title: Field intercomparison of precipitation measurements performed within the framework of the Pan European Intensive Monitoring Program of EU/ICP Forest.
abstract: A 6-month field intercomparison study on precipitation measurements was performed at Schagerbrug near the west coast in the Netherlands. Twenty bulk sampling systems and two wet-only samplers were evaluated on accuracy, sampling strategy and performance under field conditions. Bulk precipitation fluxes of NO3-, NH4+, H+ and Kjeldahl-N generally could be determined with a greater accuracy than bulk precipitation fluxes of SO4(2-), Na+, Cl-, Mg2+, Ca2+, Alkalinity and H+. Bulk precipitation fluxes of K+ generally had the lowest accuracy. Only 20% of the sampling systems differed less than 10% from the best estimate, whereas most systems (60%) differed more than 20% from the best estimate. The inaccuracy induced by the sampling system appeared to be much larger than that resulting from the analysis of the samples by different laboratories as determined by ring-tests.
authors.affiliation: ECN, PO Box 1, 1755 ZG, The, Petten, Netherlands. erisman@ecn.nl
authors.forename: Jan Willem
authors.initials: JW
authors.lastname: Erisman
authors.forename: Han
authors.initials: H
authors.lastname: Möls
authors.forename: Peter
authors.initials: P
authors.lastname: Fonteijn
authors.forename: Marco
authors.initials: M
authors.lastname: Geusebroek
authors.forename: Geert
authors.initials: G
authors.lastname: Draaijers
authors.forename: Albert
authors.initials: A
authors.lastname: Bleeker
authors.forename: Dennis
authors.initials: D
authors.lastname: van der Veen
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D011232:Chemical Precipitation; D002980:Climate; D017753:Ecosystem; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods* / Q000592:standards; D009426:Netherlands; D015203:Reproducibility of Results; D014197:Trees
chemical_list: D000393:Air Pollutants