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Daniel Obrist
Researcher at University of Massachusetts Lowell
Publications - 88
Citations - 4935
Daniel Obrist is an academic researcher from University of Massachusetts Lowell. The author has contributed to research in topics: Mercury (element) & Soil water. The author has an hindex of 38, co-authored 85 publications receiving 3788 citations. Previous affiliations of Daniel Obrist include Desert Research Institute & Nevada System of Higher Education.
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Journal ArticleDOI
A review of global environmental mercury processes in response to human and natural perturbations: Changes of emissions, climate, and land use
TL;DR: Estimates of gaseous Hg0 emissions to the atmosphere over land, long considered a critical Hg source, have been revised downward, and most terrestrial environments now are considered net sinks of atmospheric Hg due to substantial Hg uptake by plants.
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Tundra uptake of atmospheric elemental mercury drives Arctic mercury pollution
Daniel Obrist,Yannick Agnan,Martin Jiskra,Christine L. Olson,Dominique P. Colegrove,Jacques Hueber,Christopher W. Moore,Christopher W. Moore,Jeroen E. Sonke,Detlev Helmig +9 more
TL;DR: It is shown that most of the Hg in the interior Arctic tundra is derived from gaseous elemental Hg (Hg(0)) deposition, with only minor contributions from the deposition of Hg(ii) via precipitation or AMDEs, and that deposition of that form—the form ubiquitously present in the global atmosphere—occurs throughout the year.
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Mercury Distribution Across 14 U.S. Forests. Part I: Spatial Patterns of Concentrations in Biomass, Litter, and Soils
Daniel Obrist,David W. Johnson,Steve E. Lindberg,Yiqi Luo,Oleksandra Hararuk,Rosvel Bracho,John J. Battles,D. B. Dail,Robert L. Edmonds,Russell K. Monson,Scott V. Ollinger,Stephen G. Pallardy,K. S. Pregitzer,Donald E. Todd +13 more
TL;DR: Results from a systematic investigation of mercury (Hg) concentrations across 14 forest sites in the United States show highest concentrations in litter layers, strongly enriched in Hg compared to aboveground tissues and indicative of substantial postdepositional sorption of Hg.
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A vegetation control on seasonal variations in global atmospheric mercury concentrations
Martin Jiskra,Martin Jiskra,Jeroen E. Sonke,Daniel Obrist,Johannes Bieser,Ralf Ebinghaus,Cathrine Lund Myhre,Katrine Aspmo Pfaffhuber,Ingvar Wängberg,Katriina Kyllönen,Doug Worthy,Lynwill Martin,Casper Labuschagne,Thumeka Mkololo,Michel Ramonet,Olivier Magand,Aurélien Dommergue +16 more
TL;DR: In this article, the role of vegetation uptake by vegetation as an alternative mechanism for driving seasonal variations of atmospheric Hg(0) seasonality has been investigated using satellite data, and it was found that the photosynthetic activity of vegetation correlates with Hg (0) levels at individual sites and across continents.
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Mercury isotope compositions across North American forests
TL;DR: In this article, stable isotope compositions of Hg in foliage, litter, and mineral soil horizons across 10 forest sites in the contiguous United States were systematically characterized, showing that the mass independent isotope signatures in all forest depth profiles are more consistent with those of atmospheric Hg(0) than those of atmosphere Hg (II), indicating that atmospheric hg(II) is the larger source of hg to forest ecosystems.