Burst of the 1969 Leonids and 1982 Lyrids

Radar observations of the last bursts of the Leonids in 1969 and Lyrids in 1982, carried out at the Springhill Meteor Observatory, Canada, both of very short duration, with the rates exceeding a quarter-maximum rate within 50-55 minutes, are used for a study of the mass distribution of meteoroids. In both cases the mass distribution exponents of the meteoroids in the dense clouds largely differ from the values obtained for the older populations of the streams. The highest mass exponent s approximately 2.2-2.4 is found around the peak of the activity, confirming high contribution of smaller meteoroids, and thus also a recent origin of the dense clouds. Consequences of these findings are discussed

Parameterization of Convective Transport in a Lagrangian Particle Dispersion Model and Its Evaluation

This paper presents the revision and evaluation of the interface between the convective parameterization by Emanuel and Živkovic´-Rothman and the Lagrangian particle dispersion model “FLEXPART” based on meteorological data from the European Centre for Medium-Range Weather Forecasts (ECMWF). The convection scheme relies on the ECMWF grid-scale temperature and humidity and provides a matrix necessary for the vertical convective particle displacement. The benefits of the revised interface relative to its previous version are presented. It is shown that, apart from minor fluctuations caused by the stochastic convective redistribution of the particles, the well-mixed criterion is fulfilled in simulations that include convection. Although for technical reasons the calculation of the displacement matrix differs somewhat between the forward and the backward simulations in time, the mean relative difference between the convective mass fluxes in forward and backward simulations is below 3% and can therefore be tolerated. A comparison of the convective mass fluxes and precipitation rates with those archived in the 40-yr ECMWF Reanalysis (ERA-40) data reveals that the convection scheme in FLEXPART produces upward mass fluxes and precipitation rates that are generally smaller by about 25% than those from ERA-40. This result is interpreted as positive, because precipitation is known to be overestimated by the ECMWF model. Tracer transport simulations with and without convection are compared with surface and aircraft measurements from two tracer experiments and to 222Rn measurements from two aircraft campaigns. At the surface no substantial differences between the model runs with and without convection are found, but at higher altitudes the model runs with convection produced better agreement with the measurements in most of the cases and indifferent results in the others. However, for the tracer experiments only few measurements at higher altitudes are available, and for the aircraft campaigns the 222Rn emissions are highly uncertain. Other datasets better suitable for the validation of convective transport in models are not available. Thus, there is a clear need for reliable datasets suitable to validate vertical transport in models

On associations of Apollo asteroids with meteor streams

Potential associations of Apollo asteroids with meteor streams are searched on the basis of the orbital parameters comparison. From all Apollo asteroids discovered through 1991 June those are only selected for further analysis whose orbits approach to less than 0.1 AU to the Earth's orbit. Their orbits are compared with precise photographic orbits of individual meteors from the Meteor Data Center in Lund. Results on the associations of asteroids with meteor streams are presented and discussed

The travel-related carbon dioxide emissions of atmospheric researchers

International audienceMost atmospheric scientists agree that greenhouse gas emissions have already caused significant changes to the global climate system and that these changes will accelerate in the near future. At the same time, atmospheric scientists who ? like other scientists ? rely on international collaboration and information exchange travel a lot and, thereby, cause substantial emissions of carbon dioxide (CO2). In this paper, the CO2 emissions of the employees working at an atmospheric research institute (the Norwegian Institute for Air Research, NILU) caused by all types of business travel (conference visits, workshops, field campaigns, instrument maintainance, etc.) were calculated for the years 2005?2007. It is estimated that more than 90% of the emissions were caused by air travel, 3% by ground travel and 5% by hotel usage. The travel-related annual emissions were between 1.9 and 2.4 t CO2 per employee or between 3.9 and 5.5 t CO2 per scientist. For comparison, the total annual per capita CO2 emissions are 4.5 t worldwide, 1.2 t for India, 3.8 t for China, 5.9 t for Sweden and 19.1 t for Norway. The travel-related CO2 emissions of a NILU scientist, occurring in 24 days of a year on average, exceed the global average annual per capita emission. Norway's per-capita CO2 emissions are among the highest in the world, mostly because of the emissions from the oil industry. If the emissions per NILU scientist derived in this paper are taken as representative for the average Norwegian researcher, travel by Norwegian scientists would nevertheless account for a substantial 0.2% of Norway's total CO2 emissions. Since most of the travel-related emissions are due to air travel, water vapor emissions, ozone production and contrail formation further increase the relative importance of NILU's travel in terms of radiative forcing

Putting Children First: Building a Framework for International Action to Address the Impact of Small Arms on Children

YesSmall arms and light weapons (SALW) are recognised as increasing the lethality, duration and intensity of conflict with the effects of these weapons lasting for many years. The negative impacts of SALW are often greatest for the most vulnerable groups, including children. There is widespread international recognition of the negative effects of small arms on children, but efforts to control small arms and those to protect children have rarely been linked. The United Nations 2001 Conference on the Illicit Trade in Small Arms and Light Weapons in All Its Aspects and the UN Special Session on Children provide unique opportunities to examine the complex issues surrounding small arms and their impact on children, in particular, how the presence, proliferation and misuse of small arms and light weapons affect the lives of children

A Comparison of Fish Growth Rates in a Pristine and an Urbanized Salt Marsh Estuary

Fish grow as they age, but not all fish grow at the same rate. Internal and external factors such as stress and food availability can change the growth rate. This study looks to see if the growth rates vary between North Inlet and Murrell’s Inlet, SC for red drum and striped mullet. Red drum grew faster and showed a typical length-frequency graph in North Inlet. The cause of the difference in growth was not tested, but human influence on the estuaries was considered to be a possible factor

Systemic lupus erythematosus and its ABCs (APRIL/BLyS complexes)

BLyS and APRIL are closely related members of the TNF ligand superfamily. These cytokines individually may contribute importantly to the development and maintenance of systemic lupus erythematosus (SLE). Dillon and colleagues demonstrate that in contrast to most members of the TNF ligand superfamily, which form only homotrimers, BLyS and APRIL can complex as heterotrimers. These complexes have in vitro biological activity, and circulating levels of BLyS/APRIL heterotrimers are frequently elevated in SLE, but not rheumatoid arthritis, patients. Although the mechanism and regulation of heterotrimer formation, the interconversion (if any) between homotrimers and heterotrimers, and, indeed, the normal physiologic role for such heterotrimers remain unknown, their preferential overexpression in SLE, but not in rheumatoid arthritis, raises the possibility that such heterotrimers may be playing a contributory role in SLE

False Light Invasion of Privacy in Docudramas: The Oxymoron Which Must Be Solved

According to Giardello, boxing historians, and even Rubin “Hurricane” Carter, himself, the opening sequence of The Hurricane — which purports to tell the “true story” of Carter’s unjust imprisonment — was not only far from being accurate, it was a complete falsity. In reality, the fight was a lopsided Giardello victory, to the delight of the 6,000 fans in attendance. Joey Giardello, who knew nothing of the movie until the day he saw it in the theater, filed suit on February 16, 2000 against Universal Pictures claiming that the film inaccurately portrayed him as a weak fighter and the beneficiary of a racially motivated decision. Giardello sued for unspecified monetary damages and wanted future copies of the movie to include a trailer showing archival footage of the fight. This case exemplifies the disturbing and growing trend of false light invasion of privacy in present day motion pictures. Due to courts’ narrow application of the doctrine of false light invasion of privacy, as it applies to motion pictures, false light has become a near impossible claim to prevail upon

Arms Industry

A summary assessment of the dimensions and concentrations of military equipment manufacture primarily in the United States and western Europe and the extent of availability of this equipment to buyers throughout the world. Treaty-based limitations are also listed