Sea surface temperature record of a Late Cretaceous tropical Southern Tethys upwelling system

Late Cretaceous Temperature Evolution of the Southern High Latitudes: A TEX86 Perspective

“…Taken together, the data suggest that peak warmth occurred in the early Turonian, followed by a long‐term cooling trend into the Santonian and Campanian (Figure ). This trend is comparable to low latitude and midlatitude TEX 86 records that also show a slow decline in SSTs through to the late Campanian (Alsenz et al, ; Forster et al, ; Linnert et al, ). Around the Cenomanian–Turonian boundary, many sites yield very similar TEX 86 values, as the proxy is close to the upper limit (TEX 86 = 1) in the low latitudes (as also noted by O'Brien et al, ; Robinson et al, ; Sinninghe Damsté et al, ).…”

“…To explore this inconsistency further, it is useful to contextualize these data by comparison with other late Campanian TEX 86 records. One data point from Site 327 is almost as high as data from Shuqualak (Figure ), which lies at ~35°N (Linnert et al, ), whereas other samples from Site 327 have TEX 86 values as low as those from the PAMA Quarry in Israel (0° latitude; Alsenz et al, ). It has been suggested that the depositional environment at the PAMA Quarry was influenced by upwelling (Alsenz et al, ).…”

“…All oxygen‐isotope values are reported relative to VPDB. 1 Huber et al (); 2 Huber et al (); 3 Barrera and Savin (); 4 Friedrich et al (); 5 Barrera and Huber (); 6 Falzoni et al (); 7 Clarke and Jenkyns (); 8 Ando et al (); 9 Woelders et al (); 10 Bice et al (); 11 Forster et al (); 12 Schouten et al (); 13 Bornemann et al (); 14 Sinninghe Damsté et al (); 15 Robinson et al (); 16 Alsenz et al (); 17 van Helmond et al (); 18 Linnert et al (); 19 van Helmond et al (); 20 Woelders et al (). All age models from original sources, plotted on the 2016 timescale (Ogg et al, ).…”

Palynological evidence for prolonged cooling along the Tunisian continental shelf following the K–Pg boundary impact

“…23 pulsating nature might be related to the presence of the North-Central Africa upwelling belt close to the studied sites (Parrish and Curtis, 1982;Huber and Sloan, 2001;Galeotti et al, 2004;Alsenz et al, 2013). A short impact winter, with a maximum duration of several decades, will have caused a rapid cooling of the global surface oceans, resulting in the formation of cold deep waters (Galeotti et al, 2004;see Fig.…”

The Late Mesozoic‐Cenozoic Arctic Ocean Climate and Sea Ice History: A Challenge for Past and Future Scientific Ocean Drilling

“…The Mesozoic to Cenozoic time interval is a period when the climate on Earth changed from one extreme (Cretaceous‐Paleogene Greenhouse lacking major ice sheets) to another (Neogene Icehouse with bipolar glaciation; Figure ; Pearson & Palmer, ; Norris et al, ; Zachos et al, ; Friedrich et al, ; Kent & Muttoni, ; O'Brien et al, ; O'Connor et al, ). This long‐term climatic evolution, including prominent warm and cold phases, is best reflected in marine deep‐water and surface‐water temperatures determined from benthic and planktic oxygen isotope, Mg/Ca thermometry, and biomarker (TEX 86 and U K 37 ) records, respectively, from low to middle latitudes (e.g., Alsenz et al, ; Bijl et al, ; Friedrich et al, ; Lear et al, ; Littler et al, ; Liu et al, ; Miller et al, ; Mutterlose et al, ; O'Brien et al, ; Zachos et al, ; Zachos et al, ). Peak warm intervals occurred around the Cenomanian/Turonian boundary, during the Paleocene‐Eocene Thermal Maximum (PETM), the Early Eocene Climate Optimum (EECO), and the Middle Eocene Climate Optimum (Figure ), most probably related to higher atmospheric CO 2 concentrations.…”