Sentences with phrase «atmospheric changes over»

Not exact matches

Venus's climate, like Earth's, has varied over time - the result of newly appreciated connections between geologic activity and atmospheric change

The greening of Sahara strengthens the West African Monsoon, which triggers a change in the atmospheric circulation over the entire tropics, affecting tropical cyclone activity.

«Using a numerical climate model we found that sulfate reductions over Europe between 1980 and 2005 could explain a significant fraction of the amplified warming in the Arctic region during that period due to changes in long - range transport, atmospheric winds and ocean currents.

By studying the chemistry of growth rings in the shells of the quahog clam, an international team led by experts from Cardiff University and Bangor University have pieced together the history of the North Atlantic Ocean over the past 1000 years and discovered how its role in driving the atmospheric climate has drastically changed.

The increased use of synthetic chemicals, including pesticides and pharmaceuticals to attack unwanted organisms, has outpaced the rates of change in rising atmospheric CO2 concentrations and other agents of global environmental change over the past 45 years, a new Duke - led analysis reveals.

From a quarter to half of Earth's vegetated lands has shown significant greening over the last 35 years largely due to rising levels of atmospheric carbon dioxide, according to a new study published in the journal Nature Climate Change on April 25.

«The change in flux described by our model happens over extremely long time periods, and it would be a mistake to think that these processes that are bringing about any of the atmospheric changes are occurring due to anthropomorphic climate change,» he said.

«The atmospheric carbon dioxide observations are important because they show the combined effect of ecological changes over large regions,» says Graven.

By analyzing boron in shells accumulated over more than 2 million years, Hönisch was able to reconstruct in unprecedented detail how atmospheric carbon dioxide levels have changed over time.

El Niño is a key factor in making hurricane seasonal forecasts because the changes in atmospheric patterns over the tropical Pacific that it ushers in have a domino effect on patterns over the Atlantic, tending to suppress hurricane formation.

These convection changes can in turn drive the formation of an atmospheric ridge in the North Pacific, resulting in significant drying over California.

A new analysis using changes in cloud cover over the tropical Indo - Pacific Ocean showed that a weakening of a major atmospheric circulation system over the last century is due, in part, to increased greenhouse gas emissions.

The soot from these fires and from automobiles and buses in the ever more crowded cities rises into the atmosphere and drifts out over the Indian Ocean, changing the atmospheric dynamics upon which the monsoons depend.

The researchers say that adding this atmospheric monitoring technique to the suite of tools used to monitor climate change can help to better understand greenhouse gas emissions from specific regions and how they are changing over time.

Because the new maps reveal microclimates and changes in the atmospheric water content over time, they may prove to be useful in the search for underground water.

They compared two simulations, present and future, of atmospheric rivers determined from the vertically integrated water vapor flux to quantify the changes in atmospheric rivers that make landfall over western North America.

The overall goal is to study how Mars loses its atmospheric gas to space, and the role this process has played in changing the Martian climate over time.

Given that atmospheric CO2 will likely continue to climb over the next century, a long - term increase in flowering activity may persist in some growth forms until checked by nutrient limitation or by climate change through rising temperatures, increasing drought frequency and / or increasing cloudiness and reduced insolation.

Human - caused climate change has been occurring over the last 200 yr, largely because of the combustion of fossil fuels and subsequent increase of atmospheric CO2.

Investigations of the properties of the water column in these seas have revealed a consistent trend of waning water column ventilation over time, probably because of changes in local atmospheric forcing.

Changes in atmospheric carbonyl sulfide over the last 54,000 years inferred from measurements in Antarctic ice cores, Journal of Geophysical Research: Atmospheres, 121, p. 1943 - 1954.

The patterns of salinity change can be used to infer changes in the Earth's hydrological cycle over the oceans (Wong et al., 1999; Curry et al., 2003) and are an important complement to atmospheric measurements.

This symposium brings together experts across disciplines to better understand how planets like Earth, Venus and Mars have changed over time — from their atmospheric composition, geology, chemical composition and interactions with the Sun — to help understand what it takes to support life and whether it could exist beyond our solar system.

-- THE POWER OF CONDITIONS: With every tarmac, mud, gravel, and dirt - covered surface utilizing LiveTrack 3.0 featuring dynamic time of day, seasonal changes, altering atmospheric conditions, and evolution over the course of a race weekend.

-- The Power of Conditions: With every tarmac, mud, gravel, and dirt - covered surface utilizing LiveTrack 3.0 featuring dynamic time of day, seasonal changes, altering atmospheric conditions, and evolution over the course of a race weekend.

The variations in natural and artificial light, atmospheric conditions, and chemicals create marbleized, reflective surfaces that take on the look of metal and that continue to oxidize, darken, and change color over time.

In addition to inviting contemporary artists to be involved in the project, historical representations of atmospheric conditions will be exhibited that illustrate how the idea of «air» has changed quite dramatically over the last few centuries.

In a series of papers, we've shown that the warmer temperatures observed over the WAIS are the result of those same atmospheric circulation changes, which are not related to the SAM, but rather to the remote forcing from changes in the tropical Pacific: changes in the character of ENSO (Steig et al., 2012; Ding et al., 2011; 2012).

The link between global temperature and rate of sea level change provides a brilliant opportunity for cross-validation of these two parameters over the last several millenia (one might add - in the relationship between atmospheric [CO2] and Earth temperature in the period before any significant human impact on [CO2]-RRB-.

Do you really think the fact that waters are warmer and atmospheric moisture content is higher now due to man - made global warming (not to mention the «blocking high» over Greenland due to Arctic climate change) may be less of an influence on Hurricane Sandy than some other currently unobserved changes to our climate that occurred 3000 years ago?

Re # 8, any changes in climate over glacial - interglacial timescales have to take into account an additional component: the biogeochemical cycling of atmospheric gases.

Meteorological scientists warn that the changes in heat composition and air pressure over the Tibetan Plateau may have implications beyond Asia's river basins, as shifting dynamics of the atmospheric circulatory system over the plateau could change wind and monsoon patterns across much of the world.

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.

That's why, over the long term, it is the atmospheric concentration of CO2 (which, by the way, is now hovering around 400 ppm) that will determine the severity of climate change.

Patterns of anomalously high sea levels are attributed to El Niño — related changes to atmospheric pressure over the Gulf of Mexico and eastern Canada and to the wind field over the Northeast U.S. continental shelf.

AFAIUI, the evidence we are talking about is a few occultation events over fifteen years that indicate changes in atmospheric pressure.

when for over 15 years those of us who follow atmospheric trends have been advocating no cost and negative cost policies to deal with the global climate change while the Embergers of the world have been playing grasshopper.

Haarsma et al. (2015) argue on the basis of model simulation that the weakening of the Gulf Stream system will in the future be the main cause of changes in the atmospheric summer circulation over Europe.

The constraining of the atmospheric model affect the predictions where there are no observations because most of the weather elements — except for precipitation — do not change abruptly over short distance (mathematically, we say that they are described by «spatially smooth and slowly changing functions»).

Once the ice reaches the equator, the equilibrium climate is significantly colder than what would initiate melting at the equator, but if CO2 from geologic emissions build up (they would, but very slowly — geochemical processes provide a negative feedback by changing atmospheric CO2 in response to climate changes, but this is generally very slow, and thus can not prevent faster changes from faster external forcings) enough, it can initiate melting — what happens then is a runaway in the opposite direction (until the ice is completely gone — the extreme warmth and CO2 amount at that point, combined with left - over glacial debris available for chemical weathering, will draw CO2 out of the atmosphere, possibly allowing some ice to return).

It presents a significant reinterpretation of the region's recent climate change origins, showing that atmospheric conditions have changed substantially over the last century, that these changes are not likely related to historical anthropogenic and natural radiative forcing, and that dynamical mechanisms of interannual and multidecadal temperature variability can also apply to observed century - long trends.

The rise of CO2 from 270ppm to now over 400ppm, the extent of equatorial and sub tropical deforestation, the soot deposits on the polar ice caps, the increase in atmospheric water vapour due to a corresponding increase in ocean temps and changes in ocean currents, the extreme ice albedo currently happening in the arctic etc, etc are all conspiring in tandem to alter the climate as we know it.

Thus, over thousands of years, there has been little change in atmospheric CO2 due to biosphere emissions.

The argument is then that the reason trends outside the Atlantic are weak is that they aren't being influenced by the AMO; the other explanation is that the other regions are already over the threshold, so that the Atlantic basin is more sensitive to changes in SSTs and atmospheric moisture than the other regions... or the data may be poor.

a) atmospheric CO2 from human activity is a major bause of observed warming in the 1980's and 1990's, c) that warming is overstated due to a number of factors including solar effects and measurement skew d) the data going back 150 years is of little reliability because it is clustered so heavily in northeast america and western europe rather than being global e) the global climate has been significantly shifting over the last thousand years, over the last ten thousand years, and over the last hundred thousand years; atmospheric CO2 levels did not drive those changes, and some of them were rapid.

All of this is reason for everyone and his brother, aunt and sister to greatly reduce their own GHG emissions, and to scream bloody murder till every corporation, institution and governmental body they have any influence over to immediately institute policies to rapidly bring down GHG emissions and look at reliable ways of drawing down atmospheric CO2 levels directly (especially replanting grasslands in the north, tree planting toward the equator where albedo change is not an issue).

1) It seems to me that the key mechanism for any impact must be the changes that increased arctic ocean temperatures will impose on the atmospheric circulation feature known as the Polar Cell, and via this on the Ferrel cell which sits over the mid latitudes.

If so, I think we want to include tightly coupled chemical and biological processes, in that case — for example, the chemical fate of atmospheric methane over time, the effects of increasing atmospheric CO2 on oceanic acid - base chemistry, and the response of the biological components of the carbon cycle to increased temperatures and a changing hydrologic cycle.

All that said, we can draw the conclusion that the theoretical effects of CO2 do in fact exist, they have been measured over a 10 cm path length, and from this we can extrapolate that a still higher sensitivity would be arrived at once the entire atmospheric scale and the change in water vapour concentration from bottom to top of that scale is taken into account.

As far as we know, the «airborne fraction» (percentage of emitted CO2 remaining atmospheric) has not been changing greatly over the past century, and if any change is occurring, the fraction is perhaps increasing very slightly due to greater saturation of the oceanic sink.