نتایج جستجو برای: dust impact

تعداد نتایج: 800035  

Journal: :Atmospheric Environment 2022

In June 2020, a major dust outbreak occurred in the Sahara that impacted tropical Atlantic Ocean. this study, load and radiative forcing of plumes on both atmosphere ocean surface is investigated by means observations modelling. We estimated loadings excess 8 Tg over eastern Atlantic, comparable to those observed desert during Saharan storms. The induced an up 1.1 K net warming 1.8K air tempera...

2014
Ivy Tan Trude Storelvmo Yong-Sang Choi

Previous laboratory studies and in situ measurements have shown that dust particles possess the ability to nucleate ice crystals, and smoke particles to some extent as well. Even with coatings of pollutants such as sulphate and nitrate on the surface of dust particles, it has been shown that polluted dust particles are still able to nucleate ice in the immersion, deposition, condensation, and c...

2000
S. Bianchi P. B. Alton

We present simulations of Far Infrared (FIR) emission by dust in spiral galaxies, based on the Monte Carlo radiative transfer code of Bianchi, Ferrara & Giovanardi (1996). The radiative transfer is carried out at several wavelength in the Ultraviolet (UV), optical and Near Infrared (NIR), to cover the range of the stellar Spectral Energy Distribution (SED). Together with the images of the galac...

2006
Henn Pärn

The climate–growth relationships and the variation of the radial growth of Oxalis– Myrtillus-site type Norway spruce and Scots pine stands in conditions of different cement dust loads were investigated. The climate–growth relationships were studied during the period from 1946 to 2004. The variation of the mean tree-ring width was studied during three time periods, from 1941 to 1965, from 1966 t...

2011
Stella C. Woodard Deborah J. Thomas Steve Hovan Thomas Westerhold

[1] The accumulation of wind blown (eolian) dust in deep‐sea sediments reflects the aridity/humidity conditions of the continental region supplying the dust, as well as the “gustiness” of the climate system. Detailed studies of Pleistocene glacial‐interglacial dust fluxes suggest changes in accumulation rates corresponding to orbital variations in solar insolation (Milankovitch cycles). While t...

2013
Ian Bell Eckhard A. Groll Ian H. Bell

In this study, the air-side pressure drop and heat transfer performance of plate-fin and microchannel coils were tested under clean and fouled conditions. The heat exchangers were tested with two different types of dust, ASHRAE dust and Arizona Road Test Dust. The ASHRAE dust was found to have a very significant impact on the pressure drop of the microchannel heat exchanger, increasing the air-...

2014
Ian H. Bell Eckhard A. Groll

In this study, the air-side pressure drop and heat transfer performance of plate-fin and microchannel coils were tested under clean and fouled conditions. The heat exchangers were tested with two different types of dust, ASHRAE Standard Dust and Arizona Road Test Dust. The ASHRAE dust was found to have a very significant impact on the pressure drop of the microchannel heat exchanger, increasing...

2014
Jürgen Blum Eike Beitz Mohtashim Bukhari Bastian Gundlach Jan-Hendrik Hagemann Daniel Heißelmann Stefan Kothe Rainer Schräpler Ingo von Borstel René Weidling

For the purpose of investigating the evolution of dust aggregates in the early Solar System, we developed two vacuum drop towers in which fragile dust aggregates with sizes up to ~10 cm and porosities up to 70% can be collided. One of the drop towers is primarily used for very low impact speeds down to below 0.01 m/sec and makes use of a double release mechanism. Collisions are recorded in ster...

2002
Steven W. Ruff Philip R. Christensen

Received 24 August 2001; revised 30 April 2002; accepted 22 May 2002; published 11 December 2002. [1] Emissivity spectra (1670–200 cm ) from the Mars Global Surveyor Thermal Emission Spectrometer (MGS-TES) show significant differences between bright and dark surfaces, allowing further investigation of their physical and mineralogical character. TES spectra from bright surfaces (albedo 0.2) typi...

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