Sentences with phrase «background levels»

In some areas, the saturation levels reached at least 250 times that of background levels in the summer and 1,400 times higher in the winter.

At some locations, methane concentrations reached 100 times background levels.

There are usually several such plots on one site, some with elevated CO2 and a number of control plots in which CO2 remains at normal background levels.

The above paper further stated that studies had detected seismic waves from wind turbines that were above background levels to distances up to 18 km.

The arsenic spikes were transient, and returned to acceptable background levels by the time the water was extracted for use farther away.

They found thousands of places with air concentrations significantly above the 2 parts per million background level typically found in cities, with some areas as high as 100 ppm.

We determine typical trail lengths for sink pixels of different depths at various background levels.

In some areas, the saturation levels reached more than 250 times that of background levels in the summer and 1,400 times higher in the winter.

Consequently a higher background level of CO2 will reduce the [albeit marginal] effect of these CO2 troughs.

«This method has a very low background level, which allows for higher confidence in the results obtained.

But during one 60 - Martian - day episode, the rover sniffed out 10 times as much methane as background levels, finding about 7 parts per billion of the gas.

As we approached a corner that was home to a Pentecostal church and a pair of liquor stores, the methane concentrations rose to four parts per million, more than twice background levels.

By early August, concentrations decreased until they returned to background levels when normal oxygen conditions returned in late September.

A team from the University of Zagreb found concentrations of cadmium two hundred times higher than background levels around a munitions dump near Ojutin.

The realisation that there was a stable background level meant the challenge of measuring the increase might not be so great.

A team from Fukushima University recently mapped radiation levels at 370 spots in the prefecture and, using weather balloons, confirmed that atmospheric radiation levels have dropped to near background levels.

Every 2 weeks, the team measured blood levels of a stress hormone called cortisol; they sampled quickly, before the stress of capture changed background levels.

Dissolved methane is not toxic, and drinking water often contains significant background levels of the gas from natural sources.

He says the current background levels of around 100 milligrams per litre will increase as more salt diffuses through the ground.

But a balloon - borne detector flying over Antarctica called the Advanced Thin Ionization Calorimeter (ATIC) has detected 70 more high - energy electrons than the normal background level attributed to supernova blasts.

For some markers, acceptable limits might have to be individualized, since lifestyle factors can influence background levels,» says Robin Myte, doctoral student at Umeå University and one of the researchers behind the study.

As expected, treatment of HV cultures with PD173034 suppresses background levels of PrEn differentiation at the level of Gata6 and Nanog transcription (Figure 6A).

Furthermore, as pointed out by Frame et al. (2005), the effect of noise on the estimate of the climatic background level can lead to a substantial underestimate of uncertainties if not taken into account.

Parental HB1.F3 NSCs showed only background levels of green fluorescence and tumor sections from mice injected with these NSCs did not exhibit the green cobblestone pattern associated with membrane - bound antibody.

I wonder whether or not Nintendo will offer up the ability to choose different background levels.

Another way is to rely on the fact that volcanic aerosols only persist in the atmosphere for a couple of years, so we can get a good estimate of the non-volcanic background level by computing 10 - point moving averages which leave out the two highest values.

«The global warming influence provides a new background level that increases the risk of future enhancements in hurricane activity,» Trenberth says.

In northern mid-latitudes during summer, the zonal average increases near the surface are about 30 ppb or more, raising background levels to nearly 80 ppb, threatening attainment of air quality standards over most metropolitan and even rural regions, and compromising crop and forest productivity.

Another study has found that idling vehicles do create serious pollution: «The concentration of air pollutants near schools may significantly exceed community background levels, particularly in the presence of idling school buses.»

Stage light and stage light mono remove the entire background level and make it black while attempting to capture the person in the foreground.

The research team found anthropogenic noise doubled background sound levels in 63 percent of U.S. protected areas, and caused a ten-fold or greater increase in background levels in 21 percent of protected areas.

The new regulations will mean that, depending on the final rule, 76 % to 96 % of the country — including some national parks where the natural background levels for ozone are 65 to 67 parts per billion — will be out of compliance.

With the high background level of polymorphism, postmortem changes in the DNA can make sequences from long - dead animals hard to align with those of freshly sampled ones.

In cavitation experiments with deuterated acetone, tritium decay activity above background levels was detected.

Permafrost Permafrost Holds Twice as Much GHGs as Previously Thought: Over 1500 Billion Tons of CO2 and Methane Canada's Permafrost Has Moved 80 Miles North in Past 50 Years Methane More Methane Discovered Bubbling From Arctic Sea Floor - 1000 Times Background Levels in Places Major Source of Atmospheric Methane Identified Near Arctic Lakes