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TZID:Europe/Berlin
TZUNTIL:20121028T010000Z
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DTSTART:20101031T030000
TZOFFSETFROM:+0200
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RDATE:20111030T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t87175id
DTSTAMP:20260316T204227Z
DESCRIPTION:Eingeladen durch Prof Peiffer. Catchment tracer studies have ty
 pically suffered from a stark mismatch of measurement timescales: water fl
 uxes are typically measured sub-hourly\, but their chemical signatures are
  typically sampled only weekly or monthly. More intensive measurement camp
 aigns usually last only for short periods\, such as individual storm cycle
 s. At the Plynlimon catchment in mid-Wales\, however\, precipitation and s
 treamflow have now been sampled every seven hours for nearly two years\, a
 nd analyzed for water isotopes and more than 40 chemical tracers spanning 
 the periodic table. Here we explore these unique tracer time series\, and 
 compare them to longer-term (~20 years) but less frequently sampled (weekl
 y) hydrochemical data from the same catchment. The high-frequency sampling
  reveals clear diurnal cycles in many chemical species\, including some th
 at are not normally thought to be biologically controlled. Passive tracers
  such as chloride and water isotopes are very strongly damped in streamflo
 w relative to precipitation\, implying that the catchment stores and mixes
  volumes of water that are much larger than individual storms\, on timesca
 les that are much longer than the intervals between events. However\, othe
 r chemical species show strong coupling to streamflow on timescales of hou
 rs\, implying that the catchment can rapidly re-set the chemical signature
  of 'old water' in response to changes in the flow regime. The implication
 s of these observations for catchment flowpaths\, runoff generation\, and 
 biogeochemical processes will be discussed.  
DTSTART;TZID=Europe/Berlin:20110127T161500
DTEND;TZID=Europe/Berlin:20110127T174500
LOCATION:H6
SUMMARY:Prof. Dr. James Kirchner\, Eidgenössische Forschungsanstalt für Wal
 d\, Schnee\, und Landschaft (WSL)\, Birmensdorf\, Schweiz: Hydrological pr
 ocesses revealed by high-frequency chemical dynamics spanning the periodic
  table
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