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Meteoroids of sub-milligram sizes burn up high in the Earth's atmosphere and cause streaks of plasma trails detectable by meteor radars. The altitude at which these trails, or meteors…
In the Subantarctic Southern Ocean, primary productivity is predominantly limited by seasonal changes in light and iron (Fe) availability, shaping the phytoplankton community and impacting the magnitude of the biological carbon pump. However, quantifying the seasonal iron cycle is challenging…
Ice core records from Antarctic and Greenland have revealed that the last deglaciation (ca. 19,000 to 11,000 years before present) was accompanied by a ca. 80 ppmv increase in atmospheric CO2 and a sequence of large, hemispheric climate variations.
The diffusion of meteor trails has recently been exploited to estimate temperatures in the 80-100 km region of … the atmosphere. More recent modeling work suggests that meteoric dust laid down by the trails themselves will … affect the diffusion of the trails.
Measurements of the time taken for meteor radar … echoes to decay can be used to estimate the ambipolar … diffusion coefficient. If it is assumed that the decay of the … radar echo is due strictly to the outward diffusion of ionized … material in the meteor’s trail…
Atrialwas undertaken of two techniques for assessing the physical condition ofwalking tracks (trails) over extended distances. A distance-based technique, in which categorical measurements were made at regular spatial intervals, proved to be sufficiently … reliable to warrant further development.