Dataset: GT10-11 - Unfiltered Rainwater

Name: Trace metal and major anion concentrations in unfiltered rainwater from R/V Knorr cruises KN199-04 and KN204-01 (GA03) in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project)
Published: 2014-09-16
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.3858.2

Spatial Extent: N:38.75 E:-21 S:23.5 W:-69.97

Temporal Extent: 2010-10-21 - 2011-12-03

Project:

U.S. GEOTRACES North Atlantic Transect (GA03) (U.S. GEOTRACES NAT)

Program:

U.S. GEOTRACES (U.S. GEOTRACES)

Principal Investigator:

William M. Landing (Florida State University, FSU - EOAS)

Contact:

Rachel Shelley (Florida State University, FSU - EOAS)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2014-09-16

Restricted:

Validated:

Yes

Current State:

Final with updates expected

Trace metal and major anion concentrations in unfiltered rainwater from R/V Knorr cruises KN199-04 and KN204-01 (GA03) in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project)

Abstract:

This dataset includes trace metal and major anion concentrations in unfiltered rainwater from R/V Knorr cruises KN199-04 and KN204-01 (GEOTRACES GA03) in the Subtropical northern Atlantic Ocean from 2010-2011.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2014-09-16	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.3858.2	2022-05-16

Description

Trace metals (Li, Na, Mg, Al, P, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, As, Se, Rb, Sr, Zr, Cd, Sn, Sb, Cs, Ba, La, Nd, Pb, Th, U) and major seawater anions (Cl, NO3, SO4) in unfiltered rainwater from the 2010 and 2011 U.S. GEOTRACES North Atlantic Transect cruises.

Methods & Sampling

Rain samples were collected in acid-washed 1 L LDPE bottles fitted with a funnel (diameter 27.94 square centimeters) positioned in a 25 L bucket deployed on an N-CON precipitation sampler (model 00-120-2) attached to the forward railings of the ship’s flying bridge (14 m above sea level) as high off the water as possible to minimize contamination. As soon as a rain event had ended the samples were collected. Approximately half the sample was filtered (0.45 µm GN-6 Metricel filters; cellulose esters) using a polysulfone vacuum filter assembly (Nalgene); the other half remained unfiltered. Both filtered and unfiltered samples were acidified to 0.024 M with ultra-high purity HCl, decanted into polypropylene bottles and double-bagged for storage. Before acidification, an aliquot was taken from the unfiltered sample and frozen for storage and determination of major seawater anions by ion chromatography (Dionex 4500i) in the home laboratory. For determinations of trace metals, rainwater samples were analysed by ICP-MS (Agilent 7500CS and Thermo Element 2) at the National High Magnetic Field Laboratory at Florida State University (FSU). All sample handling was performed under a Class 100 laminar flow hood.

Trace metal concentrations in the reagent blank (0.024 M HCl) were subtracted from all rainwater samples. Filtration blanks were prepared by passing 100 mL of deionized water through GN-6 filters positioned in the filter assembly and subtracted from filtered rainwater samples. Filter blanks averaged 0.034 ± 0.01 µg/L dissolved Fe (representing an average of 1.2% of the Fe sample concentrations). Relative standard deviations of replicate analyses averaged 10% for Fe in rainwater.

Data Processing Description

Concentrations below the detection limit are represented as 'below_DL' (originally "<_DL"). See the Supplemental Files section for Detection Limits.

Quality flag definitions:
BDL = below detection limit (detection limit = 3 standard deviations of the blank).
0 = No QC performed.
1 = Good data.
2 = Probably good data.
3 = Probably bad data that is potentially correctable.
4 = Bad data.
5 = Value changed.
6 = Sample < blank.
7 = Outlier (unexplained data point or sample).
8 = Interpolated value.
9 = Missing value.
F = Filtered sample.

BCO-DMO made the following modifications:
- Replaced blanks with 'nd'.
- Replaced ' < DL' with 'below_DL'.
- Changed PI-supplied cruise IDs of KN204-4 and KN204-5 to KN204-01A and KN204-01B. Added 'cruise_part' column to distingush between parts A and B of cruise KN204-01.
- Copied averages and variances from the 3rd sub_sample to the all 3 sub_sample rows (where applicable).

Additional GEOTRACES Processing:
After the data were submitted to the International Data Management Office, BODC, the office noticed that important identifying information was missing in many datasets. With the agreement of BODC and the US GEOTRACES lead PIs, BCO-DMO added standard US GEOTRACES information, such as the US GEOTRACES event number, to each submitted dataset lacking this information. To accomplish this, BCO-DMO compiled a 'master' dataset composed of the following parameters: station_GEOTRC, cast_GEOTRC (bottle and pump data only), event_GEOTRC, sample_GEOTRC, sample_bottle_GEOTRC (bottle data only), bottle_GEOTRC (bottle data only), depth_GEOTRC_CTD (bottle data only), depth_GEOTRC_CTD_rounded (bottle data only), BTL_ISO_DateTime_UTC (bottle data only), and GeoFish_id (GeoFish data only). This added information will facilitate subsequent analysis and inter comparison of the datasets.

Bottle parameters in the master file were taken from the GT-C_Bottle_GT10, GT-C_Bottle_GT11, ODF_Bottle_GT10, and ODF_Bottle_GT11 datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the Event_Log_GT10 and Event_Log_GT11 datasets. McLane pump cast numbers missing in event logs were taken from the Particulate Th-234 dataset submitted by Ken Buesseler.

A standardized BCO-DMO method (called "join") was then used to merge the missing parameters to each US GEOTRACES dataset, most often by matching on sample_GEOTRC or on some unique combination of other parameters.

If the master parameters were included in the original data file and the values did not differ from the master file, the original data columns were retained and the names of the parameters were changed from the PI-submitted names to the standardized master names. If there were differences between the PI-supplied parameter values and those in the master file, both columns were retained. If the original data submission included all of the master parameters, no additional columns were added, but parameter names were modified to match the naming conventions of the master file.

See the dataset parameters documentation for a description of which parameters were supplied by the PI and which were added via the join method.

Data Files

File
Unfiltered_Rain_GT10-11_joined.csv (Comma Separated Values (.csv), 10.73 KB) MD5:b0f2dfd90236c6f27f9d53b8eb3e59a7 Primary data file for dataset ID 3858

Supplemental Files

File
3858_Unfiltered_Rainwater_Detection_Limits.pdf (Portable Document Format (.pdf), 540.75 KB) MD5:1c11a07ed03634a82eb4d125b882b54c Detection Limits for dataset 3858 - GT10-11 - Unfiltered Rainwater (PI: William Landing)

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-0752351
NSF Division of Ocean Sciences	OCE-0929919
NSF Division of Ocean Sciences	OCE-1132766

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
KN204-01	GA03 GT11 KN204-01A KN204-01B USGT-NAT-2011 USGNAZT GNAT 316N20111106 KN204-1	2011-11-06	R/V Knorr	Edward A. Boyle (Chief Scientist) Gregory A. Cutter (Co-Chief Scientist)	data info
KN199-04	GA03 GT10 USGT-NAT-2010 KN199-4 GNAT U.S. GEOTRACES NAZT Leg 1 knorr199-4/5 Section Cruise (GA03) 316N20101015	2010-10-15	R/V Knorr	William J. Jenkins (Chief Scientist) Edward A. Boyle (Co-Chief Scientist) Gregory A. Cutter (Co-Chief Scientist)	data info

Instruments

Inductively Coupled Plasma Mass Spectrometer

Supplied Description:

For determinations of trace metals, rainwater samples were analysed by ICP-MS (Agilent 7500CS and Thermo Element 2) at the National High Magnetic Field Laboratory at Florida State University (FSU).

Instrument Type

Generic Name: Inductively Coupled Plasma Mass Spectrometer

Acronym: ICP Mass Spec

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB15/

Generic Description:

An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer.

Ion Chromatograph

Supplied Description:

Major anions were determined by ion chromatography (Dionex 4500i).

Instrument Type

Generic Name: Ion Chromatograph

Generic Description:

Ion chromatography is a form of liquid chromatography that measures concentrations of ionic species by separating them based on their interaction with a resin. Ionic species separate differently depending on species type and size. Ion chromatographs are able to measure concentrations of major anions, such as fluoride, chloride, nitrate, nitrite, and sulfate, as well as major cations such as lithium, sodium, ammonium, potassium, calcium, and magnesium in the parts-per-billion (ppb) range. (from http://serc.carleton.edu/microbelife/research_methods/biogeochemical/ic.html)

Precipitation Sampler

Supplied Description:

Rain samples were collected using an N-CON precipitation sampler (model 00-120-2). See the product information sheet.

Instrument Type

Generic Name: Precipitation Sampler

Acronym: Precip_Sampler

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/14/

Generic Description:

A device that collects a sample of precipitation (rain, hail or snow) as it falls.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	Official cruise identifier e.g. KN199-04 = R/V Knorr cruise number 199-04.	text	cruise_id
cruise_part	Part of cruise. For KN204-01: A = 11/6/2011 to 11/18/2011 (Woods Hole to Bermuda) B = 11/19/2011 to 12/11/2011 (Bermuda to Praia, Cabo Verde)	text	cruise_part
sample_GEOTRC	Unique identifying number for US GEOTRACES samples; ranges from 5033 to 6078 for KN199-04 and from 6112 to 8148 for KN204-01. PI-supplied values were identical to those in the intermediate US GEOTRACES master file. Originally submitted as 'Sample #', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.	unitless	sample
sub_sample	Sub-sample number.	unitless	sample
julian_day	Julian day at start of sampling event.		julian_day
day_start	2-digit day of month at start of sampling event.	dd (01 to 31)	day_start
month_start	2-digit month of year at start of sampling event.	mm (01 to 12)	month_start
year_start	4-digit year at start of sampling event.	YYYY	year_start
time_start_utc	Time (UTC) at start of sampling event. 24-hour clock.	HHMM	time_start
lat_start	Latitude at start of sampling event. North = Positive.	decimal degrees	lat_start
lon_start	Longitude at start of sampling event. West = Negative.	decimal degrees	lon_start
day_end	2-digit day of month at end of sampling event.	dd (01 to 31)	day_end
month_end	2-digit month of year at end of sampling event.	mm (01 to 12)	month_end
year_end	4-digit year at end of sampling event.	YYYY	year_end
time_end_utc	Time (UTC) at end of sampling event. 24-hour clock.	HHMM	time_end
lat_end	Latitude at end of sampling event. North = Positive.	decimal degrees	lat_end
lon_end	Longitude at end of sampling event. West = Negative.	decimal degrees	lon_end
rain_depth	Rain depth (mm; based on funnel diameter of 279.4 mm).	millimeters	no_bcodmo_term
Li	Unfiltered rainwater Li (Lithium) concentration.	ug/L	precip_chemistry
Li_avg	Unfiltered rainwater Li concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Li_var	Unfiltered rainwater Li concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Li_flag	Unfiltered rainwater Li concentration data quality flag.	unitless	q_flag
Na	Unfiltered rainwater Na (Sodium) concentration.	ug/L	precip_chemistry
Na_avg	Unfiltered rainwater Na concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Na_var	Unfiltered rainwater Na concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Na_flag	Unfiltered rainwater Na concentration data quality flag.	unitless	q_flag
Mg	Unfiltered rainwater Mg (Magnesium) concentration.	ug/L	precip_chemistry
Mg_avg	Unfiltered rainwater Mg concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Mg_var	Unfiltered rainwater Mg concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Mg_flag	Unfiltered rainwater Mg concentration data quality flag.	unitless	q_flag
Al	Unfiltered rainwater Al (Aluminum) concentration.	ug/L	precip_chemistry
Al_avg	Unfiltered rainwater Al concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Al_var	Unfiltered rainwater Al concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Al_flag	Unfiltered rainwater Al concentration data quality flag.	unitless	q_flag
P	Unfiltered rainwater P (Phosphorus) concentration.	ug/L	precip_chemistry
P_avg	Unfiltered rainwater P concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
P_var	Unfiltered rainwater P concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
P_flag	Unfiltered rainwater P concentration data quality flag.	unitless	q_flag
Ti	Unfiltered rainwater Ti (Titanium) concentration.	ug/L	precip_chemistry
Ti_avg	Unfiltered rainwater Ti concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Ti_var	Unfiltered rainwater Ti concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Ti_flag	Unfiltered rainwater Ti concentration data quality flag.	unitless	q_flag
V	Unfiltered rainwater V (Vanadium) concentration.	ug/L	precip_chemistry
V_avg	Unfiltered rainwater V concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
V_var	Unfiltered rainwater V concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
V_flag	Unfiltered rainwater V concentration data quality flag.	unitless	q_flag
Cr	Unfiltered rainwater Cr (Chromium) concentration.	ug/L	precip_chemistry
Cr_avg	Unfiltered rainwater Cr concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Cr_var	Unfiltered rainwater Cr concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Cr_flag	Unfiltered rainwater Cr concentration data quality flag.	unitless	q_flag
Mn	Unfiltered rainwater Mn (Manganese) concentration.	ug/L	precip_chemistry
Mn_avg	Unfiltered rainwater Mn concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Mn_var	Unfiltered rainwater Mn concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Mn_flag	Unfiltered rainwater Mn concentration data quality flag.	unitless	no_bcodmo_term
Fe	Unfiltered rainwater Fe (Iron) concentration.	ug/L	precip_chemistry
Fe_avg	Unfiltered rainwater Fe concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Fe_var	Unfiltered rainwater Fe concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Fe_flag	Unfiltered rainwater Fe concentration data quality flag.	unitless	no_bcodmo_term
Co	Unfiltered rainwater Co (Cobalt) concentration.	ug/L	precip_chemistry
Co_avg	Unfiltered rainwater Co concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Co_var	Unfiltered rainwater Co concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Co_flag	Unfiltered rainwater Co concentration data quality flag.	unitless	no_bcodmo_term
Ni	Unfiltered rainwater Ni (Nickel) concentration.	ug/L	precip_chemistry
Ni_avg	Unfiltered rainwater Ni concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Ni_var	Unfiltered rainwater Ni concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Ni_flag	Unfiltered rainwater Ni concentration data quality flag.	unitless	no_bcodmo_term
Cu	Unfiltered rainwater Cu (Copper) concentration.	ug/L	precip_chemistry
Cu_avg	Unfiltered rainwater Cu concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Cu_var	Unfiltered rainwater Cu concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Cu_flag	Unfiltered rainwater Cu concentration data quality flag.	unitless	no_bcodmo_term
Zn	Unfiltered rainwater Zn (Zinc) concentration.	ug/L	precip_chemistry
Zn_avg	Unfiltered rainwater Zn concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Zn_var	Unfiltered rainwater Zn concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Zn_flag	Unfiltered rainwater Zn concentration data quality flag.	unitless	no_bcodmo_term
As	Unfiltered rainwater As (Arsenic) concentration.	ug/L	precip_chemistry
As_avg	Unfiltered rainwater As concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
As_var	Unfiltered rainwater As concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
As_flag	Unfiltered rainwater As concentration data quality flag.	unitless	no_bcodmo_term
Se	Unfiltered rainwater Se (Selenium) concentration.	ug/L	precip_chemistry
Se_avg	Unfiltered rainwater Se concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Se_var	Unfiltered rainwater Se concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Se_flag	Unfiltered rainwater Se concentration data quality flag.	unitless	q_flag
Rb	Unfiltered rainwater Rb (Rubidium) concentration.	ug/L	precip_chemistry
Rb_avg	Unfiltered rainwater Rb concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Rb_var	Unfiltered rainwater Rb concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Rb_flag	Unfiltered rainwater Rb concentration data quality flag.	unitless	no_bcodmo_term
Sr	Unfiltered rainwater Sr (Strontium) concentration.	ug/L	precip_chemistry
Sr_avg	Unfiltered rainwater Sr concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Sr_var	Unfiltered rainwater Sr concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Sr_flag	Unfiltered rainwater Sr concentration data quality flag.	unitless	no_bcodmo_term
Zr	Unfiltered rainwater Zr (Zirconium) concentration.	ug/L	precip_chemistry
Zr_avg	Unfiltered rainwater Zr concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Zr_var	Unfiltered rainwater Zr concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Zr_flag	Unfiltered rainwater Zr concentration data quality flag.	unitless	no_bcodmo_term
Cd	Unfiltered rainwater Cd (Cadmium) concentration.	ug/L	precip_chemistry
Cd_avg	Unfiltered rainwater Cd concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Cd_var	Unfiltered rainwater Cd concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Cd_flag	Unfiltered rainwater Cd concentration data quality flag.	unitless	no_bcodmo_term
Sn	Unfiltered rainwater Sn (Tin) concentration.	ug/L	precip_chemistry
Sn_avg	Unfiltered rainwater Sn concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Sn_var	Unfiltered rainwater Sn concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Sn_flag	Unfiltered rainwater Sn concentration data quality flag.	unitless	no_bcodmo_term
Sb	Unfiltered rainwater Sb (Antimony) concentration.	ug/L	precip_chemistry
Sb_avg	Unfiltered rainwater Sb concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Sb_var	Unfiltered rainwater Sb concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Sb_flag	Unfiltered rainwater Sb concentration data quality flag.	unitless	no_bcodmo_term
Cs	Unfiltered rainwater Cs (Caesium) concentration.	ug/L	precip_chemistry
Cs_avg	Unfiltered rainwater Cs concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Cs_var	Unfiltered rainwater Cs concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Cs_flag	Unfiltered rainwater Cs concentration data quality flag.	unitless	no_bcodmo_term
Ba	Unfiltered rainwater Ba (Barium) concentration.	ug/L	precip_chemistry
Ba_avg	Unfiltered rainwater Ba concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Ba_var	Unfiltered rainwater Ba concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Ba_flag	Unfiltered rainwater Ba concentration data quality flag.	unitless	no_bcodmo_term
La	Unfiltered rainwater La (Lanthanum) concentration.	ug/L	precip_chemistry
La_avg	Unfiltered rainwater La concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
La_var	Unfiltered rainwater La concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
La_flag	Unfiltered rainwater La concentration data quality flag.	unitless	no_bcodmo_term
Ce	Unfiltered rainwater Ce (Cerium) concentration.	ug/L	precip_chemistry
Ce_avg	Unfiltered rainwater Ce concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Ce_var	Unfiltered rainwater Ce concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Ce_flag	Unfiltered rainwater Ce concentration data quality flag.	unitless	no_bcodmo_term
Nd	Unfiltered rainwater Nd (Neodymium) concentration.	ug/L	precip_chemistry
Nd_avg	Unfiltered rainwater Nd concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Nd_var	Unfiltered rainwater Nd concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Nd_flag	Unfiltered rainwater Nd concentration data quality flag.	unitless	no_bcodmo_term
Pb	Unfiltered rainwater Pb (Lead) concentration.	ug/L	precip_chemistry
Pb_avg	Unfiltered rainwater Pb concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Pb_var	Unfiltered rainwater Pb concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Pb_flag	Unfiltered rainwater Pb concentration data quality flag.	unitless	no_bcodmo_term
Th	Unfiltered rainwater Th (Thorium) concentration.	ug/L	precip_chemistry
Th_avg	Unfiltered rainwater Th concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
Th_var	Unfiltered rainwater Th concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
Th_flag	Unfiltered rainwater Th concentration data quality flag.	unitless	no_bcodmo_term
U	Unfiltered rainwater U (Uranium) concentration.	ug/L	precip_chemistry
U_avg	Unfiltered rainwater U concentration average of sub_samples within a sample.	ug/L	no_bcodmo_term
U_var	Unfiltered rainwater U concentration variance of sub_samples within a sample.	ug/L	no_bcodmo_term
U_flag	Unfiltered rainwater U concentration data quality flag.	unitless	no_bcodmo_term
Cl	Unfiltered rainwater Cl (Chlorine) concentration.	mg/L	precip_chemistry
Cl_avg	Unfiltered rainwater Cl concentration average of sub_samples within a sample.	mg/L	no_bcodmo_term
Cl_var	Unfiltered rainwater Cl concentration variance of sub_samples within a sample.	mg/L	no_bcodmo_term
Cl_flag	Unfiltered rainwater Cl concentration data quality flag.	unitless	q_flag
NO3	Unfiltered rainwater NO3 (Nitrate) concentration.	mg/L	precip_chemistry
NO3_avg	Unfiltered rainwater NO3 concentration average of sub_samples within a sample.	mg/L	no_bcodmo_term
NO3_var	Unfiltered rainwater NO3 concentration variance of sub_samples within a sample.	mg/L	no_bcodmo_term
NO3_flag	Unfiltered rainwater NO3 concentration data quality flag.	unitless	no_bcodmo_term
nss_SO4	Unfiltered rainwater nssSO4 (non-sea salt SO4) concentration.	mg/L	precip_chemistry
nss_SO4_avg	Unfiltered rainwater nssSO4 (non-sea salt SO4) concentration average of sub_samples within a sample.	mg/L	no_bcodmo_term
nss_SO4_var	Unfiltered rainwater nssSO4 (non-sea salt SO4) concentration variance of sub_samples within a sample.	mg/L	no_bcodmo_term
nss_SO4_flag	Unfiltered rainwater nssSO4 (non-sea salt SO4) concentration data quality flag.	unitless	q_flag
station_GEOTRC	GEOTRACES station number; ranges from 1 through 12 for KN199-04 and 1 through 24 for KN204-01. Stations 7 and 9 were skipped on KN204-01. Some GeoFish stations are denoted as X_to_Y indicating the tow occurred between stations X and Y. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	unitless	station
event_GEOTRC	Unique identifying number for US GEOTRACES sampling events; ranges from 2001 to 2225 for KN199-04 events and from 3001 to 3282 for KN204-01 events. Values were added from the intermediate US GEOTRACES master file (see Processing Description).	unitless	event
ISO_DateTime_UTC_start	Date and time (UTC) variable recorded at the start of sampling time in ISO compliant format. Values were added from the intermediate US GEOTRACES master file (see Processing Description). This standard is based on ISO 8601:2004(E) and takes on the following form: 2009-08-30T14:05:00[.xx]Z (UTC time)	YYYY-MM-DDTHH:MM:SS[.xx][+/-TZ]	ISO_DateTime_UTC
ISO_DateTime_UTC_end	Date and time (UTC) variable recorded at the end of sampling time in ISO compliant format. Values were added from the intermediate US GEOTRACES master file (see Processing Description). This standard is based on ISO 8601:2004(E) and takes on the following form: 2009-08-30T14:05:00[.xx]Z (UTC time)	YYYY-MM-DDTHH:MM:SS[.xx][+/-TZ]	ISO_DateTime_UTC

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Dataset: GT10-11 - Unfiltered Rainwater