CTD data of the Hawaii Ocean Time-series (HOT) program in the North Pacific 100 miles north of Oahu, Hawaii for cruises HOT228-237 during 2011 (NODC Accession 0101727)

The HOT program makes repeated observations of the physics, biology and chemistry at a site approximately 100 km north of Oahu, Hawaii. Two stations are visited about once a month: Kahe Point (Station 1: 21.34N, 158.27W) and Station ALOHA (Station 2: 22.75N, 158W). Various other stations are made intermittently in support of similar research objectives or mooring deployments. HOT CTD data are collected using a SeaBird CTD 9-11 Plus with dual sensors at the maximum sampling rate of 24 samples per second (24 Hz). They are screened for errors and processed to 2-dbar averages. Starting in 2006, the percent transmission field was replaced with a nitrate in the dataset. This NODC Accession contains CTD data for HOT cruises 228-237 during 2011. Bottle and thermosalinograph data from the same cruises are available in separate NODC accessions. Cruise 228 returned to port two days early due to winch problems. Only three hydrographic casts were made.HOT计划会对夏威夷瓦胡岛以北约100公里的海域开展重复观测，涵盖该区域的物理、生物与化学过程。该计划每月约对两个固定站位开展一次观测：卡赫角站（1号站：北纬21.34°，西经158.27°）与ALOHA站（2号站：北纬22.75°，西经158°）。此外会根据同类研究目标或锚系部署需求，间歇性布设其他观测站位。 HOT的CTD（温盐深仪，Conductivity, Temperature, Depth）数据采用SeaBird CTD 9-11 Plus型设备采集，该设备搭载双传感器，最高采样速率可达24样本每秒（24 Hz）。采集完成后会先进行误差筛查，再处理为2分巴（dbar）平均数据。自2006年起，数据集中原有的透光率百分比字段被替换为硝酸盐浓度数据。 本次NODC（美国国家海洋数据中心，National Oceanographic Data Center）收录的数据集包含2011年HOT计划第228至237航次的CTD数据。同航次的采水瓶数据与温盐计数据已分别收录于其他NODC数据集中。 第228航次因绞车故障提前两天返航，仅完成了3次水文剖面观测。