DOI: 10.5194/cp-9-499-2013
Scopus记录号: 2-s2.0-84879794399
论文题名: Paleohydrology reconstruction and Holocene climate variability in the South Adriatic Sea
作者: Siani G. ; Magny M. ; Paterne M. ; Debret M. ; Fontugne M.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 1 起始页码: 499
结束页码: 515
语种: 英语
Scopus关键词: bottom water
; carbon isotope
; climate variation
; Holocene
; hydrological change
; Mediterranean environment
; oxygen isotope
; paleoclimate
; paleohydrology
; planktonic foraminifera
; radiocarbon dating
; reconstruction
; salinity
; sea surface temperature
; seawater
; stable isotope
; tephra
; Adriatic Sea
; Alps
; Apennines
; Atlantic Ocean
; Atlantic Ocean (North)
; Italy
; Mediterranean Sea
英文摘要: Holocene paleohydrology reconstruction is derived combining planktonic and benthic stable oxygen and carbon isotopes, sea surface temperatures (SSTs) and oxygen isotope composition of seawater (δ18Ow) from a high sedimentation core collected in the South Adriatic Sea (SAS). Core chronology is based on 10 AMS 14 C measures on planktonic foraminifera and tephra layers. Results reveal two contrasted paleohydrological periods that reflect (i) a marked lowering of δ18Ow/salinity during the early to mid-Holocene (11.5 ka to 6.3 ka), including the two-step sapropel S1 deposition, followed during the mid- to upper Holocene by (ii) a prevailing period of increased salinity and enhanced arid conditions in the South Adriatic Basin. Superimposed on these trends, short-term centennial-scale hydrological events punctuated the Holocene period in the SAS. During the early to mid-ology is based owith prominent δ18Ow/salinity lowering delineate the sapropel S1 interruption and the post-sapropel phase between 7.3 to 6.3 ka. After 6 ka, centennial-scale δ18O w and G. bulloides δ13C lowering, mostly centered between 3 to 0.6 ka, reflect short-term hydrological changes related to more intensive runoff of the Po and/or Apennine rivers. These short-term events, even of lesser amplitude compared to the early to mid-Holocene period, may have induced a lowering of sea surface density and consequently reduced and/or inhibited the formation of deep bottom waters in the SAS. Comparison of the emerging centennial- to millennial-scale hydrological record with previous climatic records from the central Mediterranean area and north of the Alps reveal possible synchronicities (within the radiocarbon-dating uncertainty) between phases of lower salinity in the SAS and periods of wetter climatic conditions around the north-central Adriatic Sea. Finally, wavelet analyses provide new clues about the potential origin of climate variability in the SAS, confirming the evidence for a mid-Holocene transition in the central Mediterranean climate and the dominance of a ∼1670-yr periodicity after 6 ka, reflecting a plausible connection with the North Atlantic climate system. © Author(s) 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49370
Appears in Collections: 气候变化与战略
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Recommended Citation:
Siani G.,Magny M.,Paterne M.,et al. Paleohydrology reconstruction and Holocene climate variability in the South Adriatic Sea[J]. Climate of the Past,2013-01-01,9(1)