Replying to: P. W. Thorne Nature 455, doi:10.1038/nature07256; A. N. Grant, S. Bro¨nnimann & ...
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During summer 2007 the Arctic sea-ice shrank to the lowest extent ever observed. The role of the ...
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Surface reflectance is a key parameter in satellite trace gas retrievals in the UV/visible range ...
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Only a few previous observations of very low O3 mixing ratios in the upper troposphere are availa...
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