Sentences with phrase «air samples measured»

«We've had about a 25 percent decrease in the number of air samples measured from the global cooperative network,» Dlugokencky told Live Science.

Not exact matches

The new Schmidt grant will allow the Scripps team to chip away at a years - long backlog of air samples to measure changes in the ratio of carbon isotopes, which provides information about manmade sources of CO2.

The team found that zapping mixtures of air with electricity, which simulates the chemistry of the upper atmosphere, could produce enriched levels of 15N15N like they measured in air samples.

P.E., Neelakshi Hudda and colleagues note that past research has measured pollution from air traffic before, but most of these studies only sampled air within a couple of miles, at most, from airports.

Cota immediately signed up for the study and learned how to use a particle counter, which measures particulates and toxins in the air, to take samples of ambient air quality surrounding her home.

This could include measures such as CT scanning, cellular and molecular markers taken from blood samples, sputum and exhaled air and microbiome anaylsis.

The researchers demonstrated the potential of this technique by using it to measure the presence and concentration of carbon dioxide in samples of air.

This weather balloon will mostly measure temperature, air pressure, and wind speed, but others sample the air for the concentration of various gases like carbon dioxide and oxygen.

«The methane concentrations were extraordinarily high, the highest we've seen in ambient samples,» said Blake, who has measured air pollutants across the globe for more than 30 years.

To monitor urban air quality, environmental agencies typically measure pollutant concentrations in samples collected at centralized outdoor locations and extrapolate individuals» average exposures from those measurements.

The large «metal dome» collects air samples for analysis of environmental pollutants, while the three small cylinders measure nitrogen dioxide (blue), sulfur dioxide (red) and ozone (white).

We can't measure actual captured air, as we do with ice core samples.

The article should have failed peer review and never been published: the scientist conducting the work titrated the samples in open air, effectively measuring not only the weak acids in the samples but also the carbon dioxide from the room.

During initial construction stages of project, we performed air leakage testing at a small sample of apartment units at intermediate stages of scope to assess success of implementation and help the contractor understand air sealing measures.

For five weeks we sampled air from the roof of the NOAA David Skaggs Research Center in hope of measuring air parcels contaminated with smoke from residential wood stoves.

Most interesting is that the about monthly variations correlate with the lunar phases (peak on full moon) The Helsinki Background measurements 1935 The first background measurements in history; sampling data in vertical profile every 50 - 100m up to 1,5 km; 364 ppm underthe clouds and above Haldane measurements at the Scottish coast 370 ppmCO2 in winds from the sea; 355 ppm in air from the land Wattenberg measurements in the southern Atlantic ocean 1925-1927 310 sampling stations along the latitudes of the southern Atlantic oceans and parts of the northern; measuring all oceanographic data and CO2 in air over the sea; high ocean outgassing crossing the warm water currents north (> ~ 360 ppm) Buchs measurements in the northern Atlantic ocean 1932 - 1936 sampling CO2 over sea surface in northern Atlantic Ocean up to the polar circle (Greenland, Iceland, Spitsbergen, Barents Sea); measuring also high CO2 near Spitsbergen (Spitsbergen current, North Cape current) 364 ppm and CO2 over sea crossing the Atlantic from Kopenhagen to Newyork and back (Brements on a swedish island Lundegards CO2 sampling on swedish island (Kattegatt) in summer from 1920 - 1926; rising CO2 concentration (+7 ppm) in the 20s; ~ 328 ppm yearly average

Science historians would point out that Professor Revelle did not prompt the first CO2 measurement in the atmosphere; what he prompted was the first sampling of air from locations around the world, and it was actually Harry Wexler, the head of the Weather Service at the time, who prompted and actually funded the start of the long - term monitoring program by David Keeling on Mauna Loa — so Revelle did play a very important role in stimulating observations (and in 1965 he chaired the panel on this issue that prepared a quite insightful appendix for the report of the President's Scientific Advisory Council), but Revelle was not the very first to urge CO2 be measured in the atmosphere.

Carbon dioxide was measured at the 400 parts per million level at six additional remote northern locations that are part of NOAA's international cooperative air sampling network at least once during the spring of 2012.

Top - down methods take air samples from aircraft or tall towers to measure gas concentrations remote from sources.

By far the best match was to the record of atmospheric carbon dioxide, measured from atmospheric samples and air trapped in polar ice.

Using the ARM Aerial Facility's (AAF) Gulfstream - 159 (G - 1) research aircraft, the team will fly three possible flight paths between Prudhoe Bay, Oliktok Point, Barrow, Atqasuk, Ivotuk, and Toolik Lake measuring carbon dioxide, methane, and carbon monoxide — also known as trace gases — using two different types of gas analyzers and collecting air samples of trace gases with a 12 - flask sampler.

The cloud condensation nuclei counter measures the concentration of aerosol particles by drawing an air sample through a column with thermodynamically unstable supersaturated water vapor that can condense onto aerosol particles.

Well, I was one of the first persons in the blogosphere at the time to evaluate that, because I compared the dip in the temperature of sampled water with the dip in the temperature of near - surface air measured on ships, and observed that approximately half or so of the dip was explainable by instrumentation changes and the remainder by some other mechanism — probably a change in internal ocean dynamics (PDO, AMO, etc..)

All I know is that CO2 can not be measured unless water vapour is removed from the air sample, but a device was patented in 1972 that side - lined this process.

In no way is this comparable to the manufacture of data where no measurements have been taken or the substitution of one measured variable (daily mean land air temperature) with another (instantaneous SST observations) whose sampling method varies, is exceedingly uneven geographically, and no credible, alias - free time - series can be obtained.

There was no difference in CO2 levels between still open pores, measured in sampled air and already closed pores, measured in the normal way of ice crushing.

The gradual but systematic rise of 1.5 degrees C is best explained by the record of atmospheric carbon dioxide, measured from atmospheric samples and air trapped in polar ice.

Indeed, the atmospheric CO 2 - concentrations are specified from IR gas analyzer measuring the amount of IR light absorbed in air samples (Keeling et al. 1976).

``... our lab measures CH4 [methane] in air samples collected from sites around the world, including the Arctic.

Measured groundwater levels in 566 wells on Robins Air Force Base, collected, and analyzed groundwater samples.

General Responsibilities: Conduct environmental site investigations, assessments and surveys to sample, measure and analyze air, water, material, and soil.