Sentences with phrase «ice cores»
Ice cores are long cylinders of ice extracted from areas of thick ice, such as glaciers or ice sheets. They contain information about the past climate and environment because they preserve layers and bubbles of ancient air. Scientists study these ice cores to understand how our planet's climate has changed over thousands of years. Full definition
Consequently, atmospheric CO2 is increasing ten times faster than any rate detected in ice core data over the last 22,000 years.
skepticalscience.com
(In fact, atmospheric CO2 is increasing ten times faster than any rate detected in ice core data over the last 22,000 years).
We should use data from ice core of the past ten thousand years and project the same cycle forward.
This analysis of ice cores relies on the assumption that there is limited biological activity altering the environment in the snow during its transition into ice.
The quoted CO2 levels from ice core samples remained fairly constant through this period of ten thousand years yet we had two periods of much warmer temps.
We can't measure actual captured air, as we do with ice core samples.
The CO2 in short gets depleted in ice core measurements and has not been corrected properly.
This should make it clear that ice cores do not tell the local temperature.
These intervals are often analyzed for volcanic sulfate by ice core scientists.
However, they are more pronounced on northern latitude ice core temperature proxies.
Ice cores provide evidence for variation in greenhouse gas concentrations over the past 800,000 years.
The current rate of CO2 rise in atmospheric concentrations is unprecedented with respect to the highest resolution ice core records which cover the last 22,000 years.
The graph includes ice core data for CO2 levels before 1950.
Ice cores suggest that changes to atmospheric CO2 concentration follow changes to temperature by ~ 800 years.
There's a new ice core with CO2 going back 800,000 about which I heard a preliminary talk at a meeting last fall.
Comparison with the CO2 levels measured in air extracted from ice cores indicates that the current concentrations are higher than they have been in at least 800,000 years (see Question 6).
I also need to put together an article on the mechanisms of what ice core data gives.
That is because ice cores are not location specific to temperature.
By analyzing ice cores, the team found a bacteria thriving in a salt - dense environment that hasn't been exposed to air or sunlight for at least 3,000 years.
Under his leadership, the field of ice core research took cohesive shape.
Ancient ice core samples show that temperature changes and CO2 levels are not correlated.
But where do ice cores come from, and what do they tell us about climate change?
In the 1990s, he and his colleagues found evidence in ice cores which suggested that the climate has sometimes gone through very rapid and abrupt climate changes.
And according to scientists who have 800,000 years of carbon records derived from glacial ice core samples, there is a strong link between earth temperatures and increased carbon dioxide levels in the atmosphere.
To investigate, the researchers examined ice core records.
Although ice cores demonstrate that climate, in the distant past, sometimes changed very abruptly, future temperatures resulting from our current emissions course will likely exceed anything ever experienced by humans.
First, he argues that since ice core records show that temperature generally started changing before CO2 concentrations by several hundred years, CO2 can't be a major cause of warming.
It would be a lot of work but there are many ice cores out there and a lot of other paleo data as well, from wide reaching locations.
This mission represented the first stage in demonstrating the feasibility of the «ice core archive» project.