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  • An Experimental Investigation of Interstitial Air Movement in Seasonal Snow

    Creator:
    Drake, Stephen A.
    Abstract:
    Atmospheric pressure changes do not stop at the permeable snow surface but rather propagate into it. These pressure changes range from high-amplitude, low-frequency events caused by seasonal cycles and synoptic weather systems to small-amplitude, high-frequency events caused by topographic features and turbulence. The effect of pressure changes on interstitial air...
    Resource Type:
    Dissertation
    Full Text:
    . ................................................ 39   Figure 2.7. Pressure vs. wind speed bin-averaged at 20 cm depth in 0.25 m s-1 increments for

  • Ecosystem Photosynthesis and Forest-Atmosphere Interactions Inferred from Carbonyl Sulfide

    Creator:
    Rastogi, Bharat
    Abstract:
    An increase in anthropogenic activities since the industrial revolution, primarily due to burning of fossil fuels and changes in land cover, has resulted in a steady increase in the global mean atmospheric CO2 concentrations. While there is unequivocal scientific evidence on global warming and its multidimensional impacts on natural and...
    Resource Type:
    Dissertation
    Full Text:
    ., Dicken, U., Montzka, S. A., & Yakir, D. (2013). Ecosystem photosynthesis inferred from measurements of

  • Soil Moisture Encodes Plant Water Use Strategies

    Creator:
    Bassiouni, Maoya
    Abstract:
    Resilient water, food, and energy management strategies for an ever-growing population and changing environment depends on our understanding of water and carbon cycles from local to global scales. Fluxes of water and carbon are coupled by photosynthesis and plant transpiration cycles the largest fraction of terrestrial water from the land...
    Resource Type:
    Dissertation
    Full Text:
    probability distribution (p(s)) for US-ARM

  • Understanding Signals of the South Pole Ice Core: Chronology, Climate, and Firn Processes

    Creator:
    Epifanio, Jenna A.
    Abstract:
    The South Pole ice core (SPC14), drilled in the field seasons of 2014/2015 and 2015/2016, is an intermediate length, 1,751-m ice core which preserves a 54,000-year record of past climate and atmospheric composition. The SPC14 ice core adds to the spatial grid of ice cores in Antarctica extending into the...
    Resource Type:
    Dissertation
    Full Text:
    40 ka environmental record. Annals of Glaciology, 55(68):137– 146. Casey, K. A., Kaspari, S. D

  • The Evaluation of the Additive Information Contained in New Ecohydrological Measurements

    Creator:
    Li, Bonan
    Abstract:
    The development of ecohydrological frameworks and theories under the ongoing global climate crisis depends on the development of new and advanced ecohydrological measurements. Currently, numerous of datasets have been collected at plot and ecosystem levels to understand the complex interactions of along the soil, plant, and atmosphere continuum. The development...
    Resource Type:
    Dissertation
    Full Text:
    Figure 4.2 The averaged unique information (U), synergistic information (S) and redundant information

  • The late holocene atmospheric methane budget reconstructed from ice cores

    Creator:
    Mitchell, Logan E.
    Abstract:
    Ice cores are considered the gold standard for recording past climate and biogeochemical changes. However, gas records derived from ice core analysis have until now been largely limited to centennial and longer timescales because sufficient temporal resolution and analytical precision have been lacking, except during rare times when atmospheric concentrations...
    Resource Type:
    Dissertation
    Full Text:
    the conceptual framework for the project. S. Gregory contributed open porosity measurements

  • Interpreting Climate of the Past from High-Resolution Ice Core Records of Methane

    Creator:
    Lee, James E.
    Abstract:
    Methane is a product of biogeochemical processes which respond to changes in climate. The history of atmospheric methane is recorded by ice cores providing insight into past changes in these biogeochemical processes. This dissertation is comprised of three studies which focus on centennial- and millenial-scale variability of methane from ice...
    Resource Type:
    Dissertation
    Full Text:
    Schmitt helped develop the concept of this work. Jon S. Ed- wards helped develop the measurement

  • Electronic Conduction Mechanisms in Insulators

    Creator:
    Chiang, Tsung-Han
    Abstract:
    The research presented herein focuses on electrical assessment of oxide thin films as insulators. The current density-electric field (J-E) characteristics of four insulators of dramatically different electrical quality are assessed in terms of their operative electronic conduction mechanisms. Conduction in the two high-quality insulators is dominated by Ohmic conduction and...
    Resource Type:
    Dissertation
    Full Text:
    of 0.1 V s−1. Note that the Ohmic conduction current density is masked by the displacement current

  • Analysis of Carbon-14 Transport from a Contaminated Groundwater Source

    Creator:
    Napier, Jonathan Bamberger
    Abstract:
    Radioecology observes the movement of radioactive isotopes throughout the environment. For radioecology, locations of study are limited to areas accidentally contaminated from a number of sources. The Chalk River Laboratories of Atomic Energy of Canada Limited have stored low level waste since the mid 1940s. In certain instances, the wastes...
    Resource Type:
    Dissertation

  • Measuring Electron Activity to Constrain the Role of Soil Structure in the Formation of Biogeochemical Heterogeneity

    Creator:
    Wanzek, Thomas
    Abstract:
    Soils have a critical role in global carbon (C) cycling, containing one of the largest fast-cycling carbon stocks on earth. Robust representation of soil organic matter dynamics in Earth System Models is critical for future climate prediction. Current C cycling models assume that all C cycling in non-hydric (i.e. ‘upland’)...
    Resource Type:
    Masters Thesis
    Full Text:
    -electrode construction. Peter S. Nico (Lawrence Berkeley National Laboratory), Scott Fendorf (Stanford