Sentences with phrase «century warm period»

Late Twentieth Century Warm Period would be LTCWP, for example.

As I discussed previously, the Arctic has warmed rapidly over the last century but this warming has occurred in two phases with an early century warm period (1910 - 1950) and a late - century warm period (1975 - present).

It may well be that the recent warm period was warmer than the early 20th century warm period, as the raw data suggests... Or it may be that biases in the raw data are substantial, and the early 20th century warm period was just as warm as the recent warm period, or maybe even warmer.

So, we don't know how they behaved during the early 20th century warm period (1920s - 1940s).

Increases in GrIS melt and runoff during this past century warm period must have been significant and were probably even larger than that of the most recent last decade (1995 - 2006).»

â $ œOscillating warm and cold periods could be related to the 20th century warm period, the Little Ice Age, the Medieval Warm Period, the Dark Ages Cold Period, and the Roman Warm Period.â $ http://www.agu.org/pubs/crossref/2006/2006GL026151.shtml

SAT observations and model simulations indicate that the nature of the arctic warming in the last two decades is distinct from the early twentieth - century warm period.

a) Our models can not explain the early 20th century warming period b) We know that the (statistically indistinguishable) late 20th century warming was caused principally by human - caused forcing.

Obviously, this type of decadal analysis reveals an abundance of similarities shared by the two 20th century warming periods.

The above paper refers to the late 20th century warming period when the stratosphere was cooling and ozone was falling.

A substantial concern for me when preparing my initial Model description was that for the sequence of events to be true the cooling of the stratosphere during the late 20th century warming period had to be natural without needing to invoke human CO2 or CFCs.

All we know clearly is that CO2 doesn't appear to have been a significant factor in the early 20th Century warming period, but does appear to be at least a significant factor in the warming between 1970 and around 2000.

Note that I research and illustrate the late 20th Century warming period for a number of reasons.

Greenhouse gas forcing of the late century warming period increased by 0.7 W / m2.

The late 20th century warming period is therefor eclearly not «unprecendented» even within the last 100 years let alone 100 years as Michael Mann's (and Keith Briffa's) cherry picking of proxies and use of «novel statistical methods» like de-centred PCA would have us all believe.

Much is made of the late 20th century warming period.

They have also been unable to explain earlier warming cycles, which are statistically indistinguishable from the late 20th century warming period, but occurred before there could have been any significant CO2 impact.

Not exact matches

Marc Scott, a portfolio manager at American Century Investments, says that the warm weather in 2012 caused demand to fall by 12 % from the same period the year before.

During the first third of the year, from January through April, the average temperature for the contiguous United States was 4 degrees Fahrenheit above the 20th - century average, making this period the second warmest on record, according to the National Oceanic and Atmospheric Administration.

Heavier rainfall at the study sites from the year 0 to 400, and again during Europe's Medieval Warm Period, just before the Little Ice Age from about the year 800 to 1300, was probably caused by a centuries - long strengthening of El Niño.

The surge in melt events corresponds to a summer temperature increase of at least 1.2 - 2 degrees Celsius (2.2 - 3.6 degrees Fahrenheit) relative to the warmest periods of the 18th and 19th centuries, with nearly all of the increase occurring in the last 100 years.

Short - lived climate pollutants are so called because even though they warm the planet more efficiently than carbon dioxide, they only remain in the atmosphere for a period of weeks to roughly a decade whereas carbon dioxide molecules remain in the atmosphere for a century or more.

Land Only: The January - August worldwide land surface temperature was 1.82 °F (1.01 °C) above the 20th century average, the fifth warmest such period on record.

But they looked for 50 - year - long anomalies; the last century's warming, the IPCC concludes, occurred in two periods of about 30 years each (with cooling in between).

In contrast, the consensus view among paleoclimatologists is that the Medieval Warming Period was a regional phenomenon, that the worldwide nature of the Little Ice Age is open to question and that the late 20th century saw the most extreme global average temperatures.

The warmest period occurred in the late 20th century — too short to meet Soon and Baliunas's selected requirement.

They concluded in the January Climate Research that «across the world, many records reveal that the 20th century is probably not the warmest nor a uniquely extreme climate period of the last millennium.»

The new analysis suggests no discernable decrease in the rate of warming between the second half of the 20th century, a period marked by manmade warming, and the first fifteen years of the 21st century, a period dubbed a global warming

June — August 2014, at 0.71 °C (1.28 °F) higher than the 20th century average, was the warmest such period across global land and ocean surfaces since record keeping began in 1880, edging out the previous record set in 1998.

According to the AAAS What We Know report, «The projected rate of temperature change for this century is greater than that of any extended global warming period over the past 65 million years.»

With ENSO - neutral conditions present during the first half of 2013, the January — June global temperature across land and ocean surfaces tied with 2003 as the seventh warmest such period, at 0.59 °C (1.06 °F) above the 20th century average.

The public, press and policy makers have been repeatedly told that three claims have widespread scientific support: Global temperature has risen about a degree since the late 19th century; levels of CO2 in the atmosphere have increased by about 30 % over the same period; and CO2 should contribute to future warming.

For the Quelccaya Ice Cap (13.95 oS, 70.83 oW), this work revealed that peak temperatures of the mediaeval warm period were warmer than those of the last few decades of the 20th century.»

peak temperatures of the mediaeval warm period were warmer than those of the last few decades of the 20th century»?

In his Figure 5 under a section entitled «A New Northern Hemisphere Summer Temperature Record» he shows that the mid to late 20th century temperature as determined from tree ring analysis is far warmer than any period in the past that his analysis includes (this only goes back to 1400 AD).

As discussed elsewhere on this site, modeling studies indicate that the modest cooling of hemispheric or global mean temperatures during the 15th - 19th centuries (relative to the warmer temperatures of the 11th - 14th centuries) appears to have been associated with a combination of lowered solar irradiance and a particularly intense period of explosive volcanic activity.

A confounding factor in discussions of this period is the unfortunate tendency of some authors to label any warm peak prior to the 15th Century as the «Medieval Warm Period» in their rperiod is the unfortunate tendency of some authors to label any warm peak prior to the 15th Century as the «Medieval Warm Period» in their recwarm peak prior to the 15th Century as the «Medieval Warm Period» in their recWarm Period» in their rPeriod» in their record.

For the late 20th century, a period of strong greenhouse gas increases, but with diminishing solar influence, variability in ocean warming shown in the profiles falls much further still.

Warm period during the mid-20th and 21st centuries (modern solar maximum).

The State of the Climate November 2015 report noted that in order for 2015 to not become the warmest year in the 136 - year period of record, the December global temperature would have to be at least 0.81 °C (1.46 °F) below the 20th century average — or 0.24 °C (0.43 °F) colder than the current record low December temperature of 1916.

In his seminal 1982 book Climate, History, and the Modern World, the renown climatologist Dr. H.H. Lamb revealed that sea ice in the subarctic and Arctic regions was much less extensive during the Medieval Warm Period (9th - 13th centuries) compared to today.

If you look at the proxy portion of the new Moberg graphic, you see nothing that would be problematic for opponents of the hockey stick: it shows a striking Medieval Warm Period (MWP), a cold Little Ice Age and 20th century warming not quite reaching MWP levels by 1979, when the proxy portion of the study ends.

The contiguous U.S. had its warmest January - to - June period since records began in the late 19th century.

In the paper Gray makes many extravagant claims about how supposed changes in the THC accounted for various 20th century climate changes («I judge our present global ocean circulation conditions to be similar to that of the period of the early 1940s when the globe had shown great warming since 1910, and there was concern as to whether this 1910 - 1940 global warming would continue.

Simulations including an increased solar activity over the last century give a CO2 initiated warming of 0.2 ˚C and a solar influence of 0.54 ˚C over this period, corresponding to a CO2 climate sensitivity of 0.6 ˚C (doubling of CO2) and a solar sensitivity of 0.5 ˚C (0.1 % increase of the solar constant).

He said that using an earlier baseline period would have better captured all the warming that has occurred, as there was some small amount already in the late 19th century.

However, one of the panel's reservations was that ``... a statistical method used in the 1999 study was not the best and that some uncertainties in the work «have been underestimated,»...» The panel concluded «Based on the analyses presented in the original papers by Mann et al. and this newer supporting evidence, the committee finds it plausible that the Northern Hemisphere was warmer during the last few decades of the 20th century than during any comparable period over the preceding millennium.

This concatenation, which has global temperature 13.9 °C in the base period 1951 — 1980, has the first decade of the 21st century slightly (∼ 0.1 °C) warmer than the early Holocene maximum.

The public, press and policy makers have been repeatedly told that three claims have widespread scientific support: Global temperature has risen about a degree since the late 19th century; levels of CO2 [carbon dioxide] in the atmosphere have increased by about 30 percent over the same period; and CO2 should contribute to future warming.

If you look back 12 months, the period from June 2011 through May 2012 was the warmest 12 - month block since records started to be kept more than a century ago.