What could have caused pre-industrial biomass burning emissions to exceed current rates?

Recent studies based on trace gas mixing ratios in ice cores and charcoal data indicate that biomass burning emissions over the past millennium exceeded contemporary emissions by up to a factor of 4 for certain time periods. This is surprising because various sources of biomass burning are linked wi...

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Bibliographic Details
Main Authors: G. R. van der Werf, W. Peters, T. T. van Leeuwen, L. Giglio
Format: Article
Language:English
Published: Copernicus Publications 2013-01-01
Series:Climate of the Past
Online Access:http://www.clim-past.net/9/289/2013/cp-9-289-2013.pdf