A5091228607- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Geological and Geophysical Studies
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Paleontology and Stratigraphy of Fossils
- Planetary Science and Exploration
- Offshore Engineering and Technologies
- Geological formations and processes
- Spacecraft and Cryogenic Technologies
- Geomagnetism and Paleomagnetism Studies
- Astronomical Observations and Instrumentation
- Marine Biology and Ecology Research
- Hydrocarbon exploration and reservoir analysis
- Marine and coastal ecosystems
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Marine and environmental studies
- Reservoir Engineering and Simulation Methods
- Geological Modeling and Analysis
- Geological Studies and Exploration
- Drilling and Well Engineering
- Atmospheric and Environmental Gas Dynamics
- Geological and Tectonic Studies in Latin America
University of California, Santa Cruz
2016-2025
Kiel University
2023
Sam Houston State University
2021
University of Plymouth
2021
Geological Survey of Western Australia
2021
Tongji University
2021
Discovery Place
2021
Texas A&M University
2021
International Ocean Discovery Program
2021
United States Office of Personnel Management
2021
During the warm early Pliocene (∼4.5 to 3.0 million years ago), most recent interval with a climate warmer than today, eastern Pacific thermocline was deep and average west-to-east sea surface temperature difference across equatorial only 1.5 ± 0.9°C, much like it is during modern El Niño event. Thus, strong gradient not stable permanent feature. Sustained Niño-like conditions, including relatively weak zonal atmospheric (Walker) circulation, could be consequence of, play an important role...
During the early Pliocene, 5 to 3 million years ago, globally averaged temperatures were substantially higher than they are today, even though external factors that determine climate essentially same. In tropics, El Niño was continual (or "permanent") rather intermittent. The appearance of northern continental glaciers, and cold surface waters in oceanic upwelling zones low latitudes (both coastal equatorial), signaled termination those warm conditions end permanent Niño. This led...
The Antarctic Circumpolar Current (ACC) represents the world's largest ocean-current system and affects global ocean circulation, climate ice-sheet stability
Research Article| March 01, 2001 Role of Panama uplift on oceanic freshwater balance Gerald H. Haug; Haug 1Department Earth Sciences, Eidgenössische Technische Hochschule, 8092 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar Ralf Tiedemann; Tiedemann 2Geomar, 24148 Kiel, Germany Rainer Zahn; Zahn 3Department Cardiff University, Cardiff, UK A. Christina Ravelo 4Institute Marine University California, Santa Cruz, California 95064, USA Author and Article...
Abundances of 12 species planktonic foraminifera collected in two plankton tows from the east tropical Atlantic are compared to chlorophyll content and temperature sea water which they were collected. As expected previous work tropics, all dominant occur greatest abundance within photic zone. Many abundances seasonal thermocline association with maximum concentration, while a few algal symbiont‐bearing mixed layer. The δ 18 O measurements shells core top sediment samples confirm vertical...
Time series of alkenone unsaturation indices gathered along the California margin reveal large (4° to 8°C) glacial-interglacial changes in sea surface temperature (SST) over past 550,000 years. Interglacial times with SSTs equal or exceeding that Holocene contain peak abundances pollen redwood, distinctive component temperate rainforest northwest coast California. In region now dominated by Current, warmed 10,000 15,000 years advance deglaciation at each five glacial maxima. did not rise...
Given the importance of upwelling processes to coastal productivity and regional climate, it is critical study role regions within context global climate change. We generated sea surface temperature (SST) records for last 5 million years in three important regions: eastern equatorial Pacific, California margin, Peru margin. Prior ∼3.0 Ma, SSTs at all sites were significantly warmer than today (by 3–9°C), indicating that cold characterize modern Pacific Ocean did not exist early Pliocene warm...
In the tropical Atlantic, planktonic foraminfera species are vertically distributed with highest abundances occurring in photic zone (approximately 0–100 m). The Atlantic thermocline dips from east to west and varies seasonally due changes southeast northeast trade winds. east, is zone, west, well‐mixed surface layer extends below most of year. As expected vertical distributions plankton tows, assemblages on seafloor correlated hydrographic conditions overlying ocean layer. A new technique...
We evaluate the relationship between ten surface ocean (0–300 m) hydrographic parameters and spatial distribution of factor‐analyzed core top planktonic foraminiferal abundances in tropical Pacific Ocean (24°N–24°S) for tops <3800 m. The first three faunal factor loadings (88% variance) are most highly correlated to subsurface variability (mixed layer depth, thermocline depth) resistant species percent (RSP). However, RSP is not related dissolution but depth. Factor I G. glutinata, ruber...
The Pacific Ocean has played a major role in climate evolution throughout the Cenozoic (65–0 Ma). It is fundamental component of global heat transport and circulation, dominant locus primary productivity, and, consequently, largest reservoir for carbon exchange between oceans atmosphere. A satisfactory understanding evolutionary history its impact on currently data‐limited. Nevertheless, large dynamic range conditions sets stage to greatly expand our biogeochemical cycles. Past Earth...
Abstract. A range of future climate scenarios are projected for high atmospheric CO2 concentrations, given uncertainties over human actions as well potential environmental and climatic feedbacks. The geological record offers an opportunity to understand system response a forcings feedbacks which operate multiple temporal spatial scales. Here, we examine single interglacial during the late Pliocene (KM5c, ca. 3.205±0.01 Ma) when exceeded pre-industrial but were similar today lowest emission...
A new tilt on predicting future ENSO variability finding should improve the ability of climate models to predict behavior El Niño–Southern Oscillation (ENSO) in a warmer future. Ford et al. looked at distribution surface and subsurface temperatures eastern western equatorial Pacific 19,000 years ago between 3000 6000 ago. Temperatures fluctuated over greater range during older period. thus depended more thermocline than east-to-west temperature gradient, as previously thought. Science , this...
Abstract The Indo‐Pacific Warm Pool (IPWP) plays a crucial role in influencing climate dynamics both the tropics and globally. Yet, there is an ongoing controversy concerning evolution of surface temperatures IPWP since Pliocene, which fueled by contradictory proxy evidence. Temperature reconstructions using TEX 86 indicate gradual cooling ∼2°C from Pliocene to today while Mg/Ca‐based studies planktonic foraminifera do not report any long‐term trends. A bias Mg/Ca records due seawater...