Dataset contains environmental parameters and concentrations (pmol L-1) and fluxes (nmol m-2 d-1) of non-methane hydrocarbons in the Northwest Pacific Ocean (2017-10 to 2017-12).

Cruise Information:The cruise was conducted onboard the R/V 'Dong Fang Hong 2' from October 6 to December 7, 2017.Sample Collection and Analysis:Seawater samples were collected with Niskin bottles (12-L) installed in a conductivity-temperature-depth (CTD, Seabird 911) rosette. The samples were packed into 120-mL brown-colored glass vials. Two drops of saturated HgCl2 solution were added to each sample to prevent potential microbial activity before the sample storage (Wu et al., 2021). The relevant characteristics of the marine samples were quantified by a gas chromatograph with a mass spectrum detector (GC-MSD) (Agilent 7890A/5975C, USA) equipped with a purge-and-trap (P&T) system in the case of selective ion monitoring (Wu et al., 2021).Calculation of Sea-to-air Fluxes:The equation used herein to calculate the sea-to-air fluxes (F, nmol m-2 d-1) of NMHCs can be expressed as follows: F=k(CW-CaH), where k (m s-1) represents the gas transfer velocity computed by Wanninkhof. (1992), Cw (pmol L-1) and Ca (pptv) are the NMHCs concentrations in the surface seawater and marine atmosphere, respectively, and H represents Henry's Law constant.All stations were at 'integer degree' and the precision is +- 0.05 degree.