# overview
The Fitzsimmons group focuses on inorganic chemical oceanography, particularly trace metal biogeochemistry. We specialize in environmental analytical chemistry measurements, and our research impact centers on 1) micronutrient metal cycling in the open ocean, 2) marine trace metal physicochemical speciation and stable isotope ratios, and 3) heavy metal pollutant cycling in coastal Texas waters.

# researchAreas[].label
Inductively coupled plasma mass spectrometry

# keywords[]
Isotope Dilution Inductively Coupled Plasma Mass Spectrometry

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3709 Physical Geography And Environmental Geoscience

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Extended X-ray Absorption Fine Structure (exafs) Spectroscopy

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X-ray Absorption Near Edge Structure (xanes) Spectroscopy

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X-ray Absorption Near Edge Structure (xanes)

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Scanning Transmission X-ray Microscopy (stxm)

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3709 Physical Geography And Environmental Geoscience

# educationAndTraining[].organization.label
Massachusetts Institute of Technology - (Cambridge, Massachusetts, United States)

# educationAndTraining[].organization.label
Rutgers University - (New Brunswick, New Jersey, United States)

# educationAndTraining[].organization.label
Boston University - (Boston, Massachusetts, United States)

# educationAndTraining[].field
Chemistry and Biology (with a specialization in Marine Science)

# publications[].label
Assessment of the stability, sorption, and exchangeability of marine dissolved and colloidal metals

# publications[].label
A time-series of heavy metal geochemistry in sediments of Galveston Bay estuary, Texas, 2017-2019.

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The biogeochemical cycling of iron, copper, nickel, cadmium, manganese, cobalt, lead, and scandium in a California Current experimental study

# publications[].label
Controls on the Distribution of Particulate Trace Metals across the Western Antarctic Peninsula Shelf

# publications[].label
Analysis of trace metals (Cu, Cd, Pb, and Fe) in seawater using single batch nitrilotriacetate resin extraction and isotope dilution inductively coupled plasma mass spectrometry.

# publications[].label
Long Distance Transport of Subsurface SedimentDerived Iron From Asian to Alaskan Margins in the North Pacific Ocean

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The Net Impact of Hydrothermal Venting on Oceanic Elemental Inventories: Contributions to Plume Geochemistry from the International GEOTRACES Program

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Biological, Physical, and Atmospheric Controls on the Distribution of Cadmium and Its Isotopes in the Pacific Ocean

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Testing the Canyon Hypothesis: Evaluating light and nutrient controls of phytoplankton growth in penguin foraging hotspots along the West Antarctic Peninsula

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Dissolved Al in the zonal N Atlantic section of the US GEOTRACES 2010/2011 cruises and the importance of hydrothermal inputs

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Controls on dissolved and particulate iron distributions in surface waters of the Western Antarctic Peninsula shelf

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The GEOTRACES Intermediate Data Product 2017

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Spatial Complexity in Dissolved Organic Matter and Trace Elements Driven by Hydrography and Freshwater Input Across the Arctic Ocean During 2015 Arctic GEOTRACES Expeditions

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An overview of dissolved Fe and Mn distributions during the 2010-2011 US GEOTRACES north Atlantic cruises: GEOTRACES GA03

# publications[].label
Diagnostic Morphology and Solid-State Chemical Speciation of Hydrothermally Derived Particulate Fe in a Long-Range Dispersing Plume

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Particulate Cadmium Accumulation in the Mesopelagic Ocean.

# publications[].label
Suspended particulate matter influence on dissolved Nd concentration and isotopic composition along GEOTRACES section GP16

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A 'shallow bathtub ring' of local sedimentary iron input maintains the Palmer Deep biological hotspot on the West Antarctic Peninsula shelf.

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Iron persistence in a distal hydrothermal plume supported by dissolved-particulate exchange

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The Importance of Reversible Scavenging for the Marine Zn Cycle Evidenced by the Distribution of Zinc and Its Isotopes in the Pacific Ocean

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Iron Isotope Biogeochemical Cycling in the Western Arctic Ocean

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Does Sea Spray Aerosol Contribute Significantly to Aerosol Trace Element Loading? A Case Study From the US GEOTRACES Pacific Meridional Transect (GP15)

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A comparison of marine Fe and Mn cycling: US GEOTRACES GN01 Western Arctic case study

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Sources, fluxes and residence times of trace elements measured during the US GEOTRACES East Pacific Zonal Transect

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Near-field iron and carbon chemistry of non-buoyant hydrothermal plume particles, Southern East Pacific Rise 15S

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Tracing the Influence of Fe Sources in the North Pacific Using Fe Isotopes (Preliminary Results from GP15)

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Towards a better understanding of nickel cycling in the modern ocean: development of an automated chromatography method for Ni isotope analysis and the generation of a GEOTRACES Ni isotope dataset in the Pacific Ocean

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Both soluble and colloidal iron phases control dissolved iron variability in the tropical North Atlantic Ocean

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Microbial iron limitation in the oceans twilight zone

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Isotopes illustrate vertical transport of anthropogenic Pb by reversible scavenging within Pacific Ocean particle veils.

# publications[].publisher
Proceedings of the National Academy of Sciences

# publications[].label
Dissolved cadmium and cadmium stable isotopes in the western Arctic Ocean

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The composition of dissolved iron in the dusty surface ocean: An exploration using size-fractionated iron-binding ligands

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Distal transport of dissolved hydrothermal iron in the deep South Pacific Ocean.

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Proceedings of the National Academy of Sciences

# publications[].label
Patterns of iron and siderophore distributions across the California Current System

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Dissolved and particulate trace elements in late summer Arctic melt ponds

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Elevated trace metal content of prokaryotic communities associated with marine oxygen deficient zones

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The biogeochemical balance of oceanic nickel cycling

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Iron distribution in the surface and Oxygen minimum waters of the tropical North Atlantic

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The Transpolar Drift as a Source of Riverine and Shelf-Derived Trace Elements to the Central Arctic Ocean

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Biogeochemical Cycling of Colloidal Trace Metals in the Arctic Cryosphere

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Metal Release from Manganese Nodules in Anoxic Seawater and Implications for Deep-Sea Mining Dewatering Operations.

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Microbial iron limitation in the ocean's twilight zone.

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Distribution and Cycling of Nickel and Nickel Isotopes in the Pacific Ocean

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Arctic Deep Water Ferromanganese-Oxide Deposits Reflect the Unique Characteristics of the Arctic Ocean

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Lead Concentration and Isotopic Compositions in the Central Tropical North Pacific Ocean

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The biogeochemical balance that controls oceanic nickel cycling in the modern and past oceans

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ReEvaluating Hydrogen Sulfide as a Sink for Cadmium and Zinc in the Oxic to Suboxic Upper Water Column of the Pacific Ocean

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Assessment and comparison of Anopore and cross flow filtration methods for the determination of dissolved iron size fractionation into soluble and colloidal phases in seawater

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Biogeochemical Cycling of Dissolved Zinc in the Western Arctic (Arctic GEOTRACES GN01)

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Dissolved iron and iron isotopes in the southeastern Pacific Ocean

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Major processes of the dissolved cobalt cycle in the North and equatorial Pacific Ocean

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Tactical release of a sexually-selected pheromone in a swordtail fish.

# publications[].label
Short-term variability in euphotic zone biogeochemistry and primary productivity at Station ALOHA: A case study of summer 2012

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Detection of iron ligands in seawater and marine cyanobacteria cultures by high-performance liquid chromatography-inductively coupled plasma-mass spectrometry.

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Siderophore-based microbial adaptations to iron scarcity across the eastern Pacific Ocean.

# publications[].publisher
Proceedings of the National Academy of Sciences

# publications[].label
Novel Insights into Marine Iron Biogeochemistry from Iron Isotopes.

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The residence times of trace elements determined in the surface Arctic Ocean during the 2015 US Arctic GEOTRACES expedition

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A Lagrangian View of Trace Elements and Isotopes in the North Pacific

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Lead geochemistry of sediments in Galveston Bay, Texas

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Daily to decadal variability of size-fractionated iron and iron-binding ligands at the Hawaii Ocean Time-series Station ALOHA

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Contribution of resuspended sedimentary particles to dissolved iron and manganese in the ocean: An experimental study

# publications[].label
Thorium isotopes tracing the iron cycle at the Hawaii Ocean Time-series Station ALOHA

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The GEOTRACES Intermediate Data Product 2014

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A Refinement of the Processes Controlling Dissolved Copper and Nickel Biogeochemistry: Insights From the Pan-Arctic

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Characterizing Fe sources on the Alaska Margin and tracing their influence through the North Pacific along the GEOTRACES GP15 section

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Major processes of the dissolved cobalt cycle in the North and equatorial Pacific Ocean

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An intermediate-depth source of hydrothermal 3He and dissolved iron in the North Pacific

# publications[].label
Meridional Central Pacific Ocean Depth Section for Pb and Pb Isotopes (GEOTRACES GP15, 152W, 56N to 20S) Including Shipboard Aerosols

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Dissolved iron in the tropical North Atlantic Ocean

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Partitioning of dissolved iron and iron isotopes into soluble and colloidal phases along the GA03 GEOTRACES North Atlantic Transect

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Coordinated regulation of growth, activity and transcription in natural populations of the unicellular nitrogen-fixing cyanobacterium Crocosphaera.

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An intercalibration between the GEOTRACES GO-FLO and the MITESS/Vanes sampling systems for dissolved iron concentration analyses (and a closer look at adsorption effects)

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Risk-sensitive resource defense in a territorial reef fish

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Tropical cyclone-induced coastal acidification in Galveston Bay, Texas

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Hawaiian imprint on dissolved Nd and Ra isotopes and rare earth elements in the central North Pacific: Local survey and seasonal variability

# researcherOn[].label
Collaborative Research: Assessment of the  colloidal Fe size spectrum in coastal and open ocean waters

# researcherOn[].awardedBy.label
National Science Foundation - (Arlington, Virginia, United States)

# researcherOn[].label
Fate of chemical pollutants in  a local Texas Anthropogenic Estuary

# researcherOn[].awardedBy.label
Texas A&M University - (College Station, Texas, United States)

# researcherOn[].awardedBy.label
National Science Foundation - (Arlington, Virginia, United States)

# researcherOn[].label
Collaborative Research: U.S.  GEOTRACES PMT: Dissolved trace metal distributions and size partitioning (Fe, Mn, Zn, Cu, Cd, Ni, Pb, & Sc)

# researcherOn[].awardedBy.label
Division of Ocean Sciences - (Arlington, Virginia, United States)

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Collaborative Research: Hydrothermal Estuaries: What Sets the Hydrothermal Flux of Fe and Mn to the Oceans?

# researcherOn[].awardedBy.label
Directorate for Geosciences - (Arlington, Virginia, United States)

# researcherOn[].label
Collaborative Research: Management and Implementation of US GEOTRACES GP17 Section: South Pacific and Southern Ocean (GP17-OCE)

# researcherOn[].awardedBy.label
Directorate for Geosciences - (Arlington, Virginia, United States)

# researcherOn[].label
GEOTRACES Arctic section: Dissolved  micronutrient trace metal distributions and size partitioning (Fe, Mn, Zn, Cu, Cd, and Ni)

# researcherOn[].awardedBy.label
National Science Foundation - (Arlington, Virginia, United States)

# researcherOn[].label
MRI: Acquisition of a Multicollector Inductively Coupled Plasma Mass Spectrometer and Laser System for Investigating the Evolution of the Earth’s Climate, Oceans, and Tectonics

# researcherOn[].awardedBy.label
National Science Foundation - (Arlington, Virginia, United States)

# streetAddress
Texas A&M University; Oceanography; 3146 TAMU, O&M 403A

# inTheNews[].label
Human activity generates about 25% of lead in Galveston Bay, study says

# inTheNews[].label
Texas A&M Scientists Find Trace Elements Increasing In Rapidly Changing Arctic Ocean

# etdChairOf[].label
De Salvo, Kimber Marie (2018-08). Using Flow Field-Flow Fractionation Coupled to Inductively Coupled Plasma Mass Spectrometry to Study the Physicochemical Speciation of Colloidal Iron in Seawater. Master's Thesis.