PUMA
Istituto di Scienze Marine     
Tisnerat-Laborde N., Montagna P., McCulloch M., Siani G., Silenzi S., Frank N. A HIGH-RESOLUTION CORAL-BASED Delta C-14 RECORD OF SURFACE WATER PROCESSES IN THE WESTERN MEDITERRANEAN SEA. In: RADIOCARBON, vol. 55 (2-3) pp. 1617 - 1630. UNIV ARIZONA DEPT GEOSCIENCES, RADIOCARBON 4717 E FORT LOWELL RD, TUCSON, AZ 85712 USA, 2013.
 
 
Abstract
(English)
The first high-resolution time series of pre- and post-bomb radiocarbon measurements is reported for surface waters in the western Mediterranean Sea. The Delta C-14 record was obtained from the aragonite skeleton of Cladocora caespitosa using a 50-yr-old corallite collected in the Ligurian Sea in 1998. Laser-ablation ICP measurements of trace elements (Li/Mg and Sr/Ca) show a strong seasonal variability, enabling the chronology of the Delta C-14 record to be determined at annual time-scales. The mean Delta C-14 of pre-bomb surface water is -56 +/- 3%, corresponding to a reservoir age of 262 +/- 29 yr. The post-bomb maximum occurs in 1972 with a Delta C-14 value of 90 parts per thousand, significantly lower than the peak of 150 parts per thousand observed in the North Atlantic. The dilution of the peak-amplitude of Delta C-14 in western Mediterranean surface waters is attributed to mixing of North Atlantic Central Water inflow with relatively depleted underlying Intermediate Mediterranean and Levantine Intermediate waters. Intensification of this mixing is observed in 1963-1964, consistent with the change in atmospheric circulation from a positive to negative NAO phase (1960-1967). The post-peak Delta C-14 variability is relatively limited, reflecting mainly local vertical mixing forced by wind stress.
URL: http://https://journals.uair.arizona.edu/index.php/radiocarbon/article/download/16397/pdf
Subject RADIOCARBON AGE CALIBRATION; POST-BOMB RADIOCARBON; CLADOCORA-CAESPITOSA; NORTH-ATLANTIC; LIGURIAN SEA; SOUTHWESTERN PACIFIC; CLIMATE VARIABILITY; OCEAN RADIOCARBON; TIME HISTORY; C-14


Icona documento 1) Download Document PDF


Icona documento Open access Icona documento Restricted Icona documento Private

 


Per ulteriori informazioni, contattare: Librarian http://puma.isti.cnr.it

Valid HTML 4.0 Transitional