Sentences with phrase «late medieval warm»

Greenland temperature variability is high and there is evidence during the late Medieval Warm Period of a warm period in year 1150, that is 862 years before present (Kobashi et al. 2011).

The late Medieval warm period is called a climatic optimum for a good reason.

Not exact matches

There was no explanation of why both the medieval warm period and the little ice age, very clearly shown in the 1990 report, had simply disappeared eleven years later.

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.

... Continental - scale surface temperature reconstructions show, with high confidence, multi-decadal periods during the Medieval Climate Anomaly (950 to 1250) that were in some regions as warm as in the mid-20th century and in others as warm as in the late 20th century.

The conclusion that certain regions were similarly warm (i.e. comparable to late 20th century) during medieval times is uncontroversial (for example, this is true w / the Obsorn and Briffa, 2006 study mentioned in the main article).

Looking at just recent history we have the Roman Warm Period around the 1st century, 500 years later the dark ages (massive crop failures and starvation), another 500 years the Medieval Warm Period and 500 years later the Little Ice Age.

Fair enough, but two points are clear — the two warm periods reconstructed — Medieval and late 1700s are > 0.6 C cooler than recent NH anomalies of around 1C CRU], which means that while the details differ, McIntyre's plot is fully consistent with the conclusion of Mann et al 2008 that recent warmth is unprecedented for 1,000 years or more.

â $ œThe late Holocene records clearly identify Neoglacial events of the Little Ice Age (LIA) and Medieval Warm Period (MWP).

Earth and Planetary Science Letters Volumes 325 — 326, 1 April 2012, Pages 108 — 115 An ikaite record of late Holocene climate at the Antarctic Peninsula This ikaite record qualitatively supports that both the Medieval Warm Period and Little Ice Age extended to the Antarctic Peninsula.

Greenland was green «CfA's Sallie Baliunas -LSB-...] refers to the medieval Viking sagas as examples of unusual warming around 1003 A.D. «The Vikings established colonies in Greenland at the beginning of the second millennium, but they died out several hundred years later when the climate turned colder,» she notes.»

As the start date pushed into October from the late 1400s so Europe entered a period known as the Little Ice Age, which followed the Medieval Warm Period.

Concerning text on the Medieval Climate Anomaly, Belgium and Ireland underscored that this phenomenon was regional in nature, unlike global warming in late 20th century, and suggested clarifying language to reflect this.

But in the 2001 IPCC report, the Medieval Warm period disappeared and became much cooler than the late 20th century.

(6) Ice core data provide evidence of a quasi millennial oscillation with alternating warm and cool periods: ● Minoan Warm Period about 3 k - years ago ● Roman Warm Period about 2 k - years ago ● Dark (cool) Age about 1.5 k - year ago ● Medieval Warm Period from about early 10th to late 14th century ● Little Ice Age from about late 14th to mid 19th centwarm and cool periods: ● Minoan Warm Period about 3 k - years ago ● Roman Warm Period about 2 k - years ago ● Dark (cool) Age about 1.5 k - year ago ● Medieval Warm Period from about early 10th to late 14th century ● Little Ice Age from about late 14th to mid 19th centWarm Period about 3 k - years ago ● Roman Warm Period about 2 k - years ago ● Dark (cool) Age about 1.5 k - year ago ● Medieval Warm Period from about early 10th to late 14th century ● Little Ice Age from about late 14th to mid 19th centWarm Period about 2 k - years ago ● Dark (cool) Age about 1.5 k - year ago ● Medieval Warm Period from about early 10th to late 14th century ● Little Ice Age from about late 14th to mid 19th centWarm Period from about early 10th to late 14th century ● Little Ice Age from about late 14th to mid 19th century.

The late tenth to early thirteenth centuries (about AD 950-1250) appear to have been exceptionally warm in western Europe, Iceland and Greenland (Alexandre 1987, Lamb, 1988) This period is known as the Medieval Climatic Optimum China was, however, cold at this time (mainly in winter) but South Japan was warm (Yoshino, 1978) This period of widespread warmth is...

Noteworthy in the reconstructions are the post-1976 warm / wet period, unprecedented in the 1,425 - year record both in amplitude and duration, anomalous and prolonged late 20th century warmth, that while never exceeded, was nearly equaled in magnitude for brief intervals in the past, and substantial decadal - scale variability within the Medieval Warm Period and Little Ice Age intervwarm / wet period, unprecedented in the 1,425 - year record both in amplitude and duration, anomalous and prolonged late 20th century warmth, that while never exceeded, was nearly equaled in magnitude for brief intervals in the past, and substantial decadal - scale variability within the Medieval Warm Period and Little Ice Age intervWarm Period and Little Ice Age intervals.

''... worked with two sediment cores they extracted from the seabed of the eastern Norwegian Sea, developing a 1000 - year proxy temperature record «based on measurements of δ18O in Neogloboquadrina pachyderma, a planktonic foraminifer that calcifies at relatively shallow depths within the Atlantic waters of the eastern Norwegian Sea during late summer,» which they compared with the temporal histories of various proxies of concomitant solar activity... This work revealed, as the seven scientists describe it, that «the lowest isotope values (highest temperatures) of the last millennium are seen ~ 1100 - 1300 A.D., during the Medieval Climate Anomaly, and again after ~ 1950 A.D.» In between these two warm intervals, of course, were the colder temperatures of the Little Ice Age, when oscillatory thermal minima occurred at the times of the Dalton, Maunder, Sporer and Wolf solar minima, such that the δ18O proxy record of near - surface water temperature was found to be «robustly and near - synchronously correlated with various proxies of solar variability spanning the last millennium,» with decade - to century - scale temperature variability of 1 to 2 °C magnitude.»

I don't necessarily see any contradiction whatsoever with the work of Mann et al., which showed that although many individual regions experienced similar warmth to modern warmth sometime in some broadly - defined «Medieval Warm Period», the warmest times were asynchronous in different regions and, hence, when you looked globally the warmth was not as great as the late 20th century warmth which was not asynchronous.

The growth rings of trees provided the evidence for reconstructions of what climatologists call the warm Medieval period, and the researchers matched the picture from the past with 17 different computer model predictions of the climate later in the 21st century.

Anyone who admits that would also have to admit that the climate models (which don't «predict» a Medieval Warm Period) are inadequate, don't understand all the forcings, and are therefore woefully inadequate for attribution studies (the ones that «tell» us what caused the latest warming).

So we look at the last ten thousand years, and we see a warming like all the others which have never stopped alternating with coolings; we see a dribble of sea level rise since the late 1700s which is as normal as cornflakes in the morning; we see polar ice variations well in line with what everybody USED to know about the medieval period till recently...

«Continental - scale surface temperature reconstructions show, with high confidence, multi-decadal periods during the Medieval Climate Anomaly (year 950 to 1250) that were in some regions as warm as in the late 20th century.

The medieval warming is, however, markedly exceeded by late 20th and early 21st century warming, as temperatures now stand more than 0.8 °C above the 1850 — 2006 mean (32).

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.

«Surface temperature reconstructions show multi-decadal intervals during the Medieval Climate Anomaly (950-1250) that were in some regions as warm as in the late 20th Century.

The 900 - year long handle completely ignores two indisputable eras, the Medieval Warm Period, from about 950 to 1250 A.D. and the later Little Ice Age from 1300 to 1850.

It would be remiss not to connect the Roman warm optimum and the series of savage winters recorded above that afflicted Constantinople, with the great medieval warming of Greenland and the age of the Vikings several hundred years later.

Hence, although the climate of northern Fennoscandia seems to have been significantly warmer during medieval times as compared to the late - twentieth century, the published composite records of northern hemisphere climate (Moberg et al. 2005) do not show a conspicuously warm period around ad 1000.

Grudd's paper (available here, open access) deals solely with summer temperatures at Lake Tornetrask in Northern Sweden, and the paper states clearly that «although the climate of northern Fennoscandia seems to have been significantly warmer during medieval times as compared to the late - twentieth century, the published composite records of northern hemisphere climate (Moberg et al. 2005) do not show a conspicuously warm period around AD 1000.»

(As an aside, remember that AGW supporters write off the Medieval Warm Period because it was merely a local phenomena in the Northern Hemisphere not observed in the south — can't we apply the same logic to the late 20th century based on this satellite data?)