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Twenty-year inter-annual trends and seasonal variations in precipitation and stream water chemistry at the Bear Brook Watershed in Maine, USA
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SYSNO ASEP 0348967 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Twenty-year inter-annual trends and seasonal variations in precipitation and stream water chemistry at the Bear Brook Watershed in Maine, USA Author(s) Navrátil, Tomáš (GLU-S) RID, SAI, ORCID
Norton, S. A. (US)
Fernandez, I. J. (US)
Nelson, S. J. (US)Source Title Environmental Monitoring and Assessment. - : Springer - ISSN 0167-6369
Roč. 171, 1/4 (2010), s. 23-45Number of pages 23 s. Publication form WWW - WWW Language eng - English Country NL - Netherlands Keywords Bear Brook Watershed in Maine ; precipitation chemistry ; stream chemistry ; seasonality ; long-term trends Subject RIV DD - Geochemistry CEZ AV0Z30130516 - GLU-S (2005-2011) UT WOS 000283592800003 EID SCOPUS 78149409692 DOI 10.1007/s10661-010-1527-z Annotation Mean annual concentrations of SO42- and NO3- in wet-only deposition have decreased between 1988 and 2006 at BBWM due to decreased emissions of SO2 and NOx. Base cations, NH4+ and Cl- concentrations mostly exhibited no trends or statistically significant trends but with change of < 1 ueq L-1 per year from 1988 to 2006. Seasonally, two chemically distinct periods of precipitation (April to September) and (October to March) indicate two different trajectories of air mass movement: dominantly continental sources in the warm season with increased SO42- and NH4+ and mixed continental and marine sources in the cool season with increased inputs of marine aerosols. The major factors driving seasonality of the streams are hydrology, vegetation activity, and temperature. The low flow periods June - October were typical with greater contribution of the deeper flow solutions and increased pH value, anion neutralizing capacity, Si concentration, non-marine Na and low Ali concentrations. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2011
Number of the records: 1