Sentences with phrase «air temperature trends in»

Summary: The paper concluded that between 1880 and 2002, surface air temperature trends in China were strongly influenced by natural variations in solar intensity.

Not exact matches

With documented warmer air temperatures in eastern Canada since the 1970s, there has been a trend of earlier ice melting and less ice in general, explained Lavery.

They estimate that, across about 60 % of the global vegetated area, greening has buffered warming by about 14 %; for the remaining areas, which mostly include boreal zones, LAI trends have amplified the raise in air temperatures, leading to an additional warming of about 10 %.

Researchers found an overall warming trend in air temperature of 0.023 C (0.041 F) per year, and in water temperature of 0.028 C (0.050 F) per year over 51 years.

A 2000 - year - long Arctic cooling trend seen in a surface air temperature reconstruction was reversed during the last century.

This is the rise in air temperature expected by the year 2040, if current trends in the use of fossil fuels and forest - burning continue.

Despite the strong warming trend of the past 15 years, worldwide temperatures have risen less than models predict, given the build - up of carbon dioxide in the air to 25 per cent above pre-industrial levels.

Complementary information to the Arctic warming analysis would be using DWT's of the few left Upper Air stations in the Circumpolar zone and crunch up temperature trends of the entire atmosphere, when variances from year to year are very small, but are mostly for the warmer.

To remove this difference in magnitude and focus instead on the patterns of change, the authors scaled the vertical profiles of ocean temperature (area - weighted with respect to each vertical ocean layer) with the global surface air temperature trend of each period.

Note that the temperature profiles have been scaled relative to the global surface air temperature (SAT) trend in each simulation.

Figure 4 - Spatial variability of the sea surface temperature (SST) trends scaled with the global surface air temperature (SAT) trend for each simulation used in the study.

Figure 1 - Sea surface temperature trends scaled with global surface air temperature trends for half the climate models used in the study.

This animation shows how the same temperature data (green) that is used to determine the long - term global surface air warming trend of 0.16 °C per decade (red) can be used inappropriately to «cherrypick» short time periods that show a cooling trend simply because the endpoints are carefully chosen and the trend is dominated by short - term noise in the data (blue steps).

A compilation of surface measurements of downward longwave radiation from 1973 to 2008 find an increasing trend of more longwave radiation returning to earth, attributed to increases in air temperature, humidity and atmospheric carbon dioxide (Wang 2009).

Back in 2008, a cottage industry sprang up to assess what impact the Thompson et al related changes would make on the surface air temperature anomalies and trends — with estimates ranging from complete abandonment of the main IPCC finding on attribution to, well, not very much.

Complementary information to the Arctic warming analysis would be using DWT's of the few left Upper Air stations in the Circumpolar zone and crunch up temperature trends of the entire atmosphere, when variances from year to year are very small, but are mostly for the warmer.

The disparity between surface and upper air trends in no way invalidates the conclusion that surface temperature has been rising.»

The aspect of the paper that has attracted the most attention is the claim that the retreat of the Kilimanjaro summit glaciers can be explained by precipitation reduction, without any compelling need to invoke a warming trend in local air temperature.

There is a difference between peaks and valleys in noisy processes (1998 surface air temperature, 2007 record minimum ice, or shipping at a few small areas on the edges of the Arctic ocean) and CO2 forcing driven trends, especially when different measures.

The rate and magnitude of 20th century warming are thus unknowable, and suggestions of an unprecedented trend in 20th century global air temperature are unsustainable.

«We show that the climate over the 21st century can and likely will produce periods of a decade or two where the globally averaged surface air temperature shows no trend or even slight cooling in the presence of longer - term warming,» the paper says, adding that, «It is easy to «cherry pick» a period to reinforce a point of view.»

Glaciers and ice caps in Arctic Canada are continuing to lose mass at a rate that has been increasing since 1987, reflecting a trend towards warmer summer air temperatures and longer melt seasons.

Re 9 wili — I know of a paper suggesting, as I recall, that enhanced «backradiation» (downward radiation reaching the surface emitted by the air / clouds) contributed more to Arctic amplification specifically in the cold part of the year (just to be clear, backradiation should generally increase with any warming (aside from greenhouse feedbacks) and more so with a warming due to an increase in the greenhouse effect (including feedbacks like water vapor and, if positive, clouds, though regional changes in water vapor and clouds can go against the global trend); otherwise it was always my understanding that the albedo feedback was key (while sea ice decreases so far have been more a summer phenomenon (when it would be warmer to begin with), the heat capacity of the sea prevents much temperature response, but there is a greater build up of heat from the albedo feedback, and this is released in the cold part of the year when ice forms later or would have formed or would have been thicker; the seasonal effect of reduced winter snow cover decreasing at those latitudes which still recieve sunlight in the winter would not be so delayed).

One simply can not do arithmetic (least squares trends) on the temperature of environmental air and expect the result to reflect the changes in heat content.

The oceans may be warming and air temperatures rising, but in recent days Iceland has bucked the global climate trend.

For example: Comparison of trends and low - frequency variability in CRU, ERA - 40, and NCEP / NCAR analyses of surface air temperature, Simmons et al, JGR 2004

Kevin Trenberth is now arguing that the reason observed air temperature trends don't match modeled trends is because of «missing heat» in the oceans.

Although the rate of warming of surface air and lower troposphere temperatures appear to have slowed over the past few years, the same could be said at any virtually any point in time by cherrypicking short - term noise and ignoring the long - term trend (Figure 2).

Canadian Ice Service, 4.7, Multiple Methods As with CIS contributions in June 2009, 2010, and 2011, the 2012 forecast was derived using a combination of three methods: 1) a qualitative heuristic method based on observed end - of - winter arctic ice thicknesses and extents, as well as an examination of Surface Air Temperature (SAT), Sea Level Pressure (SLP) and vector wind anomaly patterns and trends; 2) an experimental Optimal Filtering Based (OFB) Model, which uses an optimal linear data filter to extrapolate NSIDC's September Arctic Ice Extent time series into the future; and 3) an experimental Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere and sea ice predictors.

[G] etting the [monsoon] forecast right remains a challenge, thanks to the complex — and still poorly understood — ways in which South Asia's monsoon rains are influenced by everything from atmospheric and ocean temperatures to air quality and global climate trends.

For example, climate researchers use only night - time marine air temperatures, as day - time records are too erratic.Changes in the local environment may also introduce erroneous trends.

I've been looking at the Hansen material which involves tropical oceans and have had occasion to review some of the temperature data sets, including Agudelho and Curry, which is an interesting and useful comparison of satellite and surface trends — a topic in the air from the US CCSP report.

Snowfall varies across the region, comprising less than 10 % of total precipitation in the south, to more than half in the north, with as much as two inches of water available in the snowpack at the beginning of spring melt in the northern reaches of the river basins.81 When this amount of snowmelt is combined with heavy rainfall, the resulting flooding can be widespread and catastrophic (see «Cedar Rapids: A Tale of Vulnerability and Response»).82 Historical observations indicate declines in the frequency of high magnitude snowfall years over much of the Midwest, 83 but an increase in lake effect snowfall.61 These divergent trends and their inverse relationships with air temperatures make overall projections of regional impacts of the associated snowmelt extremely difficult.

There has been no material trend in surface air temperature during the last 10 years when taken in isolation, but 13 of the 14 warmest years on record have occurred since 1995.

These issues, which are either not recognized at all in the assessments or are understated, include: - the identification of a warm bias in nighttime minimum temperatures - poor siting of the instrumentation to measure temperatures - the influence of trends in surface air water vapor content on temperature trends - the quantification of uncertainties in the homogenization of surface temperature data, and the influence of land use / land cover change on surface temperature trends.

The scenarios that scientists are looking at depend on measurements of air and water temperatures taken at hundreds of sites around the world, as well as complex models about how trends will evolve in the coming decades.

Surface warming: «Global temperature evolution: recent trends and some pitfalls» «Coverage bias in the HadCRUT4 temperature series and its impact on recent temperature trends» «Recently amplified arctic warming has contributed to a continual global warming trend» «On the definition and identifiability of the alleged «hiatus» in global warming» «Global land - surface air temperature change based on the new CMA GLSAT dataset»

For example, let's say that evidence convinced me (in a way that I wasn't convinced previously) that all recent changes in land surface temperatures and sea surface temperatures and atmospheric temperatures and deep sea temperatures and sea ice extent and sea ice volume and sea ice density and moisture content in the air and cloud coverage and rainfall and measures of extreme weather were all directly tied to internal natural variability, and that I can now see that as the result of a statistical modeling of the trends as associated with natural phenomena.

It is that whilst there is ice to melt, temperature of either air or water in that region will NOT show any particular trend.

To further quantify this effect, whether or not my reasoning is objected too, then at the very least, a correlation over the period of the air temperature trend needs to be carried out against surface sea temperature anomalies in both the Northern Atlantic and N Pacific.

Surface measurements of downward longwave radiation A compilation of surface measurements of downward longwave radiation from 1973 to 2008 find an increasing trend of more longwave radiation returning to earth, attributed to increases in air temperature, humidity and atmospheric carbon dioxide (Wang 2009).

For the US MIDWEST, the air masses from the Pacific first have to pass more than a thousand kilometres of mountains and thus the temperature trends in the US Midwest have unusually little noise from ocean air temperature trends.

In Fig 22 you state that «air masses from the Pacific first have to pass more than a thousand kilometres of mountains and thus the temperature trends in the US Midwest have unusually little noise from ocean air temperature trends.&raquIn Fig 22 you state that «air masses from the Pacific first have to pass more than a thousand kilometres of mountains and thus the temperature trends in the US Midwest have unusually little noise from ocean air temperature trends.&raquin the US Midwest have unusually little noise from ocean air temperature trends.»

Canadian Ice Service; 5.0; Statistical As with Canadian Ice Service (CIS) contributions in June 2009 and June 2010, the 2011 forecast was derived using a combination of three methods: 1) a qualitative heuristic method based on observed end - of - winter Arctic Multi-Year Ice (MYI) extents, as well as an examination of Surface Air Temperature (SAT), Sea Level Pressure (SLP) and vector wind anomaly patterns and trends; 2) an experimental Optimal Filtering Based (OFB) Model which uses an optimal linear data filter to extrapolate NSIDC's September Arctic Ice Extent time series into the future; and 3) an experimental Multiple Linear Regression (MLR) prediction system that tests ocean, atmosphere, and sea ice predictors.

On my religion: I am honest when I say to you that there seem to be no warming in areas over land in areas where ocean air do not dominate temperature trends, then its true.

This study, which was supported by the U.S. National Science Foundation, is the first to analyze long - term trends in rainfall and surface air temperature over a timescale of nearly an entire century, the study's lead author, Natalie Thomas, a doctoral candidate in atmospheric and oceanic science at the University of Maryland, told Live Science.

Fig6 However, the valley stations in best possible shelter against ocean air (OAS) have all been adjusted by ZAMG to show warm temperature trends.

However, despite this, the team reckon to have perhaps isolated a «global warming» signal in the accelerated run off of the Greenland Ice Mass — but only just, because the runoff at the edges is balanced by increasing central mass — again, they focus upon recent trends — a net loss of about 22 cubic kilometres in total ice mass per year which they regard as statistically not significant — to find the «signal», and a contradiction to their ealier context of air temperature cycles.

Thirty years is far too short to encompass a cycle for the Arctic sea ice where the major cycle is at least 70 years — the best cycle context for this I have found is represented in the State of the Arctic Report or the work of Igor Polyarkov at IARC Fairbanks — looking at Surface Air Temperature trends for the whole Arctic — 60 - 90N, for the century you can see two peaks in 1940 and 2005 with a trough in the mid-80s (if anyone can tell me how to copy in a jpg I could put one in here!).

I'm inclined to think that Ocean Heat Content, trends in land ice and Sea levels are more appropriate indicators of global climate change than surface air temperatures, but that's another issue.