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Mongolia Sediment Core Database

Sediment cores were collected in two principal ways, by a small gravity drop-corer for a short plug of the top 10 to 30 cm of sediment, and by a hand-driven piston sampler with a polycarbonate tube as a core barrel for cores of about 1 to 2 m. Here, we call the uppermost sediment from the small drop corer "Core Surface" sediment," and we call the longer sediment cores "Short Cores." (These cores are still "short" relative to the many meters of sediment that often lies below the top 1 to 2 m.)

About 50 samples of core-surface sediment were collected during 2004-05 and analyzed by Umbanhowar’s lab for loss-on-ignition, charcoal, magnetics, carbon/nitrogen ratios, biogenic silica, sediment total phosphorus, and particle size. These samples correspond closely to the surface-sediment samples identified in the Environmental Database, which were analyzed only for loss-on-ignition and mineralogy by Almendinger and colleagues.

Nine short cores were collected from selected lakes during 2004-05, ranging in length from 91 to 175 cm. Age models are still in development, but maximum ages of the bottom sediment in the cores appear to range from 630 to 7,400 calibrated years BP.

Site identification and associated water-quality samples correspond to those identified in the Environmental Database.

For further information, please contact Charles Umbanhowarand visit his Mongolia research web page.

Data Availability

The following data files are available to download in MS Excel (*.xls) format:
CoreSurfID Sample number, location, and analyses done
ShortCoreID Core number, location, length, and estimated maximum age