Sentences with phrase «dust emission»

The calculations can not «exclude the possibility of dust emission bright enough to explain the entire excess signal,» the team writes.

The 90 % confidence level is estimated to be ± 0.2 W m — 2, reflecting the uncertainty in total dust emissions and burdens and the range of possible anthropogenic dust fractions.

From this perspective, the model projections suggest that rainfall increases would not be sufficient to support sufficient vegetation to stop dust emission.

I work on high - resolution spectroscopy of molecular gas emission and on millimeter interferometry of dust emission from planet - forming disk regions.

These research findings offer new insight on the overall human health and air quality impacts of African dust, including the climate change - induced human health effects that are expected to occur from increased African dust emissions in the coming decades.

Zhang et al. (1997) estimated that about 800 Tg yr — 1 of Asian dust emissions are injected into the atmosphere annually, about 30 % of which is re-deposited onto the deserts and 20 % is transported over regional scales, while the remaining approximately 50 % is subject to long - range transport to the Pacific Ocean and beyond.

We aim at analyzing observations of the polarized dust emission by disentangling the effects on the polarization signal in the context of 3D radiative transfer simulations.

With higher frequencies swamped by dust emission and lower frequencies by another «foreground» called synchrotron radiation, 150 gigahertz sat at a sweet spot with minimal contamination.

The now hyper - arid Sahara desert was characterized by a lush extent of grass and consequently reduced dust emission due to changes in Earth's orbital parameters.

We aim to determine the level of near - infrared exozodiacal dust emission around a sample of 42 nearby main sequence stars with spectral types ranging from A to K and to investigate its correlation with various stellar parameters and with the presence of cold dust belts.

The contribution to global dust emission of desertification through human activities is uncertain: estimates vary from 50 % (Tegen et al., 1996; Mahowald et al., 2004) to less than 10 % (Tegen et al., 2004) to insignificant values (Ginoux et al., 2001; Prospero et al., 2002).

A dust enclosure minimises dust emissions.

However, in their journal article the authors note that the models they used to analyze their data «are not sufficiently constrained by external public data to exclude the possibility of dust emission bright enough to explain the entire excess signal».

For this purpose, we developed a code capable of simulating dust grain alignment of aspherical grains and intrinsical polarization of thermal dust emission.

We aim to determine the level of near - infrared exozodiacal dust emission around a sample of 42 nearby main sequence stars with... ▽ More (Abridged) Dust is expected to be ubiquitous in extrasolar planetary systems owing to the dynamical activity of minor bodies.

We have clearly detected FIR dust emission extended in the halo of the galaxy; there are two filamentary emission structures extending from the galactic disk up to 9 kpc in the northern and 6 kpc in the northwestern direct... ▽ More We present new far - infrared (FIR) images of the edge - on starburst galaxy NGC253 obtained with the Far - Infrared Surveyor (FIS) onboard AKARI at wavelengths of 90 um and 140 um.

We have clearly detected FIR dust emission extended in the halo of the galaxy; there are two filamentary emission structures extending from the galactic disk up to 9 kpc in the northern and 6 kpc in the northwestern direction.

The RF due to dust emission changes induced by circulation changes between 1750 and the present are difficult to quantify and not included here (see also Section 7.5).

The potentially large impact of climate change on dust emissions shows up in particular when comparing present - day with LGM conditions for dust erosion (e.g., Werner et al., 2002).

It may seem counterintuitive, he said, because «most people associate dust emission with aridity and deserts, not with precipitation.»

On the other hand, when wind direction is reversed (positive WF) acceleration through the venturi no longer exists, and surface - wind velocity rarely exceeds the wind threshold necessary for dust emission (Fig. 6).

First, wind blowing over uncovered coal stockpiles results in fugitive coal dust emissions that are a source of PM2.5.

But noise gets more ho - hum ratings, and allergy sufferers should note that they warn about dust emissions while vacuuming.

Field studies in southeastern Morocco, just a few kilometers away from the site of this dust storm, show that electric fields generated by blowing sand boost dust emissions up to 10 times more than expected from wind alone.

Future climate warming could lead to a re-greening of the southernmost Sahara (Sahel), with decreased dust emissions and changes in land cover.

«It is of paramount importance to account for changes in Saharan vegetation and dust emissions when simulating past climate change.

The angular power spectrum of polarized dust emission at intermediate and high galactic latitudes.

«When we first detected this signal in our data, we relied on models for Galactic dust emission that were available at the time,» says John Kovac, a principal investigator of BICEP2 at the Harvard - Smithsonian Center for Astrophysics in Cambridge, Massachusetts, in the ESA press release.

A cooperative study by the USDA - ARS and Washington State University researched the effects of growing oilseed crops — camelina and safflower — on blowing dust emissions.

Because dust grains align themselves with the magnetic field, the researchers were able to use dust emission to measure the field's geometry.

(c) An accretion disk model that can reproduce the observed dust emission in the disk.

Both light sources become brighter at higher frequencies, but dust emissions brightens more dramatically.

We compared the [CII] intensity map with the PAH and dust emission maps obtained by the AKARI satellite.

We deconvolved the cold and warm dust emission components spatially by making the best use of the multi-band photometric capability of the FIS.

3D radiative transfer of intrinsically polarized dust emission based on aligned aspherical grains

Such processes dominate over land use changes as defined above, which would give rise to anthropogenic dust emissions (Mahowald and Luo, 2003; Moulin and Chiapello, 2004; Tegen et al., 2004).

The second part of the dissertation analyzes dust emission in an atmospheric general circulation model (AGCM), where realistic simulation is inhibited by the model's coarse resolution compared to the scale of the circulations observed to mobilize dust.

The mechanistic representation of dust emission allows its simulation under different climates, where high resolution surface wind reanalyses are not available for tuning.

(b) Sources (S1 to S10) and typical depositional areas (D1 and D2) for Asian dust indicated by spring average dust emission flux (kg km — 2 per month) averaged over 1960 to 2002.

Perlwitz et al. (2001) estimate that this feedback reduces the global dust load by roughly 15 %, as dust radiative forcing reduces the downward mixing of momentum within the planetary boundary layer, the surface wind speed, and thus dust emission (Miller et al., 2004a).

If it can be shown that Bodélé dust emission is subject to strong modulation on a variety of time scales that influence the overall output of dust, then insights into the thresholds which constrain the system may be gained.

Minimum dust emission occurs in the evening.

The Pinatubo doesn't show up in the Barbados record at all, indicative of no effect whatsoever upon dust emissions.

Even if the «scope of the project» was not so restricted, the environmental impacts considered in the assessment were those squarely within Federal jurisdiction, which did not include matters such as dust emissions in the local area of construction or closure of land - based facilities at the end of operations.

The deserts in Mongolia (S2) and in western (S4) and northern (S6) China (mainly the Taklimakan and Badain Juran, respectively) can be considered the major sources of Asian dust emissions.

Acid gas, soot, and dust emissions from coal burning are, along with diesel engines, the biggest contributors to microscopic particulate pollution that penetrates deep into the lungs and the bloodstream.

In addition, the servomotor - powered gate offers a gentle but precise opening and closing profile which ensures very controlled product feeding to preserve particle size and structure as well as significantly reducing dust emissions.

Uncertainties in the estimates of global dust emissions are greater than a factor of two (Zender et al., 2004) due to problems in validating and modelling the global emissions.

The machine also features a closed bag - top transport mechanism, improved cleaning devices, fast changeover times and further minimised dust emission.