A5080209261- Geology and Paleoclimatology Research
- Archaeology and ancient environmental studies
- Coastal wetland ecosystem dynamics
- Aeolian processes and effects
- Geological formations and processes
- Environmental and Cultural Studies in Latin America and Beyond
- Isotope Analysis in Ecology
- Pleistocene-Era Hominins and Archaeology
- Soil erosion and sediment transport
- Archaeology and Natural History
- Latin American history and culture
- Tree-ring climate responses
- Aquatic Ecosystems and Biodiversity
- Atmospheric chemistry and aerosols
- Climate variability and models
- Maritime and Coastal Archaeology
- Amazonian Archaeology and Ethnohistory
- Marine and fisheries research
- Pacific and Southeast Asian Studies
- Digital Imaging for Blood Diseases
- Environmental and Ecological Studies
- Geological and Geochemical Analysis
- Archaeology and Rock Art Studies
- American Environmental and Regional History
- Paleontology and Stratigraphy of Fossils
Sonoma State University
2012-2025
Cornell University
2002-2013
Rutgers, The State University of New Jersey
1998-2001
Abstract. Mineral dust plays an important role in the climate system by interacting with radiation, clouds, and biogeochemical cycles. In addition, natural archives show that cycle experienced variability past response to global local change. The compilation of DIRTMAP (Dust Indicators Records from Terrestrial MArine Palaeoenvironments) paleodust data sets last 2 decades provided a benchmark for paleoclimate models include cycle, following time slice approach. We propose innovative framework...
Abstract Loboi Swamp is a 1·5 km 2 freshwater wetland situated near the equator in Kenya Rift Valley. The climate semi‐arid: precipitation ≈ 700 mm year −1 , and evapotranspiration 2500 . Some of water currently used for irrigation. An interdisciplinary study was conducted on geology, hydrology, pedology biology to determine its origin history assess longevity under present hydrological conditions. Sedimentary records from two piston cores (1·8 4 m long) indicate that developed during late...
We present pollen and microscopic charcoal evidence from securely dated lake sediments, located in the Tuxtlas region of Veracruz, Mexico. Two periods agricultural activity are recognized. The earliest phase reflects a low level forest clearance agriculture. data provides minimum date 4830 cal. BP for introduction maize agriculture to region. second indicates intensive prolonged human within tropical forest. Commencing approximately 2600 years ago ending thousand later, this episode...
A variety of stratigraphic analyses (particle grain size, iron concentration, loss on ignition, and macrofossils) from sediments obtained two marsh sites are used to reconstruct a middle late Holocene record stream flow into San Francisco Bay. Browns Island, freshwater/brackish site, is located at the confluence Sacramento Joaquin rivers dominated by stands Scirpus americanus. Peyton Hill brackish site near Carquinez Straits robustus. Twenty-five AMS 14 C dates provide chronostratigraphic...
A peat core from a cutoff paleochannel of Little River on the upper Coastal Plain North Carolina provides continuous pollen record environmental change for past 10,500 years and includes sedimentary overbank floods. Palynological data indicate that early to middle Holocene was wetter than previously suggested lake sites in southeastern United States. The period 9000 6100 cal yr B.P. is characterized by high percentages Nyssa Quercus , but low Pinus . Fifteen large flood events are present...
Abstract Coastal wetlands, including seagrass meadows, emergent marshes, mangroves, and temperate tidal swamps, can efficiently sequester store large quantities of sediment organic carbon (SOC). However, SOC stocks may vary by ecosystem type along environmental or climate gradients at different scales. Quantifying such variability is needed to improve blue accounting, conservation effectiveness, restoration planning. We analyzed in 1,284 cores >6,500 km the Pacific coast North America...
Previous interdisciplinary paleoenvironmental and archaeological research along the Río Verde Valley of Oaxaca, Mexico, showed that Holocene erosion in highland valleys upper drainage basin triggered geomorphic changes river's coastal floodplain. This article uses stratigraphic data from sediment cores extracted Laguna Pastoría, an estuary lower Valley, to examine geomorphology potentially by erosion. Coastal lagoon sediments contain a stratigraphically chronologically distinct record major...
Analyses of three sediment cores collected from a tidal salt marsh located on the western edge San Pablo Bay in Francisco estuary have produced long-term records late Holocene development. The these include suite elements, organic carbon content, fossil seeds, pollen, and stable isotopes. stratigraphy indicates fresher water conditions than present between 3400 2000 cal YBP. A became established at China Camp after about YBP; YBP approximately 700 YBP, were apparently more saline variable....
Paleoecological archives from three paleomeander sites and one archeological feature located in the lower Río Verde Valley, Oaxaca, Mexico, are used to develop a spatial understanding of patterns prehistoric agricultural land use over last ~3000 years. Multiproxy paleoecological data at each site (i.e. magnetic susceptibility, micro- macroscopic charcoal, pollen stable carbon isotopes) provide history use. By examining differences indicators all through time, augmented with our changes...
Abstract. Holocene climate reconstructions are useful for understanding the diverse features and spatial heterogeneity of past future change. Here we present a database western North American paleoclimate records. The gathers time series from 184 terrestrial marine sites, including 381 individual proxy records span at least 4000 last 12 000 years (median duration 10 725 years) have been screened resolution, chronologic control, sensitivity. Records were included that reflect temperature,...
Abstract. Mineral dust plays an important role in the climate system by interacting with radiation, clouds, and biogeochemical cycles. In addition, natural archives show that cycle experienced variability past response to global local change. The compilation of DIRTMAP paleodust datasets last two decades provided a target for paleoclimate models include cycle, following time slice approach. We propose innovative framework organize dataset moves on from positive experience takes into account...
Playa lake systems tend to be overlooked archives of paleoenvironmental change due the likelihood a short and intermittent record deposition. Groundwater-fed wetlands associated with these climate-sensitive playas, however, preserve changes in hydrologic budget are thus valuable for semiarid regions. This study examines paleoecological groundwater-fed wetland from Lake Solai, Kenya. Biological proxies used reconstruct climate impacts over past millennium. Dry conditions persisted between CE...
An inventory of Loboi swamp was undertaken to determine the macrophyte diversity and distribution. A total 36 vascular plant species in 13 families were recorded, with Cyperaceae forming over 30% macrophytes. Two vegetation zones observed, characterised by presence Typha papyrus. The zone, comprising 70% swamp, is dominated T. domingensis rich 35 whereas papyrus zone includes dominant Cyperus only one other species. Distribution macrophytes correlated depth period under water, seasonally...
Abstract. Holocene climate reconstructions are useful for understanding the diverse features and spatial heterogeneity of past future change. Here we present a database western North American paleoclimate records. The gathers time series from 209 terrestrial marine sites, including 382 individual proxy records span at least 4000 last 12 000 years (median duration = 10 603 years), have been screened resolution, chronologic control, sensitivity. Records were included that reflect temperature,...