Timothy Gallagher

Timothy Gallagher
University of Texas at Austin | UT · Department of Geological Sciences

PhD

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25
Publications
3,229
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274
Citations
Citations since 2016
23 Research Items
253 Citations
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060

Publications

Publications (25)
Article
Pedogenic carbonate is an important archive for paleoclimate, paleoecology, and paleoelevation studies. However, it can form under seasonal environmental conditions that differ significantly from the mean growing season environment or mean annual conditions, potentially complicating its use for proxy reconstructions. The observed seasonal temperatu...
Article
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Climate is a primary control on the chemical composition of paleosols, making them a potentially extensive archive applicable to problems ranging from paleoclimate reconstruction to paleoaltimetry. However, the development of an effective, widely applicable paleosol temperature proxy has remained elusive. This is attributable to the fact that vario...
Article
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The Paleocene-Eocene Thermal Maximum (PETM) is the most rapid climatic warming event in the Cenozoic and informs us how the Earth system responds to large-scale changes to the carbon cycle. Warming was triggered by a massive release of 13 C depleted carbon to the atmosphere, evidenced by negative carbon isotope excursions (CIE) in nearly every carb...
Article
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The Pliocene is considered an analog for future climate. Insolation is found the dominant forcing for Asian precipitation over the late Pliocene, evidenced by magnetic enhancement of Chinese loess caused by formation of nanometer‐scale ferrimagnetic grains during pedogenesis corresponding to high precipitation. However, lack of European loess limit...
Article
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Paleosols preserved in the Red Clay depositional sequence of the Chinese Loess Plateau record information about vegetation and regional hydrology responses to global temperature variation throughout the late Miocene and Pliocene. Reconstructing spatial and temporal patterns of environmental change across the Loess Plateau from carbon isotopes of pe...
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Drylands occupy nearly 40% of the land surface and comprise a globally significant carbon reservoir. Dryland‐atmosphere carbon exchange may regulate interannual variability in atmospheric CO2. Quantifying soil respiration rates in these environments is often complicated by the presence of calcium carbonates, which are a common feature of dryland so...
Article
Soil carbonates are important paleoclimate archives, but interpretations of their isotopic compositions (δ¹⁸O, δ¹³C, and Δ47) are hampered by uncertainty in the annual timing of their accumulation. Several previous studies have inferred the annual timing of soil carbonate formation by comparing modern air/soil temperatures with temperatures estimat...
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Full-text available
The Paleocene‐Eocene Thermal Maximum was a rapid global warming event at ~56 Ma that is associated with a negative carbon isotope excursion (CIE) and was driven by a geologically rapid release of carbon into the ocean‐atmosphere system. We evaluated the plausibility of two hypothetical mechanisms behind the observed ~−2‰ difference between the magn...
Article
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Paleosols comprise an important archive of continental paleoclimate information throughout geologic history, but resolving temperature seasonality poses a challenge to the application of paleosol-derived temperature proxies. Not only does seasonality exert a strong control on the biosphere, but it can also obfuscate accurate interpretation of proxy...
Article
The Midcontinent Rift System (MRS) is a Late Mesoproterozoic (∼1.1Ga) sequence of volcanic and sedimentary rocks exposed in the Lake Superior Region of North America. The MRS continues to be the focus of much research due to its economic mineral deposits as well as its archive of Precambrian life and tectonic processes. In order to constrain the po...

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