FN Archimer Export Format PT J TI Thermal history of deep-sea sediments as a record of recent changes in the deep circulation of the eastern Mediterranean BT AF DELLA VEDOVA, B PELLIS, G CAMERLENGHI, A FOUCHER, Jean-Paul HARMEGNIES, Francois AS 1:;2:;3:;4:;5:; FF 1:;2:;3:;4:PDG-DRO-GM-GEOPHYSIQUE;5:PDG-DRO-GM; C1 Univ Trieste, Dipartimento Ingn Civile, Sez Georisorse & Ambiente, I-34127 Trieste, Italy. Ist Nazl Oceanog & Geofis Sperimentale, I-34016 Trieste, Italy. IFREMER, Ctr Brest, F-29280 Plouzane, France. C2 UNIV TRIESTE, ITALY IST NAZL OCEANOG & GEOFIS SPERIMENTALE, ITALY IFREMER, FRANCE SI BREST SE PDG-DRO-GM-GEOPHYSIQUE PDG-DRO-GM IN WOS Ifremer jusqu'en 2018 copubli-europe IF 2.992 TC 6 UR https://archimer.ifremer.fr/doc/00000/10675/9319.pdf LA English DT Article DE ;eastern Mediterranean;Aegean waters;sediment warming;heat flow measurements;thermal modeling;thermal history AB [1] During three cruises of the MEDRIFF project in 1993 and 1994, 154 geothermal heat flow measurements and seven CTD profiles in the water column have been collected along a 300 km SW-NE oriented transect traversing the Mediterranean Ridge accretionary complex. The original goal of the measurements was to identify areas of anomalous heat flow that could be interpreted as possible sites for fluid outflow. Contrary to expectations, the upper few meters of the temperature profiles in the sediments showed decreasing temperature from the seafloor down to 3 to 6 m depth indicating consistently transient temperature regimes. The only exception ( positive heat flow) was found in the Sirte abyssal plain. Measurements collected in the same area at different times indicated that the thermal structure in the bottom water and sediments had changed significantly at weekly, monthly, and interannual timescales. One-dimensional forward modeling of the conductive heat propagation into the sediment explains the observed thermal anomalies, assuming up to 0.5 K warming of the bottom waters that propagated south westward from the Matapan Trench to the crestal area of the Mediterranean Ridge. Analysis of nonsteady state thermal profiles in the upper sediment provided time information on the onset of bottom water warming, by what is now called the Eastern Mediterranean Transient (EMT). The sediment warming started in the Matapan Trench, between spring 1992 and spring 1993, and reached the Mediterranean Ridge crest in spring-summer 1993. The average propagation velocity of the thermal perturbation along the profile is about 0.5 - 1.6 km d(-1) (0.6 - 1.8 cm s(-1)). PY 2003 PD SEP SO Journal Of Geophysical Research Oceans SN 0148-0227 PU Amer Geophysical Union VL 108 IS C9 UT 000185478400001 DI 10.1029/2002JC001402 ID 10675 ER EF