10.1594/PANGAEA.989247Hung, Chin-ChangChin-ChangHung0000-0003-0870-8305Department of Oceanography, National Sun Yat-sen UniversityLee, Tse MinTse MinLeeDepartment of Marine Biotechnology and Resources, National Sun Yat-sen UniversityShih, Yung-YenYung-YenShihDepartment of Applied Science, Republic of China Naval AcademyHsieh, Hsueh-HanHsueh-HanHsieh0000-0002-8421-8941Department of Oceanography, National Sun Yat-sen UniversityWu, Syun HanSyun HanWuDepartment of Oceanography, National Sun Yat-sen UniversityAbedneko, Vicente GVicente GAbednekoDepartment of Oceanography, National Sun Yat-sen UniversityChow, Chun HoeChun HoeChowDepartment of Marine Environmental Informatics, National Taiwan Ocean UniversityChung, Tzu ChiehTzu ChiehChungDepartment of Oceanography, National Sun Yat-sen UniversityLiao, Chin HsinChin HsinLiaoDepartment of Marine Biotechnology and Resources, National Sun Yat-sen UniversityZhang, JingjingJingjingZhang0000-0001-8809-3405Second Institute of Oceanography, State Oceanic AdministrationChen, JianfangJianfangChenSecond Institute of Oceanography, State Oceanic AdministrationGuo, LaodongLaodongGuo0000-0002-5010-1630University of Wisconsin–MilwaukeeBacosa, Hernando PHernando PBacosaMindanao State University – Iligan Institute of TechnologyPANGAEA2026Chl-aCTD profiled13CPOC fluxwestern North PacificCampaignEvent labelStation labelSample code/labelDate/time startDate/time endLATITUDELONGITUDEDEPTH, waterSalinityTemperature, waterChlorophyll aCarbon, organic, particulateCarbon, organic, particulate, fluxδ13CCTD, Sea-Bird, SBE 9; measured with Fluorometer, WETStarElemental analyzer, Vario EL CubeContinuous-flow isotope-ratio mass spectrometry (CF-IRMS), MAT253, Thermo Finnigan; coupled with an elemental analyzer, EA 1108, Carlo Erba; via a Conflo III interface, Thermo FinniganLGD_2309LGD_2310Legend2023-07-08T00:00:00/2023-07-26T00:00:00Dataset36242 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalHere we present conductivity–temperature–depth (CTD) data, chlorophyll-a (Chl-a) profiles, particulate organic carbon (POC) fluxes, and stable carbon isotope (δ¹³C) compositions from five stations (P1–P5) in the low-latitude western North Pacific (6–13°N, 131.98–134.99°E). Data were collected during July–August 2023 aboard R/V Legend. The CTD system was a Sea-Bird Electronics SBE 9 equipped with a WETStar fluorometer. POC concentrations were determined using a Vario EL Cube elemental analyzer. POC fluxes were calculated from samples collected by floating sediment traps. Stable carbon isotope (δ¹³C) compositions of POC in floating-trap samples were analyzed with a continuous-flow isotope-ratio mass spectrometer (MAT253, Thermo Finnigan, San Jose, CA, USA) coupled to an elemental analyzer (EA1108, Carlo Erba Instruments) via a Conflo III interface (Thermo Finnigan, San Jose, CA, USA).131.98134.996.0113.0National Science and Technology Council, Taiwanhttps://doi.org/10.13039/501100004663NSTC 111-2119-M-019-002National Science and Technology Council, Taiwanhttps://doi.org/10.13039/501100004663NSTC 112-2119-M-019-008National Science and Technology Council, Taiwanhttps://doi.org/10.13039/501100004663NSTC 113-2119-M-019-008National Science and Technology Council, Taiwanhttps://doi.org/10.13039/501100004663NSTC 114-2119-M-019-002