Sentences with phrase «high northern latitudes]»

See K. R. Briffa, F. H. Schweingruber, P. D. Jones, T. J. Osborn1, S. G. Shiyatov & E. A. Vaganov, «Reduced sensitivity of recent tree - growth to temperature at high northern latitudes», Nature 391, 678 - 682 (12 February 1998).

However, the plots also reveal some substantial differences at a regional level, notably over the North Atlantic Ocean, the sub-tropical Atlantic and Pacific Oceans in the SH, and at high northern latitudes during June to August.

In mid to high Northern latitudes on a still winter's day one may see a hollow entirely covered in dew.

Warming is especially pronounced in high northern - latitude regions in the boreal winter and in southern Europe and parts of central and northern Asia in the boreal summer.

The research shows that recovery takes longest in the tropics and high northern latitudes, especially in the Russian Far East and Alaska, and that drought impacts increased throughout the 20th century.

These tectonic events led to changes in the circulation of the oceans and the atmosphere, which in turn fostered the development of persistent ice at high northern latitudes.

The other reason is that temperature changes are more dramatic in high latitudes than the global average, especially high northern latitudes.

You can show that if the transmission decayed exponentially, as it would if the absorption factor were independent of wavelength, then doubling CO2 would warm the Earth by about 50 degrees C instead of 2 to 4 degrees (which is plenty bad enough, once you factor in that warming is greater over land vs. ocean and at high Northern latitudes).

Most of the warming was in the high northern latitudes with little warming in the tropics.

During DJF, high northern latitude land areas, Mexico and parts of northern Africa are identified.

Models are known to have large biases in snow and ice cover over high northern latitudes [16].

The magnitude and inter-model range of simulated warming over high northern latitudes are very similar in the high - end and non-high-end models, which indicates that the biases among the models are larger than the climate change signal.

Many aspects of a temperature increase would probably be welcome at high northern latitudes that are now too cold over much of the year.

«The Milankovitch theory of climate change proposes that glacial - interglacial cycles are driven by changes in summer insolation at high northern latitudes [i.e., solar irradiance received].

Our ability to place the recent temperature increase in a longer paleoclimate perspective is also hampered by an apparent change in the sensitivity of recent tree - growth to temperature at high northern latitudes where trends in TRW and MXD have been reported to increasingly diverge from the instrumental records during the second half of the twentieth century (Jacoby and D'Arrigo 1995; Briffa et al. 1998a, b; D'Arrigo et al. 2007).

When I look at global temperature anomaly maps put out by NASA, I see that the most dramatic warming is occurring in the high northern latitudes (in places like Alaska, Siberia, and Greenland).

Much of the warming seen during DJF over high northern latitudes is strongly controlled by each model's simulation of ice and snow cover during the preindustrial period, and how they respond to a warming climate.

Only a strong reduction in summer insolation at high northern latitudes, along with associated feedbacks, can end the current interglacial.

We conclude, therefore, that evolution of GEM concentrations reconstructed above Greenland can not be generalized to the whole Northern Hemisphere, but is instead likely to be representative of middle and high northern latitudes.

In this paper, we present results from a natural archive that provides a unique history of gaseous elemental mercury concentrations at middle and high northern latitudes.

However, both sediment records of atmospheric deposition of Hg2 + species at high northern latitudes and atmospheric GEM concentrations inferred from Greenland firn air support the conclusion that transfer of anthropogenic inorganic mercury through the atmosphere to terrestrial and marine reservoirs occurs on a large scale.

Firstly, we are seeing a considerable increase in the reduction of spring snow - cover i.e. an earlier melt - out over high northern latitudes.

For example, atmospheric GCM simulations driven by reconstructed SSTs from the Pliocene Research Interpretations and Synoptic Mapping Group (Dowsett et al., 1996; Dowsett et al., 2005) produced winter surface air temperature warming of 10 °C to 20 °C at high northern latitudes with 5 °C to 10 °C increases over the northern North Atlantic (~ 60 ° N), whereas there was essentially no tropical surface air temperature change (or even slight cooling)(Chandler et al., 1994; Sloan et al., 1996; Haywood et al., 2000, Jiang et al., 2005).

It's albedo change from increased autumnal snow cover at high northern latitudes.

If ECS is 2C, or even only 1C, given humans are going to more than double equivalent CO2, how can the CET, being fairly high northern latitude, not end up warming several degrees due to man?

Clark & Huybers [76] fit a polynomial to proxy temperatures for the Eemian, finding warming as much as +5 °C at high northern latitudes but global warming of +1.7 °C «relative to the present interglacial before industrialization».

In the interest of full disclosure, my «sense» is that such a small temperature increase would not increase water vapor significantly enough to cause a statistically significant increase in numbers and / or severity of extreme events, especially since most of the warming has reportedly been in the high northern latitudes where temperatures are well below 0C where the water vapor saturation value vs temperature curve is pretty flat.

GMT drops initially at glacial inception in response to decreased summer radiation at high northern latitudes that would have led to equatorward extension of sea ice and snow cover with associated cooling from increased albedo.

The warm period in recent years differs qualitatively from the earlier warm period centered around 1940; the earlier warming was focused at high northern latitudes, while the recent warming is more global.»

Such a strong acceleration of methane degassing from the Arctic would result in measurably higher concentrations of methane in the high northern latitudes.

One possible explanation for the Younger Dryas is freshwater melt inflow — AMOC won't stop entirely but the associated high northern cooling brings with it ice sheet growth and sea level falls.

Well, here's a link that shows (or purports to show) that the vast majority of global warming in the past few decades has taken place in very high Northern latitudes — well North of anyplace with significant population.

Reduced sensitivity of recent tree - growth to temperature at high northern latitudes.

Their study, also reported in The Cryosphere, included the mid-Holocene period about 6,000 years ago, when summer temperatures at high northern latitudes were 2 - 3 °C warmer than today.

The main reason for this warmer climate was an increased amount of energy from the Sun being received at high northern latitudes due to Earth's orbital configuration, plus Earth had an increased capacity to absorb heat due to vegetation changes and reduced ice and snow cover.

In the first case, an ECS of 8 K / 2xCO2 is too high... obvious to me because I know that I didn't take methane into account, which is a significant contributor, nor ice albedo feedback as a function of high northern latitude insolation cycles a la Milankovitch.

Be CSI an omission or not, examination of those graphics suggests the size of the CSI effect AD1000 to AD2000 amounts to +2 Wm ^ -2 insolation (+0.002 Wm ^ -2 / year) over high northern latitudes during the merry months of April & May and -2 Wm ^ -2 insolation -LRB--0.002 Wm ^ -2 / year) over higher northern latitudes during the jolly months of July & August.

In the case of the 100 kyr ice age cycles, that forcing is high northern latitude summer insolation driven by predictable changes in Earth's orbital and rotational parameters — aka, Milankovitch theory — which has the intial effect of melting glaciers, thereby reducing albedo at those latitudes.

Note in panel (a) solar forcing that, aside from the high northern latitudes, the most warming also occurs in the tropics between 200 - 300 hPa, but that unlike in panel (c) well - mixed greenhouse gasses that the warming goes all the way to TOA.

Glacials happen when the 100,000 year Milankovitch orbital cycle is such that summer irradiance in high northern latitudes is at its lowest point — allowing the persistence of ice fields.

The greatest rises in regional temperatures (and temperature variability) being at high northern latitudes (Liu et al. 2007; Wu et al. 2011).»

It will without doubt have come to your Lordship's knowledge that a considerable change of climate inexplicable at present to us must have taken place in the Circumpolar Regions, by which the severity of the cold that has for centuries past inclosed (sic) the seas in the high northern latitudes in an impenetrable barrier of ice has been during the last two years greatly abated.

In warm periods such as the present — freshwater inflow to high northern latitudes reduces the rate of water sinking to the depths of the ocean.

In this article I present prima facie evidence that the ongoing natural increase in spring insolation occurring at high northern latitudes, coupled with the positive feedback effect of the resultant snow and ice loss reducing the region's mean albedo over summer, comprises just such a causative agency.

Reduced sensitivity of recent tree growth to temperature at high northern latitudes.

Models show that the southern westerlies alone are sufficient to start a conveyor running; what's added up in the far north (and in the narrow North Atlantic alone) is a highly efficient return loop of sinking water at high northern altitudes.

Although there is less warming at low latitudes than at high northern latitudes, there is also less internal variability at low latitudes, which results in a greater separation of the climate simulations with and without anthropogenic forcings.

The overturning circulation pushes water through the Atlantic Basin, distributing heat as it moves warmer surface water from the tropics toward Greenland and the high northern latitudes and carries colder, deeper water from the North Atlantic southward.

As for the facts concerning temperature development in the high northern hemisphere, the over-proportional rise in the wider polar region is well established and undisputed.

And if you look at zonal temperature records (ie GISTemp below), the place with the big temperature during the early 20th century was the high northern latutudes that do conveniently have ample ice to melt.