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EUREC4A_M161_Rainwater_Isotopic_Samples_2.0.nc

netcdf EUREC4A_M161_Rainwater_Isotopic_Samples_2.0 {
dimensions:
        level = 1 ;
        onset_time = UNLIMITED ; // (0 currently)
variables:
      	double onset_time(onset_time) ;
                onset_time:units = "seconds since 2020-01-01 00:00:00 UTC" ;
        double onset_lon(onset_time) ;
                onset_lon:long_name = "longitude" ;
                onset_lon:units = "decimal_degrees_east" ;
        double onset_lat(onset_time) ;
                onset_lat:long_name = "onset latitude" ;
                onset_lat:units = "decimal_degrees_north" ;
      	double end_time(onset_time) ;
                end_time:units = "seconds since 2020-01-01 00:00:00 UTC" ;
        double end_lon(onset_time) ;
                end_lon:long_name = "end_longitude" ;
                end_lon:units = "decimal_degrees_east" ;
        double end_lat(onset_time) ;
                end_lat:long_name = "end_latitude" ;
                end_lat:units = "decimal_degrees_north" ;              
        double d18O(onset_time) ;
                d18O:long_name = "Oxygen 18/16 isotope delta value" ;
                d18O:units = "delta_per_mil" ;
        double dD(onset_time) ;
                dD:long_name = "D/H isotope delta value" ;
                dD:units = "delta_per_mil" ;
 
// global attributes:
		:Title = "EUREC4A_M161_Rainwater_Isotopic_Samples_2.0"	;                
                :Author = "Sebastian Los <slos@unm.edu  https://orcid.org/0000-0002-6310-6414"  ;
                :PI = "Dr. Joseph Galewsky <galewsky@unm.edu  https://orcid.org/ 0000-0001-8236-6839"   ;
                :Collector = "Sebastian Los <slos@unm.edu" ;
                :Description = "Delta values per mil on VSMOW-SLAP scale. Captured via Palmex RS1 Sampler. Collected immediately after end of rain event. Bulk uncertainties: d18O = 0.2, dD = 0.51."   ;
                :Experiment = "EUREC4A Field Campaign" ;
                :Platform = "RV Meteor" ;
                :Number_of_Samples = "15" ;                
                :Collected = "Jan 18 - Feb 21, 2020" ;
                :Created = "Aug 23, 2020"	;
                :Updated = "Sep 28, 2021"	;
                :History = "Version 2.0 distinguishes rain onset and rain ending times and locations"	;                
                :Version = "2" ;
                :DOI = "https://doi.org/10.25326/308"   ;
}

Rainwater samples were collected using a Palmex RS1 rain sampler (Gröning et al. 2012), installed in a relatively unshielded location on the aft, starboard railing of the navigation deck at ~17.5 m.a.s.l.. The location was chosen to limit the effects of wind interactions with the ship and so as to avoid obstruction of the area above the sampler by the main mast. The sampler funnel was cleaned regularly. Immediately after rainfall ended, samples were transferred to 2-mL vials, which were filled to minimize headspace, sealed with parafilm, and stored in a refrigerator at ~4ºC during the cruise, at ambient temperatures for shipment, and then again in a refrigerator at ~4ºC prior to lab measurement. Rainfall amount was estimated by sample volume, however, an undercatch of around half was typical compared to the German Weather Service (DWD) rain gauge, designed for ship use, located on the mast, therefore amounts were not recorded. Meteor precipitation samples were processed on a Picarro L-2140-i at the University of New Mexico Center for Stable Isotopes. Bulk uncertainties are estimated as 0.2 and 0.51 for d18O and dD respectively. In total 15 rain samples were collected on the Meteor from 20 January to 19 February, representing 15 separate rain events. DOI: https://doi.org/10.25326/308.