Global-scale patterns in anthropogenic Pb contamination reconstructed from natural archives

Anthropogenic osmium in rain and snow reveals global-scale atmospheric contamination.

Osmium is one of the rarer elements in seawater, with typical concentration of approximately 10 x 10(-15) g g(-1) (5.3 x 10(-14) mol kg(-1)). The osmium isotope composition ((187)Os/(188)Os ratio) of deep oceans is 1.05, reflecting a balance between inputs from continental crust (approximately 1.3) and mantle/cosmic dust (approximately 0.13). Here, we show that the (187)Os/(188)Os ratios measur...

Archives of environmental contamination.

Modeling Patterns in Written Natural Language Questions to Archives

This short paper is part of an ongoing dissertation project and introduces the idea to create an ontological model – the Archival Knowledge Model (AKM) – of common patterns found in written natural language questions to archives. Such an ontological model can be used to analyze and query archival knowledge bases in order to provide more adequate answers and to enable more relevant discovery fac...

Auditory Masking Patterns in Bottlenose Dolphins from Anthropogenic and Natural Sound Sources

12: Auditory Masking Patterns in Bottlenose Dolphins From Anthropogenic and Natural Noise Sources

The primary goal of the current project is to better understand auditory masking by determining masking patterns for a broad variety of environmental noise types, and define the mechanisms that govern auditory signal processing in environmental noise. Behavioral threshold methods developed at SSC San Diego (Finneran, Carder, Schlundt, & Ridgway, 2005) allow thresholds to be obtained rapidly (i....