English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Sapropels at Sites 974 and 975 as well as sediment samples from immediately below and above sapropels were analyzed for alkenone concentrations. Paleo–sea-surface temperatures (SSTs) were inferred from the U ′37 unsaturation index in Pleistocene sapropel sequences. These SST estimates vary between 13 ° a d 25°C. The upper range of SST estimates is distinctly warme than modern mean annual SST at both sites and closely groups around the modern summer SST. The cold end of the SST range is still warmer than the mean glacial winter SSTs from the Climate Long-Range Investigation Mapping and P tion Project (CLIMAP) planktonic foraminifer census counts (Thiede, 1978). We infer, therefore, that sapropel formati both sites was coeval with warm climates. Using planktonic δ18O and U′37 SST estimates as input into an oxygen isotope pale otemperature equation, we can deduce seawater δ18O which, in turn, we can use to infer the paleosalinity for two Pleistocen sapropels at Site 975. These paleosalinity estimates are between 32 and 34, considerably lower than the modern salinit at this location. If we use more negative freshwater δw values in the equation, then the salinity offsets are reduced by 2–4 un Depleted salinities, whatever their true values might have been, in conjunction with increased SSTs, imply that sapropel tion in the western Mediterranean occurred during warm and moist climates. This agrees with the idea that sapropel for in the eastern Mediterranean is a result of enhanced northern hemisphere insolation. Whether or not climatic forcing similar marine environmental responses (such as enhanced biological productivity and/or reduced deep-water circula both the eastern and western Mediterranean remains to be determined.

Planktonic d18O and Uk'37 temperature estimates from organic-rich sediments at Sites 974 and 975, Tyrrhenian Sea and Balearic Rise