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TZUNTIL:20221030T010000Z
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DTSTART:20201025T030000
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UID:www.hydro.uni-bayreuth.de-bayceer-t159070id
DTSTAMP:20260813T060227Z
DESCRIPTION:Dissolved organic carbon (DOC) constitutes the biggest portion 
 of carbon that is exported from soils. During the last decades\, widesprea
 d increases in DOC concentrations of surface waters have been observed\, a
 ffecting ecosystem functioning and drinking water treatment. However\, hyd
 rological controls of DOC mobilization and source areas within catchments 
 are still poorly understood.\nFrom May to October 2020\, we sampled two di
 fferent topographical positions within a Bavarian Forest headwater catchme
 nt\, one in its flat downstream part (770 m.a.s.l.) and one in its steep u
 pstream part (880 m.a.s.l.)\, using piezometers\, pore water samplers (pee
 pers) and in-stream spectrometric devices. We analyzed the concentrations 
 of DOC and several ions as well as DOC absorbance (A254/A365 and SUVA254) 
 and fluorescence characteristics (fluorescence and freshness indices) of s
 oil water\, shallow groundwater and stream water to better understand the 
 DOC source areas during baseflow and during precipitation events. In addit
 ion to snapshot sampling data in an interval of three weeks\, continuous s
 tream DOC data were collected.\nHigh DOC concentrations (up to 80 mg/l) we
 re found in soil water from cascading sequences of small ponds in the flat
  downstream part of the catchment that fill up temporarily. Increasing str
 eam DOC concentrations during events were accompanied by changing DOC char
 acteristics at both locations\, pointing to a change of flow pathways duri
 ng events. In the flat downstream sampling location\, stream DOC freshness
  values and SUVA254 as well as aluminium and nitrate concentrations were a
 pproaching the values found in the DOC-rich small ponds\, suggesting these
  ponds as important DOC sources during precipitation events.
DTSTART;TZID=Europe/Berlin:20210215T090000
DTEND;TZID=Europe/Berlin:20210215T100000
LOCATION:Zoom
SUMMARY:Phil Garthen: Elucidating sources and pathways of dissolved organic
  carbon in a Bavarian Forest headwater catchment - A qualitative assessmen
 t of stream\, soil and shallow groundwater
TRANSP:TRANSPARENT
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