Sentences with phrase «changed over the past millennium»

In contrast to these recent changes, there is one tradition that has not changed over the past millennium: the mixed use of green and blue.

Most famously, in 2003, Soon co-authored a paper in the journal Climate Research that questioned the standard interpretation of climate change over the past millennium and argued that recent warming is not unusual by historical standards.

Not exact matches

Over the past millennium the bacterium Mycobacterium leprae, which causes leprosy (Hansen's disease), has changed very slowly.

In the past decade, paleoclimatologists have reconstructed a record of climate change over the last millennium by consulting historical documents and examining indicators of temperature change like tree rings, as well as oxygen isotopes in ice cores and coral skeletons.

Hawks notes that such changes would be consistent with the many brain - related DNA mutations seen over the past 20 millennia.

The NRC asked the committee to summarize current scientific information on the temperature record for the past two millennia, describe the main areas of uncertainty and how significant they are, describe the principal methodologies used and any problems with these approaches, and explain how central is the debate over the paleoclimate temperature record to the state of scientific knowledge on global climate change.

Mike Wallace's talk was about the «National Research Council Report on the «Hockey Stick Controversy»... The charge to the committee, was «to summarize current information on the temperature records for the past millennium, describe the main areas of uncertainty and how significant they are, describe the principal methodologies used and any problems with these approaches, and explain how central is the debate over the paleoclimate record within the overall state of knowledge on global climate change.»

That estimate was based in part on the fact that sea level is now rising 3.2 mm / yr (3.2 m / millennium)[57], an order of magnitude faster than the rate during the prior several thousand years, with rapid change of ice sheet mass balance over the past few decades [23] and Greenland and Antarctica now losing mass at accelerating rates [23]--[24].

The status of women in India has been subject to many great changes over the past few millennia.

The white men who can get past the mental anguish of my black penis The status of women in India has been subject to many great changes over the past few millennia.

Indeed, the utility of the term in describing past climate changes at regional scales has been questioned [see e.g. Jones, P.D., Mann, M.E., Climate Over Past Millennia, Reviews of Geophysics, 42, RG2002, doi: 10.1029 / 2003RG000143, 2004 and references therepast climate changes at regional scales has been questioned [see e.g. Jones, P.D., Mann, M.E., Climate Over Past Millennia, Reviews of Geophysics, 42, RG2002, doi: 10.1029 / 2003RG000143, 2004 and references therePast Millennia, Reviews of Geophysics, 42, RG2002, doi: 10.1029 / 2003RG000143, 2004 and references therein.]

I was somewhat involuntarily thrust into the center of the public debate over climate change at this very time, when the «Hockey Stick» temperature reconstruction I co-authored, depicting the unprecedented nature of modern warming in at least the past millennium, developed into an icon in the debate over human - caused climate change [particularly when it was featured in the Summary for Policy Makers (SPM) of the Third Assessment Report of the IPCC in 2001].

In fact, there is reasonably compelling evidence that changes in drought in the western U.S. over the past millennium may, in large part, reflect the forced response of ENSO to past volcanic and solar radiative forcing.

However, they do argue that the reconstruction reflects long - term changes in «orbital configurations» that have continually reduced Northern Hemisphere summer «insolation» (solar irradiance) over the past two millennia.

This natural influence should oscillate but not trend very fast, since a fast trend could not have been sustained over the past several millennia but we have no reason to expect a dramatic change over that period.

The change in total solar irradiance over recent 11 - year sunspot cycles amounts to < 0.1 %, but greater changes at ultraviolet wavelengths may have substantial impacts on stratospheric ozone concentrations, thereby altering both stratospheric and tropospheric circulation patterns... This model prediction is supported by paleoclimatic proxy reconstructions over the past millennium.

We used PDSI values from the North American Drought Atlas (NADA, version 2a) to detect changes in aridity variability and periodicity for the Southwest over the past millennium.

Simulations where the magnitude of solar irradiance changes is increased yield a mismatch between model results and CO2 data, providing evidence for modest changes in solar irradiance and global mean temperatures over the past millennium and arguing against a significant amplification of the response of global or hemispheric annual mean temperature to solar forcing.

These changes in tropical Pacific Ocean SSTs over the past millennium have often been associated with internal variability of the ocean - atmosphere system [19,27,53,54] that may not be accurately represented in current climate models.

The drivers of change in the ENSO regime over the past millennium differ from those in the mid-Holocene.

That estimate was based in part on the fact that sea level is now rising 3.2 mm / yr (3.2 m / millennium)[57], an order of magnitude faster than the rate during the prior several thousand years, with rapid change of ice sheet mass balance over the past few decades [23] and Greenland and Antarctica now losing mass at accelerating rates [23]--[24].

Changes in solar activity mirror changes in the Pacific state and changes in global temperature over the past millChanges in solar activity mirror changes in the Pacific state and changes in global temperature over the past millchanges in the Pacific state and changes in global temperature over the past millchanges in global temperature over the past millennium.

The small variations in pre-industrial CO2 and CH4 concentrations over the past millennium are consistent with millennial - length proxy Northern Hemisphere temperature reconstructions; climate variations larger than indicated by the reconstructions would likely yield larger concentration changes.

Here, we argue that the twentieth and twenty - first centuries, a period during which the overwhelming majority of human - caused carbon emissions are likely to occur, need to be placed into a long - term context that includes the past 20 millennia, when the last Ice Age ended and human civilization developed, and the next ten millennia, over which time the projected impacts of anthropogenic climate change will grow and persist.

Modeled regional and global climate responses to simulated (107, 110, 111) and reconstructed historical land cover changes over the past century (112) and millennium (113) generally agree that anthropogenic deforestation drives biogeophysical cooling at higher latitudes and warming in low latitudes and suggest that biogeochemical impacts tend to exceed biogeophysical effects (113).

So, after reading about climate change for awhile and how the «Temperature of the Earth» has moved up and down in increments of hundredths of a degree, over the past millennium or two, you are looking for a precise, scientific definition of the thing that has varied?

«Climate over Past Millennia» is an interesting and detailed paper dealing with many aspects of the building blocks of our changing climate.

The reconstructed changes in sea level over the past millennium are consistent with past global temperatures, the researchers say, and can be determined using a model relating the rate of sea level rise to global temperature.

It all comes down to the fact that over the past four millennia there have been more changes in climate there which these forests have been through.

«Having a detailed picture of rates of sea level change over the past two millennia provides an important context for understanding current and potential future changes,» says Paul Cutler, program director in NSF's Division of Earth Sciences.

We review evidence for climate change over the past several millennia from instrumental and high - resolution climate «proxy» data sources and climate modeling studies.

We focus on changes over the past 1 to 2 millennia.

Argues that the twentieth and twenty - first centuries, a period during which the overwhelming majority of human - caused carbon emissions are likely to occur, need to be placed into a long - term context that includes the past 20 millennia, when the last Ice Age ended and human civilization developed, and the next ten millennia, over which time the projected impacts of anthropogenic climate change will grow and persist