Sentences with phrase «temperature variation»

The Atlantic Ocean thermohaline circulation multi-decadal variability is suggested as a major cause of Arctic temperature variation.»

In order to make a comparison, I will introduce the other extreme position that the amplitude of the TOA noise flux is the exclusive source of natural global temperature variation.

Historically, today's temperature trends are entirely within in the realm of what has taken place in the past from natural temperature variation, regardless of CO2 levels.

This is a natural phenomenon — is the most significant source of surface temperature variation and is not an artifact of AGW.

Using advanced statistical techniques, Ludecke et al. concluded that global temperature variation has causes related to both anthropogenic and natural reasons.

As implied by the noted temperature variation, this positive phase was prevalent from the late 1970s through the 1990s.

What the BEST researchers did not determine is the cause of the warming - is temperature variation anthropogenic or natural?

Another really key thing regarding Bristlecone sites is that the amount of daily, day to day and annual temperature variation is extreme, possibly near or at the most extreme levels found anywhere in the world.

The full range of global mean temperature variation during the last 1000 years — which has seen the coming and going of a Little Ice Age — is only about one degree C.

Minnett & Kaiser - Weiss GHRSST 12 - Jan - 2012 has a graph of ocean skin temperature variation.

Hence a mantle movement of 2 m, even if vertical, could not explain a temperature variation during a century of more than 1 millikelvin.

Diurnal temperature variation exceeds the 0.74 C twentieth century warming trend by orders of magnitude, but these variations obviously even out over long intervals.

ENSO is the major driver by far of global surface temperature variation.

Any temperature variation between 1900 and 2000 would therefore have to be explained by a mantle movement of 2 m.

The model simulation generally captured the temperature variation on the decade to century timescale

That something was significant, since the Science paper's Supplementary Information discussion said it did not enable discriminating such a temperature variation (i.e. a «blade») on such a short a time scale.

Not only does Callendar not say «that the CO2 variation should explain all of the temperature variation», nobody says that!

The same temperature variation that occurs....

Other climate simulations that use sea surface temperature variation didn't match observed changes, either.

Story submitted by Cornelis de Jager (past president ICSU; past pres. COSPAR) In a recent publication entitled Terrestrial ground temperature variation in relation to solar magnetic variability, including the present Schwabe cycle, Cornelis (Kees) de Jager and Hans Nieuwenhuijzen, from the Space Research Organisation of the Netherlands have analysed the dependence of the global earth temperature...

First of all, if one examines the complete geological record of global temperature variation on planet Earth (as best as we can reconstruct it) not just over the last 200 years but over the last 25 million years, over the last billion years — one learns that there is absolutely nothing remarkable about today's temperatures!

But responses to seasonal temperature variation still vary among arthropod groups.

Is this current warming part of the Earth's natural temperature variation?

It is better to say the anomaly is the average temperature DIFFERENCE, not the temperature variation.

A continuous model of temperature variation was used to predict the thermal response of the Earth's surface to changes bounded by δρ = δγ and δρ = − δγ.

My understanding is that an Anomaly is the average temperature variation over a period relative to a baseline, if the temperature is greater it results in a positive anomaly, if it is equal to the baseline then there is zero anomaly and if it is less than the base line it is a negative anomaly.

How do you allow for temperature variation with altitude.

(Top) Records of Northern Hemisphere temperature variation during the last 1300 years with 12 reconstructions using multiple climate proxy records shown in colour and instrumental records shown in black.

So I thought they were being really clever by making a valid correlation of SOI with temperature variability, then subtly changing the language to temperature variation.

Based on the GISP2 ice core proxy record from Greenland it has previously been pointed out that the present period of warming since 1850 to a high degree may be explained by a natural c. 1100 yr periodic temperature variation (Humlum et al., 2011).

Generally, water infiltration notwithstanding, annual temperature variation ceases at about 1 meter in depth and the geothermal gradient of 22C / km begins.

When Mike began working with Ray Bradley, he was interested in reconstructing the patterns of temperature variation in a way that would provide insight into the workings of the climate system.

I am following this discussion with interest, since the question of whether the last 30 years or so represent an unprecedented temperature variation is a critical one for AGW.

But if the optical thickness in that band is sufficiently smaller than in another band (depending on wavelengths), adding some absorption to the optically - thinner band would tend to result in warming of the colder layers (as there would be less temperature variation over height in radiative equilbrium for that band, given the same surface (+ tropospheric) temperatures.

(and not allowing surface temperature variation to increase so much that the average temperature drops significantly relative to global average OLR)

This is really a transport process, heat flows throughout the atmosphere but without temperature variation.

Generally, absorption lines in the absence of any line - broadenning, would absorb over an infinitesimal portion of the spectrum, and saturate (ie reduce the photon travel distances to a scale where there is very little temperature variation) relatively more quickly.

Keeping within a sufficiently small range of wavelengths that the effects discussed in 438 can be set aside, What such band widenning would do, without a surface temperature increase, is simply increase the range of wavelengths at which the same temperature variation accomplishes the same spectral fluxes through the band, thus not changing OLR within the band — the warming that results from such band - widenning should thus tend to increase the OLR within the band.

But when optical thickness gets to a significant value (such that the overall spatial temperature variation occurs on a spatial scale comparable to a unit of optical thickness), each successive increment tends to have a smaller effect — when optical thickness is very large relative to the spatial scale of temperature variation, the flux at some location approaches the blackbody value for the temperature at that location, because the distances photons can travel from where they are emitted becomes so small that everything «within view» becomes nearly isothermal.

(a condition which tends to be satisfied for a doubling of CO2, unless the temperature variation is sufficiently compressed toward L, analogous the cases discussed in 15.3 a with c larger than 1 except for the nonlinear relationship between the intensity or flux and the BT — and preexisting non-CO2 CDS will actually make it harder for ΔBTc0 to be larger relative to BTc0i),

Including emission along a path (Schwarzchild's equation), a flux will approach saturation as the optical thickness becomes large over scales where the temperature variation is small; at smaller optical thicknesses, the temperature distribution may vary and larger temperature variations make the nonlinearity of the Planck function important, but over short distances, the temperature variation can be approximated as linear and the associated Planck function values can be approximated as linearly proportional to distance for small temperature changes, so the flux will approach an asymptotic value as a hyperbolic function (the difference between the flux and the saturation value of the flux will be proportional to 1 / optical thickness per unit distance (assuming isotropic optical properties (or even somewhat anisotropic properties), it will have that proportionality for all directions and thus for the whole flux across an area).

How many records being broken on a daily basis, in temperature variation, increasing flooding, droughts, hurricanes, fires, etc....

The researchers also made measurements of seasonal water temperature variation and the ability of the sediment to conduct heat, which they used to create a model of the study area.

Here a reaction on the main points about the natural (solar, volcanic) vs. man - made (GHGs, aerosols) sensitivity: — If there was a larger temperature variation in the past millennium, the mathematical evidence is that an increase of one of the terms of the temperature trend equation must go at the cost of one or more other terms of the equation.

Consider any preexisting (baseline) CSD (of the absorbing / emitting type) that exists at some frequency, with some temperature variation over vertical distance.

Its more difficult to see how it is eliminated however for the boreal treeline case, where the scale of temperature variation is the synoptic scale, and nearby cross-dating along a sharp temperature gradient is not possible.

For CO2, that's about 12K per kilometer for 1 Earth g. Therefore, to get the desired temperature variation over 2m, you'd need a centrifuge that got you up to about 500 Earth g's.

1 Watt / meter squared TOA variation in TSI during a solar ~ 11 year cycle «may» contribute 0.1 degree temperature variation.

But changes in these levels might well be responses to other factors rather than being cause of the temperature variation.

As a rough estimate, let's say we want a 10K temperature variation from the dry adiabatic lapse rate in a 2m column.