USGS scientist Summer Praetorius of the Geology, Minerals, Energy, & Geophysics (GMEG) Science Center collects samples from an ocean sediment core in the Pacific Ocean Paleoclimatology Lab at Menlo Park, CA. The sediment core is from Tanner Basin, located about 200 miles due west of San Diego in the eastern Pacific Ocean.
Jason A. Addison, Ph.D.
Jason is a Research Geologist with Geology, Minerals, Energy, and Geophysics Science Center. He received a Ph.D in Geological Sciences from University of AK Fairbanks, a BS in Geological Sciences and in Aquatic and Fisheries from University of Washington. Since joining the USGS in 2011 as a Mendenhall Research Fellow, he has continued to put his expertise as a paleoceanographer to work.
He is a research geologist in the Geology, Minerals, Energy, and Geophysics Science Center, stationed in Menlo Park, CA. Jason is trained to use geochemical proxies to reconstruct past ocean conditions. His primary interest is in how past climates affect ocean ecosystems in the North Pacific Ocean during the Holocene (past 11,700 years). He is currently contributing to different projects using geochemical and geophysical tools to reconstruct past ocean ecosystem productivity and environmental conditions using multiple processes from organic carbon, CaCO3, and biogenic silica concentrations; organic matter (C & N) stable isotope ratios; inorganic trace metal data; 3-D computerized tomography (CT) scanning; core-scanning XRF; to multivariate statistical analyses. In addition, he also uses a combination of radiocarbon dating, tephrochronology (the identification and dating of volcanic ash deposits), and varve counts to develop robust age-depth models in marine sediment cores.
Professional Experience
2014 - current: USGS Research Geologist
2011- 2014: USGS Mendenhall Research Fellow
2010 - 2011: Idaho State University Postdoctoral Scientist
Education and Certifications
Ph.D., Geological Sciences, Univ. of Alaska Fairbanks, 2009
B.S., Geological Sciences, Univ. of WA [with Distinction], 2004
B.S., Aquatic and Fisheries Sciences, Univ. of WA [with Distinction], 2004
Science and Products
Pacific Ocean Patterns, Processes, and Productivity (POP3): Impacts of ancient warming on marine ecosystems and western North America
Piston and gravity core data collected during USGS cruise 2019-642-FA offshore of south-central California in support of the Bureau of Ocean Energy Management (BOEM) California Deepwater Investigations and Groundtruthing (Cal DIG I) alternative energy pro
Donated ROV vibracore and sampling data collected during Monterey Bay Aquarium Research Institute cruises in 2019 offshore of south-central California
USGS scientist Summer Praetorius of the Geology, Minerals, Energy, & Geophysics (GMEG) Science Center collects samples from an ocean sediment core in the Pacific Ocean Paleoclimatology Lab at Menlo Park, CA. The sediment core is from Tanner Basin, located about 200 miles due west of San Diego in the eastern Pacific Ocean.
Probabilistic source classification of large tephra producing eruptions using supervised machine learning: An example from the Alaska-Aleutian arc
Multi-proxy record of ocean-climate variability during the last 2 millennia on the Mackenzie Shelf, Beaufort Sea
An 11,300 yr record of paleoclimatology and paleoceanography of the central California coast in a gravity core from Pioneer Seamount
California deepwater investigations and groundtruthing (Cal DIG) I: Fault and shallow geohazard analysis offshore Morro Bay
The California Deepwater Investigations and Groundtruthing (Cal DIG) I project focuses on the potential seafloor hazards and impacts of alternative energy infrastructure in the outer continental shelf region offshore of south-central California. This is one of three reports covering a single study area located between Monterey and Point Conception, California in federal waters outside of the State
Aleutian Low variability for the last 7500 years and its relation to the Westerly Jet
Response: Commentary: Variability in Shelf Sedimentation in Response to Fluvial Sediment Supply and Coastal Erosion Over the Past 1,000 Years in Monterey Bay, CA, United States
A new set of basaltic tephras from southeastern Alaska represent key stratigraphic markers for the late Pleistocene
Variability in shelf sedimentation in response to fluvial sediment supply and coastal erosion over the past 1,000 years in Monterey Bay, CA, United States
Ice-sheet modulation of deglacial North American monsoon intensification
A North American Hydroclimate Synthesis (NAHS) of the Common Era
A Holocene record of ocean productivity and upwelling from the northern California continental slope
A global multiproxy database for temperature reconstructions of the Common Era
Science and Products
- Science
Pacific Ocean Patterns, Processes, and Productivity (POP3): Impacts of ancient warming on marine ecosystems and western North America
Projections for AD 2100 suggest warming of +1-4°C in the North Pacific Ocean, which will result in widespread transformations throughout the marine environment and western North America. Many of these changes are beyond the predictive capabilities of current climate models. To better address this future uncertainty, our team is developing a geological framework using past warm intervals as... - Data
Piston and gravity core data collected during USGS cruise 2019-642-FA offshore of south-central California in support of the Bureau of Ocean Energy Management (BOEM) California Deepwater Investigations and Groundtruthing (Cal DIG I) alternative energy pro
This data release includes photographs, multi-sensor core logger (MSCL), porewater analyses, and location and depth data from piston and gravity cores collected off the south-central California coast. This dataset is one of several collected as part of the Bureau of Ocean Energy Management (BOEM)-funded California Deepwater Investigations and Groundtruthing (Cal DIG I) project. The purpose of theDonated ROV vibracore and sampling data collected during Monterey Bay Aquarium Research Institute cruises in 2019 offshore of south-central California
This dataset includes photographs of vibracores that were collected by the Monterey Bay Aquarium Research Institute (MBARI) in February 2019 and November 2019 aboard the R/V Western Flyer using the remotely operated vehicle (ROV) Doc Ricketts. The collection of these cores was funded entirely by MBARI, and the cores have been donated to the U.S. Geological Survey (USGS). The cores were collected i - Multimedia
Sediment Cores Reveal the History of the Pacific OceanSediment Cores Reveal the History of the Pacific Ocean
USGS scientist Summer Praetorius of the Geology, Minerals, Energy, & Geophysics (GMEG) Science Center collects samples from an ocean sediment core in the Pacific Ocean Paleoclimatology Lab at Menlo Park, CA. The sediment core is from Tanner Basin, located about 200 miles due west of San Diego in the eastern Pacific Ocean.
USGS scientist Summer Praetorius of the Geology, Minerals, Energy, & Geophysics (GMEG) Science Center collects samples from an ocean sediment core in the Pacific Ocean Paleoclimatology Lab at Menlo Park, CA. The sediment core is from Tanner Basin, located about 200 miles due west of San Diego in the eastern Pacific Ocean.
- Publications
Filter Total Items: 26
Probabilistic source classification of large tephra producing eruptions using supervised machine learning: An example from the Alaska-Aleutian arc
Alaska contains over 130 volcanoes and volcanic fields that have been active within the last 2 million years. Of these, roughly 90 have erupted during the Holocene, with many characterized by at least one large explosive eruption. These large tephra-producing eruptions (LTPEs) generate orders of magnitude more erupted material than a “typical” arc explosive eruption and distribute ash thousands ofAuthorsJordan Edward Lubbers, Matthew W. Loewen, Kristi L. Wallace, Michelle L. Coombs, Jason A. AddisonMulti-proxy record of ocean-climate variability during the last 2 millennia on the Mackenzie Shelf, Beaufort Sea
A 2,000 year-long oceanographic history, in sub-centennial resolution, from a Canadian Beaufort Sea continental shelf site (60meters water depth) near the Mackenzie River outlet is reconstructed from ostracode and foraminifera faunal assemblages, shell stable isotopes (delta 18O, delta 13C) and sediment biogenic silica. The chronology of three sediment cores making up the composite section was esAuthorsLaura Gemery, Thomas M. Cronin, Lee W. Cooper, Lucy Roberts, Lloyd D Keigwin, Jason A. Addison, Melanie Leng, Peigen Lin, Cedric Magen, Marci E. Marot, Valerie SchwartzAn 11,300 yr record of paleoclimatology and paleoceanography of the central California coast in a gravity core from Pioneer Seamount
Diatom, pollen, silicoflagellate, and biogenic opal analyses from a 155 cm-long gravity core from Pioneer Seamount, offshore Santa Cruz, California (PS1410-06 GC, latitude 37.3°N, longitude 123.4°W, water depth 2165 m) are compiled for the last ~11,300 years and compared with those of ODP 1019 and TN062-O550 from northern California. The relative abundance record of the subtropical diatom FragilarAuthorsJohn A. Barron, Jason A. Addison, Linda E. Heusser, David Bukry, Valerie Evelyn Schwartz, Amy WagnerCalifornia deepwater investigations and groundtruthing (Cal DIG) I: Fault and shallow geohazard analysis offshore Morro Bay
The California Deepwater Investigations and Groundtruthing (Cal DIG) I project focuses on the potential seafloor hazards and impacts of alternative energy infrastructure in the outer continental shelf region offshore of south-central California. This is one of three reports covering a single study area located between Monterey and Point Conception, California in federal waters outside of the State
AuthorsMaureen A. L. Walton, Charlie K Paull, Guy R. Cochrane, Jason A. Addison, Roberto Gwiazda, Daniel J. Kennedy, Eve M. Lundsten, Antoinette Gabrielle PapeshAleutian Low variability for the last 7500 years and its relation to the Westerly Jet
The Aleutian Low (AL) is one of the major atmospheric systems that determines environmental conditions during winter in the North Pacific Ocean, with impacts that affect the climates of both Asia and North America from mid- to high latitudes. However, the multi-centennial and longer scale behavior of the AL during the Holocene is not fully understood. In this study, AL variability since 7.5 ka wasAuthorsKana Nagashima, Jason A. Addison, Tomohisa Irino, Takayuki Omori, Kei Yoshimura, Naomi HaradaResponse: Commentary: Variability in Shelf Sedimentation in Response to Fluvial Sediment Supply and Coastal Erosion Over the Past 1,000 Years in Monterey Bay, CA, United States
No abstract available.AuthorsJoe Carlin, Jason A. Addison, Amy Wagner, Valerie Evelyn Schwartz, Jamie Hayward, Victoria SeverinA new set of basaltic tephras from southeastern Alaska represent key stratigraphic markers for the late Pleistocene
An 8-cm-thick black basaltic tephra with nine discrete normally graded beds is present in cores from a lake on Baker Island in southeastern Alaska. The estimated age of the tephra is 13,492 ± 237 cal yr BP. Although similar in age to the MEd tephra from the adjacent Mt. Edgecumbe Volcanic Field, this tephra is geochemically distinct. Black basaltic tephras recovered from two additional sites in soAuthorsPaul S. Wilcox, Jason A. Addison, Sarah J. Fowell, James F. Baichtal, Ken Severin, Daniel H. MannVariability in shelf sedimentation in response to fluvial sediment supply and coastal erosion over the past 1,000 years in Monterey Bay, CA, United States
Continental shelf environments are uniquely situated to capture some of the most dynamic processes on Earth including climatic variability and anthropogenic modifications to coastal systems. Understanding how these processes have affected sediment delivery and accumulation on the shelf in the past may provide insight into potential changes in the future. To address this, we investigated shelf sediAuthorsJoseph Carlin, Jason A. Addison, Amy Wagner, Valerie Evelyn Schwartz, Jamie Hayward, Victoria SeverinIce-sheet modulation of deglacial North American monsoon intensification
The North American monsoon, the dominant source of rainfall for much of the arid US Southwest, remains one of the least understood monsoon systems. The late Pleistocene evolution of this monsoon is poorly constrained, largely because glacial changes in winter rainfall obscure summer monsoon signatures in many regional proxy records. Here, we develop deglacial records of monsoon strength from isotoAuthorsTripti Bhattacharya, Jessica E. Tierney, Jason A. Addison, James W. MurrayA North American Hydroclimate Synthesis (NAHS) of the Common Era
This study presents a synthesis of century-scale hydroclimate variations in North America for the Common Era (last 2000 years) using new age models of previously published multiple proxy-based paleoclimate data. This North American Hydroclimate Synthesis (NAHS) examines regional hydroclimate patterns and related environmental indicators, including vegetation, lake water elevation, stream flow andAuthorsJessica R. Rodysill, Lesleigh Anderson, Thomas M. Cronin, Miriam C. Jones, Robert S. Thompson, David B. Wahl, Debra A. Willard, Jason A. Addison, Jay R. Alder, Katherine H. Anderson, Lysanna Anderson, John A. Barron, Christopher E. Bernhardt, Steven W. Hostetler, Natalie M. Kehrwald, Nicole Khan, Julie N. Richey, Scott W. Starratt, Laura E. Strickland, Michael Toomey, Claire C. Treat, G. Lynn WingardByWater Resources Mission Area, Climate Research and Development Program, Energy Resources Program, Groundwater and Streamflow Information Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Florence Bascom Geoscience Center, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center, St. Petersburg Coastal and Marine Science CenterA Holocene record of ocean productivity and upwelling from the northern California continental slope
The Holocene upwelling history of the northern California continental slope is examined using the high-resolution record of TN062-O550 (40.9°N, 124.6°W, 550 m water depth). This 7-m-long marine sediment core spans the last ∼7500 years, and we use it to test the hypothesis that marine productivity in the California Current System (CCS) driven by coastal upwelling has co-varied with Holocene millennAuthorsJason A. Addison, John A. Barron, Bruce P. Finney, Jennifer E. Kusler, David Bukry, Linda E. Heusser, Clark R. AlexanderA global multiproxy database for temperature reconstructions of the Common Era
Reproducible climate reconstructions of the Common Era (1 CE to present) are key to placing industrial-era warming into the context of natural climatic variability. Here we present a community-sourced database of temperature-sensitive proxy records from the PAGES2k initiative. The database gathers 692 records from 648 locations, including all continental regions and major ocean basins. The recordsAuthorsJulian Emile-Geay, Nicholas P. McKay, Darrell S. Kaufman, Lucien von Gunten, Jianghao Wang, Kevin J. Anchukaitis, Nerilie J. Abram, Jason A. Addison, Mark A.J. Curran, Michael N. Evans, Benjamin J. Henley, Zhixin Hao, Belen Martrat, Helen V. McGregor, Raphael Neukom, Gregory T. Pederson, Barbara Stenni, Kaustubh Thirumalai, Johannes P. Werner, Chenxi Xu, Dmitry V. Divine, Bronwyn C. Dixon, Joelle Gergis, Ignacio A. Mundo, T. Nakatsuka, Steven J. Phipps, Cody C. Routson, Eric J. Steig, Jessica E. Tierney, Jonathan J. Tyler, Kathryn J. Allen, Nancy A. N. Bertler, Jesper Bjorklund, Brian M. Chase, Min-Te Chen, Ed Cook, Rixt de Jong, Kristine L. DeLong, Daniel A. Dixon, Alexey A. Ekaykin, Vasile Ersek, Helena L. Filipsson, Pierre Francus, Mandy B. Freund, M. Frezzotti, Narayan P. Gaire, Konrad Gajewski, Quansheng Ge, Hugues Goosse, Anastasia Gornostaeva, Martin Grosjean, Kazuho Horiuchi, Anne Hormes, Katrine Husum, Elisabeth Isaksson, Selvaraj Kandasamy, Kenji Kawamura, Nalan Koc, Guillaume Leduc, Hans W. Linderholm, Andrew M. Lorrey, Vladimir Mikhalenko, P. Graham Mortyn, Hideaki Motoyama, Andrew D. Moy, Robert Mulvaney, Philipp M. Munz, David J. Nash, Hans Oerter, Thomas Opel, Anais J. Orsi, Dmitriy V. Ovchinnikov, Trevor J. Porter, Heidi Roop, Casey Saenger, Masaki Sano, David Sauchyn, K.M. Saunders, Marit-Solveig Seidenkrantz, Mirko Severi, X. Shao, Marie-Alexandrine Sicre, Michael Sigl, Kate Sinclair, Scott St. George, Jeannine-Marie St. Jacques, Meloth Thamban, Udya Kuwar Thapa, E. Thomas, Chris Turney, Ryu Uemura, A.E. Viau, Diana O. Vladimirova, Eugene Wahl, James W. C. White, Z. Yu, Jens Zinke - News