Publication Date:
2024-07-01
Description:
The response of the tropical ocean to global climate change and the extent of sea ice in the glacial nordic seas belong to the great controversies in paleoclimatology. Our new reconstruction of peak glacial sea surface temperatures (SSTs) in the Atlantic is based on census counts of planktic foraminifera, using the Maximum Similarity Technique Version 28 (SIMMAX-28) modern analog technique with 947 modern analog samples and 119 well-dated sediment cores. Our study compares two slightly different scenarios of the Last Glacial Maximum (LGM), the Environmental Processes of the Ice Age: Land, Oceans, Glaciers (EPILOG), and Glacial Atlantic Ocean Mapping (GLAMAP 2000) time slices. The comparison shows that the maximum LGM cooling in the Southern Hemisphere slightly preceeded that in the north. In both time slices sea ice was restricted to the north western margin of the nordic seas during glacial northern summer, while the central and eastern parts were ice-free. During northern glacial winter, sea ice advanced to the south of Iceland and Faeroe. In the central northern North Atlantic an anticyclonic gyre formed between 45° and 60°N, with a cool water mass centered west of Ireland, where glacial cooling reached a maximum of 〉12°C. In the subtropical ocean gyres the new reconstruction supports the glacial-to-interglacial stability of SST as shown by CLIMAP Project Members (CLIMAP) [1981]. The zonal belt of minimum SST seasonality between 2° and 6°N suggests that the LGM caloric equator occupied the same latitude as today. In contrast to the CLIMAP reconstruction, the glacial cooling of the tropical east Atlantic upwelling belt reached up to 6°–8°C during Northern Hemisphere summer. Differences between these SIMMAX-based and published U37[k]- and Mg/Ca-based equatorial SST records are ascribed to strong SST seasonalities and SST signals that were produced by different planktic species groups during different seasons.
Keywords:
06MT15_2; 122-2; 371; 381; 383; 388; A150/180; A180-72; A180-73; A180-76; A180-78; A181/185; A181-7; A181-9; Aegir Ridge, Norwegian-Greenland Sea; Amazon Fan; Angola Basin; Antarctic Ocean; ANT-IV/1c; Arctic Ocean; ARK-II/4; ARK-II/5; ARK-III/3; ARK-IV/3; ARK-IX/4; ARK-V/2; ARK-V/3b; ARK-VII/3b; ARK-VIII/2; ARK-X/2; Atlantic Ocean; AWI_Paleo; Barents Sea; BC; BCR; Bear Island Fan; Biscaya; BOFS11882#4; BOFS11886#2; BOFS11896#1; BOFS11902#1; BOFS11905#1; BOFS14K; BOFS16K; BOFS17K; BOFS31/1K; BOFS31#1; BOFS5K; BOFS8K; Bottle, Niskin; Box corer; Box corer (Reineck); Brazil Basin; CALYPSO; Calypso Corer; Cape Basin; Cardno Seamount; CD53; CEPAG; Charles Darwin; CIRCE; CIRCE-239; Congo Fan; CTD/Rosette; CTD-RO; D184; Denmark Strait; Discovery (1962); East Atlantic; East Brazil Basin; Eastern Rio Grande Rise; eastern Romanche Fracture Zone; East Greenland Sea; Equatorial Atlantic; FFC; FGGE-Equator 79 - First GARP Global Experiment; Fram Strait; Free fall corer; GeoB1009-3; GeoB1017-3; GeoB1025-2; GeoB1026-2; GeoB1027-2; GeoB1028-4; GeoB1029-1; GeoB1030-3; GeoB1031-2; GeoB1032-2; GeoB1033-3; GeoB1034-2; GeoB1035-3; GeoB1036-3; GeoB1039-1; GeoB1040-3; GeoB1041-3; GeoB1044-3; GeoB1046-2; GeoB1047-3; GeoB1101-4; GeoB1103-3; GeoB1104-4; GeoB1105-4; GeoB1106-4; GeoB1108-7; GeoB1109-3; GeoB1110-4; GeoB1111-3; GeoB1112-4; GeoB1113-4; GeoB1114-4; GeoB1116-2; GeoB1117-2; GeoB1203-2; GeoB1204-3; GeoB1207-2; GeoB1208-1; GeoB1209-1; GeoB1210-3; GeoB1211-1; GeoB1215-1; GeoB1216-2; GeoB1217-1; GeoB1218-1; GeoB1220-2; GeoB1306-1; GeoB1306-2; GeoB1307-2; GeoB1308-1; GeoB1309-3; GeoB1310-1; GeoB1311-2; GeoB1312-3; GeoB1313-1; GeoB1403-2; GeoB1405-7; GeoB1407-7; GeoB1408-3; GeoB1413-2; GeoB1414-2; GeoB1415-1; GeoB1418-1; GeoB1419-1; GeoB1420-1; GeoB1503-2; GeoB1504-1; GeoB1505-3; GeoB1506-1; GeoB1508-1; GeoB1509-2; GeoB1510-1; GeoB1511-6; GeoB1512-2; GeoB1513-2; GeoB1514-4; GeoB1516-1; GeoB1518-1; GeoB1519-2; GeoB1520-1; GeoB1521-2; GeoB1522-1; GeoB1523-2; GeoB1701-1; GeoB1702-6; GeoB1704-1; GeoB1705-2; GeoB1710-2; GeoB1711-5; GeoB1712-2; GeoB1713-6; GeoB1716-2; GeoB1719-5; GeoB1722-3; GeoB1725-1; GeoB1728-3; GeoB1729-1; GEOTROPEX 83, NOAMP I; Giant box corer; GIK10720-1; GIK10737-1; GIK10749-1; GIK12307-4; GIK12309-2; GIK12310-3; GIK12310-4; GIK12326-4; GIK12328-1; GIK12328-5; GIK12329-1; GIK12329-6; GIK12336-1; GIK12337-5; GIK12344-2; GIK12345-5; GIK12347-2; GIK12379-1; GIK12392-1; GIK13255-2; GIK13289-3; GIK13291-1; GIK13519-1; GIK13521-1; GIK13530-1; GIK13534-1; GIK13586-3; GIK13587-1; GIK13588-2; GIK15612-2; GIK15627-1; GIK15627-3; GIK15628-1; GIK15628-4; GIK15634-1; GIK15635-2; GIK15636-1; GIK15637-1; GIK15638-2; GIK15639-1; GIK15640-1; GIK15641-2; GIK15642-1; GIK15644-1; GIK15645-1; GIK15646-1; GIK15651-1; GIK15654-1; GIK15657-1; GIK15659-1; GIK15663-2; GIK15664-1; GIK15666-9; GIK15667-1; GIK15668-1; GIK15669-1; GIK15669-2; GIK15672-2; GIK15673-2; GIK15676-2; GIK15677-1; GIK15678-1; GIK15679-1; GIK16017-2; GIK16396-1; GIK16397-2; GIK16401-2; GIK16402-1; GIK16403-1; GIK16407-1; GIK16408-2; GIK16410-1; GIK16411-1; GIK16412-1; GIK16413-1; GIK16415-1; GIK16415-2; GIK16416-1; GIK16417-1; GIK16419-1; GIK16420-1; GIK16421-1; GIK16430-2; GIK16432-2; GIK16437-3; GIK16453-2; GIK16455-1; GIK16457-1; GIK16457-2; GIK16458-1; GIK16458-2; GIK16756-1; GIK16757-1; GIK16768-1; GIK16771-1; GIK16772-1; GIK16772-2; GIK16773-2; GIK16774-3; GIK16775-2; GIK16776-1; GIK16777-1; GIK16779-1; GIK16780-1; GIK16846-1; GIK16855-1; GIK16856-1; GIK16864-1; GIK16865-1; GIK16867-2; GIK16868-2; GIK16870-1; GIK16871-1; GIK16872-1; GIK17045-2; GIK17045-3; GIK17048-3; GIK17049-6; GIK17050-1; GIK17051-2; GIK17051-3; GIK17052-4; GIK17054-1; GIK17055-1; GIK17056-1; GIK17724-2; GIK17725-1; GIK17730-4; GIK21289-1 PS07/578; GIK21290-3 PS07/579; GIK21291-3 PS07/581; GIK21292-3 PS07/582; GIK21293-3 PS07/583; GIK21294-3 PS07/584; GIK21295-4 PS07/586; GIK21296-3 PS07/587; GIK21298-3 PS07/590; GIK21299-1 PS07/591; GIK21301-2 PS07/593; GIK21309-3 PS07/602; GIK21310-4 PS07/603; GIK21311-3 PS07/605; GIK21312-3 PS07/606; GIK21313-3 PS07/607; GIK21318-4 PS07/615; GIK21529-7 PS11/376-7; GIK21530-3 PS11/382-3; GIK21532-1 PS11/396-1; GIK21533-3 PS11/412; GIK21534-6 PS11/423-6; GIK21535-5 PS11/430-5; GIK21706-1 PS13/147; GIK21707-1 PS13/149; GIK21730-2 PS13/224; GIK23037-2; GIK23039-3; GIK23041-1; GIK23042-1; GIK23043-3; GIK23044-1; GIK23056-2; GIK23058-2; GIK23059-2; GIK23060-2; GIK23065-2; GIK23067-2; GIK23068-2; GIK23070-2; GIK23071-2; GIK23071-3; GIK23073-2; GIK23074-1; GIK23229-1 PS05/414; GIK23230-1 PS05/416; GIK23231-2 PS05/417; GIK23232-1 PS05/418; GIK23235-1 PS05/422; GIK23238-1 PS05/426; GIK23239-1 PS05/427; GIK23241-1 PS05/429; GIK23243-1 PS05/431; GIK23244-1 PS05/449; GIK23246-1 PS05/451; GIK23249-1 PS05/454; GIK23262-2; GIK23266-1; GIK23267-2; GIK23269-2; GIK23270-2; GIK23277-1; GIK23279-1; GIK23289-2; GIK23291-1; GIK23293-1; GIK23294-3; GIK23294-4; GIK23295-2; GIK23295-4; GIK23297-1; GIK23298-2; GIK23300-2; GIK23309-1; GIK23312-2; GIK23313-2; GIK23316-3; GIK23332-4; GIK23335-4; GIK23341-3; GIK23342-3; GIK23343-4; GIK23344-3; GIK23347-4; GIK23351-1; GIK23352-2; GIK23353-2; GIK23354-4; GIK23354-6; GIK23359-2; GIK23361-7; GIK23362-1; GIK23363-1; GIK23364-6; GIK23365-1; GIK23368-1; GIK23369-1; GIK23370-1; GIK23371-1; GIK23373-1; GIK23390-1; GIK23398-1; GIK23398-2; GIK23400-1; GIK23400-3; GIK23402-2; GIK23413-3; GIK23414-7; GIK23417-7; GIK23418-6; GIK23419-8; GIK23467-2; GIK23477-1; GIK23478-2; GIK23480-2; GIK23483-2; GIK23488-2; GIK23489-2; GIK23498-1; GIK23500-1; GIK23502-1; GIK23503-1; GIK23505-1; GIK23506-1; GIK23507-1; GIK23508-1; GIK23509-1; GIK23510-1; GIK23511-2; GIK23512-1; GIK23516-1; GIK23517-3; GIK23518-2; GIK23519-4; GIK23519-5; GIK23522-2; GIK23523-3; GIK23524-2; GIK23525-3; GIK23526-3; GIK23527-3; GIK23528-3; GKG; Glacial Atlantic Ocean Mapping; GLAMAP2000; Gravity corer (Kiel type); Greenland Sea; Greenland Slope; Guinea Basin; Hunter Channel; Iceland Sea; IMAGES; IMAGES I; Indian Ocean; INMD; INMD-042BX; INMD-050BX; INMD-055BX; INMD-065BX; INMD-068BX; INMD-069BX; International Marine Global Change Study; Jan Mayen Fracture Zone; KAL; Kasten corer; KL; KOL; Le Suroît; M10/3; M11/1; M12/1; M12392-1; M13/2; M15/2; M16/1; M16/2; M17/1; M17/2; M19; M2/1; M2/2; M20/2; M21/5; M23414; M25; M26/3; M30; M30_183; M39; M51; M527; M53; M53_164; M53_166; M53_167; M53_168-1; M53_169; M53_172-1; M53_173-2; M57; M6/5; M6/6; M60; M65; M7/2; M7/3; M7/4; M7/5; M9/4; Marion Dufresne (1995); MD101; MD952011; MD95-2011; MD952012; MD95-2012; MD952039; MD95-2039; MD952040; MD95-2040; Melville; Meteor (1964); Meteor (1986); Mid Atlantic Ridge; MSN; MUC; MultiCorer; Multiple opening/closing net; Namibia Continental Margin; Namibia continental slope; NIS; North Atlantic; Northeast Atlantic; Northern Guinea Basin; Norwegian-Greenland Sea; Norwegian Sea; off eastern Ghana; off Gabun; off Guinea; off Iceland; off Liberia; off Nigeria; off Nigeria-Delta; off Portugal; off West Africa; PALEOCINAT; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; PC; Piston corer; Piston corer (BGR type); Piston corer (Kiel type); PLA; Plankton net; PO158/B; Polarstern; Porto Seamount; POS158/2; POS210/2; Poseidon; PS05; PS07; PS08; PS11; PS1229-1; PS1230-1; PS1231-2; PS1232-1; PS1235-1; PS1238-1; PS1239-1; PS1241-1; PS1243-1; PS1244-1; PS1246-1; PS1249-1; PS1289-1; PS1290-3; PS1291-3; PS1292-3; PS1293-3; PS1294-3; PS1295-4; PS1296-3; PS1298-3; PS1299-1; PS13; PS1301-2; PS1309-3; PS1310-4; PS1311-3; PS1312-3; PS1313-3; PS1318-4; PS13 GRÖKORT; PS1529-7; PS1530-3; PS1532-1; PS1533-3; PS1534-6; PS1535-5; PS17; PS17/242; PS17/245; PS17/251; PS17/290; PS1706-1; PS1707-1; PS1730-2; PS19/100; PS19/112; PS1919-2; PS1922-1; PS1927-2; PS1951-1; PS19 EPOS II; PS2129-1; PS2138-1; PS2446-4; PS2613-1; PS2613-6; PS2616-7; PS2627-5; PS2644-5; PS2656-2; PS27; PS27/020; PS31; PS31/113; PS31/116; PS31/135; PS31/160-5; PS31/182; RC08; RC08-16; RC08-18; RC08-22; RC08-23; RC08-27; RC08-28; RC09; RC09-212; RC09-222; RC09-225; RC09-61; RC10; RC10-22; RC10-
Type:
Dataset
Format:
application/zip, 4 datasets
