Publication Date:
2023-06-27
Description:
A new planktic foraminifer transfer function (GSF18) related 5 North Atlantic assemblages to winter and summer sea surface temperature. GSF18, based on recombined and simplified core top census data, preserves most environmental information and reproduces modern North Atlantic conditions with approximately the same accuracy as previous transfer functions, but can be more readily applied to faunal samples ranging in age from Pliocene to Holocene. Transfer function GSF18 has been applied to faunal data from Deep Sea Drilling Project Hole 552A to produce a 2.5 m.y. sea-surface temperature (SST) time series. Estimates show several periods between 2.3 and 4.6 Ma during which mean SST's were both several degrees warmer and several degrees cooler than modern conditions. Between 2.9 and 4.0 Ma SST was generally warmer than modern except for a 250 k.y. interval centered at 3.3 Ma. Maximum SST, with respect to modern conditions, occurred after the cool interval near 3.1 Ma when SST was approximately 3.6° C warmer than present conditions. Comparison of SST estimates with stable isotope data suggest that after peak warming at 3.1 Ma, there was an overall surface water cooling with concomitant build up of global ice volume, culminating in Northern Hemisphere glaciation. This event is also indicated by the presence of ice rafted detritus in 552A sediments at about 2.45 Ma.
Keywords:
81-552A; Counting 〉149 µm fraction; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Foraminifera, benthic; Foraminifera, planktic; Foraminifera, planktic, fragments; Foraminifera, planktic, other; Foraminifera, planktic reworked; Globigerina bulloides; Globigerina digitata; Globigerina eamesi; Globigerina falconensis; Globigerina incisa; Globigerina praedigitata; Globigerina pseudobesa; Globigerina sp.; Globigerina woodi; Globigerinella aequilateralis; Globigerinita glutinata; Globigerinoides obliquus; Globigerinoides ruber; Globigerinoides spp.; Globorotalia conomiozea; Globorotalia crassaformis; Globorotalia hirsuta; Globorotalia inflata; Globorotalia margaritae; Globorotalia menardii; Globorotalia scitula; Glomar Challenger; Ice rafted debris; Leg81; Neogloboquadrina acostaensis; Neogloboquadrina atlantica dextral; Neogloboquadrina atlantica sinistral; Neogloboquadrina pachyderma dextral; Neogloboquadrina pachyderma sinistral; North Atlantic/PLATEAU; Orbulina universa; Sample code/label; Turborotalia quinqueloba
Type:
Dataset
Format:
text/tab-separated-values, 4587 data points
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