DOI: 10.5194/cp-10-939-2014
Scopus记录号: 2-s2.0-84921508282
论文题名: Orbital- and millennial-scale environmental changes between 64 and 20 ka BP recorded in Black Sea sediments
作者: Shumilovskikh L.S. ; Fleitmann D. ; Nowaczyk N.R. ; Behling H. ; Marret F. ; Wegwerth A. ; Arz H.W.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2014
卷: 10, 期: 3 起始页码: 939
结束页码: 954
语种: 英语
Scopus关键词: alga
; arid environment
; bioindicator
; calcium carbonate
; cyst
; Dansgaard-Oeschger cycle
; dinoflagellate
; environmental change
; global warming
; Heinrich event
; humid environment
; marine sediment
; pollen
; primary production
; reconstruction
; refugium
; sea surface temperature
; steppe
; vegetation structure
; Anatolia
; Atlantic Ocean
; Atlantic Ocean (North)
; Black Sea
; Caspian Sea
; Turkey
; Acritarcha
; algae
; Artemisia
; Botryococcus
; Dinophyceae
; Pediastrum
; Pyxidinopsis psilata
; Spiniferites cruciformis
英文摘要: High-resolution pollen and dinoflagellate cyst records from sediment core M72/5-25-GC1 were used to reconstruct vegetation dynamics in northern Anatolia and surface conditions of the Black Sea between 64 and 20 ka BP. During this period, the dominance of Artemisia in the pollen record indicates a steppe landscape and arid climate conditions. However, the concomitant presence of temperate arboreal pollen suggests the existence of glacial refugia in northern Anatolia. Long-term glacial vegetation dynamics reveal two major arid phases ∼64-55 and 40-32 ka BP, and two major humid phases ∼54-45 and 28-20 ka BP, correlating with higher and lower summer insolation, respectively. Dansgaard-Oeschger (D-O) cycles are clearly indicated by the 25-GC1 pollen record. Greenland interstadials are characterized by a marked increase in temperate tree pollen, indicating a spread of forests due to warm/wet conditions in northern Anatolia, whereas Greenland stadials reveal cold and arid conditions as indicated by spread of xerophytic biomes. There is evidence for a phase lag of ∼500 to 1500 yr between initial warming and forest expansion, possibly due to successive changes in atmospheric circulation in the North Atlantic sector. The dominance of Pyxidinopsis psilata and Spiniferites cruciformis in the dinocyst record indicates brackish Black Sea conditions during the entire glacial period. The decrease of marine indicators (marine dinocysts, acritarchs) at ∼54 ka BP and increase of freshwater algae (Pediastrum, Botryococcus) from 32 to 25 ka BP reveals freshening of the Black Sea surface water. This freshening is possibly related to humid phases in the region, to connection between Caspian Sea and Black Sea, to seasonal freshening by floating ice, and/or to closer position of river mouths due to low sea level. In the southern Black Sea, Greenland interstadials are clearly indicated by high dinocyst concentrations and calcium carbonate content, as a result of an increase in primary productivity. Heinrich events show a similar impact on the environment in the northern Anatolia/Black Sea region as Greenland stadials. © Author(s) 2014. 资助项目: DFG, Deutsche Forschungsgemeinschaft
; DFG, Deutsche Forschungsgemeinschaft
; DFG, Deutsche Forschungsgemeinschaft
; DFG, Deutsche Forschungsgemeinschaft
; SNSF, Deutsche Forschungsgemeinschaft
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49269
Appears in Collections: 气候变化与战略
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Recommended Citation:
Shumilovskikh L.S.,Fleitmann D.,Nowaczyk N.R.,et al. Orbital- and millennial-scale environmental changes between 64 and 20 ka BP recorded in Black Sea sediments[J]. Climate of the Past,2014-01-01,10(3)