DOI: 10.1016/j.quascirev.2017.01.020
Scopus记录号: 2-s2.0-85011596201
论文题名: Large-scale response of the Eastern Mediterranean thermohaline circulation to African monsoon intensification during sapropel S1 formation
作者: Tesi T. ; Asioli A. ; Minisini D. ; Maselli V. ; Dalla Valle G. ; Gamberi F. ; Langone L. ; Cattaneo A. ; Montagna P. ; Trincardi F.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 159 起始页码: 139
结束页码: 154
语种: 英语
英文关键词: African monsoons
; Anoxia
; Mediterranean sea
; Sapropel S1
; Thermohaline circulation
Scopus关键词: Atmospheric thermodynamics
; Biogeochemistry
; Deposition
; African monsoons
; Anoxia
; Mediterranean sea
; Sapropel S1
; Thermohaline circulations
; Climate change
; anoxic conditions
; deep water ventilation
; foraminifera
; monsoon
; Northern Hemisphere
; paleoceanography
; paleoclimate
; proxy climate record
; sapropel
; thermohaline circulation
; water mass
; Adriatic Sea
; Ionian Sea
; Levantine Sea
; Mediterranean Sea
; North Africa
; Foraminifera
英文摘要: The formation of Eastern Mediterranean sapropels has periodically occurred during intensification of northern hemisphere monsoon precipitation over North Africa. However, the large-scale response of the Eastern Mediterranean thermohaline circulation during these monsoon-fuelled freshening episodes is poorly constrained. Here, we investigate the formation of the youngest sapropel (S1) along an across-slope transect in the Adriatic Sea. Foraminifera-based oxygen index, redox-sensitive elements and biogeochemical parameters reveal – for the first time – that the Adriatic S1 was synchronous with the deposition of south-eastern Mediterranean S1 beds. Proxies of paleo thermohaline currents indicate that the bottom-hugging North Adriatic Dense Water (NAdDW) suddenly decreased at the sapropel onset simultaneously with the maximum freshening of the Levantine Sea during the African Humid Period. We conclude that the lack of the “salty” Levantine Intermediate Water hampered the preconditioning of the northern Adriatic waters necessary for the NAdDW formation prior to the winter cooling. Consequently, a weak NAdDW limited in turn the Eastern Mediterranean Deep Water (EMDWAdriatic) formation with important consequences for the ventilation of the Ionian basin as well. Our results highlight the importance of the Adriatic for the deep water ventilation and the interdependence among the major eastern Mediterranean water masses whose destabilization exerted first-order control on S1 deposition. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59305
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: CNR-ISMAR, Consiglio Nazionale delle Ricerche, Istituto di Scienze Marine, Sede Bologna, Via Gobetti 101, Bologna, Italy; CNR-IGG, Consiglio Nazionale delle Ricerche, Istituto Geoscienze e Georisorse, Sede Padova, Via G. Gradenigo, 6, Padova, Italy; Shell International Exploration and Production Inc, 3333 Highway 6 South, Houston, TX, United States; Dept. of Geology and Petroleum Geology, University of Aberdeen, St. Mary's Building, King's College, Aberdeen, United Kingdom; IFREMER, Géosciences Marines-EDROME, Centre de Brest, BP70, Plouzané, France
Recommended Citation:
Tesi T.,Asioli A.,Minisini D.,et al. Large-scale response of the Eastern Mediterranean thermohaline circulation to African monsoon intensification during sapropel S1 formation[J]. Quaternary Science Reviews,2017-01-01,159