A5011442998- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Coral and Marine Ecosystems Studies
- Oceanographic and Atmospheric Processes
- Tree-ring climate responses
- Methane Hydrates and Related Phenomena
- Paleontology and Stratigraphy of Fossils
- Marine and fisheries research
- Climate variability and models
- Groundwater and Isotope Geochemistry
- Geological formations and processes
- Climate change and permafrost
- Geological and Geophysical Studies
- Ocean Acidification Effects and Responses
- Geochemistry and Geologic Mapping
- Marine Biology and Ecology Research
- Coastal wetland ecosystem dynamics
- Hydrocarbon exploration and reservoir analysis
- Marine Bivalve and Aquaculture Studies
- Atmospheric and Environmental Gas Dynamics
- Marine and coastal ecosystems
- Pacific and Southeast Asian Studies
- Physiological and biochemical adaptations
- Archaeology and ancient environmental studies
- Arctic and Antarctic ice dynamics
Western Washington University
2021-2024
University of Washington
2014-2021
Earth and Space Research
2016-2021
Joint Institute for Nuclear Astrophysics
2016
Seattle University
2015
Alaska Pacific University
2014
Yale University
2011-2013
University of Alaska Anchorage
2013
Woods Hole Oceanographic Institution
2008-2011
Massachusetts Institute of Technology
2006
Abstract Reproducible climate reconstructions of the Common Era (1 CE to present) are key placing industrial-era warming into context natural climatic variability. Here we present a community-sourced database temperature-sensitive proxy records from PAGES2k initiative. The gathers 692 648 locations, including all continental regions and major ocean basins. trees, ice, sediment, corals, speleothems, documentary evidence, other archives. They range in length 50 2000 years, with median 547...
Abstract Most annually resolved climate reconstructions of the Common Era are based on terrestrial data, making it a challenge to independently assess how recent changes have affected oceans. Here as part Past Global Changes Ocean2K project, we present four regionally calibrated and validated sea surface temperatures in tropics, 57 published publicly archived marine paleoclimate data sets derived exclusively from tropical coral archives. Validation exercises suggest that our interpretable...
Abstract The clumped isotopic composition of carbonate‐derived CO 2 (denoted Δ 47 ) is a function carbonate formation temperature and in natural samples can act as recorder paleoclimate, burial, or diagenetic conditions. absolute abundance heavy isotopes the universal standards VPDB VSMOW (defined by four parameters: R 13 , 17 18 λ impact calculated values. Here, we investigate whether use updated more accurate values for these parameters remove observed interlaboratory differences measured...
Rationale The clumped isotope composition of CO 2 (Δ 47 ) derived from carbonate is widely used as a paleotemperature proxy with broad applications in geoscience. Its accuracy is, however, limited by inter‐laboratory discrepancies reference materials and disagreement among geothermometer calibrations. Here we show how the correction for abundance 17 O influences these discrepancies. Methods We ‐H equilibration at known temperatures phosphoric acid digested carbonates to generate samples wide...
Abstract. We present a systematic compilation of previously published Holocene proxy climate records from the Arctic. identified 170 sites north 58° N latitude where time series extend back at least to 6 cal ka (all ages in this article are calendar years before – BP), resolved submillennial scale (at one value every 400 ± 200 years) and have age models constrained by 3000 years. In addition conventional metadata for each record (location, type, reference), we include two novel parameters...
We analyzed strontium/calcium ratios (Sr/Ca) in four colonies of the Atlantic coral genus Montastrea with growth rates ranging from 2.3 to 12.6 mm a −1 . Derived Sr/Ca–sea surface temperature (SST) calibrations exhibit significant differences among that cannot be explained by variations SST or seawater Sr/Ca. For single Sr/Ca ratio 8.8 mmol mol , predict SSTs 24.0° 30.9°C. find Sr/Ca–SST relationships are correlated systematically average annual extension rate (ext) each colony such (mmol )...
Abstract Scientific understanding of low-frequency tropical Pacific variability, especially responses to perturbations in radiative forcing, suffers from short observational records, sparse proxy networks, and bias model simulations. Here, we combine the strengths proxies models through coral-based paleoclimate data assimilation. We coral archives ( δ 18 O, Sr/Ca) with dynamics, spatial teleconnections, intervariable relationships CMIP5/PMIP3 Past1000 experiments using Last Millennium...
We reconstructed paleoclimate patterns from oxygen and carbon isotope records the fossil estuarine benthic foraminifera Elphidium Mg/Ca ratios ostracode Loxoconcha sediment cores Chesapeake Bay to examine Holocene evolution of North Atlantic Oscillation (NAO)‐type climate variability. Precipitation‐driven river discharge regional temperature variability are primary influences on salinity water temperature, respectively. first calibrated modern δ 18 O applied this relationship calculate...
The equatorial Pacific Ocean atoll islands of Kiritimati and Teraina encompass great physical, chemical biological variability within extreme lacustrine environments. Surveys lake chemistry sediments revealed both intra- inter-island variability. A survey more than 100 lakes on found salinities from nearly fresh to 150 ppt with the highest values occurring isolated, inland portions island away influence groundwater or tides. Dissolved oxygen (DO) pH also showed considerable a less regular...
Long-term chronologies of precipitation can provide a baseline against which twentieth-century trends in rainfall be evaluated terms natural variability and anthropogenic influence. However, there are relatively few methods to quantitatively reconstruct palaeoprecipitation river discharge compared with proxies other climatic factors, such as temperature. We developed autoregressive least squares statistical models relating Chesapeake Bay salinity regional records. Salinity northern central...
Western subtropical North Atlantic oceanic and atmospheric circulations connect tropical subpolar climates. Variations in these can generate regional climate anomalies that are not reflected Northern Hemisphere averages. Assessing the significance of anthropogenic change at scales requires proxy records allow recent trends to be interpreted context long‐term variability. We present reconstructions Gulf Stream sea surface temperature (SST) hydrographic variability during past two millennia...
Abstract The Mg/Ca of planktic foraminifera is commonly assumed to be a univariate function ocean temperature, but recent work suggests that nonthermal variables may have secondary effect, thereby complicating an inverse approach for paleotemperature reconstructions. However, the significance has not been independently validated, and their inclusion reflect statistical overfitting. Here we evaluate seven predictive on global compilation ( n = 1,124) core‐top spanning five species. An...
The Dungeness crab (Metacarcinus magister) fishery is one of the highest value fisheries in US Pacific Northwest, but its catch size fluctuates widely across years. Although underlying causes this wide variability are not well understood, abundance M. magister megalopae has been linked to recruitment into adult four years later. These pelagic exposed a range ocean conditions during their dispersal period, which may drive occurrence patterns. Environmental exposure history found be important...