Sentences with phrase «feedbacks enhanced the warming»

Not exact matches

Climate projections need to account for enhanced warming due to global warming feedbacks as discussed by James Zachos, professor of Earth sciences at the University of California, Santa Cruz at the annual meeting of the American Association for the Advancement of Science (AAAS) in St. Louis in Feb, 2006.

The silicate + CO2 - > different silicate + carbonate chemical weathering rate tends to increase with temperature globally, and so is a negative feedback (but is too slow to damp out short term changes)-- but chemical weathering is also affected by vegetation, land area, and terrain (and minerology, though I'm not sure how much that varies among entire mountain ranges or climate zones)-- ie mountanous regions which are in the vicinity of a warm rainy climate are ideal for enhancing chemical weathering (see Appalachians in the Paleozoic, more recently the Himalayas).

This chemical weathering process is too slow to damp out shorter - term fluctuations, and there are some complexities — glaciation can enhance the mechanical erosion that provides surface area for chemical weathering (some of which may be realized after a time delay — ie when the subsequent warming occurs — dramatically snow in a Snowball Earth scenario, where the frigid conditions essentially shut down all chemical weathering, allowing CO2 to build up to the point where it thaws the equatorial region, at which point runaway albedo feedback drives the Earth into a carbonic acid sauna, which ends via rapid carbonate rock formation), while lower sea level may increase the oxidation of organic C in sediments but also provide more land surface for erosion... etc..

(I wonder if such enhanced wind driven mising would in effect be a negative feedback on warming rates, enhaning ocean thermal damping.)

Climate projections need to account for enhanced warming due to global warming feedbacks as discussed by James Zachos, professor of Earth sciences at the University of California, Santa Cruz at the annual meeting of the American Association for the Advancement of Science (AAAS) in St. Louis in Feb, 2006.

If the enhanced atmospheric warming from a CO2 - induced temperature rise of 1 oC results in enhanced water vapour that gives an additional warming of say x oC, the overall warming (doubled CO2 + water vapour feedback; leaving out other feedbacks for now) will be something like 1.1 * (1 + x + x2 + x3...) or 1.1 / (1 - x)-RSB-.

What I'm trying to get at is some simplistic estimate of the water vapour feedback that results from an enhanced CO2 - induced warming of say 1.1 oC from the CO2 RF of around 4 Wm - 2.

A warming climate and enhanced winter snow are likely to exacerbate positive feedbacks between climate and permafrost thawing....

The same feedback mechanisms that are proposed to enhance the CO2 warming are also applicable to solar forcing, including warming induced increases in methane release.

Re 9 wili — I know of a paper suggesting, as I recall, that enhanced «backradiation» (downward radiation reaching the surface emitted by the air / clouds) contributed more to Arctic amplification specifically in the cold part of the year (just to be clear, backradiation should generally increase with any warming (aside from greenhouse feedbacks) and more so with a warming due to an increase in the greenhouse effect (including feedbacks like water vapor and, if positive, clouds, though regional changes in water vapor and clouds can go against the global trend); otherwise it was always my understanding that the albedo feedback was key (while sea ice decreases so far have been more a summer phenomenon (when it would be warmer to begin with), the heat capacity of the sea prevents much temperature response, but there is a greater build up of heat from the albedo feedback, and this is released in the cold part of the year when ice forms later or would have formed or would have been thicker; the seasonal effect of reduced winter snow cover decreasing at those latitudes which still recieve sunlight in the winter would not be so delayed).

This is what I get out of it: the Arctic - ice - albedo situation is more complicated than earlier thought (due to clouds, sun - filled summers, dark winters, etc), but NET EFFECT, the ice loss and all these other related factors (some negative feedbacks) act as a positive feedback and enhance global warming.

So, the positive feedback between melt and velocities implies that more melt leads to higher velocities, which bring in more ice from cold regions to warm regions which increases the melt and hence the velocity etc, with as a final result a rapid loss of ice and hence an enhanced increased sea level.

Climate Myth: Climate sensitivity is low «His [Dr Spencer's] latest research demonstrates that — in the short term, at any rate — the temperature feedbacks that the IPCC imagines will greatly amplify any initial warming caused by CO2 are net - negative, attenuating the warming they are supposed to enhance.

The water vapor, lapse - rate and ice - albedo feedbacks in isolation enhance the global warming that would result from increasing CO2 concentrations alone to around +2.2 °C.

Climate models suggest that water vapour and snow cover, at least, are «positive feedbacks» and so should enhance the warming.

Warming phases were enhanced by carbon dioxide feedback loops.

In addition to direct MYI melt due to high - latitude warming, the impact of enhanced upper - ocean solar heating through numerous leads in decaying Arctic ice cover and consequent ice bottom melting has resulted in an accelerated rate of sea - ice retreat via a positive ice - albedo feedback mechanism.

They incorporate a wide range of additional feedbacks, some of which enhance and some of which reduce future emissions and resulting warming.

(While the data did suggest strong positive water vapor feedback, which enhances warming, that was far exceeded by the cooling effect of negative feedback from cloud changes.)»

In particular, she worries that climate models «involve a lot of theory and guesswork» about amplifying feedbacks that enhance the uncontested warming effect of CO2, which places her in the company of lukewarmists.

Since, obviously, CO2 is a greenhouse gas, we must conclude that the CO2 warming feedbacks are negating rather than enhancing the original CO2 warming.

Observations and model simulations suggest that even though global warming is set into motion by greenhouse gases that reduce OLR, it is ultimately sustained by the climate feedbacks that enhance ASR.»

That temp rise then causes something to outgas CO2 (possibly oceans, but maybe not) that then raises the temp even more (along with other GHG that feedback and enhance the warming), which causes more outgasing.

[The paper was] the first proper computation of global warming and stratospheric cooling from enhanced greenhouse gas concentrations, including atmospheric emission and water - vapour feedback.

«Stratospheric water vapor has a positive climate feedback effect: a warming climate increases stratospheric water vapor, and the increased stratospheric water vapor enhances surface warming.

In summer more sea ice melts, which leads to decreased albedo, a climate feedback that enhances the warming of both the open ocean water and the atmosphere directly above it.

TCADI simulations show enhanced warming due to greater sensitivity to CO2, aerosol effects, and greater methane feedbacks, and recovery is much slower in RCP2.6 than with the NINT and TCAD versions.

Emissions that, according to «global warming theory», are meant to effect the poles greater than mid latitude regions due to the lack of humidity enhancing the theorised CO2 feedback.

And these feedbacks are not properly described by models, because we don't understand how they work... Are they positive feedbacks that enhance the warming, or are they negative feedbacks that diminish the warming?

This north / south asymmetry has grown since perihelion was aligned with the winter solstice seven to eight centuries ago, and must cause enhanced year - on - year springtime melting of Arctic (but not Antarctic) ice and therefore feedback warming because increasing amounts of land and open sea are denuded of high - albedo ice and snow across boreal summer and into autumn.

In the idealised situation that the climate response to a doubling of atmospheric CO2 consisted of a uniform temperature change only, with no feedbacks operating (but allowing for the enhanced radiative cooling resulting from the temperature increase), the global warming from GCMs would be around 1.2 °C (Hansen et al., 1984; Bony et al., 2006).

In the papers, I was unable to find a single instance where any of the feedbacks thought to enhance warming in specific locations were associated solely with CO2.

The change appears to be driven largely by feedback - enhanced global climate warming, and there seem to be few, if any, processes or feedbacks within the Arctic system that are capable of altering the trajectory toward this «super interglacial» state.»

Matt Skaggs writes: «I have seen two spatial pattern claims about GHG warming, 1) the troposphere should warm more quickly, and 2) the poles should warm more quickly... I was unable to find a single instance where any of the feedbacks thought to enhance warming in specific locations were associated solely with CO2... I can not make the dots connect.»

Authors conclude from this and other evidence from process models that warmer climates may enhance tropical forest release of CO2, thus accelerating atmospheric CO2 accumulation through a positive feedback.

Where water vapor is important is as a feedback effect... whereby the warming of the atmosphere due to increased CO2 causes the «equilibrium» concentration of water vapor to increase and this then enhances the warming because of water vapor's absorption of infrared radiation.

Raper et al. (2001b) show that an additional ocean - feedback is possibly associated with the warming and freshening of the high latitude surface waters that enhances this relationship.

Given the role of warming in albedo change and the projections of increased warming and enhanced melting, future changes in the GrIS albedo will likely result largely from warming and associated feedbacks.