期刊
ENVIRONMENTAL POLLUTION
卷 157, 期 8-9, 页码 2335-2344出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.03.025
关键词
Biological proxies; Bryophytes; p-Coumaroylmalic acid; Reconstruction; UV-absorbing compounds
资金
- Fondo Europeo de Desarrollo Regional, FEDER [CGL2008-04450]
We analyzed bulk UV absorbance of methanolic extracts and levels of five UV-absorbing compounds (hydroxycinnamic acid derivatives) in 135 herbarium samples of the liverwort-Jungermannia exsertifolia subsp. cordifolia from northern Europe. Samples had been collected in 1850-2006 (96% in June-August). Both UV absorbance and compound levels were correlated positively with collection year. p-Coumaroylmalic acid (C1) was the only compound showing a significant (and negative) correlation with stratospheric ozone and UV irradiance in the period that real data of these variables existed. Stratospheric ozone reconstruction (1850-2006) based on C1 showed higher values in June than in July and August, which coincides with the normal monthly variation of ozone. Combining all the data, there was no long-term temporal trend from 1850 to 2006. Reconstructed UV showed higher values in June-July but again no temporal trend was detected in 1918-2006 using the joint data. This agrees than in August, with previous UV reconstructions. (C) 2009 Elsevier Ltd. All rights reserved.
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