Μονάδα:
Ερευνητικό υλικό ΕΚΠΑΤμήμα Γεωλογίας και Γεωπεριβάλλοντος
Τίτλος:
Deep-sea benthic foraminifera record of the last 1500 years in the NorthAegean Trough (northeastern Mediterranean): A paleoclimaticreconstruction scenario
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
A 1500-year, high-resolution deep-sea benthic foraminifera record from
the Athos Basin of the North Aegean Trough (northeastern Mediterranean)
has been analyzed for the development of a paleoclimatic scenario. The
data analysis points out that the quantity and quality of the seafloor's
organic matter could be a crucial controlling factor for the faunal
succession. During 550-1000 AD (within the Medieval Climate Anomaly),
the relatively high benthic foraminiferal accumulation rates together
with the predominance of meso-eutrophic taxa, such as Bolivina
dilatata/spathulata, may be interpreted as the result of high
precipitation. Consequently, increased riverine discharges into the
North Aegean Sea and the associated warm climatic conditions appear to
persist for a long time and are related to a negative phase of the North
Atlantic Oscillation. Later on, the establishment of an
oligo-mesotrophic seafloor environment is documented by the diminishing
benthic foraminiferal accumulation rates associated with an increment in
the abundances of Gyroidinotdes altiformis. During a colder phase of the
Little Ice Age (17th century), the relative abundances of the
opportunistic foraminiferal species Bulimina inflate and Bulimina
marginata can be related to high marine productivity, most probably due
to enhanced winter mixing conditions. Finally, during the last 100
years, a faunal shift to eutrophication preferent species, and the
persistent occurrence of Chilostomella mediterranensis, reflects a
pronounced change in trophic conditions, characterized by high amounts
of potentially low-quality organic matter in the seafloor, which are the
result of a gradual temperature increase accompanied with enhanced
terrigenous inputs.
Συγγραφείς:
Dimiza, M. D.
Fatourou, M.
Arabas, A.
Panagiotopoulos, I and
Gogou, A.
Kouli, K.
Parinos, C.
Rousakis, G. and
Triantaphyllou, V, M.
Περιοδικό:
Deep Sea Research Part II: Topical Studies In Oceanography
Εκδότης:
PERGAMON-ELSEVIER SCIENCE LTD
Λέξεις-κλειδιά:
Benthic foraminifera variation; Organic matter fluxes; Major climatic
events
DOI:
10.1016/j.dsr2.2019.104705
