Sentences with phrase «circulation patterns over»

A recent study on the North Pacific circulation patterns over the past 1.2 million years determined that sea ice on coastal areas can be an important factor in ocean circulation, therefore influencing climate at global and regional levels.

Also, recent research has tied 20th century temperature fluctuations in northern California, and much of the Pacific Northwest, to naturally occurring atmospheric / ocean circulation patterns over the Pacific Ocean.

This was said to be related to tighter circulation patterns over Antarctica, I think to do with the ozone hole.

This decade - scale shift in the atmospheric - circulation pattern over the North Atlantic, from the Azores to Greenland, strongly affects wintertime downwind.

Not exact matches

«These changes in large - scale circulation patterns during summer are especially pronounced over the Arctic and the North Atlantic.

Researchers from the University of California Irvine have shown that a phenomenon known as the Atlantic Multidecadal Oscillation (AMO)-- a natural pattern of variation in North Atlantic sea surface temperatures that switches between a positive and negative phase every 60 - 70 years — can affect an atmospheric circulation pattern, known as the North Atlantic Oscillation (NAO), that influences the temperature and precipitation over the Northern Hemisphere in winter.

For example, in Earth atmospheric circulation (such as Hadley cells) transport heat between the warmer equatorial regions to the cool polar regions and this circulation pattern not only determines the temperature distribution, but also sets which regions on Earth are dry or rainy and how clouds form over the planet.

The weather pattern over northern India, the Himalayas, and Pakistan is usually dominated by a circulation pattern that prevents mid-latitude weather systems from penetrating very far south.

«As the Arctic sea - ice cover continues to disappear and the snow cover melts ever earlier over vast regions of Eurasia and North America, it is expected that large - scale circulation patterns throughout the northern hemisphere will become increasingly influenced by Arctic Amplification.»

An INTAS - funded research project has been initiated to study the possible trends in snow cover during the last century over Northern Eurasia and the relation between snow cover variability and variations in atmospheric circulation patterns.

And given the fact that land warms more quickly than ocean, resulting in areas of low pressure over land, changing patterns of atmospheric and oceanic circulation are bringing them to the coasts — where so much life's diversity is found.

Last year the circulation pattern was such that a large trough over the eastern US enhanced the path of cyclones into Florida.

Warming is widespread over the upper layer of the ocean (500 meters or so), and this may change normal ocean circulation patterns, with unforeseen consequences.

There is also a natural variability of the climate system (about a zero reference point) that produces El Nino and La Nina effects arising from changes in ocean circulation patterns that can make the global temperature increase or decrease, over and above the global warming due to CO2.

For the entire Northern Hemisphere, there is evidence of an increase in both storm frequency and intensity during the cold season since 1950,1 with storm tracks having shifted slightly towards the poles.2, 3 Extremely heavy snowstorms increased in number during the last century in northern and eastern parts of the United States, but have been less frequent since 2000.11,15 Total seasonal snowfall has generally decreased in southern and some western areas, 16 increased in the northern Great Plains and Great Lakes region, 16,17 and not changed in other areas, such as the Sierra Nevada, although snow is melting earlier in the year and more precipitation is falling as rain versus snow.18 Very snowy winters have generally been decreasing in frequency in most regions over the last 10 to 20 years, although the Northeast has been seeing a normal number of such winters.19 Heavier - than - normal snowfalls recently observed in the Midwest and Northeast U.S. in some years, with little snow in other years, are consistent with indications of increased blocking (a large scale pressure pattern with little or no movement) of the wintertime circulation of the Northern Hemisphere.5 However, conclusions about trends in blocking have been found to depend on the method of analysis, 6 so the assessment and attribution of trends in blocking remains an active research area.

It is not surprising that there are many skeptics who like I am, are very knowledgeable in many of the over lapping fields, of gas chromatography, anthropology, radio graphics of X-ray and particle physics, biological plant and animal processes, agriculture, high power radio transmission and reception, and its attendant multiplexing of signals, mining, reforestation plans and progress realities, nuclear, gas, and coal power plant construction techniques, organic gardening, astronomy, stellar physics, global circulation pattern drivers, and have also spent considerable time out doors in a tent and sleeping bag.

The issue is that differences in mineral content, salinity, density, and temperature all affect how the ocean reacts to, and drives, changes in weather patterns, climate variations over years or decades, ocean current circulation, etc..

Circulation patterns could then move the warmth over land areas, she added.

According to their modeling studies, the difference in the amount of incoming solar radiation, in this case, primarily in the ultraviolet (UV) wavelengths, during the minima and maxima of the 11 - yr solar cycle are large enough to produce a characteristic change in the winter circulation pattern of the atmosphere over North America... When the NAO is in its negative phase, more cold air can seep south from the Arctic and impact the lower latitudes of Europe and the eastern U.S., which helps spin up winter storm systems.

The change in total solar irradiance over recent 11 - year sunspot cycles amounts to < 0.1 %, but greater changes at ultraviolet wavelengths may have substantial impacts on stratospheric ozone concentrations, thereby altering both stratospheric and tropospheric circulation patterns... This model prediction is supported by paleoclimatic proxy reconstructions over the past millennium.

«A research team... primarily made up of scientists from the U.K.'s Hadley Centre Met Office have identified a fairly strong solar signal in Northern Hemisphere winter circulation patterns which are manifest over Europe and the eastern United States.

A strong El Niño heats up the atmosphere and changes circulation patterns around the globe, especially the jet stream over the Pacific, which becomes stronger and dumps more frequent and intense storms over the western U.S., especially California.

By examining the spatial pattern of both types of climate variation, the scientists found that the anthropogenic global warming signal was relatively spatially uniform over the tropical oceans and thus would not have a large effect on the atmospheric circulation, whereas the PDO shift in the 1990s consisted of warming in the tropical west Pacific and cooling in the subtropical and east tropical Pacific, which would enhance the existing sea surface temperature difference and thus intensify the circulation.

But matters are greatly complicated by atmospheric circulation patterns, cyclic changes in temperatures over the oceans, and the shapes of land masses.

Petoukhov et al. (34) proposed a common mechanism for generating persistent high - amplitude quasibarotropic planetary - scale wave patterns of the NH midlatitude atmospheric circulation with zonal wave numbers m = 6, 7, and 8 that can explain a number of the major NH summer extremes over the 1980 — 2011 period (34, 35).

This year, more ozone has been lost over the Arctic due to unusually cold temperatures in the stratosphere, and these have been fed by a stronger circulation pattern called the polar vortex throughout the winter, according to Ross Salawitch, a professor at the University of Maryland, and one of Rex's collaborators.

They are being pushed out of the Arctic Ocean by a circulation pattern that starts over near Siberia; occasionally you'll see a Siberian tree washed ashore along this coast of Greenland.

The Walker circulation usually brings areas of high pressure to the western Indian Ocean but, in years when El Niño occurs, this pattern gets shifted eastward, bringing high pressure over India and suppressing the monsoon, especially in spring when the monsoon begins to develop.

A warmer stratosphere would in turn affect air circulation patterns that currently keep cold air trapped over the continent.

This report discusses our current understanding of the mechanisms that link declines in Arctic sea ice cover, loss of high - latitude snow cover, changes in Arctic - region energy fluxes, atmospheric circulation patterns, and the occurrence of extreme weather events; possible implications of more severe loss of summer Arctic sea ice upon weather patterns at lower latitudes; major gaps in our understanding, and observational and / or modeling efforts that are needed to fill those gaps; and current opportunities and limitations for using Arctic sea ice predictions to assess the risk of temperature / precipitation anomalies and extreme weather events over northern continents.

The North American Regional Reanalysis (NARR) displays a diurnal circulation pattern centered over Northern Texas that links together regional patterns in the diurnal cycles of assimilated precipitation.

The General Circulation Models (GCM) driving the regional models chosen are rated in the top 25 %, according to a performance evaluation of CMIP5 models carried out by Perez et al. (2014), in their ability to reproduce spatial patterns and climate variability over the north - east Atlantic region, that is the most influential on the European weather patterns.

What appears to be happening over the last 2000 yrs are changes to the circulation patterns in the oceans that appear to be cyclical in nature.

The weather pattern over northern India, the Himalayas, and Pakistan is usually dominated by a circulation pattern that prevents mid-latitude weather systems from penetrating very far south.

This circulation change results in more frequent episodes of blocking patterns that lead to increased cold surges over large parts of northern continents.

There is a similar patterns in over all global circulation as an over all 18.6 year and 18.03 year Saros cycle that shows up in the data.

It is further argued that the transition of vertical circulation patterns is in response to adjustments to geostrophic imbalance — an adjustment time scale of 6 — 9 h. Although unproven, we suggest that antecedent rainfall over the alkali desert 2 weeks prior to the event was instrumental in lowering the bulk density of sediments and thereby improved the chances for dust ablation by the atmospheric disturbance.

Many of these circulation patterns are thought to be driven by geographical features, such as the strong heating near the tropics nd over parts of the ocean basin, such as the Walker cell (see here).

But maps of sea level pressure can also be averaged over several months or years, to show the average circulation patterns in the atmosphere.

The models (and there are many) have numerous common behaviours — they all cool following a big volcanic eruption, like that at Mount Pinatubo in 1991; they all warm as levels of greenhouse gases are increased; they show the same relationships connecting water vapour and temperature that we see in observations; and they can quantify how the giant lakes left over from the Ice Age may have caused a rapid cooling across the North Atlantic as they drained and changed ocean circulation patterns.

Atmospheric circulation patterns interpreted for an early Silurian summer in the Northern Hemisphere indicate high pressure over the polar ocean with a zone of low pressure around 60 ° N latitude.