Sentences with phrase «year variability over»

Not exact matches

As we've demonstrated repeatedly, the valuation measures most strongly correlated with actual subsequent returns, particularly over a 7 - 15 year horizon, are those that normalize for profit margin variability in some way.

The variability of inflation has been a bit higher over the past 10 years than in the preceding decade.

I mean what we've learned over the last several years is that there's tremendous variability across the year, and so you had really strong sales results at Red Lobster first quarter last year, weak earnings results because of the variability in food costs.

By comparison, phenacosaur anoles living in cloud forests have had very little exposure to temperature variability for over 10 million years and are very much at risk from climate change, he said.

The scientists studied a marine sediment core off the coast of South Africa and reconstructed terrestrial climate variability over the last 100,000 years.

Researchers from the University of Southampton, the National Oceanography Centre and the Australian National University developed a new method for determining sea - level and deep - sea temperature variability over the past 5.3 million years.

Indeed, tree - ring chronologies provide much longer histories than observational records and corroborate that variability and synchrony have risen over the past hundred years, and to levels that are as high as any observed over the past three centuries, according to the researchers.

Over 10 years the scientists measured the amount of new growth (productivity) generated by all species in each plot, and the variability of that productivity (stability) from year to year.

Lead author of the study Dr David Reynolds, from the School of Earth and Ocean Sciences, said: «Our results show that solar variability and volcanic eruptions play a significant role in driving variability in the oceans over the past 1000 years.

However, declining human semen quality remains a controversial issue — many have criticised the variability of the data of the studies on the basis of changes in laboratory methods, training of laboratory personnel and improved quality control over the years.

«Interestingly, the effect of precipitation variability was amplified over the six years the experiment lasted and we still don't know its end point,» said Laureano Gherardi, a School of Life Sciences postdoctoral research associate and co-author of the paper.

We present tree ring — based reconstructions of central European summer precipitation and temperature variability over the past 2500 years.

«For various periods over the last 60 years, we have been able to combine important processes: atmospheric variability, such as the North Atlantic Oscillation, water and air temperatures, the occurrence of fresh surface water, and the duration of convection,» explains Dr. Marilena Oltmanns from GEOMAR, lead author of the study.

El Niño is a weather pattern characterized by a periodic fluctuation in sea surface temperature and air pressure in the Pacific Ocean, which causes climate variability over the course of years, sometimes even decades.

In fact, sample sex ratios collected for loggerhead turtles for more than 10 years in Palm Beach County, Fla. show significant variability, with highly female - biased ratios being produced over a wider range of temperatures than are found in many well - controlled laboratory studies.

«Based on the satellite data gathered, we can identify areas that, over the past 14 years, have shown high sensitivity to climate variability,» says researcher Alistair Seddon at the Department of Biology at the University of Bergen (UiB).

Using the 2m Faulkes Telescope North, we conducted a search for stars in M13 that show variability over a year (2005 — 2006) on timescales of days and months.

This is not very informative, because both the spatial and temporal variability is large, and any question of decline can only be correctly addressed using all the data together, and over a statistically significant time period (30 years or more would be preferred).

However, that dynamic variability is part of what makes one year so much colder than another, and the temperatures we were seeing over February and March suggested that this would be a bad year for ozone — despite the fact there was a rapid warming towards the end.

As the first mission to provide extensive time series measurements on thousands of stars over months to years at a level hitherto possible only for the Sun, the results from Kepler will vastly increase our knowledge of stellar variability for quiet solar - type stars.

«The reconstruction of past climate reveals that recent warming in the Arctic and in the Northern Hemisphere is highly inconsistent with natural climate variability over the last 2000 years.»

We're also learning that natural variability is really important when we're looking over time scales of anywhere from the next year or two to even a couple of decades in the future.

His research concerns understanding global climate and its variations using observations and covers the quasi biennial oscillation, Pacific decadal oscillation and the annular modes of the Arctic oscillation and the Antarctic oscillation, and the dominant spatial patterns in month - to - month and year - to - year climate variability, including the one through which El Niño phenomenon in the tropical Pacific influences climate over North America.

«Since the giant sodium nebula that they create varies over periods of months to years, the source of the variability is probably not the symmetrical sputtering cloud, but the streaming - wake source that waxes and wanes with volcanic activity on Io,» explained Jody Wilson, CSP senior research associate and a study co-author.

Aims: We aim to demonstrate the persistence of the phenomenon over time scales of a few years and to search for variability of our previously detected excesses.

Rowlands said: «One of the most noticeable features of the Welsh education system over recent years has been its variability.

Historical LIBOR shows borrowers and consumers the variability in rates over the years.

I started researching the process, and I got some crushing news: although I had over two years of employment history, the variability of my income meant I qualified for an extremely small loan amount.

Also for Florrie — here's the paper that found «17 years» needed — looking at several different data sets, figuring out how variable they are and so how many years you need to look at to drop out the natural variability, and see if there's a trend over time.

The trends over the last 30 years remain though the interannual variability is slightly reduced (as you'd expect).

By looking at the signatures of climate change in precipitation intensity and comparing that to the internal variability and the observation, the researchers conclude that the probability of intense precipitation on any given day has increased by 7 percent over the last 50 years — well outside the bounds of natural variability.

For instance, an influential analysis by Hawking & Sutton (2009)(link to figures) has suggested that internal climate variability account for only about 20 % of the variance over the British isles on a 50 - year time scale.

Thus it appears that, provided further satellite cloud data confirms the cosmic ray flux low cloud seeding hypothesis, and no other factors were involved over the past 150 years (e.g., variability of other cloud layers) then there is a potential for solar activity induced changes in cloudiness and irradiance to account for a significant part of the global warming experienced during the 20th century, with the possible exception of the last two decades.

They have not analyzed the first year of data yet, but in my lab we have looked at results from a similar set of moorings at 15N (Uwe Send's work) and find rather significant variability on weekly to monthly time scales (but no trend over the 4 years of data).

I don't think anyone denies that the sun matters for climate, but the question is whether the variability of the sun in recent history has had the impact that we project from greenhouse gases over the next 100 — and there, I think, a majority of your «AGW» ers» would think the evidence suggests that changes in human forcing will likely be several times (at least) larger than any solar variability we've seen in a thousand years or more.

Of course, on a timescale of one decade the noise in the temperature signal from internal variability and measurement uncertainty is quite large, so this might be hard to determine, though tamino showed that five year means show a monotonic increase over recent decades, and one might not unreasonably expect this to cease for a decade in a grand solar minimum scenario.

Is this because of a deficiency in CCSM4 or maybe because natural variability gave us a particularly steep decline in sea ice over the last 10 years?

However, atmospheric CO2 content plays an important internal feedback role.Orbital - scale variability in CO2 concentrations over the last several hundred thousand years covaries (Figure 5.3) with variability in proxy records including reconstructions of global ice volume (Lisiecki and Raymo, 2005), climatic conditions in central Asia (Prokopenko et al., 2006), tropical (Herbert et al., 2010) and Southern Ocean SST (Pahnke et al., 2003; Lang and Wolff, 2011), Antarctic temperature (Parrenin et al., 2013), deep - ocean temperature (Elder eld et al., 2010), biogeochemical conditions in the Northet al., 2008).

Over the last century, no single forcing agent is clearer than anthropogenic greenhouse gases, yet zooming into years or decades, modes of variability become the signal, not the noise.

With the anthropogenic perturbation likely to be around 2C and maybe more in the next 100 years (that's a global average, it will be much more over northern hemisphere land where we actually live), there are simply no comparable sources of natural variability, and the historical record shows that such temperatures have not been approached in the last 2000 years.

# 98 — ``... until the models have the ability to predict the short term variations occurring over the time interval of one year, we don't know how well the models have estimated natural variability.»

Two things have changed in recent years — first, the temperature changes over the historical period are now more persistent, and so the trend in relation to the year - to - year variability has become more significant (this is still true even if you think there has been a «hiatus»).

In so far as M&M are trying to distort the climate data over the last 1000 years to show that the so - called «Medieval Warm Period» replicates or exceeds the current warming — and so natural variability could possibly account for that warming — I thought it worthwhile to put out some information about Medieval climate.

captdallas2 — 24 Jan 2011 @ 12:34 PM «That would of course lead into a question of how over the period 1913 to 1940, though you could pick virtually any 27 year period, natural variability could create similar changes, but not so much now?»

A globally warm medieval period could be a simple forced response to increased solar, in which case it doesn't imply any larger intrinsic variability than already assumed, and since solar has been pretty much constant over the last 50 years, improvements to our understanding of solar forced climate changes are irrelevant for the last few decades.

A comprehensive new analysis of temperature changes over the continents through 2,000 years has found that a long slide in temperatures in most regions preceded the unusual global warming of recent decades, but with a lot of regional variability and other fascinating details.

However, in the paper the authors actually stated that «our conclusion about the dominance of the CRF over climate variability is valid only on multimillion - year time scales».

Many would think such a cooling outcome to be extremely unlikely (in the deep psyche impossible), but until the models have the ability to predict the short term variations occurring over the time interval of one year, we don't know how well the models have estimated natural variability.

The IPCC has therefore never tried to predict the climate evolution over 15 years, because that's just too much influenced by random internal variability (such as ENSO), which we can not predict (at least as yet).

The roughly thirty year period over which we have reliable reanalyses and satellite measurements is too short to rule out the influence of natural climate variability, such as the Pacific Decadal Oscillation.