Suspended Organic Particle concentration and stable C and N isotopes (collected with McClane Pumps and GF/F filters) from the Eastern Tropical North Pacific on the R/V Thompson cruise TN278 in April 2012

Suspended organic carbon and nitrogen concentrations and stable isotopes were obtained on the R/V Thompson cruise TN278 at St P2 (16.5 N 107.1 W; known as BB2 on this cruise) and at St P1 (20.1 N 106.0 W; known as BB1 on this cruise) in the Eastern Tropical North Pacific Oxygen Deficient Zone in April 2012. The Oxygen Deficient Zone extended from 105 m to 820 m at St P2 and from 95 to 800 m at St P1. Water was filtered onto 142 mm pre-combusted GF/F filters in situ using McClane pumps (on average ~300-500 L) in a depth profile. Two 21 mm diameter punches were obtained from each 142 mm filter and used for organic matter analysis. Sample punches were wafted with HCl overnight to remove carbonate and sent to the UC Davis Stable Isotope Facility (Davis, CA) for C and N analysis. The purpose of this sampling was to quantify suspended organic matter in an offshore Oxygen Deficient Zone. Jacquelyn Neibauer and Rick Keil of the University of Washington deployed the McClane pumps on the cruise. Jacquelyn Neibauer was in charge of prepping the samples. Megan Duffy and Clara Fuchsman of the University of Washington analyzed the data.2012年4月，于东热带北太平洋缺氧区（Oxygen Deficient Zone）开展汤普森号（R/V Thompson）TN278航次的采样工作，在站位P2（16.5°N，107.1°W，本次航次编号为BB2）与站位P1（20.1°N，106.0°W，本次航次编号为BB1）采集了悬浮有机碳、氮浓度及稳定同位素数据。站位P2处缺氧区延伸深度为105 m至820 m，站位P1处为95 m至800 m。 采样过程中，采用McClane泵（McClane pumps）原位过滤海水，将悬浮颗粒物截留在142 mm预燃烧GF/F滤膜（GF/F filters）上，单站位剖面采样平均过滤海水体积约300~500 L。从每张142 mm滤膜上切取2片直径21 mm的滤膜圆片，用于有机质分析。将滤膜圆片用HCl熏蒸过夜以去除碳酸盐，随后送至加州大学戴维斯分校稳定同位素实验室（UC Davis Stable Isotope Facility，加利福尼亚州戴维斯市）开展碳、氮元素分析。 本次采样旨在量化离岸缺氧区内的悬浮有机质含量。 华盛顿大学（University of Washington）的Jacquelyn Neibauer与Rick Keil在本次航次中部署了McClane泵；Jacquelyn Neibauer负责样品前处理；华盛顿大学的Megan Duffy与Clara Fuchsman负责数据分析。