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A centennial scale organic-walled dinoflagellate cyst record of the last deglaciation in the South Adriatic Sea (Central Mediterranean) (Articolo in rivista)

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A centennial scale organic-walled dinoflagellate cyst record of the last deglaciation in the South Adriatic Sea (Central Mediterranean) (Articolo in rivista) (literal)

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Sangiorgi F. (1), Capotondi L. (2), Brinkhuis H.(3) (2002)
A centennial scale organic-walled dinoflagellate cyst record of the last deglaciation in the South Adriatic Sea (Central Mediterranean)
in Palaeogeography, palaeoclimatology, palaeoecology; ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, AMSTERDAM (Paesi Bassi)
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Sea Surface Temperature and Sea Surface Productivity records based on organic-walled dinocyst from the South Adriatic Sea spanning the last deglaciation show that marked changes occurred in the upper water column. Temperature fluctuations are in good correlation with those recorded in the North Atlantic region by the Greenland ice-core records, and match previous findings. An exception is the GI-1a (warm) interval, which appears to be weaker in the surface Mediterranean waters. South Adriatic Sea waters have experienced several important productivity fluctuations during the last deglaciation. In particular, during cold events GI-1d and GI-1b, sea surface primary productivity increased, probably due to episodes of freshwater (Po river) discharge, more evident for GI-1d event than for GI-1b. At the same time, a better preservation at the sea floor seems to have occurred. During these cold spells deep water masses were characterised by reduced ventilation. The highest increase in primary productivity occurred at 13.4 kyr BP (GI-1c) due to another freshwater discharge episode. A well-defined shift in the Protoperidinium spp. concentration and relative abundance and in total dinocyst concentration trends starting from ~9.50 kyr BP seems to underline that productivity and/or preservation connected to the onset of sapropel S1 deposition began some 400 years before the inception of organic rich deposits. (literal)

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1- Centro Interdipartimentale di Ricerca per le Scienze Ambientali Univ.Bologna, Sede di Ravenna Italy 2- ISMAR-CNR Bologna Italy 3- Utrecht University - The Netherlands (literal)

Titolo

A centennial scale organic-walled dinoflagellate cyst record of the last deglaciation in the South Adriatic Sea (Central Mediterranean) (literal)

Abstract

A high-resolution study of sea surface temperature (SST) and primary productivity (SSP) changes during the last deglaciation in the South Adriatic Sea is presented on the basis of organic-walled dinoflagellate cysts (dinocysts), compared with stable oxygen and carbon isotope records derived from Globigerina bulloides. Two more defined warming phases between 14.75 and 14.10 cal. kyr BP (GI-1e) and between 13.85 and 13.25 cal. kyr BP (GI-1c) and, perhaps, a mild one between 12.95 and 12.60 cal. kyr BP (GI-1a), interrupted by two cold events between 14.10 and 13.85 cal. kyr BP (GI-1d) and between 13.25 and 12.95 cal. kyr BP (GI-1b) are highlighted. Weaker SST oscillations occurred within the relatively stable periods GS-2a (17.00 14.75 cal. kyr BP), GS-1 (or Younger Dryas, 12.60 11.60 cal. kyr BP) and Early Holocene. Several dinocyst proxies used to evaluate surface primary productivity suggest that the cold events GI-1d and GI-1b are associated with episodes of both enhanced primary productivity and, perhaps, improved organic matter preservation due to reduced deep water formation. Phase of more pronounced increased surface primary productivity without stagnation in bottom waters are recorded during GI-1c and early GS-1. Freshwater (Po river) discharge seems to be the cause of enhanced productivity during event GI-1c (at 13.4 cal. kyr BP) and, probably, during GI-1d. (literal)

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