Top 10 scientists in geosciences based on total citations

	Scientist	Papers	Citations	Citations per paper
1	Jacob, Daniel J., Harvard University Cambridge, Massachusetts	142	5,141	36.20
2	Kaufman, Yoram J. (deceased), formerly Nasa Goddard Space Flight Center, Greenbelt, Maryland	111	5,019	45.22
3	Wallace, John M., University of Washington Seattle, Washington	41	4,772	116.39
4	Crutzen, Paul J., emeritus, Max Planck Institute for Chemistry, Mainz, Germany	111	4,742	42.72
5	Holben, Brent N., Nasa Goddard Space Flight Center, Greenbelt, Maryland	121	4,660	38.51
6	Stuiver, Minze, emeritus, University of Washington, Seattle, Washington	19	4,510	237.37
7	Bard, Edouard G., University Aix-Marseille 3, Cerge, CNRS UMR 6536, Aix-en-Provence	57	4,45	78.19
8	Jouzel, Jean, CEA and Institute Pierre Simon Laplace, CNRS UMR 1572, Gif-sur-Yvette	116	4,430	38.19
9	Jones, Philip D., University of East Anglia, Norwich, England	111	4,294	38.68
10	Seinfeld, John H., California Institute of Technology, Pasadena, California	124	4,139	33.38

The data above were extracted from Thomson Scientific's Essential Science Indicators database. This database, currently covering the period January 1997 to October 2007, surveys only journal articles (original research reports and review articles) indexed by Thomson Scientific. Articles are assigned to a category based on the journals in which they were published and Thomson Scientific¹s journal-to-category field definition scheme. Both articles tabulated and citation counts to those articles are for the period indicated. Naturally, scientists publishing large numbers of papers have a greater likelihood of collecting more citations than scientists publishing fewer papers. This ranking is by total citations. For articles with multiple authors, each author receives full, not fractional, citation credit. Another ranking could be based on citations per paper, which reveals weighted impact. Essential Science Indicators lists authors ranked in the top 1% for a field over a given period, based on total citations. For the current version, 2,142 authors are listed in the field of geosciences, meaning that a total of 214,200 author records were reviewed to obtain these results. The listing is dominated by researchers working on atmospheric science and climatology, an indication of recent scientific interest and progress in the subject of climate change. For more information on Thomson Scientific¹s Essential Science Indicators, see http://scientific.thomson.com/products/esi.