Sedimentary diatoms in inferring trophic status and limnological changes in boreal lakes Miettinen, Juha O. Sedimentary diatoms in inferring trophic status and limnological changes in boreal lakes. – Analyses of sedimentary diatoms were used for inferring reference (pre-impact) conditions and limnological changes in eastern Fennoscandian lakes. Long-term limnological variation was studied from ...

Abstract. The preservation of calcium carbonate in marine sediments is central to controlling the alkalinity balance ocean and, hence, ocean–atmosphere partitioning CO2. To successfully address carbon cycle–climate dynamics on geologic (?1 kyr) timescales, Earth system models then require an appropriate representation primary controls CaCO3 preservation. At same time, sedimentary carbonates rep...

Sequence stratigraphy is the study of sediments and sedimentary rocks in terms of repetitively arranged facies and associated stratal geometry (Vail 1987; Van Wagoner et al 1988, 1990; Christie-Blick 1991). It is a technique that can be traced back to the work of Sloss et al (1949), Sloss (1950, 1963), and Wheeler (1958) on interregional unconformities of the North American craton, but it becam...

[1] The Eastern Equatorial Pacific (EEP) is a high nutrient–low chlorophyll region of the ocean. Downcore nitrogen isotope records from the EEP have been previously interpreted as a direct reflection of changes in nutrient consumption. However, the observed changes in sedimentary dN since the last glacial maximum have no coherent relationship with export productivity or an inferred variation in...

Macrofossil analysis of a composite 19 m long sediment core from Rano Raraku Lake (Easter Island) was related to litho-sedimentary and geochemical features of the sediment. Strong stratigraphical patterns are shown by indirect gradient analyses of the data. The good correspondence between the stratigraphical patterns derived from macrofossil (Correspondence Analysis) and sedimentary and geochem...