Sentences with phrase «atmospheric changes occur»
With the atmospheric changes occurring these days, however, this cycle could happen in centuries.
http://www.slate.com/ Not exact matches
During the PETM, atmospheric carbon dioxide more than doubled and global temperatures rose by 5 degrees Celsius, an increase that is comparable with the change that may occur by later next century on modern Earth.
«The change in flux described by our model happens over extremely long time periods, and it would be a mistake to think that these processes that are bringing about any of the atmospheric changes are occurring due to anthropomorphic climate change,» he said.
«These findings add to mounting evidence suggesting that there are sweet spots or «windows of opportunity» within climate space where so - called boundary conditions, such as the level of atmospheric CO2 or the size of continental ice sheets, make abrupt change more likely to occur.
There is, therefore, much current interest in how coccolithophore calcification might be affected by climate change and ocean acidification, both of which occur as atmospheric carbon dioxide increases.
The regions where droughts have occurred seem to be determined largely by changes in SSTs, especially in the tropics, through associated changes in the atmospheric circulation and precipitation.
Each time a switch occurs, the changes to ocean and atmospheric circulation affect temperature and rainfall patterns across the globe.
Human - caused climate change has been occurring over the last 200 yr, largely because of the combustion of fossil fuels and subsequent increase of atmospheric CO2.
By this time, atmospheric CO2 concentration will probably have become sufficiently high (and we will be committed to further increases) that a climatic change significantly larger than any which has occurred in the past century could be unavoidable.»
For example, the moods of dogs that live in areas where hurricanes occur can be impacted by the change in atmospheric pressure.
Do you really think the fact that waters are warmer and atmospheric moisture content is higher now due to man - made global warming (not to mention the «blocking high» over Greenland due to Arctic climate change) may be less of an influence on Hurricane Sandy than some other currently unobserved changes to our climate that occurred 3000 years ago?
The claim of two years of 3 ppmv / yr occurred because of the way the CO2 time series straddled almost perfectly those two years (2015 - 6) along with the long term anthro atmospheric rate of change.
Because melting is so much more energetically efficient than sublimation, the main way that moderate changes in atmospheric conditions — including air temperature — affect ablation is through changing the number of hours during which melting occurs, and the amount of energy available for melting.
It is no coincidence that shifts in ocean and atmospheric indices occur at the same time as changes in the trajectory of global surface temperature.
Although Holocene climate events are relatively minor on a glacial / interglacial perspective, the small Holocene changes in the polar vortex and atmospheric storminess documented by O'Brien et al. (1995) would probably cause widespread disruption to human society if they were to occur in the future (Keigwin and Boyle 2000:1343).»
Here's my uneducated question — while I respect Gavin's comments about not abusing the science, it seems to me that many measurable indicators of climate change are (to the extent I can tell) occurring / progressing / worsening faster than predicted by most models, whether we're talking about atmospheric CO2 levels, arctic ice melting, glacial retreat, etc..
One minute change in the atmospheric regime can slowly effect further changes in the system and the chain reaction can occur, which, in the end, could shift a jet stream a few kilometres and create conditions possible for storm intensification, which may result in the flooding of an area where the storm would not have been or would have been greatly minimised.
``... a second - order relationship may be more likely (i.e. that cloud changes only occur with GCR changes if atmospheric conditions are suitable).
The Antarctic ice increase is occurring in a limited region near the Ross Sea, and is related to the ozone hole through a fairly complicated change in atmospheric dynamics.
Rapid changes of atmospheric composition may have occurred at least occasionally.
As a youth I participated in many of my father's experiments, observing first - hand the benefits of atmospheric CO2 on plant life and the manifold problems with the model - based theory of climate change, all of which events occurred long, long before James Hansen stood in front of the U.S. Senate and brought the CO2 debate to the eyes of the public in 1988.
In their latest Science paper submittal Jim Hansen, et al. argue that we must reduce atmospheric CO2 to below 350 ppm because so - called «slow feedbacks» such as changes in ice sheet albedo are occurring much faster than expected.
Exceptions could occur in areas with the smallest reductions of extreme cold in western North America, the North Atlantic and southern Europe and Asia due to atmospheric circulation changes.
Oceans are wide and changes of atmospheric CO2 concentration has its influence everywhere while supply from weathering occurs on the coasts and through the river discharges.
But the evidence shows this can't be true; temperature changes before CO2 in every record of any duration for any time period; CO2 variability does not correlate with temperature at any point in the last 600 million years; atmospheric CO2 levels are currently at the lowest level in that period; in the 20th century most warming occurred before 1940 when human production of CO2 was very small; human production of CO2 increased the most after 1940 but global temperatures declined to 1985; from 2000 global temperatures declined while CO2 levels increased; and any reduction in CO2 threatens plant life, oxygen production, and therefore all life on the planet.
In the real world the most obvious and most common reason for a change in atmospheric density occurs naturally when the oceans are in warming mode and solar irradiation is high as during the period 1975 to 1998.
This thesis presents the results of several general circulation model simulations aimed at studying the effect of ocean circulation changes when they occur in conjunction with increased atmospheric trace gas concentrations.
Some changes occurring are atmospheric density changes which would effect the insulation value of the atmosphere.
As far as we know, the «airborne fraction» (percentage of emitted CO2 remaining atmospheric) has not been changing greatly over the past century, and if any change is occurring, the fraction is perhaps increasing very slightly due to greater saturation of the oceanic sink.
Indeed, this is why I have repeatedly said to you: «Any assessment of the causes of the rise of atmospheric CO2 concentration over a period of years requires assessment of the changes that occur each year (because the annual increase to CO2 in the atmosphere is the residual of the seasonal changes to CO2 in the atmosphere).»
Nor does it seem a coincidence that shifts in ocean and atmospheric indices occur at the same time as changes in the trajectory of global surface temperature.
For example if Seager and Battisti are correct than a change in atmospheric ciruculation occurs, this would alter the moisture source and potentially the isotope signature of the snowpack falling on the GIS.
The authors use a two - dimensional atmospheric model to simulate the nitrate and ozone changes associated with the A.D. 1908 Tunguska event where a bolide airburst occurred over Siberia, Russia.
It would have to be shown that the recent temperature record can be statistically significantly distinguished from the statistically significant warming signal, which can be detected when performing an analysis that uses data over multiple decades, from the mid-1970ies to present, or from the mid-1970ies up to the time, when the alleged change in the behavior of the global atmospheric temperature is supposed to have occurred.
It has been established experimentally that, at ca 4.0 ka BP, there occurred a global change in the structure of atmospheric circulation, which coincided in time with the discharge of glacial masses from Greenland to North Atlantic and a solar activity minimum.
The abrupt and pronounced historical temperature and sea level rise events occurred without any significant changes in atmospheric CO2 levels.
«The authors write that «the El Niño - Southern Oscillation (ENSO) is a naturally occurring fluctuation,» whereby «on a timescale of two to seven years, the eastern equatorial Pacific climate varies between anomalously cold (La Niña) and warm (El Niño) conditions,» and that «these swings in temperature are accompanied by changes in the structure of the subsurface ocean, variability in the strength of the equatorial easterly trade winds, shifts in the position of atmospheric convection, and global teleconnection patterns associated with these changes that lead to variations in rainfall and weather patterns in many parts of the world,» which end up affecting «ecosystems, agriculture, freshwater supplies, hurricanes and other severe weather events worldwide.»»
What it does show if there is a reversal however, like the pause in atmospheric temperatures, is that those who tie calamity to short time frame changes must accept that they are wrong when a reversal occurs in a similar short time frame.
An expanding area of research since the SAR is the consideration of whether climate change may be realised as preferred modes of non-linear naturally occurring atmospheric circulation patterns, or so - called weather regimes as proposed by Palmer (1999).
The most definitive 30 - year P trends occur along the northern Russian border and adjacent to Hudson's Bay (> 75 % change of a wetter future), likely in response to diminished sea ice cover and resulting increase in atmospheric moisture, and in some areas of northern Africa and the Middle East (< 35 % chance of wetting, equivalent to > 65 % chance of drying; Fig. 8b).
«Trends in observed atmospheric water vapour are hampered by inhomogeneities in data records, which occur when measurement programmes are discontinued because of, for example, the limited lifespans of satellite missions or insufficiently documented or understood changes in instrumentation.
Singh and her Lamont colleagues research climate change impacts on weather patterns by analyzing weather trends in daily temperatures, precipitation, and atmospheric patterns that have occurred during the past 40 years, in the post-satellite era.
At any rate, it seems likely to us that some major and abrupt change in the atmospheric composition and / or molecular structure is occurring at the tropopause.
Climate change is present in every single meteorological event, in that these events are occurring within a baseline atmospheric environment that has shifted in favor of more intense weather events.
The reasons are several and include: (a) Their emissions levels are very high compared to others; (b) Huge reductions in emissions from existing emissions levels are necessary to achieve safe atmospheric stabilization levels; and (c) Climate change damages to some people, not to mention plants, animals, and ecological systems, are already occurring.
You do not disagree with my point but now throw in changes in atmospheric CO2 as evidence that the current rate of warming must have been greater than that occurring during some 50 + year period of the MWP, when there was no such increase in human GHGs..
Perhaps most important, say the NIPCC authors, the UN's Intergovernmental Panel on Climate Change has greatly exaggerated the amount of warming that is likely to occur if atmospheric CO2 concentrations were to double, to around 800 ppm (0.08 %).
Recognizing that the carbon cycle is very complex, so there are reasons that the simple comparison could be off (going either way of course), the chart suggests that only 20 % of the total anthropogenic CO2 emissions occurred in the same period where 50 % of the total change in atmospheric CO2 concentration were observed.
What seems more interesting is the change in ocean and atmospheric circulation that occurred in the 1998/2001 climate shift — climate shifts are a relatively new concept but one that is central to understanding climate.
The necessary change being in atmospheric volume it is clear that circulation changes will occur and that leads to my ideas about climate change that I have already set out extensively.