Severe chemical ozone loss in the Arctic during the winter of 1995-96

Article Abstract:

In the period between Jan 1996 and Mar 1996, 120 Dobson units (DU) to 160 DU of ozone were chemically destroyed in the Arctic. This was the result of the simultaneous occurrence of very low Arctic stratospheric temperatures and large stratospheric chlorine loadings. It is likely that stratospheric chlorine concentrations will continue to rise, even though chlorofluorocarbon production is being phased out in the developed world. There is significant interannual variability in Arctic winter temperatures, but there are signs of a cooling of the stratosphere, prompted by rises in radiatively active trace gases.

Arctic regions, Ozone layer depletion

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Short-circuiting of the overturning circulating in the Antarctic Circumpolar Current

Article Abstract:

The rates of mixing and upwelling in the current's intermediate layers over a sector that spans nearly one-tenth of its circumpolar path is measured. The results show that deep-water pathways along and across density surfaces intensify and intertwine as the Antarctic Circumpolar Current flows over complex ocean-floor topography, thus giving rise to a short circuit of the overturning circulation in these regions.

Science & research, Antarctica, Environmental aspects, Ocean bottom, Biogeochemical cycles

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