Attempts to probe the ozone layer and the ultraviolet-B levels of the past

Article Abstract:

Indirect methods are used for assessing the variations of ozone and ultraviolet-B (UV-B) radiation in the past in order to understand the current status of atmospheric ozone, which protects the biosphere from UV-B radiation. The variations in the Sun's emission and their effect on the atmosphere, changes in the Earth's orbit, geologic imprints of atmospheric ozone and the modeling of UV-B irradiance from ozone data and meteorological recordings are assessed.

United States, Science & research, Earth, Ozone layer depletion, Ozone layer

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Rationale, concepts and approach to the assessment

Article Abstract:

The findings of the report that focuses on terrestrial ecosystems of the Arctic, from the treeline ecozone to the polar deserts are presented. The assessment of the impact of changes on the terrestrial ecosystem is based on existing literature rather than on research or modeling activities within the Arctic Climate Impacts Assessment (ACIA).

Arctic, Observations, Climatic changes, Climate change, Terrestrial ecosystems

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Spatial and temporal changes in South African solar ultraviolet-B exposure: implications for threatened taxa

Article Abstract:

Findings are presented regarding solar ultraviolet-b fluctuations on endangered plant species in South Africa. They include the relatively low resilience of certain varieties to increased solar UV-B stress, and reductions in reproductive output and general plant fitness.

South Africa, Statistical Data Included, Plant conservation, Rare plants

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