Sentences with phrase «past temperature patterns»
Pennsylvania State University has found no evidence of research misconduct on the part of Michael Mann, the prominent climatologist who is a leader in efforts to chart Earth's past temperature patterns and has been a longstanding target of groups and individuals fighting restrictions on greenhouse gases.
https://dotearth.blogs.nytimes.com/ Not exact matches
The second reference is, of course, the first MBH Nature paper, Global - scale temperature patterns and climate forcing over the past six centuries.
Extremes in local and regional weather patterns and climate variability have disrupted agricultural production in the past; climate - related temperature rise is expected to increasingly affect crop yields in many regions of the world.
Mann, M.E., R.S. Bradley, and M.K. Hughes, 1998: Global - scale temperature patterns and climate forcing over the past six centuries.
It's worth saying at first that they are remarkably good already at simulating the general patterns of climate, the general circulation of the atmosphere and the past trend of global temperatures.
This single - year snapshot of the planet's warmth fits with the pattern of ever - warmer temperatures that has been in place over the past century, particularly since the early 1980s as the warming fueled by an accumulation of greenhouse gases clearly emerged.
Despite large year - to - year variability of temperature, decadal averages reveal isotherms (lines of a given average temperature) moving poleward at a typical rate of the order of 100 km / decade in the past three decades [101], although the range shifts for specific species follow more complex patterns [102].
They wait on the tips of grasses and shrubs where they sense odors, vibrations, changes in temperature or light patterns that occur as a host walks past.
Response: < / b > von Storch et al purport to test statistical methods used to reconstruct past climate patterns from «noisy» proxy data by constructing false proxy records («pseudoproxy» records) based on adding noise to model gridbox temperature series taken from a climate simulation forced with estimated past radiative forcing changes.
This approach may not be useful for quantitative reconstructions of past spatial patterns of climate fields, e.g. surface temperature, sea level pressure, drought, etc..
Mann, M.E., Gille, E., Bradley, R.S., Hughes, M.K., Overpeck, J.T., Keimig, F.T., Gross, W., Global Temperature Patterns in Past Centuries: An interactive presentation, Earth Interactions, 4 - 4, 1 - 29, 2000.
Such an enhanced east - west temperature gradient across the tropical Pacific during medieval times is suggestive of a La Nina type pattern, something that too has been discussed in the recent past.
Although some earlier work along similar lines had been done by other paleoclimate researchers (Ed Cook, Phil Jones, Keith Briffa, Ray Bradley, Malcolm Hughes, and Henry Diaz being just a few examples), before Mike, no one had seriously attempted to use all the available paleoclimate data together, to try to reconstruct the global patterns of climate back in time before the start of direct instrumental observations of climate, or to estimate the underlying statistical uncertainties in reconstructing past temperature changes.
A lack of quality in prior data make statements about the specific form of the heating shape impossible to correlate to see if this warming is faster, has a pattern that is detectably different than past temperature changes.
Here are some possible choices — in order of increasing sophistication: * All (or most) scientists agree (the principal Gore argument) * The 20th century is the warmest in 1000 years (the «hockeystick» argument) * Glaciers are melting, sea ice is shrinking, polar bears are in danger, etc * Correlation — both CO2 and temperature are increasing * Sea levels are rising * Models using both natural and human forcing accurately reproduce the detailed behavior of 20th century global temperature * Modeled and observed PATTERNS of temperature trends («fingerprints») of the past 30 years agree
Mann, M.E., R.S. Bradley, and M.K. Hughes, Global - scale temperature patterns and climate forcing over the past six centuries, Nature, 392, 779 - 787, 1998.
See e.g. this review paper (Schmidt et al, 2004), where the response of a climate model to estimated past changes in natural forcing due to solar irradiance variations and explosive volcanic eruptions, is shown to match the spatial pattern of reconstructed temperature changes during the «Little Ice Age» (which includes enhanced cooling in certain regions such as Europe).
For the most recent past, the Atlantic flow index we calculated from the temperature pattern is consistent with other data.
For example, one might predict that the pattern they see (wide rings more common) would be prevalent in cooler, wetter parts of Alaska, whereas the opposite pattern (wide rings less common) might be more prevalent in warmer, drier parts, where warming may have pushed temperature past critical thresholds to the point where warm temps become a limiting factor.
von Storch et al purport to test statistical methods used to reconstruct past climate patterns from «noisy» proxy data by constructing false proxy records («pseudoproxy» records) based on adding noise to model gridbox temperature series taken from a climate simulation forced with estimated past radiative forcing changes.
NASA's Goddard Institute for Space Studies, the World Meteorological Organization, the National Oceanic and Atmospheric Administration, and Britain's Hadley Center have all issued recaps of the past year's temperature patterns today.
«Researchers working at the Australian National University Research School of Earth Sciences have discovered century - scale patterns in Pacific rainfall and temperature, and linked them with global climate changes in the past 2000 years.
If, as Jim Cripwell writes, we can not even show that the temperature / time patterns of the past changed significantly when human CO2 emissions increased, we have no empirical basis to support the notion of any «sensitivity» at all — only theory.
«Spatially resolved global reconstructions of annual surface temperature patterns over the past six centuries are based on the multivariate calibration of widely distributed high - resolution proxy climate indicators.
* There is too much conflicting evidence about climate change to know whether it is actually happening * Current climate change is part of a pattern that has been going on for millions of years * Climate change is just a natural fluctuation in Earth's temperatures * Even if we do experience some consequences from climate change, we will be able to cope with them * The effects of climate change are likely to be catastrophic * The evidence for climate change is unreliable * There are a lot of very different theories about climate change and little agreement about which is right * Scientists have in the past changed their results to make climate change appear worse than it is * Scientists have hidden research that shows climate change is not serious * Climate change is a scam * Social / behavioural scepticism measures * Climate change is so complicated, that there is very little politicians can do about it * There is no point in me doing anything about climate change because no - one else is * The actions of a single person doesn't make any difference in tackling climate change * People are too selfish to do anything about climate change * Not much will be done about climate change, because it is not in human nature to respond to problems that won't happen for many years * It is already too late to do anything about climate change * The media is often too alarmist about climate change * Environmentalists do their best to emphasise the worst possible effects of climate change * Climate change has now become a bit of an outdated issue * Whether it is important or not, on a day - to - day basis I am bored of hearing about climate change
Replicate Figure 18 of Mann et al, Global Temperature Patterns in Past Centuries: An Interactive Presentation, Earth Interactions, 4 - 4, 1 - 29,2000.
«Corrigendum: Global - Scale Temperature Patterns and Climate Forcing over the Past Six Centuries.»
In the past, a high difference in temperature from north to south helped drive a prevailing wind pattern called the Jet Stream which kept weather systems moving across the Northern Hemisphere.
Regardless what it's called, this dipole pattern — abnormally high temperatures over much of the West along with chilly conditions in the East — has dominated North American weather in four of the past five winters.
The real concern lies with increase of both carbon dioxide emissions and temperature that can not be predicted using the models of past climate fluctuations and patterns.
The shift can be explained by changing precipitation patterns and higher average temperatures that make moisture evaporate from the soil more rapidly than in the past, the study said.
Their calculations told them that, if that was so, then air temperatures worldwide would rise to force a new climate regime — that is, the climate pattern would shift continuously beyond the most extreme records experienced in the past 150 years.
Michael Mann et al., «Global - scale temperature patterns and climate forcing over the past six centuries,» Nature, Vol.
Average global temperatures have increased by about 0.2 degrees Celsius (0.36 degrees Fahrenheit) over the past 20 years and are widely believed to be responsible for new extremes in weather patterns.
Perth's seasonal temperature patterns have shifted over the past 150 years with most warming between November and April, while winter / spring months have remained about the same temperature or even cooled.
Similarly, Australia has seen the odds of both heavy rainfalls and droughts increase, and similar patterns are being observed worldwide, coinciding with rising temperatures over the past 50 years.
To elucidate their spatio - temporal pattern, we reconstructed past temperatures for seven continental - scale regions during the past one to two millennia.
Working with a total of 2,196 globally - distributed databases containing observations of NPP, as well as the five environmental variables thought to most impact NPP trends (precipitation, air temperature, leaf area index, fraction of photosynthetically active radiation, and atmospheric CO2 concentration), Li et al. analyzed the spatiotemporal patterns of global NPP over the past half century (1961 — 2010).
Let's look back on the past few months, to see how much February — April global temperature and rain patterns reflected those expected (temperature, rain) during La Niña!
Even while identifying some of the observed change in climatic behaviour, such as a 0.4 C increase in surface temperature over the past century, or about 1 mm per year sea level rise in Northern Indian Ocean, or wider variation in rainfall patterns, the document notes that no firm link between the do...
Kaplan SST Description: This analysis uses present - day temperature patterns to enhance the meager data available in the past.
Mann even showed the same hockey stick pattern * without * the tree ring proxies that some people had objected to: «Proxy - based reconstructions of hemispheric and global surface temperature variations over the past two millennia»
The hockey stick pattern also shows up in the following papers: «Pacific Ocean Heat Content During the Past 10,000 Years» «Inter-hemispheric temperature variability over the past millennium&raPast 10,000 Years» «Inter-hemispheric temperature variability over the past millennium&rapast millennium»
The pattern of temperature change through the layers of the atmosphere, with warming near the surface and cooling higher up in the stratosphere, further confirms that it is the buildup of heat - trapping gases (also known as «greenhouse gases») that has caused most of the Earth's warming over the past half century.
Singh and her Lamont colleagues research climate change impacts on weather patterns by analyzing weather trends in daily temperatures, precipitation, and atmospheric patterns that have occurred during the past 40 years, in the post-satellite era.
Mann, M., R.S. Bradley and M.K. Hughes, 1998: Global scale temperature patterns and climate forcing over the past six centuries.
This was achieved by the Mann, Bradley, and Hughes 1998 paper in Nature titled, Global — scale temperature patterns and climate forcing over the past six centuries, the original peer - reviewed hockey stick article.
This Section places particular emphasis on current knowledge of past changes in key climate variables: temperature, precipitation and atmospheric moisture, snow cover, extent of land and sea ice, sea level, patterns in atmospheric and oceanic circulation, extreme weather and climate events, and overall features of the climate variability.
The paper by Mann, and Professor Raymond Bradley and Professor Malcolm Hughes was titled Global - Scale Temperature Patterns and Climate Forcing Over the Past Six Centuries.
Despite large year - to - year variability of temperature, decadal averages reveal isotherms (lines of a given average temperature) moving poleward at a typical rate of the order of 100 km / decade in the past three decades [101], although the range shifts for specific species follow more complex patterns [102].