Research Chemist
Woods Hole Coastal and Marine Science Center
Email:
kkroeger@usgs.gov
Office Phone:
508-457-2270
Fax:
508-457-2310
ORCID:
0000-0002-4272-2349
Location
Gosnold Building
384 Woods Hole Road
Woods Hole
, MA
02543-1598
US
Supervisor:
E. Robert Thieler
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The accretion history of fringing salt marshes located on the south shore of Cape Cod is reconstructed from sediment cores collected in low and high marsh vegetation zones. These marshes are micro-tidal, with a mean tidal range of 0.442 m. Their location within protected embayments and the absence of large rivers results in minimal sediment supply and a dominance of organic matter contributions to sediment peat. Age models based on 210-lead and 137-cesium are constructed to evaluate how vertical accretion and carbon burial rates have changed over the past century. The continuous rate of supply age model was used to age date 11 cores (10 low marsh and 1 high marsh) across four salt marshes. Both vertical accretion...
Categories: Data;
Tags: 137-cesium,
210-lead,
Barnstable County,
Cape Cod,
Commonwealth of Massachusetts, All tags...
Eel Pond,
Environmental Health,
Falmouth,
Geochemistry,
Great Pond,
Hamblin Pond,
Sage Lot Pond,
Soil Sciences,
United States of America,
Waquoit Bay,
Water Quality,
Water Resources,
accretion rate,
carbon,
carbon burial,
carbon isotope analysis,
elevation,
geoscientificInformation,
high marsh,
location,
low marsh,
nitrogen,
oceans,
piston coring,
radiometric dating,
salt marsh elevation,
sea-level change,
sedimentation,
soil chemistry, Fewer tags
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Advancing our mechanistic understanding of ecosystem responses to climate change is critical to improve ecological theories, develop predictive models to simulate ecosystem processes, and inform sound policies to manage ecosystems and human activities. Manipulation of temperature in the field, or the “ecosystem warming experiment,” has proved to be a powerful tool to understand ecosystem responses to changes in temperature. No comprehensive synthesis has been conducted since the last one more than 10 years ago. A new synthetic analysis is critically needed to advance our understanding of ecosystem responses to warming, to highlight experimental artifacts and appropriate interpretations, and to guide development...
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Coastal wetlands are major global carbon sinks, however, they are heterogeneous and dynamic ecosystems. To characterize spatial and temporal variability in a New England salt marsh, static chamber measurements of greenhouse gas (GHG) fluxes were compared among major plant-defined zones (high marsh dominated by Distichlis spicata and a zone of invasive Phragmites australis) during 2013 and 2014 growing seasons. Two sediment cores were collected in 2015 from the Phragmites zone to support previously reported core collections from the high marsh sites (Gonneea and others 2018). Collected cores were up to 70 cm in length with dry bulk density ranges from 0.04 to 0.33 grams per cubic centimeter and carbon content 22.4%...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: 137-cesium,
210-lead,
Cape Cod (606914),
Commonwealth of Massachusetts (606926),
Constant Rate of Supply (CRS) model, All tags...
Ecology,
Masphee (615624),
Sage Lot Pond (616458),
United States of America,
accretion rate,
age model,
biota,
carbon,
carbon burial,
carbon isotope analysis,
coastal processes,
ecological processes,
ecological restoration,
elevation,
environment,
geoscientificInformation,
inlandWaters,
invasive species,
location,
nitrogen,
oceans,
piston coring,
plot sampling,
radiometric dating,
salt marshes,
sea-level change,
sedimentation,
soil chemistry,
wetland ecosystems,
wetland functions,
wetland soils,
wetlands, Fewer tags
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Extended time-series sensor data were collected between 2012 and 2016 in surface water of a tidal salt-marsh creek on Cape Cod, Massachusetts. The objective of this field study was to measure water chemical characteristics and flows, as part of a study to quantify lateral fluxes of dissolved carbon species between the salt marsh and estuary. Data consist of in-situ measurements including: salinity, temperature, pH, dissolved oxygen, redox potential, fluorescent dissolved organic matter, turbidity and chlorophyll. Surface water flow, water level and water elevation data were also measured. The data provided in this release represent a compiled data set consisting of multiple sensor deployments between 2012 and 2016.
Categories: Data;
Tags: Barnstable County,
Cape Cod,
Commonwealth of Massachusetts,
Falmouth,
Geochemistry, All tags...
Marine Geology,
Sage Lot Pond,
Waquoit Bay,
Water Quality,
acoustic doppler current profiling,
biochemistry,
chlorophyll,
dissolved organic matter,
inlandWaters,
low and intermediate salt marsh,
oceans,
salinity,
salt marshes,
surface-water level,
time series datasets,
turbidity,
water chemistry,
water properties,
water quality,
water temperature,
wetland ecosystems, Fewer tags
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Assessment of geochemical cycling within tidal wetlands and measurement of fluxes of dissolved and particulate constituents between wetlands and coastal water bodies are critical to evaluating ecosystem function, service, and status. The U.S. Geological Survey and collaborators collected surface water and porewater geochemical data from a tidal wetland located on the eastern shore of Sage Lot Pond in Mashpee, Massachusetts, within the Waquoit Bay National Estuarine Research Reserve, between 2012 and 2019. Additional porewater geochemical and field data from a tidal wetland on the eastern shore of Great Pond in East Falmouth, MA are also included. These data can be used to evaluate biogeochemical conditions and cycling...
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