Sentences with phrase «observed cooling trend»

Although Doran and co-workers believe that the observed cooling trend is associated with decreased wind flow over the areas that were studied, they are unsure what may have caused wind velocity to decrease.

In addition, the data provide no clues about whether the observed cooling trend is likely to continue in the future.

Such events have been occurring in both hemispheres so it is likely that the observed cooling trend is occurring at both poles.

However, as noted above, the ISPM did not even mention stratospheric trends at first, and only peripherally in the second version, but still without explicit mention of the observed cooling trend [ISPM 2.1 c].

We observe a cooling trend from 1 to 1800 ce that is robust against explicit tests for potential biases in the reconstructions.

Not exact matches

The fact that the observed long term trend shows warming strongly suggests that there isn't an underlying long term cooling trend and the overall warming is unlikely to be due to natural variability.

Over the period 1984 — 2006 the global changes are 0.28 °C in SST and − 9.1 W m − 2 in Q, giving an effective air — sea coupling coefficient of − 32 W m − 2 °C − 1... [D] iminished ocean cooling due to vertical ocean processes played an important role in sustaining the observed positive trend in global SST from 1984 through 2006, despite the decrease in global surface heat flux.

They observed a Holocene cooling trend in the Antarctic of -0.26 to -0.40 degrees C / millennium for the past 1900 years prior to present day warming of the most recent 200 years.

411 SG Bolstrom, I am observing a particular trend unlike the recent past, whereas the Arctic air profiles are leaning more adiabatically during winter, this means a whole lot of confusion with respect to temperature trends, namely the high Upper Air should cool as the surface warms, and the reverse, the Upper air warms when heat from the lower atmosphere is transferred upwards.

One thing I would have liked to see in the paper is a quantitative side - by - side comparison of sea - surface temperatures and upper ocean heat content; all the paper says is that only «a small amount of cooling is observed at the surface, although much less than the cooling at depth» though they do report that it is consistent with 2 - yr cooling SST trend — but again, no actual data analysis of the SST trend is reported.

Here we analyze a series of climate model experiments along with observational data to show that the recent warming trend in Atlantic sea surface temperature and the corresponding trans - basin displacements of the main atmospheric pressure centers were key drivers of the observed Walker circulation intensification, eastern Pacific cooling, North American rainfall trends and western Pacific sea - level rise.

However, the albedo - induced cooling effect is expected to be small and was not detected in observed trends in the study by Matthews et al. (2004).

Statistical studies have debated the correlation between retreating Arctic ice and the negative NAO because it generates a confounding short term warming trend that is contradicted by the longer cooling trend suggested for the LIA as well as observed during the 1960s and 70s.

Boudu says: August 14, 2011 at 2:12 am Are there records of the frequency and intensity of tropical thunderstorms and do they correlate with the observed warming and cooling trends seen in the temperature records?

My opinion expressed elsewhere is that almost all the temperature changes we observe over periods of less than a century are caused by cyclical changes in the rate of energy emission from the oceans with the solar effect only providing a slow background trend of warming or cooling for several centuries at a time.

This unique feature of the Antarctic atmosphere has been shown to result in a negative greenhouse effect and a negative instantaneous radiative forcing at the top of the atmosphere (RFTOA: INST), when carbon dioxide (CO2) concentrations are increased, and it has been suggested that this effect might play some role in te recent cooling trends observed over East Antarctica.

-- The third, being the observed destabilization of the geosphere due to both the pace of terrestrial ice loss and relatively sudden and uneven climatic redistribution of the oceans» mass, with a consequent rise in seismic events and in volcanoes» cooling sulphate emissions, which have (according to Prof. McGuire, adviser to Munich Re on vulcanism risks) accelerated slowly on a 1.25 % / yr trend over the last 30 years.

«the cooling trend observed since 1940 is real enough... but not enough is known about the underlying causes to justify any sort of extrapolation,» and «by the turn of the century, enough carbon dioxide will have been put into the atmosphere to raise the temperature of earth half a degree.»

Given the considerable technical challenges involved in adjusting satellite - based estimates of TLT changes for inhomogeneities [Mears et al., 2006, 2011b], a residual cool bias in the observations can not be ruled out, and may also contribute to the offset between the model and observed average TLT trends.»

... [M] ost of the trends observed since satellite climate monitoring began in 1979 CE can not yet be distinguished from natural (unforced) climate variability, and are of the opposite sign [cooling] to those produced by most forced climate model simulations over the same post-1979 CE interval.»

Secondly, one could observe when each data set changed from a positive (i.e. warming) linear trend to a negative (i.e. cooling) linear trend.

When you add in the temperature trend during this time of year (slight cooling though the northern Midwest, warming across the Southwest), you get a pattern much like that observed during 2018.

What this means is that because (a) the land surface temperature record does in fact combine temperature measurements of light wind and windy nights and (b) there has been a reduction in nighttime cooling, the long - term temperature record may be contaminated by a warm bias that accentuates the observed trend of warmer temperatures.

The observed current U.S. cooling trend is not a prediction, but it does indicate that the continental landmass is affected by powerful, non-CO2 greenhouse gas factors that may continue for the near future.

There sea ice was not reduced and surface temperatures average 5 to 10 ° cooler, and the steep winter warming trend was not observed.

Second, a series of mildly explosive volcanoes, which increased stratospheric particles, likely had more of a cooling effect than previously recognized.35, 36,37 Third, the high incidence of La Niña events in the last 15 years has played a role in the observed trends.29, 38 Recent analyses13 suggest that more of the increase in heat energy during this period has been transferred to the deep ocean than previously.

A cooling trend is observed in the raw and USHCN V2 records for the past 12 years... In both the short and longer term cases the USHCN V2 adjusted data yielded trends that were roughly 1ºC per century higher than those found in the raw temperature records.»

In fact it is more likely that observed changes in the trend of global temperature will be the first and simplest indication as to when a global shift from solar / oceanic warming mode to solar / oceanic cooling mode and vice versa has occurred.

Beside of this I will note that even if the supposed prevail of CO2 concentrations over the aerosols was true, we will observe at least some «noise» of cooling in the main trend that will be related to the industrialization of the third world at the beginning of 90's.

Looking at the longer - term trend (since 1850), it is likely that around half of the observed warming of 0.7 °C (rather than 93 % as assumed by IPCC) can be attributed to GHGs, although it is hard to see how the observed multi-decadal 30 - year warming and cooling cycles could have anything to do with GHGs.

If in general natural trends were, all else equal, causing the overwhelming majority of heating and GHG a minority, but some temporary identified factor caused cooling, this strange inummerate way of speaking would allow you to say more than 50 % of the observed warming is caused by GHG.

Conclusion not supported with data referenced in Section 3.2; specifically the conclusion «Significant decal trend differences were observed between compliant CRS stations and compliant MMTS stations, with MMTS stations generally being cooler, confirming what was observed in Menne et al (2010)».

According to one of the statisticians, the fact that you have to choose 1998 as your starting point in order to observe a (statistically insignificant) cooling trend is part of the problem.

The observed recent warming hiatus, defined as the reduction in GMST trend during 1998 — 2012 as compared to the trend during 1951 — 2012, is attributable in roughly equal measure to a cooling contribution from internal variability and a reduced trend in external forcing (expert judgement, medium confidence).

Since 1912, a weather station there has observed an overall cooling trend.

«n summary, the observed recent warming hiatus, defined as the reduction in GMST trend during 1998 — 2012 as compared to the trend during 1951 — 2012, is attributable in roughly equal measure to a cooling contribution from internal variability and a reduced trend in external forcing (expert judgment, medium confidence).

My estimate is that between ~ 80 % to 120 % of the observed trend in recent decades is human - forced — i.e. which allows for 0.1 to 0.2 degC / dec either way for internal variability — natural forcings are a slight cooling factor on these timescales so that would imply a higher attribution to human causes.

Superimposed on the secular trend is a natural multidecadal oscillation of an average period of 70 y with significant amplitude of 0.3 — 0.4 °C peak to peak, which can explain many historical episodes of warming and cooling and accounts for 40 % of the observed warming since the mid-20th century and for 50 % of the previously attributed anthropogenic warming trend (55).

Leaving lag effects observed in the glacial — interglacial records aside, explain how using GISP2 data we have a ~ 7 - 9000 year cooling trend with a 3 C drop, while using Epic CO2 data CO2 was increasing from 260 - 280?

-LCB- 9.4, Box 9.2 -RCB- • The observed reduction in surface warming trend over the period 1998 to 2012 as compared to the period 1951 to 2012, is due in roughly equal measure to a reduced trend in radiative forcing and a cooling contribution from natural internal variability, which includes a possible redistribution of heat within the ocean (medium confidence).

Eventually the surface will cool sufficiently to produce an observed reversion of the warming trend that increased the level of «humidity».

At the precise moment when the tree - ring proxies and actual temperatures are in near perfect agreement on a decades - long cooling trend, Mann dumps the tree rings and moves to «observed temperatures» - which have been conveniently revised upward from when they were originally observed.