A 2100-year trace-element and stable-isotope record at decadal resolution from Rice Lake in the Northern Great Plains, USA
Dados Bibliográficos
A 2100-year multiple proxy record at decadal resolution from a topographically closed (but hydrolog ically open) lake basin was used to reconstruct changes in lake salinity and evaporative intensity and to evaluate the reliability of different proxies for inferring climatic change in the glaciated Northern Great Plains (NGP). At Rice Lake, North Dakota, the ostracode-Mg/Ca ratios show good correlation with other ostracode, diatom and aeolian proxy records from other sites in the NGP. All of these records show significant century-scale periodicities, which have been related to solar variability as inferred from atmospheric radiocarbon records. This coherent and consistent pattern suggests that these sites record climatic variability at regional scales. The interval of the Mediaeval Climatic Anomaly from|900 to 550 cal. yr BP contains two pronounced dry periods. During the following ‘Little Ice Age’, a single period of frequent drought that peaked at|300 cal. yr BP was bracketed by wet periods before and after. In contrast, the ostracode-Sr/Ca ratios and ostracode- and mollusc-180 records from Rice Lake have different patterns and do not correlate well with each other or with the same proxies at other sites. This lack of consistent pattern within a site and among several regional sites suggests seasonal and/or site-specific in‘ uences on these proxies. Variable contributions of groundwater, with low 18O values because of selective recharge from snowmelt, may have played an important role in determin ing the isotopic composition of the lake. The poor correlation of Sr/Ca with other proxies is caused by mediation of inorganic carbonate mineralogy, owing to active uptake of Sr in the formation of inorganic aragonite. Thus, our sediment data along with present-day lakewater chemistry suggest that carbonate-180 records in the NGP cannot be interpreted simply in terms of climate because of significant local groundwater in‘ uences. Ostracode-Mg/Ca ratios tend to be a better indicator of past salinity because of the conservative nature of Mg in oligo-saline waters (10‰ salinity)
Aeolian processes · Aquifer · Arid · Climate change · Climatology · Geography · Geomorphology · Groundwater · Groundwater recharge · Holocene · Ice core · Paleoclimatology · Physical geography · Radiocarbon dating · Snow · Snowmelt · Stable isotope ratio · δ18O · Geology and Paleoclimatology Research · Groundwater and Isotope Geochemistry · Isotope Analysis in Ecology · Geology · Oceanography · Paleontology
The magnitude of error in conventional bulk-sediment radiocarbon dates from central North America
A record of late-Holocene environmental change from southern New England, USA
Carbon sequestration in western Canadian peat highly sensitive to Holocene wet-dry climate cycles at millennial timescales
Environmental history of a closed-basin lake in the US Great Plains
Holocene dune activity and environmental change in the prairie parki and and boreal forest, central Saskatchewan, Canada
Late-Holocene flooding and drought in the Northern Great Plains, USA, reconstructed from tree rings, lake sediments and ancient shorelines
Holocene relationships between climate, waterfowl, and lacustrine nutrient cycling at Kettle Lake, North Dakota, USA
An 850-year ostracod-shell trace-element record from Sugan Lake, northern Tibetan Plateau, China
Late Holocene vegetation and climate changes in the Great Hinggan Mountains, northeast China
A severe centennial-scale drought in midcontinental North America 4200 years ago and apparent global linkages
High-Resolution Age Model Based on AMS Radiocarbon Ages for Kettle Lake, North Dakota, USA
Hydrologic Variation in the Northern Great Plains During the Last Two Millennia
Extreme and persistent drought in California and Patagonia during mediaeval time
Possible role of climate in the collapse of Classic Maya civilization
Comparison of oxygen isotope records from the Gisp2 and GRIP Greenland ice cores
Holocene environmental and climatic change in the Northern Great Plains as recorded in the geochemistry of sediments in Pickerel Lake, South Dakota
Little Ice Age' aridity in the North American Great Plains
INTCAL98 Radiocarbon Age Calibration, 24,000-0 cal BP
| Obras citantes distintas | 11 |
|---|---|
| Citações por ano | 0,48 |
| Intervalo de citações | 2003 - 2023 (21) |
| Velocidade de citação | historical |
| Altamente citado | Não |
| Tipos de citação | Neutras: 9 |