Townsend_Ian_Resume
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Ian Townsend is an environmental science graduate from Richard Stockton College of New Jersey with a 3.68 GPA. He has experience analyzing seafloor photography and constructing biostatistics to assess ecosystem health. His projects include mapping hiking trails, identifying high risk forest fire areas, and studying heavy metals in water and sediment samples. He also aided in biodiversity and water quality studies of vernal ponds.
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Under environmental stress, boreal and temperate trees will occasionally form a discontinuous layer of wood about their stem, a condition described as a locally-absent (or “missing”) growth ring. Absent rings can potentially cause errors in tree-ring dates and dendroclimatic reconstructions but the frequency, distribution and controls of these features are not well understood at large spatial scales. Furthermore, the recent claim that the Northern Hemisphere tree-ring network contains multiple chronological errors caused by widespread but unrecognized locally-absent rings has been difficult to evaluate because it is not known where or when absent rings have occurred across boreal and temperate forests or what environmental factors cause the development of spatially-extensive absent rings. Here we present a synthesis of locally-absent rings across the Northern Hemisphere during the last millennium based on 2,359 publicly-available tree ring-width records.
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Absent rings are rare in Northern Hemisphere forests outside the American Sou...
Background/Question/Methods
Under environmental stress, boreal and temperate trees will occasionally form a discontinuous layer of wood about their stem, a condition described as a locally-absent (or “missing”) growth ring. Absent rings can potentially cause errors in tree-ring dates and dendroclimatic reconstructions but the frequency, distribution and controls of these features are not well understood at large spatial scales. Furthermore, the recent claim that the Northern Hemisphere tree-ring network contains multiple chronological errors caused by widespread but unrecognized locally-absent rings has been difficult to evaluate because it is not known where or when absent rings have occurred across boreal and temperate forests or what environmental factors cause the development of spatially-extensive absent rings. Here we present a synthesis of locally-absent rings across the Northern Hemisphere during the last millennium based on 2,359 publicly-available tree ring-width records.
Results/Conclusions
Over the entire dataset, one locally-absent ring was observed for every 240 visible rings. More than half of all records (1,296 of 2,359) did not contain a single absent ring. Absent rings were extremely uncommon at high latitudes; poleward of 50°N, the absent:visible ratio increased from 1:240 to 1:2,500. Absent rings were not widespread during the growing seasons that followed the four largest stratospheric sulfate aerosol injection events of the last millennium, including A.D. 1259 and the “Year Without a Summer” in A.D. 1816 or during the coldest year in the Northern Hemisphere in the last 1,500 years. Because these features have occurred so rarely in high-latitude and high-elevation tree ring-width records, the argument that paleotemperature estimates based on these data contain chronological errors due to unrecognized absent rings is not consistent with field observations. If however the rate of absent-ring formation were to increase in forests outside of the American Southwest, that behavior would represent a response to environmental stress that is without precedent over the last millennium.
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Many of the decisions we make about environmental issues are based on experience. Whether we're setting limits for the use of scarce resources, estimating the risks posed by natural hazards, or deciding how to manage protected areas, our plans for the future often reflect our understanding of the past. The problem is that, when it comes to the environment, our society has a fairly short memory. In this presentation, Dr. St. George will discuss how the study of ancient trees is expanding our perspective on the natural history of the northern Plains and helping to answer questions about what the future may hold for Minnesota's environment.
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