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, https://doi.org/10.1594/PANGAEA.735614, 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, https://doi.org/10.1002/hyp.7739
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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.
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
Swiss National Science Foundation project 2100-068051.02
|#||Name||Short Name||Unit||Principal Investigator||Method||Comment|
|2||Date/time end||Date/time end||Eugster, Werner||local time|
|3||Duration||Duration||h||Eugster, Werner||of sampling period|
|4||Throughfall||TF||l/m2||Eugster, Werner||Rain gauge||60 roving gauges with an orifice of 100 cm^2 each|
|7||delta Deuterium, water||dD H2O||per mil SMOW||Siegwolf, Rolf T E||Isotope ratio mass spectrometry||Paul Scherrer Institute, Villigen|
|8||delta 18O, water||d18O H2O||per mil SMOW||Siegwolf, Rolf T E||Isotope ratio mass spectrometry||Paul Scherrer Institute, Villigen|
|9||Sample type||Samp type||Eugster, Werner|
3600 data points