Changeset 251

Timestamp:

09/12/12 18:45:25 (12 years ago)

Author:

pinsard

Message:

add a new entry from HAL

File:

• branches/bibliolocean/data/biblioref.bib (modified) (1 diff)

branches/bibliolocean/data/biblioref.bib

@@ -3 +3 @@
 
 @PREAMBLE{"Bibliographie du LOCEAN"}
+
+@article{ZocatelliTurcEtAl:PPP:2012,
+hal_id = {insu-00730933},
+url = {http://hal-insu.archives-ouvertes.fr/insu-00730933},
+title = {{Late Holocene paleoenvironmental changes in Northeast Brazil recorded by organic matter in lacustrine sediments of Lake Boqueir{\\~a}o}},
+loceanbibid = {01733},
+loceanaffectation = {ird},
+loceanteam = {paleoproxus},
+aeresteam = {paleoproxus},
+timestamp = {20120912},
+author = {Renata Zocatelli and {B}runo {T}urcq and Mohammed Boussafir and R.C. Cordeiro and Jean-Robert Disnar and R.L. Costa and {A}bdelfettah {S}ifeddine and Ana Luiza Spadano Albuquerque and M.C. Bernardes and and Jérémy Jacob},
+abstract = {{Northeast Brazil represents a key area in terms of Holocene environmental changes in South America due to its distinct semi-arid climate at near equatorial latitudes as well as to a wetter Early and Middle Holocene paleoclimate in comparison with other South America regions, which also experienced a reduced monsoon at that time. We studied the lacustrine sediments of Lake Boqueir{\\~a}o, which is located at 5\degreS latitude on the Brazilian Atlantic coast; it is directly influenced by displacement of the Intertropical Convergence Zone (ITCZ). A short (1 m) core "Boqc0701" was collected at a 7.5 m water depth during a seismic survey. Organic matter (OM) geochemical [Rock Eval Total Organic Carbon (TOC), Hydrogen Index (HI), Oxygen Index (OI)] and petrographical studies allowed us to distinguish five sedimentary intervals during the last 3 kyrs. Phase E (3000 to 2050 cal yr BP) presents the largest TOC, HI and OI fluctuations in the entire core. The most probable cause of these variations is a great instability in the lake level during this period. Phase D (2050 to 1830 cal yr BP) is marked by an increase in sedimentation rate and a higher contribution from a well-preserved OM with an algal origin; this was interpreted as a higher and more stable lake level. During phase C (1830 to 1550 cal yrs BP), low HI and high OI indicate the input of more oxidized, degraded and detrital OM, reflecting a lower lake level. In phase B (1550 to 1470 cal yr BP), the OM quality and quantity (HI and TOC) indicate an algal contribution. During phase A (1470 to 570 cal yr BP), the high stability of the proxies may be due to a deep environment where OM fluctuations are strongly buffered. These changes in lake level can be compared with other tropical South America high resolution records. A correspondence seems to exist between phases of low ENSO, cool North Atlantic Ocean and Boqueir{\\~a}o wet phases. We did not encounter this same pattern during the last 1050 yaers, during which the 1050-570 cal yrs BP interval was generally wet (although probable fluctuations are buffered in our proxies) while the North Atlantic was warm (Mann et al., 2009). A prolonged dryness occurred in Lake Boqueir{\\~a}o from 570 cal yrs BP until recent decades. This phase corresponds to the Little Ice Age characterized by a cooler North Atlantic Ocean (Mann et al., 2009). These data indicate that the teleconnection pattern between the tropical Atlantic, ENSO and Northeast Brazil rainfalls has changed in the past.}},
+keywords = {Rock-Eval, organic petrography, macrophytes, algal, intertropical convergence.},
+language = {Anglais},
+affiliation = {Institut des Sciences de la Terre d'Orl{\'e}ans - ISTO , LMI "PALEOTRACES" , Laboratoire d'Oc{\'e}anographie et du Climat : Exp{\'e}rimentations et Approches Num{\'e}riques - LOCEAN , Departamento de Geoqu{\'\i}mica , Departamento de Geoquimica - DEPARTAMENTO DE GEOQUIMICA},
+pages = {24 p.},
+journal = {Palaeogeography, Palaeoclimatology, Palaeoecology},
+volume = {Accepted manuscript},
+note = {ANR ELPASO (2008 blanc 60801)},
+audience = {internationale},
+doi = {10.1016/j.palaeo.2012.08.021},
+year = {2012},
+pdf = {http://hal-insu.archives-ouvertes.fr/insu-00730933/PDF/zocatelli.pdf},
+}
 
 @inproceedings{MeynadierDecoetlogon:hal-00723384,