Sentences with phrase «data over the past century»

The available data over the past century can be interpreted within the framework of a variety of hypotheses as to cause and mechanisms for the measured changes.

Not exact matches

Over the past quarter century the level of the fed funds rate has explained nearly 50 % of the variation in stock / bond correlations, according to Bloomberg data.

If one excludes the 1980 - 1997 period, the historical correlation between 10 - year Treasury yields and 10 - year prospective (and actual realized) equity returns is actually slightly negative over the past century, and is only weakly positive in post-war data.

John R. Wilmoth, a demographer at the University of California, Berkeley, has collected a wealth of data on humankind's increasing longevity over the past two centuries.

Looking at data from 1855 through 2005, Webster and Holland found that the total number of tropical cyclones per year doubled in that time, from an average of six at the beginning of last century to 14 over the past decade.

The data reveal that the animals» numbers have plunged 95 percent over the past two centuries, coinciding with the arrival of settlers and the rapid clearing of forest habitats.

Rather than using complex computer models to estimate the effects of greenhouse - gas emissions, Lovejoy examines historical data to assess the competing hypothesis: that warming over the past century is due to natural long - term variations in temperature.

He also needed data representing a 100 percent human food diet, for which he turned to the Smithsonian Institution for samples of human hair from different periods over the past century.

They studied U.S. Department of Agriculture nutritional data from both 1950 and 1999 for 43 different vegetables and fruits, finding «reliable declines» in the amount of protein, calcium, phosphorus, iron, riboflavin (vitamin B2) and vitamin C over the past half century.

The data collected by observers over the past century allow researchers, conservation biologists and other interested individuals to study the long - term health and status of bird populations across North America.

All evidence of the big bang, this remarkable edifice of theory and observation that we built up over the past century, that has produced this cockamamy universe but one that we think we understand very well, all the data is consistent with a single picture of the universe.

But over the past half - century, researchers have developed a tool kit for estimating the toll, including household surveys, tallies of media reports of violence, and comparisons of census data before and after conflicts.

«Viewing the data on thousands of tornadoes that have been reliably recorded in the United States over the past half - century as a population has permitted us to ask new questions and discover new, important changes in outbreaks of these tornadoes,» Cohen said.

We used three independent and complementary sources of SST data to reveal global patterns of change in MHW frequency, intensity and duration over the past century.

In the paper Retreating Glacier Fronts on the Antarctic Peninsula over the Past Half - Century published this week in Science, we presented new data describing trends in 244 marine glacier fronts on the Antarctic Peninsula over the last 50 years.

We present photometric data covering more than a century and resulting in a long - term light curve that is densely sampled over the past five decades.

The progress in education data over the past two decades surpasses that made during the entire previous century.

Over the past quarter century the level of the e BoC overnight rate has explained nearly 29 % of the variation in stock / bond correlations, according to Bloomberg data.

Over the past quarter century the level of the fed funds rate has explained nearly 50 % of the variation in stock / bond correlations, according to Bloomberg data.

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.

The actual prevailing view of the paleoclimate research community that emerged during the early 1990s, when long - term proxy data became more widely available and it was possible to synthesize them into estimates of large - scale temperature changes in past centuries, was that the average temperature over the Northern Hemisphere varied by significantly less than 1 degree C in previous centuries (i.e., the variations in past centuries were small compared to the observed 20th century warming).

Inspection of the data reveal (not too surprisingly) large gaps is several areas of the oceans and I seriously doubt their conclusion that phytoplankton biomass declined by 40 % over the past century.

A region in the subpolar Atlantic has cooled over the past century — unique in the world for an area with reasonable data coverage (Fig. 1).

«Century of Data Shows Intensification of Water Cycle but No Increase in Storms or Floods Released: 3/15/2006 12:13:21 PM» (excerpt) A review of the findings from more than 100 peer - reviewed studies shows that although many aspects of the global water cycle have intensified, including precipitation and evaporation, this trend has not consistently resulted in an increase in the frequency or intensity of tropical storms or floods over the past cCentury of Data Shows Intensification of Water Cycle but No Increase in Storms or Floods Released: 3/15/2006 12:13:21 PM» (excerpt) A review of the findings from more than 100 peer - reviewed studies shows that although many aspects of the global water cycle have intensified, including precipitation and evaporation, this trend has not consistently resulted in an increase in the frequency or intensity of tropical storms or floods over the past centurycentury.

In short, an objective look at the data is equivocal at best as to the true trend in the tropical Pacific ocean - atmosphere system over the past century.

[ANDY REVKIN notes: One reason for the statistical gridlock is the murkiness of the data on the things that matter most (hurricane trends over the past century, for instance).

What is fairly hypocritical is to publicly claim that the data over the past few centuries is good enough to support this AMO explanation for hurricane activity, while at the same time claiming that the data is too poor to produce a statistically relevant trend over the past few decades.

The Carbon Dioxide Research Program of the U. S. Department of Energy and the National Climatic Data Center (NCDC) of the National Oceanic and Atmospheric Administration (NOAA) established a network of 1219 stations in the contiguous United States for the specific purpose of compiling a data set suitable for detecting and monitoring climate change over the past two centurData Center (NCDC) of the National Oceanic and Atmospheric Administration (NOAA) established a network of 1219 stations in the contiguous United States for the specific purpose of compiling a data set suitable for detecting and monitoring climate change over the past two centurdata set suitable for detecting and monitoring climate change over the past two centuries.

This winter anecdote is consistent with the hard data collected over the past century by the U.S. National Climatic Data Cendata collected over the past century by the U.S. National Climatic Data CenData Center.

A century of river flow records combined with an additional four to five centuries of tree - ring data show that the droughts over the past two decades were not unusual; longer and more severe droughts are a regular part of the climate variability in that part of the continent.

Specifically, smoothing sea - level data (adjusting for natural variability of ENSO) over the past century fits most closely with a 4th degree polynomial model, and there has very likely not been any slowing in the longer - term background rate of sea level rise over the period of the tropospheric «pause».

Jones et al., 2016 http://www.nature.com/nclimate/journal/v6/n10/full/nclimate3103.html «Most observed trends [over the 36 - year satellite data] are not unusual when compared with Antarctic palaeoclimate records of the past two centuries.

«We use geochemical data from a sediment core in the shallow - silled and intermittently dysoxic Kau Bay in Halmahera (Indonesia, lat 1 ° N, long 127.5 ° E) to reconstruct century - scale climate variability within the Western Pacific Warm Pool over the past ~ 3500 yr.

Some of this climate change may be due to the CO2 emitted to the atmosphere by the burning of fossil fuels over the past century, although an inspection of regional climate data shows most of the Sierra warming occurred from 1910 through the early 1930s, long before the major emissions.

The notion that over the longer timescales, forced responses dominated (at least for the second half of the past century) is reinforced by data on Ocean Heat Uptake since 1955.

Florida State University's James Elsner said ground data show every decade has been warmer than the last since the middle of the 20th century and satellite data - based observations «show continued warming over the past several decades.»

----- Maybe if we duplicate all the experiments over the past century and recollect all the data, drill new ice cores, etc., you think it would turn out different?

There are subtle differences in how they analyze temperature data, but there's generally broad agreement, particularly the upward trend in temperatures over the past century.

We have reasonably good data on the consumption of carbon - heavy fossil fuels over the past few centuries.»

Perhaps we should be less concerned with identifying trends over past centuries, where we are bound to have all kinds of data problems.

Based on these data, the 10 - year period, 1146 — 1155, was selected as a scenario of worst - case warm drought from the paleoclimate data for the past 12 centuries over the Southwest.

I have used a hybrid version of the Cowtan Way global temperature data set and it definitely shows a significant difference in warming in the Arctic region over the past quarter century when compared to other data sets and most climate models.

The data scientists are now studying reveal substantial evidence that on average Arctic temperatures in the winter have risen 11 degrees over the past 30 years, and in the late 20th century were the warmest in four centuries.

I can not say whether a close examination of that data set will lead to any material change in the view of temperature changes over the past century, but checking the dataset seems a worthwhile exercise.

The local bias in CO2 levels can be compensated for by calibrating the stomata data to direct measurements, firn and... ice cores over the past century.

That bias is taken into account by calibrating the stomata data against... ice cores over the past century.

A question that gets a lot of attention is whether you should try to tune your model to be consistent with the evolution of global mean temperatures (GMT) over the past century, or if you should withhold that particular iconic data set during model development, justifying its use as a measure of model quality.

Over the past 100 years there is a statistically significant upward trend in the data amounting to about 0.7 oC per century.

«The sum of the evidence against saturated fat over the past half - century amounts to this: the early trials condemning saturated fat were unsound; the epidemiological data showed no negative association; saturated fat's effect on LDL - cholesterol (when properly measured in subfractions) is neutral; and a significant body of clinical trials over the past decade has demonstrated the absence of any negative effect of saturated fat on heart disease, obesity, or diabetes.

For the record I think the clear trend from the published data is that the earth has warmed over the past century.