The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
David J. Sauchyn - One of the best experts on this subject based on the ideXlab platform.
-
A Holocene Paleosalinity diatom record from southwestern Saskatchewan, Canada: Harris Lake revisited
Journal of Paleolimnology, 1997Co-Authors: Susan E. Wilson, John P. Smol, David J. SauchynAbstract:Fossil diatoms were analysed from a 10.3 m core from Harris Lake, Cypress Hills, Saskatchewan, and a diatom-salinity transfer function was used to construct a history of Holocene salinity changes for the lake. The diatom Paleosalinity record indicates that Harris Lake remained fresh
-
a holocene Paleosalinity diatom record from southwestern saskatchewan canada harris lake revisited
Journal of Paleolimnology, 1997Co-Authors: Susan E. Wilson, John P. Smol, David J. SauchynAbstract:Fossil diatoms were analysed from a 10.3 m core from Harris Lake, Cypress Hills, Saskatchewan, and a diatom-salinity transfer function was used to construct a history of Holocene salinity changes for the lake. The diatom Paleosalinity record indicates that Harris Lake remained fresh <0.5 g l-1 throughout the Holocene, with only slight increases in salinity between approximately 6500 and 5200 years BP. This interval corresponds to the only period in the lake's history when planktonic diatoms were abundant; benthic Fragilaria taxa, mainly F. pinnata, F. construens and F. brevistriata were dominant throughout most of the Holocene. The shift from a benthic to a planktonic diatom flora between 6500 and 5200 years BP may be an indirect response to a warmer climate that reduced forest cover in the watershed and allowed greater rates of inorganic sedimentation. The small salinity increase that accompanies the floristic change is probably not the result of lower lake levels; in fact the lake was probably deeper at this point than in the later Holocene. This Paleosalinity record indicates that Harris Lake did not experience episodes of hypersalinity during the mid-Holocene, as suggested by a previous study, and that the lake may have been fresh during the early Holocene as well.
Felipe Garciarodriguez - One of the best experts on this subject based on the ideXlab platform.
-
inferring Paleosalinity trends using the chrysophyte cyst to diatom ratio in coastal shallow temperate subtropical lagoons influenced by sea level changes
Journal of Paleolimnology, 2006Co-Authors: Felipe GarciarodriguezAbstract:Data on chrysophyte cyst to diatom ratios as an index to track Holocene Paleosalinity changes are presented. Six sediment cores taken in four coastal systems influenced by Holocene sea level changes indicate that during the transition from marine/brackish to brackish/freshwater and freshwater conditions, increases in the cyst to diatom ratio were recorded. These data suggest that Holocene changes in paleosalinities in coastal aquatic systems may be tracked by using this simple index, however other factors (such as changes in nutrient levels) may complicate some interpretations. Nevertheless, data required to calculate this simple index are easy to obtain, and so relatively little effort is required to obtain some paleolimnological information on these two important algal groups.
Felipe García-rodríguez - One of the best experts on this subject based on the ideXlab platform.
-
Inferring Paleosalinity trends using the chrysophyte cyst to diatom ratio in coastal shallow temperate/subtropical lagoons influenced by sea level changes
Journal of Paleolimnology, 2006Co-Authors: Felipe García-rodríguezAbstract:Data on chrysophyte cyst to diatom ratios as an index to track Holocene Paleosalinity changes are presented. Six sediment cores taken in four coastal systems influenced by Holocene sea level changes indicate that during the transition from marine/brackish to brackish/freshwater and freshwater conditions, increases in the cyst to diatom ratio were recorded. These data suggest that Holocene changes in paleosalinities in coastal aquatic systems may be tracked by using this simple index, however other factors (such as changes in nutrient levels) may complicate some interpretations. Nevertheless, data required to calculate this simple index are easy to obtain, and so relatively little effort is required to obtain some paleolimnological information on these two important algal groups.
Susan E. Wilson - One of the best experts on this subject based on the ideXlab platform.
-
A Holocene Paleosalinity diatom record from southwestern Saskatchewan, Canada: Harris Lake revisited
Journal of Paleolimnology, 1997Co-Authors: Susan E. Wilson, John P. Smol, David J. SauchynAbstract:Fossil diatoms were analysed from a 10.3 m core from Harris Lake, Cypress Hills, Saskatchewan, and a diatom-salinity transfer function was used to construct a history of Holocene salinity changes for the lake. The diatom Paleosalinity record indicates that Harris Lake remained fresh
-
a holocene Paleosalinity diatom record from southwestern saskatchewan canada harris lake revisited
Journal of Paleolimnology, 1997Co-Authors: Susan E. Wilson, John P. Smol, David J. SauchynAbstract:Fossil diatoms were analysed from a 10.3 m core from Harris Lake, Cypress Hills, Saskatchewan, and a diatom-salinity transfer function was used to construct a history of Holocene salinity changes for the lake. The diatom Paleosalinity record indicates that Harris Lake remained fresh <0.5 g l-1 throughout the Holocene, with only slight increases in salinity between approximately 6500 and 5200 years BP. This interval corresponds to the only period in the lake's history when planktonic diatoms were abundant; benthic Fragilaria taxa, mainly F. pinnata, F. construens and F. brevistriata were dominant throughout most of the Holocene. The shift from a benthic to a planktonic diatom flora between 6500 and 5200 years BP may be an indirect response to a warmer climate that reduced forest cover in the watershed and allowed greater rates of inorganic sedimentation. The small salinity increase that accompanies the floristic change is probably not the result of lower lake levels; in fact the lake was probably deeper at this point than in the later Holocene. This Paleosalinity record indicates that Harris Lake did not experience episodes of hypersalinity during the mid-Holocene, as suggested by a previous study, and that the lake may have been fresh during the early Holocene as well.
Gavin A. Schmidt - One of the best experts on this subject based on the ideXlab platform.
-
Water isotopologues as a quantitative Paleosalinity proxy
Paleoceanography, 2011Co-Authors: Allegra N. Legrande, Gavin A. SchmidtAbstract:[1] Paleosalinity reconstructions are a goal of paleoceanographic study because of their potential to provide insight into past ocean circulation. While temperature reconstructions have been assessed by using multiple independent proxies, the skill of existing salinity reconstructions remains poorly quantified. We examine the applicability of two different approaches using a set of coupled water isotope–enabled general circulation model experiments as a numerical analog for the real climate system. These simulations for the Holocene, at roughly 1000 year time steps, explicitly track variability in both the water isotopologues and salinity. Our simulations suggest that quantitative reconstructions of past salinity variability based solely on inferred δ18Osw variability have very large errors and uncertainties. However, we find that paired δ18Osw and δD variability (from combining biomarker and calcite proxies) holds promise for providing better quantitative estimates of salinity variability.
-
Error analysis of Paleosalinity calculations
Paleoceanography, 1999Co-Authors: Gavin A. SchmidtAbstract:A detailed error analysis is performed for the calculation of open-ocean salinity changes from carbonate oxygen-18 proxy data. Measurement errors are generally negligible, however, errors due to the “goodness of fit” of various regressions used in the calculation are significant. Depending on the method used and on the proxies available, error bars (1σ) for the salinity range from 0.6 to 1.8. In particular, expected errors for the midlatitude and tropical salinity differences at the Last Glacial Maximum are around 1.1 to 2.5. The largest errors occur because of the differences between temporal and spatial seawater oxygen-18:salinity relationships and through the use of nonconcurrent temperature measurements. Methods of improving Paleosalinity estimates should focus on eliminating these large sources of uncertainty.