Sentences with phrase «increase in warmer periods»

Not exact matches

Sevigny said as social media continues to increase its presence with public commentary on matters such as Question Period — which doesn't just rely on mainstream media for coverage anymore in a sea of tweets — it may lead to a change in behaviour of MPs as they attempt to come across in a warmer light to a broader reporting audience.

There is no evidence for significant increase of CO2 in the medieval warm period, nor for a significant decrease at the time of the subsequent little ice age.

For a start, observational records are now roughly five years longer, and the global temperature increase over this period has been largely consistent with IPCC projections of greenhouse gas — driven warming made in previous reports dating back to 1990.

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.

What happens when the world moves into a warm, interglacial period isn't certain, but in 2009, a paper published in Science by researchers found that upwelling in the Southern Ocean increased as the last ice age waned, correlated to a rapid rise in atmospheric carbon dioxide.

In a paper published this month in Geophysical Research Letters, Lovejoy concludes that a natural cooling fluctuation during this period largely masked the warming effects of a continued increase in human - made emissions of carbon dioxide and other greenhouse gaseIn a paper published this month in Geophysical Research Letters, Lovejoy concludes that a natural cooling fluctuation during this period largely masked the warming effects of a continued increase in human - made emissions of carbon dioxide and other greenhouse gasein Geophysical Research Letters, Lovejoy concludes that a natural cooling fluctuation during this period largely masked the warming effects of a continued increase in human - made emissions of carbon dioxide and other greenhouse gasein human - made emissions of carbon dioxide and other greenhouse gases.

Over the last decade, rock avalanches and landslides have become more common in high mountain ranges, apparently coinciding with the increase in exceptionally warm periods (see «Early signs»).

During the warm period, the core also shows a large increase in organic matter from plants growing in and around the lake.

«This effect could add up in future warm periods and thus weaken the convection — especially with regard to the rising temperatures and increased melting,» the oceanographer concludes.

«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.

By studying the relationship between CO2 levels and climate change during a warmer period in Earth's history, the scientists have been able to estimate how the climate will respond to increasing levels of carbon dioxide, a parameter known as «climate sensitivity».

«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.»

«This effect could add up in future warm periods and thus weaken the convection - especially with regard to the rising temperatures and increased melting», the oceanographer concludes.

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.

Bacteria, however, have remained Earth's most successful form of life — found miles deep below as well as within and on surface rock, within and beneath the oceans and polar ice, floating in the air, and within as well as on Homo sapiens sapiens; and some Arctic thermophiles apparently even have life - cycle hibernation periods of up to a 100 million years while waiting for warmer conditions underneath increasing layers of sea sediments (Lewis Dartnell, New Scientist, September 20, 2010; and Hubert et al, 2010).

As a consequence, their results are strongly influenced by the low increase in observed warming during the past decade (about 0.05 °C / decade in the 1998 — 2012 period compared to about 0.12 °C / decade from 1951 to 2012, see IPCC 2013), and therewith possibly also by the incomplete coverage of global temperature observations (Cowtan and Way 2013).

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.

Over the last decade, rock avalanches and landslides have become more common in high mountain ranges, apparently coinciding with the increase in exceptionally warm periods.

Periods of volcanism can cool the climate (as with the 1991 Pinatubo eruption), methane emissions from increased biological activity can warm the climate, and slight changes in solar output and orbital variations can all have climate effects which are much shorter in duration than the ice age cycles, ranging from less than a decade to a thousand years in duration (the Younger Dryas).

The results the team found are that human - induced climate change is intensifying both the heat in the Arctic and increasing the frequency of such unusually warm periods.

We assess the heat content change from both of the long time series (0 to 700 m layer and the 1961 to 2003 period) to be 8.11 ± 0.74 × 1022 J, corresponding to an average warming of 0.1 °C or 0.14 ± 0.04 W m — 2, and conclude that the available heat content estimates from 1961 to 2003 show a significant increasing trend in ocean heat content.

An implicit corollary is that in the intervening period the radiative output has been increasing, with a consequent warming of the Earth.

For example, one model reaches 38 percent of the maximum warming in the first decade after a step increase in CO2 concentration, while another model reaches 61 percent of the maximum warming in this time period.

Zooming in on the period after 1970, one sees a record of largely unabated warming, with temperatures increasing steadily accompanied by some short - term variability driven by El Niño and La Niña events, and also by major volcanic eruptions like Pinatubo in 1992.

The average flood height increased by about 4 feet in New York between the two time periods and with continued warming, larger and more extreme storms along with even higher sea level is likely to cause more frequent and intense flooding.

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.

The continued forcing from CO2 over this period is substantial, not to mention «warming in the pipeline» from late 20th century increase in CO2.

What is shockingly ill - advised to me is that the Pielke and McIntyre projections both required, in order to fit with their hoped for story line, that the adjustments not only affect the period from 1945 to 1960, but also extend beyond that into the late 90s, in order to level the more recent temperature increases so as to both make the rate appear less dramatic and the amount of recent, CO2 forced warming less of a concern.

GHG continue to increase in amounts in the atmosphere and as such, over time more warming inevitably continues though there may be breaks for short periods, and some cooling, as already discussed at great length regarding aerosols.

Kevin, Yes, I did mention that there were periods of increased and decreased warming in the real world.

[Response: Solar activity increased during that period, and of course greenhouse gases were also already on the rise — in fact already in the 1930s Callendar attributed warming to rising CO2 in the air.

Item 8 could be confusing in having so many messages: «It is extremely likely that more than half of the observed increase in global average surface temperature from 1951 to 2010 was caused by the anthropogenic increase in greenhouse gas... The best estimate of the human - induced contribution to warming is similar to the observed warming over this period....

nj: CO2 levels increased from approximately 1900 — 1940 so indisputably had some role in that warming period.

Our results support previous findings of a reduced rate of surface warming over the 2001 — 2014 period — a period in which anthropogenic forcing increased at a relatively constant rate.»

CO2 levels increased from approximately 1900 — 1940 so indisputably had some role in that warming period.

A globally warm medieval period could be a simple forced response to increased solar, in which case it doesn't imply any larger intrinsic variability than already assumed, and since solar has been pretty much constant over the last 50 years, improvements to our understanding of solar forced climate changes are irrelevant for the last few decades.

You provide no evidence of some substantial increase in volcanic and / or earthquake activity in the global warming period since 1900, or the more recent global warming period of since 1970.

Northern Hemisphere mean temperatures do appear to have cooled over that period, and that contrasts with a continuing increase in CO2, which if all else had been equal, should have led to warming.

With warmer SSTs, I would imagine there will be more storms like Wilma that will increase their intensity from TS to cat 4/5 level in a very short period of time.

In order to make the trends comparable despite the different periods and CO2 increases, they were divided by the globally averaged warming trend, i.e. all values above 1 show an above - average warming (orange - red), values below 1 a below - average warming, negative values a cooling.

Temperature increases in the two warming periods are of a similar magnitude, however, the rate of warming in 1920 — 1930 was about 50 % higher than that in 1995 — 2005.»

Perhaps you are unaware of the progress that has been made in attribution during these periods to a combination of lower volcanism, increased insolation and increased greenhouse warming in the former period and to increased aerosols from fossil fuel burning in the latter.

But there was also a rapid rising temperature period between 1695 and 1736 when there would have been no measurable increases in CO2 and therefore human induced warming.

Our study is not about range change, but about a 10-fold increase in a key predator that is a native but has increased dramatically in abundance during a period of strong warming.

But the evidence shows this can't be true; temperature changes before CO2 in every record of any duration for any time period; CO2 variability does not correlate with temperature at any point in the last 600 million years; atmospheric CO2 levels are currently at the lowest level in that period; in the 20th century most warming occurred before 1940 when human production of CO2 was very small; human production of CO2 increased the most after 1940 but global temperatures declined to 1985; from 2000 global temperatures declined while CO2 levels increased; and any reduction in CO2 threatens plant life, oxygen production, and therefore all life on the planet.

Solar forcing has increased over the 20th century and given that the oceans have not yet had time to equilibrate to the new levels of forcing, it must have contributed some to the recent warming, in fact, that equlibration was further delayed by the cooling period, so the unrealized climate commitment would have been greater than ordinarily expected given that most of the increase in solar activity occurred in the first half of the century.

[T] he fire season for the Southern Rockies «has consistently increased from the 1970s from 31 days (1 month) to 117 days (4 months) due to warming over this period,» Tania Schoennagel, a research scientist at CU Boulder, wrote in an email to me.

It looks like a statistic artifact to me, maybe the infilling increased or decreased in that period with in - filled data being biased warm or biased cold and thus creating that issue.

My understanding of the viewpoint of the majority of experts in related fields is that analysis shows that relative to 50 years ago, and the LIA, and the MWP, average global temperatures are warmer, and increasing in warmth at an anomalous rate than indicated by the data on previous time periods, including the MWP.

As the temperature warms, CO2 is released into the atmosphere, hence the increase in CO2 levels during warmer periods in time.