CDA cruise science: Comparison of measured dust flux at 1AU with models

2002 ◽  
pp. 160-163
Author(s):  
M. Müller ◽  
B.J. Goldsworthy ◽  
N. McBride ◽  
S.F. Green ◽  
J.A.M. McDonnell ◽  
...  
Keyword(s):  
Dust Flux

scholarly journals Potentially bioavailable iron delivery by iceberg-hosted sediments and atmospheric dust to the polar oceans

2016 ◽  
Vol 13 (13) ◽  
pp. 3887-3900 ◽  
Author(s):  
Robert Raiswell ◽  
Jon R. Hawkings ◽  
Liane G. Benning ◽  
Alex R. Baker ◽  
Ros Death ◽  
...  
Keyword(s):  
Additional Data ◽  
Combustion Products ◽  
The Arctic ◽  
Polar Regions ◽  
Atmospheric Dust ◽  
Dust Transport ◽  
Dust Flux ◽  
Fe Content ◽  
Iron Delivery ◽  
Southern Oceans

Abstract. Iceberg-hosted sediments and atmospheric dust transport potentially bioavailable iron to the Arctic and Southern oceans as ferrihydrite. Ferrihydrite is nanoparticulate and more soluble, as well as potentially more bioavailable, than other iron (oxyhydr)oxide minerals (lepidocrocite, goethite, and hematite). A suite of more than 50 iceberg-hosted sediments contain a mean content of 0.076 wt % Fe as ferrihydrite, which produces iceberg-hosted Fe fluxes ranging from 0.7 to 5.5 and 3.2 to 25 Gmoles yr−1 to the Arctic and Southern oceans respectively. Atmospheric dust (with little or no combustion products) contains a mean ferrihydrite Fe content of 0.038 wt % (corresponding to a fractional solubility of  ∼  1 %) and delivers much smaller Fe fluxes (0.02–0.07 Gmoles yr−1 to the Arctic Ocean and 0.0–0.02 Gmoles yr−1 to the Southern Ocean). New dust flux data show that most atmospheric dust is delivered to sea ice where exposure to melting/re-freezing cycles may enhance fractional solubility, and thus fluxes, by a factor of approximately 2.5. Improved estimates for these particulate sources require additional data for the iceberg losses during fjord transit, the sediment content of icebergs, and samples of atmospheric dust delivered to the polar regions.

scholarly journals Centennial mineral dust variability in high-resolution ice core data from Dome C, Antarctica

2012 ◽  
Vol 8 (2) ◽  
pp. 609-623 ◽  
Author(s):  
F. Lambert ◽  
M. Bigler ◽  
J. P. Steffensen ◽  
M. Hutterli ◽  
H. Fischer
Keyword(s):  
High Resolution ◽  
Southern Ocean ◽  
Mineral Dust ◽  
Ice Core ◽  
Principal Component ◽  
Dominant Factor ◽  
Core Data ◽  
The Past ◽  
Dust Flux ◽  
Soluble Calcium

Abstract. Ice core data from Antarctica provide detailed insights into the characteristics of past climate, atmospheric circulation, as well as changes in the aerosol load of the atmosphere. We present high-resolution records of soluble calcium (Ca2+), non-sea-salt soluble calcium (nssCa2+), and particulate mineral dust aerosol from the East Antarctic Plateau at a depth resolution of 1 cm, spanning the past 800 000 years. Despite the fact that all three parameters are largely dust-derived, the ratio of nssCa2+ to particulate dust is dependent on the particulate dust concentration itself. We used principal component analysis to extract the joint climatic signal and produce a common high-resolution record of dust flux. This new record is used to identify Antarctic warming events during the past eight glacial periods. The phasing of dust flux and CO2 changes during glacial-interglacial transitions reveals that iron fertilization of the Southern Ocean during the past nine glacial terminations was not the dominant factor in the deglacial rise of CO2 concentrations. Rapid changes in dust flux during glacial terminations and Antarctic warming events point to a rapid response of the southern westerly wind belt in the region of southern South American dust sources on changing climate conditions. The clear lead of these dust changes on temperature rise suggests that an atmospheric reorganization occurred in the Southern Hemisphere before the Southern Ocean warmed significantly.

scholarly journals JINGLE, a JCMT legacy survey of dust and gas for galaxy evolution studies: II. SCUBA-2 850 μm data reduction and dust flux density catalogues

2019 ◽  
Vol 486 (3) ◽  
pp. 4166-4185 ◽  
Author(s):  
Matthew W L Smith ◽  
Christopher J R Clark ◽  
Ilse De Looze ◽  
Isabella Lamperti ◽  
Amélie Saintonge ◽  
...  
Keyword(s):  
Flux Density ◽  
Galaxy Evolution ◽  
Data Reduction ◽  
Dust Flux

scholarly journals In-Situ Exploration of Dust in the Solar System and Initial Results from the Galileo Dust Detector

1991 ◽  
Vol 126 ◽  
pp. 21-28
Author(s):  
E. Grün ◽  
H. Fechtig ◽  
M. S. Hanner ◽  
J. Kissel ◽  
B.-A. Lindblad ◽  
...  
Keyword(s):  
Solar System ◽  
Impact Ionization ◽  
Interplanetary Space ◽  
Interplanetary Dust ◽  
High Mass ◽  
Large Area ◽  
Dust Flux ◽  
Highly Sensitive ◽  
Low Mass

AbstractIn-situ measurements of interplanetary dust have been performed in the heliocentric distance range from 0.3 AU out to 18 AU. Due to their small sensitive areas (typically 0.01 m2for the highly sensitive impact ionization sensors) or low mass sensitivities (≥10−9g of the large area penetration detectors) previous instruments recorded only a few 100 impacts during their lifetimes. Nevertheless, important information on the distribution of dust in interplanetary space has been obtained between 0.3 and 18 AU distance from the Sun. The Galileo dust detector combines the high mass sensitivity of impact ionization detectors (10−15g) together with a large sensitive area (0.1 m2). The Galileo spacecraft was launched on October 18, 1989 and is on its solar system cruise towards Jupiter. Initial measurements of the dust flux from 0.7 to 1.2 AU are presented.

scholarly journals Physical Crust Formation on Sandy Soils and Their Potential to Reduce Dust Emissions from Croplands

Land ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 503
Author(s):  
Heleen Vos ◽  
Wolfgang Fister ◽  
Frank Eckardt ◽  
Anthony Palmer ◽  
Nikolaus Kuhn
Keyword(s):  
Wind Erosion ◽  
Sandy Soils ◽  
Soil Surface ◽  
Free State ◽  
Cone Penetrometer ◽  
Crust Formation ◽  
Dust Emissions ◽  
Dust Flux ◽  
Dust Sources

The sandy croplands in the Free State have been identified as one of the main dust sources in South Africa. The aim of this study was to investigate the occurrence and strength of physical soil crusts on cropland soils in the Free State, to identify the rainfall required to form a stable crust, and to test their impact on dust emissions. Crust strength was measured using a fall cone penetrometer and a torvane, while laboratory rainfall simulations were used to form experimental crusts. Dust emissions were measured with a Portable In-Situ Wind Erosion Laboratory (PI-SWERL). The laboratory rainfall simulations showed that stable crusts could be formed by 15 mm of rainfall. The PI-SWERL experiments illustrated that the PM10 emission flux of such crusts is between 0.14% and 0.26% of that of a non-crusted Luvisol and Arenosol, respectively. The presence of abraders on the crust can increase the emissions up to 4% and 8% of the non-crusted dust flux. Overall, our study shows that crusts in the field are potentially strong enough to protect the soil surfaces against wind erosion during a phase of the cropping cycle when the soil surface is not protected by plants.

Millennial-scale changes in atmospheric CO2 levels linked to the Southern Ocean carbon isotope gradient and dust flux

2013 ◽  
Vol 6 (6) ◽  
pp. 457-461 ◽  
Author(s):  
Martin Ziegler ◽  
Paula Diz ◽  
Ian R. Hall ◽  
Rainer Zahn
Keyword(s):  
Southern Ocean ◽  
Carbon Isotope ◽  
Atmospheric Co2 ◽  
Dust Flux ◽  
Co2 Levels ◽  
Ocean Carbon ◽  
Millennial Scale

scholarly journals An urban collection of modern-day large micrometeorites: Evidence for variations in the extraterrestrial dust flux through the Quaternary

Geology ◽  
2016 ◽  
Vol 45 (2) ◽  
pp. 119-122 ◽  
Author(s):  
M.J. Genge ◽  
J. Larsen ◽  
M. Van Ginneken ◽  
M.D. Suttle
Keyword(s):  
Dust Flux

scholarly journals Charged Dust Rings in the Outer Planetary Magnetospheres

1980 ◽  
Vol 90 ◽  
pp. 417-420
Author(s):  
Jay R. Hill ◽  
D. A. Mendis
Keyword(s):  
Interplanetary Dust ◽  
Charged Dust ◽  
Dynamical Processes ◽  
Planetary Magnetospheres ◽  
Jovian Magnetosphere ◽  
Dust Flux ◽  
Pioneer 10

In this paper we discuss the motion of charged dust in outer planetary magnetospheres, particularly that of Jupiter. An increase of almost two orders of magnitude in the dust flux was observed as Pioneer 10 approached within about 30 RJ of Jupiter (Humes et al., 1975). Mendis (1978) suggested that this was a result of electrostatic disruption of interplanetary dust entering the Jovian magnetosphere and the subsequent magnetogravitational trapping of the disruption products. Subsequently, we (Hill and Mendis, 1979) have discussed in detail the physical and dynamical processes associated with the entry of interplanetary dust (assumed to be largely fragile aggregates of the Brownlee type) into the Jovian magnetosphere.

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