A5085105087- Geology and Paleoclimatology Research
- Pleistocene-Era Hominins and Archaeology
- Isotope Analysis in Ecology
- Geological formations and processes
- Cryospheric studies and observations
- Archaeology and Natural History
- Evolution and Paleontology Studies
- Botany, Ecology, and Taxonomy Studies
- Advanced Chemical Sensor Technologies
- Water Quality and Resources Studies
- Image Processing and 3D Reconstruction
- Primate Behavior and Ecology
- Microbial Community Ecology and Physiology
- Fire effects on ecosystems
- Wildlife Ecology and Conservation
- Marine and coastal plant biology
- Plant Water Relations and Carbon Dynamics
- Potato Plant Research
- Geological Studies and Exploration
- Archaeology and ancient environmental studies
- Coastal wetland ecosystem dynamics
- Methane Hydrates and Related Phenomena
- Environmental and Cultural Studies in Latin America and Beyond
- Tree-ring climate responses
University of Southern California
2019-2024
University of Southampton
2024
Southern California University for Professional Studies
2022-2023
State University of New York at Oswego
2022
Lawrence Livermore National Laboratory
2022
University of Oxford
2015
The South Pacific Convergence Zone (SPCZ) is a critical region of intense precipitation, particularly during the austral summer (November—March), situated in tropical Ocean. This known to be highly sensitive variations sea surface temperatures (SSTs) across Pacific. Previous research has demonstrated that decadal-scale shifts SPCZ are influenced by SST variability, but our understanding longer-term changes—spanning multi-decadal millennial timescales—remains...
Abstract The climate of the southwestern North America has experienced profound changes between wet and dry phases over past 200 Kyr. To better constrain timing, magnitude, paleoenvironmental impacts these in hydroclimate, we conducted a multiproxy biomarker study from samples collected new 77 m sediment core (SLAPP‐SRLS17) drilled Searles Lake, California. Here, use biomarkers pollen to reconstruct vegetation, lake conditions, climate. We find that δD values long chain n‐ alkanes are...
Abstract Ancient lake deposits in the Mojave Desert indicate that water cycle this currently dry place was radically different under past climates. Here we revisit a 700 m core drilled 55 years ago from Searles Valley, California, recovered evidence for lacustrine phase during late Pliocene. We update paleomagnetic age model and extract new biomarker climatic conditions (3.373–2.706 Ma). The MBT′ 5Me temperature proxy detects present‐day (21 ± 3°C, n = 2) initially, followed by...
Abstract Well‐dated lacustrine records are essential to establish the timing and drivers of regional hydroclimate change. Searles Basin, California, depositional history a fluctuating saline‐alkaline lake in terminal basin Owens River system draining eastern Sierra Nevada. Here, we U‐Th chronology for ∼76‐m‐long SLAPP‐SLRS17 core collected 2017 based on dating evaporite minerals. Ninety‐eight dated samples comprising nine different minerals were evaluated stratigraphic, mineralogic,...
Hydroclimate in the tropical South Pacific is dominated by Convergence Zone (SPCZ), a region of low-level atmospheric convergence responsible for providing fresh water to 11 million people. The SPCZ known change orientation and intensity response interannual climate phenomena, including El Niño Southern Oscillation (ENSO) interdecadal (IPO), principally through modulation trade wind strength (i.e., Walker circulation strength), resultant moisture inflow. Understanding how changed...
The South Pacific Convergence Zone (SPCZ) is the most prominent precipitation feature in southern hemisphere, extending southeast from Papua New Guinea to French Polynesia. Changes SPCZ dynamics can have major impacts on local communities and ecosystems, as well global hydrologic balance ocean circulation. Variability be characterized changes intensity throughout entire rainfall band, or its mean annual position. Proxy reconstructions of rates single sites within region cannot distinguish...
In the South-East Pacific, understanding how precipitation will respond to changes in temperature is crucial anticipating future climate changes. However, our of regional sensitivity limited by a lack any long-term paleoclimate reconstructions which extend before climatically stable Holocene. To address this knowledge gap,we reconstruct and using biomarker pollen proxies sampled from 50\,ka year-long sediment core located Nuku Hiva (French Polynesia). The hydrogen isotopic composition plant...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Paleoceanography Paleoclimatology. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Biomarker pollen evidence late Pleistocene pluvials in Mojave DesertAuthorsMark DonaldPeapleiDTriptiBhattacharyaiDTimLowensteinDavidMcGeeiDKristianOlsonJustin...
Well-dated lacustrine records are essential to establish the timing and drivers of regional hydroclimate change. Searles Basin, California depositional history a fluctuating saline-alkaline lake in terminal basin Owens River system draining eastern Sierra Nevada. Here we U-Th chronology for ~76-m-long SLAPP-SLRS17 core collected 2017 based on dating evaporite minerals. 98 dated samples comprising 9 different minerals were evaluated stratigraphic, mineralogic, textural, chemical...
Ancient lake deposits in the Mojave Desert indicate that water cycle this currently dry place was radically different under past climates. Here we revisit a 700 m core drilled 55 years ago from Searles Valley, California, recovered evidence for lacustrine phase during late Pliocene. We update paleomagnetic age model and extract new biomarker climatic conditions (3.373–2.706 Ma). The MBT5Me′ temperature proxy, based on bacterial membrane lipids, detects present-day (21 ± 3 ºC, 1s, n = 2)...
Well-dated lacustrine records are essential to establish the timing and drivers of regional hydroclimate change. Searles Basin, California depositional history a fluctuating saline-alkaline lake in terminal basin Owens River system draining eastern Sierra Nevada. Here we U-Th chronology for ~76-m-long SLAPP-SLRS17 core collected 2017 based on dating evaporite minerals. 98 dated samples comprising 9 different minerals were evaluated stratigraphic, mineralogic, textural, chemical...