Sentences with phrase «poleward shifts of»

A wide range of other observations (such as reduced Arctic sea ice extent and increased ocean heat content) and indications from the natural world (such as poleward shifts of temperature - sensitive species of fish, mammals, insects, etc.) together provide incontrovertible evidence of planetary - scale warming.

According to the report, some of the small mammals have recently acquired new parasites, indicating poleward shifts of sub-Arctic faunas and increases in biodiversity.

At the same time, poleward shifts of westerly winds in the Southern Ocean reduced the region's ability to suck up CO2 as have mid-latitude droughts, which slowed the growth rate of forests and plants that capture carbon.

«Regardless of the cause,» the authors note, «the poleward shift of the jet streams and the associated subtropical dry zone, if it continues, could have important societal implications.»

For example, the Gulf of Mexico has an east - west coastline that prevents a northerly or poleward shift of species in response to warming ocean waters,.

This study found that associated with a poleward shift of the subtropical jet in the North Pacific basin, the number of atmospheric river days increases much more significantly in Alaska during spring because both increased moisture and increased wind speed gang up to increase the frequency of atmospheric rivers.

Both processes act to tighten the relation between subpolar surface heat flux variability and MOC - variability, resulting in a poleward shift of the latter.

A common change is a poleward shift of the extra-tropical storm track regions.

The poleward shift of the jets during a period of active sun was always inconsistent with AGW theory.

However, Yin (2005) studied the poleward shift of storm tracks PROJECTED to occur in the 21st century and contains no observational data.

Mechanistically, atmospheric heating from black carbon and tropospheric ozone has occurred at the mid-latitudes, generating a poleward shift of the tropospheric jet, thereby relocating the main division between tropical and temperate air masses.»

So the emphasis shifted to poleward shift of climate zones with particular emphasis on rain and desert belts moving such that agriculture is disrupted by great changes in precipitation patterns.

Ozone depletion in the late twentieth century was the primary driver of the observed poleward shift of the jet during summer, which has been linked to changes in tropospheric and surface temperatures, clouds and cloud radiative effects, and precipitation at both middle and low latitudes.

The poleward shift of high - altitude clouds affects how much sunlight reaches Earth's surface because when they move, they reveal what's below.

This shift is correlated with a poleward shift of the jet stream in the inter-model spread (R = 0.56).

What they discovered was that the poleward shift of the clouds, which occurs in both the Northern and Southern Hemispheres, connected more strongly with the expansion of the tropics, defined by the general circulation Hadley cell, than with the movement of the jets.

This is associated with a poleward shift of the westerlies at the surface (see Section 10.3.6) and in the upper troposphere particularly notable in the Southern Hemisphere (SH)(Stone and Fyfe, 2005), and increased relative angular momentum from stronger westerlies (Räisänen, 2003) and westerly momentum flux in the lower stratosphere particularly in the tropics and southern mid-latitudes (Watanabe et al., 2005).

Firstly, the intensification and poleward shift of the westerly wind causes a strengthening of the upper overturning circulation.

A poleward shift of the Hadley circulation by 5 degrees in two decades is not climate change?

The ozone hole indirect effect: cloud - radiative anomalies accompanying the poleward shift of the eddy - driven jet in the Southern Hemisphere.

The poleward shift of the Southern Hemisphere middle latitude jetstream in response to increasing carbon dioxide is one of the most robust circulation responses found in climate change experiments, and is predicted to occur during all seasons (IPCC, 2007c).

If surface temperatures were correlated positively with latitude, and temperature increased, one would expect a poleward shift of oceanic biota.

In particular, the forced poleward shift of the storm tracks is most significant over the North Atlantic, which highlights the importance of a regional perspective when considering Hadley Cell width variations.

Additionally, the intensified winds of the mid-latitude westerlies, and a poleward shift of the strongest winds toward the Antarctic Circumpolar Current will also lead to stronger convergence of surface currents, and stronger downward heat transport.

We found that relative to the global - mean trends of the respective layers, both hemispheres have experienced enhanced tropospheric warming and stratospheric cooling in the 15 to 45 ° latitude belt, which is a pattern indicative of a widening of the tropical circulation and a poleward shift of the tropospheric jet streams and their associated subtropical dry zones.

While the upper - troposphere tropical warming induces a poleward shift of the jet in winter, Arctic Amplification and a weaker stratospheric polar vortex result in the opposite effect.

Not exact matches

Climate changes that began ~ 17,700 years ago included a sudden poleward shift in westerly winds encircling Antarctica with corresponding changes in sea ice extent, ocean circulation, and ventilation of the deep ocean.

Those patterns matched three rather dire climate model predictions: that storm tracks — the paths along which cyclones travel in the Northern and Southern hemispheres — would shift poleward; that subtropical dry regions would expand, and that the tops of the highest clouds would get even higher.

«We estimate that the jet streams in both hemispheres have shifted poleward by roughly 1 degree latitude in both summer and winter seasons,» the researchers, led by Qiang Fu of the University of Washington, write in today's Science.

Researchers found that due to warming waters, the edge of the sharks» range could shift as much as 40 miles poleward per decade, pushing the sharks away from the warming oceans near the equator into different habitats.

Meanwhile, increasing temperature and ocean warming may lead to the reduction of diatom production as well as cell size, inducing poleward shifts in the biogeographic distribution of diatoms.

Performing a hybrid, finite - amplitude wave activity budget analysis they elucidated the nonlinear and irreversible aspects of wave interactions while the zonal wind adjusted toward a poleward - shifted state.

Despite large year - to - year variability of temperature, decadal averages reveal isotherms (lines of a given average temperature) moving poleward at a typical rate of the order of 100 km / decade in the past three decades [101], although the range shifts for specific species follow more complex patterns [102].

Wild species have responded to climate change, with three - quarters of marine species shifting their ranges poleward as much as 1000 km [44], [103] and more than half of terrestrial species shifting ranges poleward as much as 600 km and upward as much as 400 m [104].

«If a poleward displacement of the mid-latitude storm tracks also occurs, this will shift mid-latitude precipitation poleward, impacting regional agriculture, economy, and society.»

Here we are talking about modification of atmospheric circulation — poleward expansion of the dry, descending portion of the Hadley Cell circulation by a few degrees, associated shifts in the jet stream.

Other aspects of global warming's broad footprint on the world's ecosystems include changes in the abundance of more than 80 percent of the thousands of species included in population studies; major poleward shifts in living ranges as warm regions become hot, and cold regions become warmer; major increases (in the south) and decreases (in the north) of the abundance of plankton, which forms the critical base of the ocean's food chain; the transformation of previously innocuous insect species like the Aspen leaf miner into pests that have damaged millions of acres of forest; and an increase in the range and abundance of human pathogens like the cholera - causing bacteria Vibrio, the mosquito - borne dengue virus, and the ticks that carry Lyme disease - causing bacteria.

Indeed that poleward shift was supposed to be accompanied by a tropospheric hot spot as the enhanced upward energy flux was then constrained by extra GHGs so that the «surplus» energy was retained in the troposphere and thereby denied to the stratosphere which then cooled as per observations and despite the «normal» warming of the stratosphere that would otherwise have been expected from the highly active sun at the time.

The authors find that, globally, the latitudes of maximum intensity have shifted poleward, 53 kilometres per decade in the Northern Hemisphere and 62 kilometres per decade in the Southern Hemisphere.

Current work1 has provided evidence of the increase in frequency and intensity of winter storms, with the storm tracks shifting poleward, 2,3 but some areas have experienced a decrease in winter storm frequency.4 Although there are some indications of increased blocking (a large - scale pressure pattern with little or no movement) of the wintertime circulation of the Northern Hemisphere, 5 the assessment and attribution of trends in blocking remain an active research area.6 Some recent research has provided insight into the connection of global warming to tornadoes and severe thunderstorms.7, 8

The current study support previous findings which found that accelerated subtropical warming of the troposphere could shift the paths of rain and snow storms poleward.

Landmark studies included Parmesan (1996), finding a latitude shift attributed to climate change in a North American butterfly (Edith's Checkerspot, photo (c) 2004 Jeffrey Pippen, by permission), and Parmesan et al. (1999) with «the first large - scale evidence of poleward shifts in entire species» ranges» from Europe.

Reading your previous post about the westerlies shifting poleward made me think of something.

For example, one of the clearest predicted ecological impacts of climate is a poleward shift in the ranges of plant and animal species.

Direct effects of increasing temperature on marine and freshwater ecosystems are already evident, with rapid poleward shifts in regions, such as the north - east Atlantic, where temperature change has been rapid (see Chapter 1).

Wild species have responded to climate change, with three - quarters of marine species shifting their ranges poleward as much as 1000 km [44], [103] and more than half of terrestrial species shifting ranges poleward as much as 600 km and upward as much as 400 m [104].

Despite large year - to - year variability of temperature, decadal averages reveal isotherms (lines of a given average temperature) moving poleward at a typical rate of the order of 100 km / decade in the past three decades [101], although the range shifts for specific species follow more complex patterns [102].

There has been a poleward shift and intensification of the mid-latitude depressions in the North Atlantic from the 1950s to the early 2000s, which is linked to a poleward shift in Northern Hemisphere jet streams.

The large scale atmospheric circulation «cells» shift polewards in warmer periods (for example, interglacials compared to glacials), but remain largely constant as they are, fundamentally, a property of the Earth's size, rotation rate, heating and atmospheric depth, all of which change little.

Observational and numerical evidence of a poleward shift in the Southern Hemisphere middle latitude jetstream (a positive trend in the Southern Annular mode) in response to Antarctic ozone depletion (Gillett and Thompson, 2003; Arblaster and Meehl, 2006; Son et al., 2010; Polvani et al., 2011; McLandress et al., 2011; Thompson et al., 2011).