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Karst systems are useful for examining spatial and temporal variability in Critical Zone processes because they provide a window into the subsurface where waters have interacted with vegetation, soils, regolith, and bedrock across a range of length and time scales. The majority of Critical Zone research has emphasized silicate lithologies, which are typified by relatively slow rates of reactivity and incongruent weathering. However, weathering of carbonate dominated lithology can result in secondary mineral deposits, such as speleothems, which provide a long-term archive for Critical Zone processes. Examination of carbon isotope variability in speleothems has the potential to provide records of changes in vegetation,...
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The storage and persistence of soil organic matter (SOM) is of critical importance to soil health, and to the terrestrial carbon cycle with implications for long-term climate change. To better understand the spatio-temporal controls on SOM, we have developed a new dataset spanning two previously described marine terrace soil chronosequences from northern, CA, USA: the Santa Cruz and the Mattole River chronosequences. Each of these sites, is comprised of several terraces surfaces that span at least 200 ka of soil development. The sites differ with regard to local precipitation, with the Mattole site receiving nearly double the mean annual precipitation of the Santa Cruz site. During the period from 2011 through 2016,...
    map background search result map search result map Soil Biogeochemical Data from a Marine Terrace Soil Climo-Chronosequence Comparison Results from geochemical and mineralogical characterization of Boquillas Shale geochemical reference material ShBOQ-1 Data from a reactive transport modeling study of cave seepage water chemistry Results from geochemical and mineralogical characterization of Boquillas Shale geochemical reference material ShBOQ-1 Data from a reactive transport modeling study of cave seepage water chemistry Soil Biogeochemical Data from a Marine Terrace Soil Climo-Chronosequence Comparison