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    The impact of submarine groundwater discharge on nutrient dynamics in a sub-polar mudflat

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    Author
    Haag, Josianne
    Chair
    Kelley, Amanda
    Aguilar-Islas, Ana
    Committee
    Munk, LeeAnn
    Johnson, Mark
    Keyword
    Groundwater flow
    Gulf of Alaska
    Subsurface drainage
    Mud flat ecology
    Estuarine hydrology
    Chemical oceanography
    Biochemistry
    Metadata
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    URI
    http://hdl.handle.net/11122/13081
    Abstract
    Submarine groundwater discharge (SGD) plays a major role in the hydrological and biogeochemical cycles controlling nearshore nutrient availability. The Northern Gulf of Alaska coastline is highly diverse, ranging from rocky beaches, sandy beaches, and mudflats; SGD varies according to sediment permeability, strength of wave pumping, and slope of the water table. SGD has been previously estimated at a rocky beach in the NGA, but this thesis sought to quantity SGD in an extensive mudflat using well-established tracers (radium and radon) and determine the major sources of nutrients to the bay. The rate of SGD was comparable between the mudflat and rocky beach (233 ± 245 and 260 ± 360 cm day⁻¹, respectively), and both locations were significant sources of nitrate and silicic acid, and sinks of phosphate. Offshore water also provides a major input of nitrate and phosphate to the bay. Thus, there is no single dominant source for all macronutrients, consequently, multiple processes must be considered when predicting nutrient cycling.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2022
    Table of Contents
    Chapter 1. General introduction -- 1.1. Groundwater as a source of nutrients -- 1.2. Water residence time as a control on biogenic processes -- 1.3. A high latitude estuary with extensive mudflats: Jakolof Bay, Alaska -- 1.4. Naturally occurring radioisotope tracers -- 1.5. Outline -- 1.6 References. Chapter 2. Methodology -- 2.1. Description of model site -- 2.2. Estimating flux of submarine groundwater discharge (SGD) -- 2.3. Partitioning between freshwater and recirculated seawater in SGD -- 2.4. References. Chapter 3. The role of submarine groundwater discharge to the input of macronutrients within a macrotidal subpolar estuary -- 3.1. Abstract -- 3.2. Introduction -- 3.3. Methods and materials -- 3.4. Results and discussion -- 3.5. Conclusions -- 3.6 References. Chapter 4. General conclusion -- 4.1 Methodological improvements and novel approaches -- 4.2. Major findings -- 4.3. Future directions -- 4.4. References.
    Date
    2022-08
    Type
    Thesis
    Collections
    Oceanography

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