The data above were extracted from the Essential Science
Indicators database of Clarivate. This database, currently
covering the period January 1998 through August 2008, surveys only journal
articles (original research reports and review articles) indexed by Thomson
Reuters. Articles are assigned to a category based on the journals in which
they were published and Clarivate’s journal-to-category field
definition scheme. Both articles tabulated and citation counts to those
articles are for the period indicated. Here our ranking in geosciences is
by citations per paper -- among nations that earned 10,000 or more
citations during the period -- to reveal weighted impact. For articles with
multiple authors from different nations, each nation receives full, not
fractional, citation credit. Essential Science Indicators lists nations
ranked in the top 50% for a field over a given period, based on total
citations. In geosciences, 100 nations are listed, meaning 200 were
surveyed. Thirty-three nations collected at least 10,000 citations during
the period.
This item also appeared in the Times Higher Education magazine,
reprinted with their
permission.