Sentences with phrase «warm phase period»

Not exact matches

«It confirms that the during the Medieval Warm Period between 1080 and 1430 the oscillation index was in an unusually prolonged positive phase, which brings increased rain to Scotland and drier conditions in the western Mediterranean,» says Baker, of the UNSW Connected Waters Initiative Research Centre.

«Currently, our planet is in a warm phase — an interglacial period — and the associated increased climate sensitivity needs to be taken into account for future projections of warming induced by human activities.»

Most of flood periods coincided with the warm phase of the Atlantic Multidecadal Oscillation (AMO).

This warm phase had begun in the Cretaceous period, peaked in the early Eocene, and continued to the end of the Eocene, when global temperatures dropped and ice sheets formed over the Antarctic.

Any form of strenuous exercise should be preceded by a warm - up phase and followed by a cool - down period.

If you are trying to attribute warming over a short period, e.g. since 1980, detection requires that you explicitly consider the phasing of multidecadal natural internal variability during that period (e.g. AMO, PDO), not just the spectra over a long time period.

To achieve such a cycle, BNO (S) must at a minimum warm the surface and atmosphere of the planet by a total of 0.31 °C during 1970 - 99 which would require more than perhaps 20 ZJ during the warming phase, equally divided between the first half and the last half of this 1970 - 99 period.

These phases, which last 30 years, giving a 60 - year cycle, must be carefully allowed for: otherwise the error made by many early models would arise: they based their predictions on the warming rate from 1976 - 2001, a period wholly within a warming phase of the Pacific Decadal Oscillation.

Judith's point about the warm phase of the PDO from 1976 - 1998 is a good one, and the question quite germain to trying to understand how much of that period was anthropogenic versus PDO, but the more important point is actually how much is the PDO (and by extension, the nature of the ENSO cycle) being influenced by the highest GH gas concentrations in millions of years.

One of the most politically charged allegations is that Jones, together with scientific collaborators, tried to systematically downplay the importance of the Medieval Warm Period (MWP), a brief phase of natural, pre-industrial warming that may have occurred around 1000 AD.

It was then called the Great Pacific Climate Shift but since that time it has been subsumed into the PDO phase shift from cool to warm phase that supposedly has a thirty year period.

In 1995, after a relatively quiet period in the Atlantic, the AMO flipped to the warm phase.

For falsification we would need to observe events such as the mid latitude jets moving poleward during a cooling oceanic phase and a period of quiet sun or the ITCZ moving northward whilst the two jets moved equatorward or the stratosphere, troposphere and upper atmosphere all warming or cooling in tandem or perhaps an unusually negative Arctic Oscillation throughout a period of high solar activity and a warming ocean phase.

The Oort minimium steps out of line as the line up goes out of sync, the planets do nt quite come back exactly the same each 179 yrs and it seems from the Wolf until now is a window of line ups that might take 1000's of years to return, during the medieval warm period J+S were poorly aligned as the phase gradually shifted.

And they analyse the double standards used when discussing the so - called «pause» as compared to an equally long period of rapid warming, which in fact deviated more from the long - term trend than the recent phase of slower warming.

Figure 5 - Atlantic ocean warming down to 1500 metres for the 1999 - 2012, a period covering the majority of the current negative IPO phase.

During that same period, average annual rainfall in New South Wales declined by 3.6 inches (92 millimeters).3 Scientists think the decline in autumn rainfall in southeast Australia since the late 1950s may be partly due to increases in heat - trapping gases in Earth's atmosphere.3, 14 Major bushfires over southeast Australia are linked to the positive phase of an ocean cycle called the «Indian Ocean Dipole» — when sea surface temperatures are warmer than average in the western Indian Ocean, likely in response to global warming.15, 16

The width can change artificially by the current period being in a faster warming phase than the base period.

The scientists chose the period of time known as the «Holocene» for their research, because it is the most recent natural warm phase in Earth's history.

Or is the recent warming trend of 0.2 deg C per decade for the period 1970 - 2000 is just the warming phase of the multidecadal oscillation similar to that for the period 1910 - 1940?

... we showed that the rapidity of the warming in the late twentieth century was a result of concurrence of a secular warming trend and the warming phase of a multidecadal (~ 65 - year period) oscillatory variation and we estimated the contribution of the former to be about 0.08 deg C per decade since ~ 1980.

Regarding the period of 1976 - 2000, certainly we all know this period was dominated by El Nino's over La Nina, and as a warm phase PD, we were getting more sensible and latent heat flux from ocean to atmosphere.

Correction: 1976 - 2000 was a warm phase PDO, not «PD», unless your local Police Department was particularly warm during this period.

The 1978 - 1998 warming may be caused by the PDO warm phase in the same period.

Judith — you say «The stadium wave hypothesizes that the Arctic regional sea ice max / min are out of phase with the hemispheric warming / cooling periods, with the minima lagging the hemispheric warming period and occurring in the early half of the hemispheric cooling period.».

The stadium wave hypothesizes that the Arctic regional sea ice max / min are out of phase with the hemispheric warming / cooling periods, with the minima lagging the hemispheric warming period and occurring in the early half of the hemispheric cooling period.

Li et al., 2017 (DOI: 10.1016 / j.quascirev.2017.01.009): «Additionally, increased El Nino - Southern Oscillation (ENSO) strength (possibly El Ni ~ no - like phases) during drying periods, increased volcanic eruptions and the resulting aerosol load during cooling periods, as well as high volumes of greenhouse gases such as CO2 and CH4 during the recent warming periods, may also play a role in partly affecting the climatic variability in NC, superimposing on the overall solar dominated long - term control.»

In Wu et al. (2007) we showed that the rapidity of the warming in the late twentieth century was a result of concurrence of a secular warming trend and the warming phase of a multidecadal (~ 65 - year period) oscillatory variation and we estimated the contribution of the former [secular warming] to be about 0.08 °C per decade since ~ 1980.

• The warming phase during the modern era was 417 months in duration; the early 20th century period had a warming phase of 397 months (only a 20 - month difference).

Our devotee will also pass by the curious additional facts that a period of similar warming occurred between 1918 and 1940, well prior to the greatest phase of world industrialisation, and that cooling occurred between 1940 and 1965, at precisely the time that human emissions were increasing at their greatest rate.

Over the instrumental period (since the 1850s), North Atlantic SSTs show a 65 to 75 year variation (0.4 °C range), with a warm phase during 1930 to 1960 and cool phases during 1905 to 1925 and 1970 to 1990 (Schlesinger and Ramankutty, 1994), and this feature has been termed the AMO (Kerr, 2000), as shown in Figure 3.33.

At present, the Pacific shifts erratically and frequently between warm and cold phases, but paleoclimate data indicates that, even during the Holocene, there were extended periods when it was stuck in one phase or the other.

«A reduction in the rate of warming (not a pause) is a result of short - term natural variability, ocean absorption of heat from the atmosphere, volcanic eruptions, a downward phase of the 11 - year solar cycle, and other impacts over a short time period,» Cleugh says.

Like ENSO, there seems to be periods where warming phases are stronger or weaker naturally.

In Wu et al. (2007) we showed that the rapidity of the warming in the late twentieth century was a result of concurrence of a secular warming trend and the warming phase of a multidecadal (~ 65 - year period) oscillatory variation and we estimated the contribution of the former to be about 0.08 C per decade since ~ 1980.

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).

The minimum phase showed higher frequency events of volcanic activity than the maximum phase during the warming period, opposite to the cooling period.

Notice the overlap in warm phases (the 40's and 90's, both hot periods), and then the cold PDO in the 50 - 80's corresponded to a cold US.

For true falsification we would need to observe events such as the mid latitude jets moving poleward during a cooling oceanic phase and a period of quiet sun or the ITCZ moving northward whilst the two jets moved equatorward or the stratosphere, troposphere and upper atmosphere all warming or cooling in tandem or perhaps an unusually powerful Arctic Oscillation throughout a period of high solar turbulence and a warming ocean phase.

On the time - varying trend in global - mean surface temperature ``... we showed that the rapidity of the warming in the late twentieth century was a result of concurrence of a secular warming trend and the warming phase of a multidecadal (~ 65 - year period) oscillatory variation and we estimated the contribution of the former to be about 0.08 deg C per decade since ~ 1980.»

«Currently, our planet is in a warm phase — an interglacial period — and the associated increased climate sensitivity needs to be taken into account for future projections of warming induced by human activities.»

The next rising phase of AMO (7, 8, 26, 28) led to the often cited early 20th - century warming in the global mean (1910 — 1940) of 0.4 °C (Fig. 2), but it happened to occur during a period of increasing mean solar irradiance, leading some to attribute it, incorrectly, to solar forcing (42).

Wu et al. (7, 8) pointed out the importance of this mode in the modern global temperature record with a period of 65 y: If it is interpreted as natural and related to the Atlantic Multidecadal Oscillation (AMO)(9 ⇓ ⇓ — 12), then the trend attributed to anthropogenic warming should be significantly reduced after ∼ 1980, when the AMO was in a rising phase.

The IPCC compared the recent global warming rate with global warming rate for a longer period that has a combination this recent warming and previous global cooling phase and declared to the world «accelerated warming.»

Dissenters say we are seeing the end of a warming phase and we may be entering a cooler period.

He cited periods of warming during the Roman Empire and in the Middle Ages — when Vikings grew crops on Greenland — and cooler phases such as the Dark Ages and the Little Ice Age from 1300 to 1850.

The models heavily relied upon by the Intergovernmental Panel on Climate Change (IPCC) had not projected this multidecadal stasis in «global warming»; nor (until trained ex post facto) the fall in TS from 1940 - 1975; nor 50 years» cooling in Antarctica (Doran et al., 2002) and the Arctic (Soon, 2005); nor the absence of ocean warming since 2003 (Lyman et al., 2006; Gouretski & Koltermann, 2007); nor the onset, duration, or intensity of the Madden - Julian intraseasonal oscillation, the Quasi-Biennial Oscillation in the tropical stratosphere, El Nino / La Nina oscillations, the Atlantic Multidecadal Oscillation, or the Pacific Decadal Oscillation that has recently transited from its warming to its cooling phase (oceanic oscillations which, on their own, may account for all of the observed warmings and coolings over the past half - century: Tsoniset al., 2007); nor the magnitude nor duration of multi-century events such as the Mediaeval Warm Period or the Little Ice Age; nor the cessation since 2000 of the previously - observed growth in atmospheric methane concentration (IPCC, 2007); nor the active 2004 hurricane season; nor the inactive subsequent seasons; nor the UK flooding of 2007 (the Met Office had forecast a summer of prolonged droughts only six weeks previously); nor the solar Grand Maximum of the past 70 years, during which the Sun was more active, for longer, than at almost any similar period in the past 11,400 years (Hathaway, 2004; Solankiet al., 2005); nor the consequent surface «global warming» on Mars, Jupiter, Neptune's largest moon, and even distant Pluto; nor the eerily - continuing 2006 solar minimum; nor the consequent, precipitate decline of ~ 0.8 °C in TS from January 2007 to May 2008 that has canceled out almost all of the observed warming of the 20th cePeriod or the Little Ice Age; nor the cessation since 2000 of the previously - observed growth in atmospheric methane concentration (IPCC, 2007); nor the active 2004 hurricane season; nor the inactive subsequent seasons; nor the UK flooding of 2007 (the Met Office had forecast a summer of prolonged droughts only six weeks previously); nor the solar Grand Maximum of the past 70 years, during which the Sun was more active, for longer, than at almost any similar period in the past 11,400 years (Hathaway, 2004; Solankiet al., 2005); nor the consequent surface «global warming» on Mars, Jupiter, Neptune's largest moon, and even distant Pluto; nor the eerily - continuing 2006 solar minimum; nor the consequent, precipitate decline of ~ 0.8 °C in TS from January 2007 to May 2008 that has canceled out almost all of the observed warming of the 20th ceperiod in the past 11,400 years (Hathaway, 2004; Solankiet al., 2005); nor the consequent surface «global warming» on Mars, Jupiter, Neptune's largest moon, and even distant Pluto; nor the eerily - continuing 2006 solar minimum; nor the consequent, precipitate decline of ~ 0.8 °C in TS from January 2007 to May 2008 that has canceled out almost all of the observed warming of the 20th century.

When the phase of natural variability is taken into account, the model 15 - year warming trends in CMIP5 projections well estimate the observed trends for all 15 - year periods over the past half - century.

If the global climate temperature trend is positive, as one might expect during the warming phase of an interglacial period, then humankind will be best served by adapting as the alternative would seem to be unrealistic.

About 10 million years into the current period, the Cenozoic Era, the Earth went through a relatively rapid warming phase, which lasted for about 150,000 years and spiked global temperatures by an extra 5 ° C (9 ° F).