MOdern River archivEs of Particulate Organic Carbon: MOREPOC
Yutian Ke1,2, Damien Calmels1, Julien Bouchez32, Cécile Quantin1
1 GEOPS, Université Paris-Saclay-CNRS, Orsay, 91405, France 
2 Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
2 Université de Paris-Cité, Institut de physique du globe de Paris, CNRS, Paris, 75005, France
Correspondence to: Yutian Ke (yutianke@caltech.edu; yutian.ke@universite-paris-saclay.fr)

Summary of the parameters of the MOREPOC v1.1 database (Parameter, Description, MOREPOC column name)

River name	Name of the major river basin	bas_id
Sub river name	Name of the sampled river/stream	riv_id
Country	Name of country or places	country
Continent	Name of the continent	cont
Sampling site/code	Expedition sampling ID	code
Sampling date	Time (month/day/year) when the SPM sample was collected	time_m/d/y
Latitude	Decimal latitude using WGS 1984	lat
Longitude	Decimal longitude using WGS 1984	lon
Sampling technique	Method of SPM sampling	type_spm
Size fraction of SPM	Reported size fractions analyzed	fra_spm
SPM concentration (mg/L)	The total dry weight of SPM in mg per liter water column	conc_spm
POC concentration (mg/L)	The total dry weight of POC in mg per liter water column	conc_poc
POC content (%)	The total POC content of SPM in wt %	perc_poc
POC content uncertainty (1σ)	The analytical uncertainty for POC content (1σ)	perc_poc_1sd
δ13C (‰)	δ13C values of POC (carbonate removed) in ‰	d13C_poc
δ13C uncertainty (1σ)	The analytical uncertainty for δ13C of POC	d13C_1sd
Δ14C (‰)	Δ14C values of POC (carbonate removed) in ‰	D14C_poc
Δ14C uncertainty (1σ)	The analytical uncertainty for Δ14C of POC	D14C_1sd
Fraction modern (Fm)	Fraction modern of POC	F14C
Radiocarbon ages (year)	Radiocarbon ages before present (1950)	age_14C
TN content (%)	The total nitrogen content of SPM in wt %	perc_tn
Corg/N mass ratio	The mass ratio of POC to TN in SPM	cn_ratio
Al/Si mass ratio	The mass ratio of Al to Si in SPM	alsi_ratio
Reference	Full list of citations of the data source	ref
Complete reference	Complete information for cited references	ref_c
Measured parameters	Summarization of elemental and isotopic carbon parameters measured	para_m
Calculated parameters	Summarization of elemental and isotopic carbon parameters calculated	para_c
Filter	Filter used to obtain SPM	filter
Acid	The acid type used to remove carbonate in SPM	acid
Carbonate removal method	The method used to remove carbonate in SPM	m_acid
Acid concentration	The concentration of adopted acid to remove carbonate in SPM	conc_acid
carbonate removal temperature	The environmental temperature for acid to remove carbonate in SPM	temp_acid
Carbonate removal duration	The reaction time used for acid to remove carbonate in SPM	time_acid
Note	Additional information for carbonate removal process	note

Parameter convertion if applied
conc_poc=conc_spm*perc_poc/100
cn_ratio=perc_poc/perc_tn
age_14C=-8033ln(F14C)
D14C_poc (in ‰)=[F14C*exp ((1950-yr)/8267)-1]*1000
