Plastic litter is an ever-increasing global issue and one of this generation’s key environmental challenges. Microplastics have reached oceans via river transport on a global scale. With the exception of two megacities, Paris (France) and Dongguan (China), there is a lack of information on atmospheric microplastic deposition or transport. Here we present the observations of atmospheric microplastic deposition in a remote, pristine mountain catchment (French Pyrenees). We analysed samples, taken over five months, that represent atmospheric wet and dry deposition and identified fibres up to ~750 µm long and fragments ≤300 µm as microplastics. We document relative daily counts of 249 fragments, 73 films and 44 fibres per square metre that deposited on the catchment. An air mass trajectory analysis shows microplastic transport through the atmosphere over a distance of up to 95 km. We suggest that microplastics can reach and affect remote, sparsely inhabited areas through atmospheric transport.

/pdf/atmospheric-transport-and-deposition-of-microplastics-in-a-1wkh613yci.pdf

Atmospheric transport and deposition of microplastics in a remote mountain catchment

Saharan dust storms: nature and consequences

This article presents a study of the diurnal and seasonal cycles of dust over North Africa, using surface visibility as an indicator of dust. The diurnal cycle shows a reduction of visibility during the daytime hours in the areas where dust is generated, a consequence of the elimination of the nocturnal inversion. The annual cycle reveals that, at latitudes from 5° to 16°N, there is a latitudinal increase in the duration of the presence of aerosols over the course of the year. The presence of aerosols dimishes in the latitudes from 20° to 35°N, indicating that the aerosol content of the Saharan air is lower than that over the semiarid sub-Saharan zones, such as the Sahel. A comparison of three periods, 1957–61, 1970–74, and 1983–87, shows a continually increasing presence of dust, particularly in the western Sahel. The interannual variability of the dust and its annual cycles in these three periods throughout North Africa bear a strong relationship to rainfall fluctuations in the Sahel. Overall, ...

The diurnal and seasonal cycles of wind-borne dust over Africa North of the Equator

Changes in the atmospheric deposition of minor and rare elements between 1975 and 2000 in south Sweden, as measured by moss analysis

Biochemical and Physiological Requirements of Trees for Forest Development Beyond Tree Limits: Molecular Bases for Adaptation of Coniferous Trees to Cold Climates D.J. Durzan. Growth of Mountain Birch in Response to Changing Temperature O. Skre. Environmental Limitations of Forest Development At and Beyond Tree Limits: Causes of Alpine Timberline P. Wardle. Physiology of Trees at Treeline J. Grace, J. James. Potential Tree Species and Provenances for Forest Development in Cold Climates: Genetic Diversity of Tree Populations at their Arctic Limits P.M.A. Tigerstedt. Species and Provenance Choice at Northern Tree Limits in Maritime Climates R. Lines. Provenane Selection, Testing, and Breeding to Accelerate Adaptation and Growth of Trees and Shrubs: Accelerating Adaptation of Trees at Tree Limits by Selective Breeding D. Lindgren. Case Histories of Forest Development Beyond Tree Limits: History of Tree Planting on the Aleutian Islands D. Bruce. 29 additional articles. Index.

Forest development in cold climates.

Frequent saharan dust outbreaks north of the pyrenees

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Frequent saharan dust outbreaks north of the pyrenees