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Thomas A. Laakso
Researcher at Harvard University
Publications - 13
Citations - 570
Thomas A. Laakso is an academic researcher from Harvard University. The author has contributed to research in topics: Carbon cycle & Great Oxygenation Event. The author has an hindex of 8, co-authored 13 publications receiving 454 citations.
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Regulation of atmospheric oxygen during the Proterozoic
TL;DR: In this article, the authors show that the maintenance of atmospheric pO2 at ∼1% of present atmospheric levels is inconsistent with modern biogeochemical cycling of carbon, sulfur and iron unless new feedbacks are included.
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What Can We Conclude from Death Registration? Improved Methods for Evaluating Completeness
TL;DR: A suite of demographic methods that estimate the fraction of deaths registered and counted by civil registration systems are evaluated, and three variants are identified that generally perform the best.
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A theory of atmospheric oxygen.
TL;DR: It is shown that the Snowball Earth glaciations, which immediately precede both transitions, provide an appropriate transient increase in atmospheric oxygen to drive the atmosphere either from its Archean state to its Proterozoic state, or from its Protersic state toIts Phanerozoic state.
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Limitations on Limitation
TL;DR: In this article, it was shown that the demand for nutrients is so low that nitrogen, molybdenum, and iron could not have limited the rate of primary production following the evolution of extant nitrogenases.
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Ediacaran reorganization of the marine phosphorus cycle.
TL;DR: This study uses two apparently paradoxical observations—that massively phosphorus-rich rocks first appear at this time, and that the median P content of rocks does not change—to argue for a change in internal marine P cycling associated with rising sulfate levels, and proposes this entire suite of changes results from an increase in the size of the deep-water marine phosphorus reservoir.