Depth profiles of the isotopic composition (δ30Si) of silicon within dissolved silicic acid from samples collected on Leg 1 of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018

The isotopic composition of dissolved silicon (δ30Si) has proven to be a powerful tool to better understand the marine Si cycle. The δ30Si of seawater carries information about dissolved silicon utilization in surface waters, the subsequent dissolution of sinking biogenic material as well as water mass mixing. This data set supplies information on the spatial distribution of isotopes of Si within water masses from Tahiti to Alaska along GEOTRACES section GP15. This dataset results from leg 1 of the expedition, RR1814; data from RR1815 are available in a separate BCO-DMO dataset.

溶解硅同位素组成（δ³⁰Si）已被证实是深入理解海洋硅循环的有力工具。海水的δ³⁰Si蕴含了表层水体溶解硅利用、沉降生源物质后续溶解以及水团混合过程的相关信息。本数据集提供了沿GEOTRACES GP15断面从塔希提岛至阿拉斯加海域的水团内部硅同位素空间分布数据。该数据集来源于RR1814考察航次的第一航段；RR1815航次的相关数据可在独立的BCO-DMO数据集中获取。