Dataset: Gaseous ionic (so-called "reactive") mercury concentration in the atmosphere, measured using cation ion exchange (CEM) membranes on the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814 & RR1815) on R/V Roger Revelle from Sept-Nov 2018

This dataset reports gaseous ionic (so-called "reactive") mercury concentration in the atmosphere, measured using specific filters (cation ion exchange (CEM) membranes).

The sampling system was connected to the sector control device that was used for the collection of high volume aerosol samples so these collections were not made during periods of potential air contamination from the ship. While the sectored sampling system was used, the collection time was different than that of the aerosols, and was typically several days. No GEOTRACES ID's are associated with these samples. Samples were analyzed after the cruise by acid digestion of the filter and analysis using well-established protocols, as detailed in He and Mason (2021). Reported concentrations are average values and their standard deviation for each sampling period. Parameter is named based on the format developed by the GEOTRACES committee as: Hg_G_R_CONC_CEM. In the scientific literature, the measurements are reported with the following acronyms: RGM, RGHg, GOM.

Gaseous reactive mercury measured using CEM is reported in units of picograms per cubic meter (pg/m³).
Detection limit = <1
Spike recovery (%) = 101.2±7.1