DOI: 10.5194/cp-9-1015-2013
Scopus记录号: 2-s2.0-84878162025
论文题名: Large spatial variations in coastal 14C reservoir age - A case study from the Baltic Sea
作者: Lougheed B.C. ; Filipsson H.L. ; Snowball I.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 3 起始页码: 1015
结束页码: 1028
语种: 英语
Scopus关键词: carbon flux
; coastal zone
; correlation
; estimation method
; hydrographic survey
; mollusc
; salinity
; spatial variation
; spatiotemporal analysis
; statistical analysis
; twentieth century
; Atlantic Ocean
; Baltic Sea
英文摘要: Coastal locations are highly influenced by input from freshwater river runoff, including sources of terrestrial carbon, which can be expected to modify the 14C reservoir age, or R(t), associated with marine water. In this Baltic Sea case study, pre-bomb museum collection mollusc shells of known calendar age, from 30 locations across a strategic salinity transect of the Baltic Sea, were analysed for 14C, λ13C and λ18O. R(t) was calculated for all 30 locations. Seven locations, of which six are within close proximity of the coast, were found to have relatively higher R(t) values, indicative of hard-water effects. Whenever possible, the Macoma genus of mollusc was selected from the museum collections, in order to exclude species specific reservoir age effects as much as possible. When the Macoma samples are exclusively considered, and samples from hard-water locations excluded, a statistically significant correlation between Macoma R(t) and average salinity is found, indicating a two end-member linear mixing model between 14Cmarine and 14Crunoff. A map of Baltic Sea Macoma aragonite R(t) for the late 19th and early 20th centuries is produced. Such a map can provide an estimate for contemporary Baltic Sea Macoma R(t), although one must exercise caution when applying such estimates back in time or to 14C dates obtained from different sample material. A statistically significant correlation is found between λ18Oaragonite and Macoma R(t), suggesting that λ18Oaragonite can be used to estimate Macoma palaeo-R(t), due to the λ18Oaragonite signal being dominated by the salinity gradient of the Baltic Sea. A slightly increased correlation can be expected when λ18Oaragonite is corrected for temperature fractionation effects. The results of this Baltic Sea case study, which show that R(t) is affected by hydrographic conditions and local carbon inputs, have important consequences for other coastal and estuarine locations, where R(t) is also likely to significantly vary on spatial and temporal bases. © 2013 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49462
Appears in Collections: 气候变化与战略
There are no files associated with this item.
Recommended Citation:
Lougheed B.C.,Filipsson H.L.,Snowball I.. Large spatial variations in coastal 14C reservoir age - A case study from the Baltic Sea[J]. Climate of the Past,2013-01-01,9(3)