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Schmid, Simone; Burkard, Reto; Frumau, K F A; Tobón, C; Bruijnzeel, L Adrian; Siegwolf, Rolf T E; Eugster, Werner (2011): Isotopic composition of water in fog, rain, throughfall and stemflow in the Monte Verde, Costa Rica. PANGAEA,, Supplement to: Schmid, S et al. (2011): Using eddy covariance and stable isotope mass balance techniques to estimate fog water contributions to a Costa Rican cloud forest during the dry season. Hydrological Processes, 25, 429-437,

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Fog deposition, precipitation, throughfall and stemflow were measured in a windward tropical montane cloud forest near Monteverde, Costa Rica, for a 65-day period during the dry season of 2003. Net fog deposition was measured directly using the eddy covariance (EC) method and it amounted to 1.2 ± 0.1 mm/day (mean ± standard error). Fog water deposition was 5–9% of incident rainfall for the entire period, which is at the low end of previously reported values. Stable isotope concentrations (d18O and d2H) were determined in a large number of samples of each water component. Mass balance-based estimates of fog deposition were 1.0 ± 0.3 and 5.0 ± 2.7 mm/day (mean ± SE) when d18O and d2H were used as tracer, respectively. Comparisons between direct fog deposition measurements and the results of the mass balance model using d18O as a tracer indicated that the latter might be a good tool to estimate fog deposition in the absence of direct measurement under many (but not all) conditions. At 506 mm, measured water inputs over the 65 days (fog plus rain) fell short by 46 mm compared to the canopy output of 552 mm (throughfall, stemflow and interception evaporation). This discrepancy is attributed to the underestimation of rainfall during conditions of high wind.
Related to:
Burkard, Reto; Schmid, Simone; Eugster, Werner (2003): The role of cloud and fog water inputs in the hydrolocial budget of a tropical cloud forest ecosystem in Costa Rica. Final report of Swiss National Science Foundation Project 2100-068051.02, Institute of Geography, University of Bern, 23 pp, hdl:10013/epic.34719.d001
Schmid, Simone (2004): Water and ion fluxes to a tropical montane cloud forest ecosystem in Costa Rica. Diploma Thesis, University of Bern, Institute of Geography, 91 pp, hdl:10013/epic.34606.d001
Latitude: 10.359200 * Longitude: -84.801400
Date/Time Start: 2003-02-20T17:30:00 * Date/Time End: 2003-05-21T15:30:00
Monte_Verde * Latitude: 10.359200 * Longitude: -84.801400 * Location: Monte Verde, Costa Rica * Method/Device: Monitoring station (MONS)
Swiss National Science Foundation project 2100-068051.02
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
2Date/time endDate/time endEugster, Wernerlocal time
3DurationDurationhEugster, Wernerof sampling period
4ThroughfallTFl/m2Eugster, WernerRain gauge60 roving gauges with an orifice of 100 cm^2 each
5ConductivityCondµSEugster, Werner
6pHpHEugster, WernerElectrode
7δ Deuterium, waterδD H2O‰ SMOWSiegwolf, Rolf T EIsotope ratio mass spectrometryPaul Scherrer Institute, Villigen
8δ18O, waterδ18O H2O‰ SMOWSiegwolf, Rolf T EIsotope ratio mass spectrometryPaul Scherrer Institute, Villigen
9Sample typeSamp typeEugster, Werner
3600 data points

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