Sentences with phrase «on ancient climate»

Sediment core samples drawn from Lake Titicaca, South America's largest freshwater lake, have revealed a 25,000 - year precipitation record that may rewrite the books on ancient climate.

And a fourth study in the same issue of Nature, this one focusing on ancient climate, also makes the case for an earlier exodus.

Human activities are releasing greenhouse gases more than 30 times faster than the rate of emissions that triggered a period of extreme global warming in the Earth's past, according to an expert on ancient climates.

These days when one goes to hear a talk on ancient climates of North America, one is likely to learn that the speaker was forced into early retirement from the U.S. Geological Survey by budget cuts.

Not exact matches

Turning cities into sponges: how Chinese ancient wisdom is taking on climate change The Guardian

She is also a vice chair of the All - Party Parliamentary Group on Climate Change and chair of the APPG on Ancient Woodland.

With this compelling demonstration of using ancient soil samples as proxies for regional climate in Asia, Caves now plans to extend his investigations elsewhere on the globe.

The influence of climate on agriculture is believed to be a key factor in the rise and fall of societies in the Ancient Near East.

Using an interdisciplinary approach that combined evidence from climate modelling of large 20th - century eruptions, annual measurements of Nile summer flood heights from the Islamic Nilometer — the longest - known human record of environmental variability — between 622 and 1902, as well as descriptions of Nile flood quality in ancient papyri and inscriptions from the Ptolemaic era, the authors show how large volcanic eruptions impacted on Nile river flow, reducing the height of the agriculturally - critical summer flood.

A new study linking paleoclimatology — the reconstruction of past global climates — with historical analysis by researchers at Yale and other institutions shows a link between environmental stress and its impact on the economy, political stability, and war - fighting capacity of ancient Egypt.

«The Gondwanides not only influenced how and where rivers flowed (depositing sediment), it also had a significant effect on the climate, and thus the ancient fauna of the Karoo Basin,» says Viglietti.

The findings are based on analyses of ancient plant leaf wax found in the sediments of the Gulf of Guinea in combination with computer models of the climate system.

Ancient clams on the shores of Peru have revealed a new history of Earth's most important and unpredictable climate phenomenon.

«Ice cave in Transylvania yields window into region's past: Scientists conduct ancient climate research on oldest cave glacier in the world.»

Evidence based on ancient DNA samples and historical climate patterns has suggested that the recurrent outbreaks of the second pandemic were caused by multiple reintroductions of Yersinia pestis into Europe, most likely from Asia.

«Ancient marine algae provides clues of climate change impact on today's microscopic ocean organisms.»

Molecular signatures in ancient rocks show the microorganisms may have existed on Earth around 3.5 billion years ago, producing some of the greenhouse gases needed to stabilise the early Earth's climate.

Extensive systems of fossilised riverbeds have been discovered on an ancient region of the Martian surface, supporting the idea that the now cold and dry Red Planet had a warm and wet climate about 4 billion years ago, according to UCL - led research.

This study therefore shows that climate warming is not the only explanation of global ecological disasters in the past on Earth: it is important to continue analysing ancient marine sediments to gain a deeper understanding of the earth's climate system.

A new study published in Scientific Reports finds that bandicoots are not only more ancient than anyone thought, they're probably no strangers to the pressures and shifts brought on by climate change.

Boulders deposited by an ancient glacier that once covered the summit of Mauna Kea on the island of Hawaii are providing clues to past climate changes on Earth.

Dr. Beth Shapiro, whose work focuses on how populations of organisms respond to climate and habitat change over time, has isolated ancient DNA from a variety of Pleistocene and Holocene species.

The interesting sidelight on that discovery is the ancient climate was quite different as well.

He explains how he once thought that climate change theory was based solely on computer models, where in fact it's based on scientific measurements of both modern and ancient climates.

So GISS climate modeler Michael Way took a topographic map of Venus based on findings from another mission, filled in the lowlands with an ocean of water, and ran the global climate model to simulate the climate of ancient days on Venus.

For example, if tribes migrate (d) to a certain locale or are forced out of an ideal way of life due to cataclysm etc, (such as leaving fruit bearing tropical climates due to sea level rise in ancient prehistory as seen from underwater megalithic stone temples from around the world) then that does nt mean their way of life currently is the most ideal that the body thrives on, such as «paleo» diet or atkins diet or other FAD BULLSHIT low carb, high fat diets that are EXTREMELY HARMFUL AS CITED CONCLUSIVELY.

The diet of both ancient and contemporary hunter - gatherer tribes depended / depend on several factors such as geographical location, season, climate, etc., and nutrient intake therefore varied / vary considerably between different tribes.

Recommended for its lovely warm climate during the winter months, the Financial Express described Belize as a small country full of amazing attractions, including bird watching, exploring ancient Maya ruins, and snorkeling and scuba diving on its pristine barrier reef.

Excerpts from: Ancient Climate Studies Suggest Earth On Fast Track To Global Warming, Santa Cruz CA (SPX), Feb 16, 2006

Dr. Zbigniew Jaworowski — world - renowned expert on the ancient ice cores used in climate research — says the U.N. «based its global - warming hypothesis on arbitrary assumptions and these assumptions, it is now clear, are false.»

The $ 200,000 Tyler Prize for 2009, one of the top awards for environmental achievement, will be shared by Richard Alley, who has spent decades probing the planet's ancient ice for climate clues, and Veerabhadran «Ram» Ramanathan, an atmospheric scientist whose focus has been the substantial influence of sooty pollution on climate and health in South Asia.

Ancient Climate Studies Suggest Earth On Fast Track To Global Warming by Staff Writers Santa Cruz CA (SPX) Feb 16, 2006

It features some of the most dramatic and rapid climate shifts in Earth's history, as well as tenacious scientists braving the hostile ice and snows of Greenland and Antarctica for years on end to bring home that most precious material: kilometre - long cores of ancient ice, dating back over a hundred thousand years.

Jeff Nichols, a historian and graduate student at the University of Chicago, has done a remarkable amount of archive sleuthing and tweeted an astounding string of ancient stories on coal, carbon dioxide and climate on Twitter.

Ironic, isn't it, that if we'd had a climate bill like this ten years ago, we'd be more secure today: less reliant on that expensive and mostly foreign ancient black goo.

Meanwhile important news came from studies of ancient climates recorded in Antarctic ice cores, retrieved by a French and Russian team from one of the most inhospitable places on Earth.

Posted in Advocacy, Climatic Changes in Himalayas, Disaster and Emergency, Disasters and Climate Change, Ecosystem Functions, Flood, Governance, Government Policies, Migration, News, Population Comments Off on Ancient Waterways Bend To Climate Change

The identified atmospheric feedbacks including changes in planetary albedo, in water vapour distribution and in meridional latent heat transport are all poorly represented in zonal energy balance model as the one used in [7] whereas they appear to be of primary importance when focusing on ancient greenhouse climates.

This work has also been a benchmark for understanding Mars» past and present climate, and is essential in determining whether or not life was possible on ancient Mars.

In a similar vein, the ancient Norse — drawing, perhaps, on some racial memory of climate change in the prehistoric past — insisted in their eschatology that the end of the world (Ragnarok, marked by warring among gods and men and great natural disasters) would be preceded by three great winters or «fimbulwinters.»

Ancient trees reveal that the El Niño and La Niña events that wreak havoc on climate worldwide have been even more extreme than anyone knew, a revelation that suggests wilder swings in the future as the world gets warmer.

The results also show these ancient lakes actually have a net cooling effect on climate over thousands of years.

The IntCal13 calibration curve is not related to climate or solar activity, and is based on the amount of ¹⁴ C found at each tree ring (or speleothem growth) with the goal of being able to date ancient biological materials.

This paper tests whether one or both of these seemingly competing perspectives can be empirically supported through an examination of the diachronic impact of climate - related disasters on ancient societies.

This portion of the book offers a great deal of information on «paleoclimatology» (the study of ancient climate states.)

Chapter 5 of «AR5» describes work examining ancient climates on Earth, and the lessons that they hold for us today — and particularly work carried out since the last Assessment Report in 2007.

1950s: Research on military applications of radar and infrared radiation promotes advances in radiative transfer theory and measurements = > Radiation math — Studies conducted largely for military applications give accurate values of infrared absorption by gases = > CO2 greenhouse — Nuclear physicists and chemists develop Carbon - 14 analysis, useful for dating ancient climate changes = > Carbon dates, for detecting carbon from fossil fuels in the atmosphere, and for measuring the rate of ocean turnover = > CO2 greenhouse — Development of digital computers affects many fields including the calculation of radiation transfer in the atmosphere = > Radiation math, and makes it possible to model weather processes = > Models (GCMs)-- Geological studies of polar wandering help provoke Ewing - Donn model of ice ages = > Simple models — Improvements in infrared instrumentation (mainly for industrial processes) allow very precise measurements of atmospheric CO2 = > CO2 greenhouse.

They have focused on looking at the warmer climates of the Cenozoic (the Pliocene, etc.) to avoid the confusion from the response of ice sheets to orbital forcing during the ice age cycles of the Pleistocene, but obviously have significant uncertainties due to less precision about ancient greenhouse gas levels.

After asking for comments on, «Atmospheric CO2 concentrations during ancient greenhouse climates were similar to those predicted for A.D. 2100.

Raypierre's climate book in Chapter 5 gives a good overview of scattering, particularly Rayleigh and Mie scattering which help explain things why aerosols scatter light, why the sky appears blue, why CO2 clouds (say on ancient Mars) can scatter infrared radiation good but water clouds on Earth don't have that effect, etc..