Krycklan Data

• pH (dimensionless)
  Measurement of hydrogen ion activity (acidity/alkalinity).

• SCOND – Specific Conductivity (µS cm⁻¹ @ 25 °C)
  Electrical conductivity standardized at 25 °C.

• DOC – Dissolved Organic Carbon (mg C L⁻¹)
  Acidified and purged samples are combusted in a heated oxidation tube. Instrument: Shimadzu TOC-V with TNM-1 module.

• TOT-N – Total Nitrogen (mg L⁻¹)
  Same procedure as DOC; nitrogen is oxidized to NOx. Instrument: Shimadzu TOC-V with TNM-1.

• PO₄-P – Phosphate Phosphorus (µg P L⁻¹)
  Spectrophotometric analysis using AutoAnalyzer AA3 (Omniprocess AB). Detection limit: 0.4 µg P L⁻¹.

• NH₄-N – Ammonium Nitrogen (µg N L⁻¹)
  Spectrophotometric analysis via AutoAnalyzer AA3. Detection limit: 0.3 µg N L⁻¹.

• NO₂/NO₃-N – Nitrite/Nitrate Nitrogen (µg N L⁻¹)
  Spectrophotometric analysis using AutoAnalyzer AA3. Detection limit: 0.4 µg N L⁻¹.

• SO₄-S – Sulfate Sulfur (µg S L⁻¹)
  Ion chromatography with conductivity detection (IC Metrohm, Version 2.3). Detection limit: 0.1 µg S L⁻¹.

• F – Fluorine (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.1 µg L⁻¹.

• Br – Bromine (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.1 µg L⁻¹.

• Cl – Chlorine (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.1 µg L⁻¹.

• Al – Aluminum (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.001 µg L⁻¹.

• B – Boron (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.01 µg L⁻¹.

• Ca – Calcium (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.02 µg L⁻¹.

• Fe – Iron (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.02 µg L⁻¹.

• K – Potassium (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.06 µg L⁻¹.

• Mg – Magnesium (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.001 µg L⁻¹.

• Mn – Manganese (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.001 µg L⁻¹.

• Na – Sodium (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.01 µg L⁻¹.

• P – Phosphorus (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.02 µg L⁻¹.

• S – Sulfur (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.03 µg L⁻¹.

• Si – Silicon (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.02 µg L⁻¹.

• Zn – Zinc (µg L⁻¹)
  ICP-OES (Spectro Ciros Vision). Detection limit: 0.001 µg L⁻¹.

• ABS254nm, ABS365nm, ABS420nm, ABS436nm, ABS440nm – UV Absorbance at Specific Wavelengths (dimensionless)
  Measured with HORIBA Aqualog using 10 mm cuvettes. Filtered samples. Used as proxies for dissolved organic matter character.

• δ¹⁸O – Oxygen-18 in Water (‰ vs. VSMOW)
  Stable isotope ratio of oxygen, expressed relative to Vienna Standard Mean Ocean Water (VSMOW).

• δ²H – Deuterium in Water (‰ vs. VSMOW)
  Stable isotope ratio of hydrogen, expressed relative to VSMOW.

The 68 km2 Krycklan catchment encompasses the natural mosaic of boreal landscapes consisting of forests, mires, streams and lakes that make up 70% of the area in Sweden, and which is representative of 30% of the world’s forest cover. Krycklan is an integral part of the Svartberget field research infrastructure, which belongs to the Swedish University of Agricultural Sciences (SLU). The Svartberget field station is also responsible for Degerö stormyr, Rosinedal, Flakaliden and Norrliden.

• Runoff data is available from 1980- present in the C7 catchment
• Dataset from 2004 is available from following catchment outlets
  • C1
  • C2
  • C4
  • C5
  • C6
  • C7
  • C9
  • C10
  • C12
  • C13
  • C14
  • C15
  • C16
  • C20

A number of groundwater wells provide water levels and chemistry data that is available upon request