Julie Richey, Ph.D.
Julie Richey is a Research Geologist at the St. Petersburg Coastal and Marine Science Center.
Paleoclimate and Environmental Change
Establishing a baseline of natural climate variability over the past 2,000 years is essential to accurately predicting regional responses to anthropogenic climate change. My research focus is reconstructing temperature and hydroclimatic variability in the Gulf of Mexico/Subtropical Atlantic Ocean using a broad range of different paleoclimate archives. In addition to generating proxy-based paleoclimate records, I am working on proxy development and calibration studies to improve our ability to quantify past changes in temperature, salinity and precipitation in both terrestrial and marine environments.
Coral Paleoclimate
Research Interests
- Using stable isotopes and trace elements to reconstruct climate from coral skeletons
- Investigating the effect of water quality and coral ecology on geochemical proxies
Field Sites
- US Virgin Islands
- Dry Tortugas National Park
- Florida Keys Reef Tract
Project web page: https://www.usgs.gov/centers/spcmsc/science/coral-reef-ecosystem-studies-crest
Holocene Paleoclimate in the Gulf of Mexico
Project web page: https://www.usgs.gov/centers/spcmsc/science/climate-and-environmental-change-gulf-mexico-and-caribbean
Research Interests
- Paleoclimate Reconstruction from Marine and Lake Sediments
- Coral Reefs as Climate Archives
- Paleoceanographic Proxy Calibration
Field Sites
- Garrison Basin (Gulf of Mexico)
- Fisk Basin (Gulf of Mexico)
- Pigmy Basin (Gulf of Mexico)
- Sediment Trap Site (Gulf of Mexico)
Professional Experience
U.S. Geological Survey, Research Geologist, St. Petersburg Florida, 2012-present
NOAA/UCAR Climate and Global Change Postdoctoral Fellow, University of Washington, School of Oceanography, Seattle, WA, 2010–2012
Education and Certifications
Ph. D. - Marine Geology (2010), Univ. of South Florida, College of Marine Science
M.S. - Marine Geology (2007), Univ. of South Florida, College of Marine Science
B.S. - Geological Sciences/Biological Sciences (2004), The Ohio State Univ.
Science and Products
Weekly resolution particulate flux from a sediment trap in the northern Gulf of Mexico, 2008-2012
Seasonal flux and assemblage composition of planktic foraminifera from the northern Gulf of Mexico, 2008-2012
Ecological controls on the shell geochemistry of pink and white Globigerinoides ruber in the northern Gulf of Mexico: implications for paleoceanographic reconstruction
Evidence of multidecadal climate variability and the Atlantic Multidecadal Oscillation from a Gulf of Mexico sea-surface temperature-proxy record
Regionally coherent Little Ice Age cooling in the Atlantic Warm Pool
1400 yr multiproxy record of climate variability from the northern Gulf of Mexico
Cycles of hurricane landfalls on the eastern United States linked to changes in Atlantic sea-surface temperatures
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
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Filter Total Items: 31
Weekly resolution particulate flux from a sediment trap in the northern Gulf of Mexico, 2008-2012
The U.S. Geological Survey anchored a sediment trap in the northern Gulf of Mexico to collect time-series data on sediment flux from 2008 to 2012. There are continuous measurements of total mass flux and organic carbon flux (ogC) at 7–14 day resolution from 2008 to 2012. The flux of calcium carbonate (CaCO3), particulate nitrogen (nitro), and biogenic silica (Opal) were also measured from January-AuthorsJulie N. Richey, Caitlin E. Reynolds, Eric Tappa, Robert ThunellSeasonal flux and assemblage composition of planktic foraminifera from the northern Gulf of Mexico, 2008-2012
The U.S. Geological Survey anchored a sediment trap in the northern Gulf of Mexico beginning in 2008 to collect seasonal time-series data on the flux and assemblage composition of live planktic foraminifers. This report provides an update of the previous time-series data to include results from 2012. Ten species, or varieties, constituted ~92 percent of the 2012 assemblage: Globigerinoides ruber (AuthorsCaitlin E. Reynolds, Julie N. Richey, Richard Z. PooreEcological controls on the shell geochemistry of pink and white Globigerinoides ruber in the northern Gulf of Mexico: implications for paleoceanographic reconstruction
We evaluate the relationship between foraminiferal test size and shell geochemistry (δ13C, δ18O, and Mg/Ca) for two of the most commonly used planktonic foraminifers for paleoceanographic reconstruction in the subtropical Atlantic Ocean: the pink and white varieties of Globigerinoides ruber. Geochemical analyses were performed on foraminifera from modern core-top samples of high-accumulation rateAuthorsJulie N. Richey, Richard Z. Poore, Benjamin P. Flower, David J. HollanderEvidence of multidecadal climate variability and the Atlantic Multidecadal Oscillation from a Gulf of Mexico sea-surface temperature-proxy record
A comparison of a Mg/Ca-based sea-surface temperature (SST)-anomaly record from the northern Gulf of Mexico, a calculated index of variability in observed North Atlantic SST known as the Atlantic Multidecadal Oscillation (AMO), and a tree-ring reconstruction of the AMO contain similar patterns of variation over the last 110 years. Thus, the multidecadal variability observed in the instrumental recAuthorsR. Z. Poore, K. L. DeLong, J.N. Richey, T. M. QuinnRegionally coherent Little Ice Age cooling in the Atlantic Warm Pool
[1] We present 2 new decadal-resolution foraminiferal Mg/Ca-SST records covering the past 6–8 centuries from the northern Gulf of Mexico (GOM). These records provide evidence for a Little Ice Age (LIA) cooling of 2°C, consistent with a published Mg/Ca record from Pigmy Basin. Comparison of these 3 records with existing SST proxy records from the GOM-Caribbean region show that the magnitude of LIAAuthorsJ.N. Richey, R. Z. Poore, B.P. Flower, T. M. Quinn, D.J. Hollander1400 yr multiproxy record of climate variability from the northern Gulf of Mexico
A continuous decadal-scale resolution record of climate variability over the past 1400 yr in the northern Gulf of Mexico was constructed from a box core recovered in the Pigmy Basin, northern Gulf of Mexico. Proxies include paired analyses of Mg/Ca and δ18O in the white variety of the planktic foraminifer Globigerinoides ruber and relative abundance variations of G. sacculifer in the foraminifer aAuthorsJ.N. Richey, R. Z. Poore, B.P. Flower, T. M. QuinnCycles of hurricane landfalls on the eastern United States linked to changes in Atlantic sea-surface temperatures
The occurrence of hurricane landfalls on the United States may be related to alternating intervals of persistent above-average and below-average surface temperature of the North Atlantic Ocean. The cycle of temperature variations, known as the Atlantic Multidecadal Oscillation (AMO), has been identified by study of records based on thermometer readings that go back to the late 1800s. These recordsAuthorsRichard Z. Poore, Terry Quinn, Julie Richey, Jackie L. SmithNon-USGS Publications**
Richey J.N., Hollander, D.J., Flower, B.P. and Eglinton, T.I., 2011, Merging late Holocene Molecular Organic and Foraminiferal-Based Geochemical Records of SST in the Gulf of Mexico: Paleoceanography, doi:10.1029/2010PA002000.**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
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