Sentences with phrase «geological time the levels»

Understanding the carbon - cycle was key to explaining this: the realisation was that throughout geological time the levels of carbon dioxide and other non-condensing greenhouse - gases had exterted major controls on the planetary temperature.

Understanding the carbon - cycle was key to explaining this: the realisation was that throughout geological time the levels of carbon dioxide and other non-condensing greenhouse - gases had exterted major controls on the planetary temperature.

Not exact matches

During Expedition 359, Eberli's team drilled seven holes along the Maldives Archipelago to collect sediments that hold records of past sea level and environmental changes during the Neogene, a geological time period that began 23 million years ago.

Using detailed, ground - level data from the United States Geological Survey (USGS) and Environmental Protection Agency, Cardenas and Kiel analyzed the waterways for sinuosity (how much they bend and curve); the texture of the materials along the waterways; the time spent in the sediment (known as the hyporheic zone); and the rate at which the water flows through the sediment.

When the planet's big ice sheets collapsed at the end of the last ice age, their melting caused global sea levels to rise as much as 100 meters in roughly 10,000 years, which is fast in geological time, Mann noted.

This is a reference level within recent strata somewhere in the world that will be proposed to most clearly and consistently characterise the changes as the Holocene, which represents the last 11,700 years of geological time on this planet, gave way into the Anthropocene about 65 years ago.

The active littoral zone changes throughout geological time by an interplay between sea - level change and regional uplift.

A possible glimpse of our future would be the Paleocene - Eocene Thermal Maximum (wikipedia the PETM), when a massive release of methane clathrates or other factors caused the level of CO2 in the atmosphere to rise to 1000ppm or more over a relatively brief period of time (in geological terms).

Hansen's paper last summer looked at 3 time scales — 10s, 100s, and 1000s of years — for the scary sea level rises and decided that millennial was out: the geological record showed that if the seas were to rise, they'd rise pretty fast.

Certainly not the level, the planet has been several times higher in the geological past, no harm done.

While the conditions in the geological past are useful indicators in suggesting climate and atmospheric conditions only vary within a a certain range (for example, that life has existed for over 3 billion years indicates that the oxygen level of the atmosphere has stayed between about 20 and 25 % throughout that time), I also think some skeptics are too quick to suggest the lack of correlation between temperature and CO2 during the last 550 million years falsifies the link between CO2 and warming (too many differences in conditions to allow any such a conclusion to be drawn — for example the Ordovician with high CO2 and an ice age didn't have any terrestrial life).

And until now they were thought to be rare geological events, dating back to a time when CO2 levels were several times higher than they are now.

The difference of more than two orders of magnitudes between sea level change on a human time scale and sea level change on a geological time scale is the result of several mechanisms affect sea level at different amplitudes and over different time periods.

The present sea level rise now observed is very small relative to sea level changes on geological time scales.

In the geological past, its level has been ten times or more higher than its present value; in fact, our major food crops developed when CO2 levels were about five times higher.

With current greenhouse gas levels now in the range of 400 - 405 parts per million coinciding with substantial jumps in glacial melt and sea level rise, it may be worth taking a look back at times in the geological past when atmospheric heating conditions were similar to those seen today.

Though the Tibetan earthquake was going to happen at some time, it is possible that changes in ice loading on Himalayan glaciers, changes in water volume outflows in the annual Asian monsoon, and sea level rise adding pressure to the geological plates below coastlines — especially in low - lying Bangladesh — had an impact.

The relationship of CO2 levels to temperature, and changing levels of both, in geological time is an issue that's quite intriguing.

None of the attempted explanations for changing CO2 levels in geological time — I'm thinking here of million - year scale — seem very convincing to me.

One of the parameters is high stand or low stand conditions based on sea level transgression / regression curves which is related to long term climate, but I am not aware of any oil companies that use anything remotely resembling what I understand to be a climate model with forcings, and certainly not one driven by something like CO2, solar or anyhting else, simply because you can not know the necessary parameters over the millions of years of geological time that you are interested in modelling.

According to the U.S. Geological Survey, sea levels in North Carolina and other «hotspots» along the East Coast between North Carolina and Massachusetts are rising at three to four times the rate worldwide.

The steady state level of atmospheric CO2, in geological time, is dependent on the input rate and the efflux rate.

Sea levels are rising and falling due to techtonic plates squashed after the last ice age and due to their constant (in geological time) movement.

My real point was that the CO2 levels in geological time scales are not really comparable to current human emissions - because on geological time scales there is a removal process.

The past has been much warmer and better off, CO2 levels in the geological past were 3 - 4 TIMES higher than today.