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The primary research of our laboratory is based on the use of natural radioisotopes as tracers of geological and oceanographic processes. By measuring precisely radioisotopes that result from the decay of uranium and thorium in the environment, we investigate such diverse topics as interactions of river water and sediments with sea water; flow of ground water through salt marshes; the mixing rate of the ocean; hydrothermal processes at ocean spreading centers; the internal structure of minerals; the ages, rates, and processes of formation of manganese nodules; the rate of growth of corals; and sea level changes. During the past decade our efforts have been focused on the following topics:
Groundwater Input to the Coastal Ocean: Submarine flow of groundwater (fresh and salty) directly into the coastal ocean has been documented, but there has been no means of quantifying the total flux on a regional scale. Groundwater inputs may be identified using chemical tracers. These tracers have high concentrations in the groundwater and low reactivity in the coastal ocean. The tracers integrate the groundwater signal over a large region. To translate the tracer distribution into a groundwater flux, we must also determine the tracer concentration in the groundwater and the rate of mixing of coastal waters. If the system is in balance, the rate at which the tracer is lost by mixing offshore must equal the rate at which it is being added near the coast. If we can measure the terms in this mass balance, we can establish the groundwater flux.
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Journal of Geophysical Research: Oceansno. 3 (2024)
Abstracts with programs (2023)
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crossref(2023)
Goldschmidt2021 abstractsno. 9 (2022)
Matthias Sieber,Nathan Lanning,Emma Bullock, Kyeong Pil Kong,Jong-Mi Lee,Katherine Mateos,Allison Laubach,Xiaopeng Bian,Shun-Chung Yang, Gabrielle Weiss,Mikael Hult,Paul Henderson,
Goldschmidt2022 abstracts (2022)
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Marine Chemistry (2022): 104180
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