7 degrees Celsius over about 5,000 years. In the past century alone, the temperature has climbed 0.7 degrees Celsius, roughly ten times faster than the average rate of ice-age-recovery warming.

Temperature histories from paleoclimate data (green line) compared to the history based on modern instruments (blue line) suggest that global temperature is warmer now than it has been in the past 1,000 years, and possibly longer. (Graph adapted from Mann et al., 2008.)

Models predict that Earth will warm between 2 and 6 degrees Celsius in the next century. When global warming has happened at various times in the past two million years, it has taken the planet about 5,000 years to warm 5 degrees. The predicted rate of warming for the next century is at least 20 times faster. This rate of change is extremely unusual.

Global Warming : Feature Articles

Resolution from the ice cores is one year, for most of the way down. So we see that the present rate of warming is very unusual, and only exceeded by the rate at the beginning and end of the Younger Dryas. And those were extinction times for large mammals.

More predictions from models that have already proven themselves to be terribly flawed...and you believe them?....how unsurprising is that rocks?

Resolution from the ice cores is one year, for most of the way down. So we see that the present rate of warming is very unusual, and only exceeded by the rate at the beginning and end of the Younger Dryas. And those were extinction times for large mammals.

I guess your guys never actually looked at ice cores...here, you have a look. that ice core with a resolution of 1 year shows us that the rate of change we are seeing isn't unusual at all...in fact, it is quite mild.

 

[Crick]

Let's have a look at your best. That spike at about 8,000 years BP rises from -32.5 to -28.75C, a change of 3.75 degrees. The time span looks to go from 8,220 years to 7700 years BP, a span of 520 years. 3.75 / 520 = 0.72C per century. The entire spike is over a thousand years long. It would have been clearly visible in the Vostok and EPICA core data despite the fact that the time span of your entire graph here would occupy 2 percent of those data's duration. The delta over your entire span 2C/10,000 = 0.02C/century.

And, on top of that, this is Greenland and this is the Younger Dryas. This IS the best you've got.

 

[ding]

Age Dating and the Orbital Theory of the Ice Ages: Development of a High-Resolution 0 to 300,000-Year Chronostratigraphyl

DOUGLAS G. MARTINSON,* NICKLAS G. PIsrAs,t JAMES D. HAYS,* JOHN IMBRIE,$ THEODORE C. MOORE, JR. ,§ AND NICHOLAS J. SHACKLETONI *Lament-Doherty

Geological Observatory, Palisades, New York 10964. and Department of Geological Sciences, Columbia University, New York, New York 10027; ‘College of Oceanography, Oregon State University, Corvallis, Oregon 97331; $Department of Geological Sciences, Browsn University. Providence, Rhode Island 02912; #Exxon Production Research, Houston, Texas 77001: and ISab-Department of Quaternary Research, The Godwin Laboratory, Free School Lane, Cambridge, England CB2 3RS

Using the concept of “orbital tuning,” a continuous, high-resolution deep-sea chronostratigraphy has been developed spanning the last 300,000 yr. The chronology is developed using a stacked oxygen-isotope stratigraphy and four different orbital tuning approaches, each of which is based upon a different assumption concerning the response of the orbital signal recorded in the data. Each approach yields a separate chronology. The error measured by the standard deviation about the average of these four results (which represents the “best” chronology) has an average magnitude of only 2500 yr. This small value indicates that the chronology produced is insensitive to the specific orbital tuning technique used. Excellent convergence between chronologies developed using each of five different paleoclimatological indicators (from a single core) is also obtained. The resultant chronology is also insensitive to the specific indicator used. The error associated with each tuning approach is estimated independently and propagated through to the average result. The resulting error estimate is independent of that associated with the degree of convergence and has an average magnitude of 3500 yr. in excellent agreement with the 2500-yr estimate. Transfer of the final chronology to the stacked record leads to an estimated error of -+ 1.500 yr. Thus the final chronology has an average error of -t 5000 yr. Cl 1987 Unavenity of Waahlngton.

Hmmmmmm..............

Right that proves my point. Resolution is 3500 years. You can't make an apples to apples comparison because of the vastly different levels of resolution from past interglacials compared to the last 50 years. It can't be done. At least not honestly.

 

[Old Rocks]

Not from oxygen isotopes can it be done. However, from ice cores it not only can be done, it has been done by NASA scientists, and they state that the present rate of warming is about ten times the normal for the last century, and, for this century, looks like it will be about 20 times normal. Post #105.