International circumpolar compilation of nutrient concentration data from Antarctic land-fast sea ice

This dataset is an international circumpolar compilation of currently available macronutrient concentration data from Antarctic land-fast sea ice cores collected at locations around Antarctica between 1997 and 2021, covering the full seasonal cycle. These data have been compiled from peer-reviewed publications, field reports, data repositories and direct contributions from researchers and research teams from across the international scientific community working in sea-ice biogeochemistry. The dataset includes concentrations of nitrate, nitrite, ammonium, phosphate and silicic acid, as well as ancillary measurements (e.g., ice temperature, salinity and other biogeochemical measurements) where available. Observations of sea-ice properties were also taken at the time of sampling, including ice thickness, texture, structure and age, snow thickness, and freeboard level, and can be used to contextualise the biogeochemical data. A total of 245 geo-referenced fast-ice cores are included in the compilation; 21 cores from the Indian Sector, 70 from the West Pacific Sector, 67 from the Ross Sea, 85 from the West Antarctic Peninsula, and 2 from the Weddell Gyre. 232 cores were from first-year ice, 12 cores were from multi-year ice and 1 was from second-year ice. Samples of sub-ice platelet layer ice and interstitial water (n=111) were collected in some studies and are included where available.For fast-ice cores, most of the nutrient concentrations were measured as bulk nutrient concentrations of melted ice core sections (n=1914). Cores were collected from fast ice using ice corers (0.09 to 0.14 m diameter) and cut into sections of lengths ranging from 0.05 to 0.75 m (mean 0.15 m, median 0.12 m). Sections were cut using clean stainless-steel saws and then melted in the dark at ambient temperature or ≤4°C. A small number of measurements are from sea-ice brine samples, obtained by centrifugation of ice core sections (lengths 0.20 to 0.75 m, mean 0.34, median 0.30, n=22).Nutrient concentrations were measured in filtered and unfiltered samples, either in laboratories on Antarctic research stations/ships shortly after melting or centrifugation, or in home laboratories following storage at ≤-18°C or by fixing with mercuric chloride and refrigeration at ≤4°C. The nutrient concentrations in this compilation are mostly from automated or manual colorimetric analysis (e.g., Hydes et al., 2010). Some studies analysed ammonium (NH4+) concentrations using ortho-phthaldialdehyde (OPA) and fluorometry (Holmes et al., 1999). Specific analytical protocols varied across studies, but in general calibration standards were prepared using artificial seawater or low-nutrient seawater with salinities similar to the samples being analysed to avoid matrix effects. Across all studies, recommended procedures were followed as closely as possible (Becker et al., 2020).Nutrient concentrations from the sub-ice platelet layer were measured in unconsolidated platelets that were sieved and melted, in interstitial waters that were separated by sieving or filtration, and in mixtures of platelets and interstitial waters that were not separated. Analysis was conducted as for melted ice core sections.The data are provided in two spreadsheets in .csv format. Henley-et-al-2023_Antarctic-fast-ice-nutrients_final.csv contains all data from ice cores and melted ice core sections. Henley-et-al-2023_Antarctic-fast-ice-nutrients_platelet.csv contains all data from the sub-ice platelet layer. Both spreadsheets contain all available data and supporting metadata. Each column heading is intended to be as informative as possible, and is given and described below.These data were funded by the following bodies/projects:Australian Antarctic Science project 4546 Other Australian Government funding: ASCI000002, SR200100008Also UK Natural Environment Research Council grant NE/K010034/1This data compilation and analysis were carried out under the auspices of the Scientific Community on Oceanic Research (SCOR) working group on Biogeochemical Exchange Processes at Sea-Ice Interfaces (BEPSII; WG-140).This data compilation is the focus of Henley et al., 2023, Marine Chemistry. This paper provides more information about the data provided here and presents a detailed analysis of the results and scientific findings. This paper should be read by any person interested in using this compiled dataset and used alongside the dataset to inform and support any further analysis.Column A – numerical order of data provided in the compilationCruise/Field Campaign – name of cruise or field campaignStudy (ice properties and nutrients) – name of study where ice properties and nutrients were measured, or name of data providerIce type (fast/pack) – ice type; for this compilation all ice core data are from fast iceIce type (age) – age of ice, in categories of first-year ice, second-year ice or multi-year iceIce texture (cruise/campaign) – ice texture described for the cruise or field campaignIce texture (section) – ice texture described for the ice core or section sampledComments (ice properties) – any additional comments recorded by the field team with respect to ice propertiesStation Number – number or name of sampling stationDate (YYYYMMDD) – sampling date in the format YYYYMMDDDate (DD/MM/YYYY) – sampling date in the format DD/MM/YYYYJulian day – sampling date in the format julian dayLatitude – latitude of sampling location in decimal degreesLongitude – longitude of sampling location in decimal degreesIce Core ID – ice core identifier code or name, as providedInstrument type – name or description of instrument used for ice coringCorer diameter (m) – diameter of ice corer, in metresIce Thickness (core length, m) – ice thickness determined from length of ice core, in metresSnow Thickness (m) – snow thickness on top of sea ice, in metresFreeboard (m) – the difference between the height of the sea ice upper surface and the seawater surface, in metres. A positive freeboard shows that the sea ice surface is above that of seawater; a negative freeboard shows that the sea ice surface is below that of seawater.Comments (general) – any additional comments recorded by the field teamExtrapolation – whether all measurements were made directly or some extrapolated from other measurements. In the vast majority of cases, all measurements were made directly (Extrapolation = no). Where Extrapolation = yes, details of extrapolation are provided in Comments (general).Ice Thickness (measured, m) – ice thickness measured by various methods. Where this differs from Ice Thickness (core length, m), measured ice thickness was greater than the length of core sampled and was measured as described in Comments (general).Core depth (average, m) – depth of mid-point of core section, from top of core, in metresCore depth (average, %) – depth of mid-point of core section, from top of core, normalised to ice core length, in percentCore depth (T, m) – depth at which ice core temperature was measured, from top of core, in metresTemperature (deg C) – ice core temperature in degrees CelsiusLower Limit of Salinity Depth range (m) – depth of bottom of section for salinity measurement, from top of core, in metresUpper Limit of Salinity Depth range (m) – depth of top of section for salinity measurement, from top of core, in metresSalinity – salinity of melted ice core section, no unitsLower Limit of d18O Depth range (m) – depth of bottom of section for d18O measurement, from top of core, in metresUpper Limit of d18O Depth range (m) – depth of top of section for d18O measurement, from top of core, in metresd18O (‰) – stable isotope composition of oxygen (d18O) in melted ice core section, in per milleLower Limit of Chlorophyll Depth range (m) – depth of bottom of section for chlorophyll measurement, from top of core, in metresUpper Limit of Chlorophyll Depth range (m) – depth of top of section for chlorophyll measurement, from top of core, in metresChlorophyll (ug.L-1) – chlorophyll concentration of melted ice core section, in µg L-1Lower Limit of POC Depth range (m) – depth of bottom of section for POC measurement, from top of core, in metresUpper Limit of POC Depth range (m) – depth of top of section for POC measurement, from top of core, in metresPOC (umol.L-1) – particulate organic carbon (POC) concentration of melted ice core section, in µmol L-1Lower Limit of PON Depth range (m) – depth of bottom of section for PON measurement, from top of core, in metresUpper Limit of PON Depth range (m) – depth of top of section for PON measurement, from top of core, in metresPON (umol.L-1) – particulate organic nitrogen (PON) concentration of melted ice core section, in µmol L-1Lower Limit of Nitrate Depth range (m) – depth of bottom of section for nitrate measurement, from top of core, in metresUpper Limit of Nitrate Depth range (m) – depth of top of section for nitrate measurement, from top of core, in metresNitrate+Nitrite (umol.L-1) – nitrate+nitrite concentration of melted ice core section, in µmol L-1Nitrate [NO3-] (umol.L-1) – nitrate concentration of melted ice core section, in µmol L-1Lower Limit of Nitrite Depth range (m) – depth of bottom of section for nitrite measurement, from top of core, in metresUpper Limit of Nitrite Depth range (m) – depth of top of section for nitrite measurement, from top of core, in metresNitrite [NO2-] (umol.L-1) – nitrite concentration of melted ice core section, in µmol L-1Lower Limit of Ammonium Depth range (m) – depth of bottom of section for ammonium measurement, from top of core, in metresUpper Limit of Ammonium Depth range (m) – depth of top of section for ammonium measurement, from top of core, in metresAmmonium [NH4+] (umol.L-1) – ammonium concentration of melted ice core section, in µmol L-1Lower Limit of Phosphate Depth range (m) – depth of bottom of section for phosphate measurement, from top of core, in metresUpper Limit of Phosphate Depth range (m) – depth of top of section for phosphate measurement, from top of core, in metresPhosphate [PO43-] (umol.L-1) – phosphate concentration (measured as total soluble reactive phosphorus) of melted ice core section, in µmol L-1Lower Limit of Silicic Acid Depth range (m) – depth of bottom of section for silicic acid measurement, from top of core, in metresUpper Limit of Silicic Acid Depth range (m) – depth of top of section for silicic acid measurement, from top of core, in metresSilicic Acid [Si(OH)4] (umol.L-1) – silicic acid concentration (measured as total dissolved silicon) of melted ice core section, in µmol L-1Lower Limit of DOC Depth range (m) – depth of bottom of section for DOC measurement, from top of core, in metresUpper Limit of DOC Depth range (m) – depth of top of section for DOC measurement, from top of core, in metresDOC (umol.L-1) – dissolved organic carbon (DOC) concentration of melted ice core section, in µmol L-1Lower Limit of DON Depth range (m) – depth of bottom of section for DON measurement, from top of core, in metresUpper Limit of DON Depth range (m) – depth of top of section for DON measurement, from top of core, in metresDON (umol.L-1) – dissolved organic nitrogen (DON) concentration of melted ice core section, in µmol L-1Nitrate+Nitrite_sal (umol.L-1) – nitrate+nitrite concentration of melted ice core section, normalised to seawater salinity value of 34.3, in µmol L-1Nitrate [NO3-]_sal (umol.L-1) – nitrate concentration of melted ice core section, normalised to seawater salinity value of 34.3, in µmol L-1Nitrite [NO2-]_sal (umol.L-1) – nitrite concentration of melted ice core section, normalised to seawater salinity value of 34.3, in µmol L-1Ammonium [NH4+]_sal (umol.L-1) – ammonium concentration of melted ice core section, normalised to seawater salinity value of 34.3, in µmol L-1Phosphate [PO43-]_sal (umol.L-1) – phosphate concentration of melted ice core section, normalised to seawater salinity value of 34.3, in µmol L-1Silicic Acid [Si(OH)4]_sal (umol.L-1) – silicic acid concentration of melted ice core section, normalised to seawater salinity value of 34.3, in µmol L-1The majority of columns are common between both spreadsheets. The only columns where the platelet ice spreadsheet differs from the ice core one are as follow.Ice type (platelet) – type of sample from sub-ice platelet layer. plate/int = mixed platelet ice and interstitial waters; UPI = unconsolidated platelet ice; IW = interstitial water; BI = bottom ice; GI = granular ice. In each case, further details are given in Comments (ice properties) and Comments (general). Where IW is accompanied by a depth, this is the depth from the top of the platelet layer (interface with bottom ice) in centimetres.Ice Thickness (m) – ice thickness determined from lengths of ice cores, in metresDepth (#, m) – depth of sampling from the top of the platelet layer (interface with bottom ice), in metres, or depth code as providedFor questions about this dataset please contact Dr Sian Henley using the contact details provided.References used in dataset descriptionBecker, S., Aoyama, M., Woodward, E. M. S., Bakker, K., Coverly, S., Mahaffey, C., and Tanhua, T. (2020). GO-SHIP Repeat Hydrography Nutrient Manual: The Precise and Accurate Determination of Dissolved Inorganic Nutrients in Seawater, Using Continuous Flow Analysis Methods. Frontiers in Marine Science, 7. doi: 10.3389/fmars.2020.581790Holmes, R. M., Aminot, A., Kerouel, R., Hooker, B. A., and Peterson, B. J. (1999). A simple and precise method for measuring ammonium in marine and freshwater ecosystems. Canadian Journal of Fisheries and Aquatic Sciences, 56(10), 1801-1808. doi: 10.1139/cjfas-56-10-1801Hydes, D. J., Aoyama, M., Aminot, A., Bakker, K., Becker, S., Coverly, S., Daniel, A., Dickson, A. G., Grosso, O., Kerouel, R., van Ooijen, J., Sato, K., Tanhua, T., Woodward, E. M. S., and Zhang, J. Z. (2010). Determination of Dissolved Nutrients (N, P, SI) in Seawater With High Precision and Inter-Comparability Using Gas-Segmented Continuous Flow Analysers. In E. M. Hood, C. L. Sabine, and B. M. Sloyan (Eds.), The GO-SHIP Repeat Hydrography Manual: A Collection of Expert Reports and Guidelines. Version 1. (Vol. IOCCP Report Number 14). doi: http://dx.doi.org/10.25607/OBP-15

本数据集为一套国际环南极汇编数据集，收录了1997年至2021年间于南极周边各站点采集的南极固着海冰（land-fast sea ice）岩芯中的现有宏量营养素（macronutrient）浓度数据，覆盖完整季节循环周期。本数据集的数据来源于同行评议期刊论文、野外报告、数据仓储，以及来自全球从事海冰生物地球化学（sea-ice biogeochemistry）研究的国际科学界研究人员与团队的直接贡献。

数据集涵盖硝酸盐、亚硝酸盐、铵盐、磷酸盐与硅酸的浓度数据，同时收录可用的辅助测量数据（如冰温、盐度及其他生物地球化学测量结果）。采样同时还记录了海冰属性观测数据，包括冰厚、冰纹理、冰结构、冰龄、雪厚及干舷高度（freeboard level），可用于辅助阐释生物地球化学数据的环境背景。

本汇编共包含245根经地理坐标标注的固着海冰岩芯：其中印度洋扇区21根、西太平洋扇区70根、罗斯海67根、南极半岛西部85根、威德尔环流2根。岩芯冰龄分布为：232根来自一年冰（first-year ice），12根来自多年冰（multi-year ice），1根来自二年冰（second-year ice）。部分研究中采集了冰下片状冰层（sub-ice platelet layer）冰样与间隙水（interstitial water）样本（共111份），可用样本均已收录至本数据集。

对于固着海冰岩芯，多数营养盐浓度以融化后的岩芯切片的总营养盐浓度形式测定（共1914组数据）。岩芯采集使用直径0.09~0.14 m的冰钻，切割成长度0.05~0.75 m的切片（平均长度0.15 m，中位数0.12 m）。切片使用洁净不锈钢锯切割，随后于避光环境中在室温或≤4℃条件下融化。少量测量数据来自海冰盐水样本，通过离心冰芯切片获得（切片长度0.20~0.75 m，平均长度0.34 m，中位数0.30 m，共22组）。

营养盐浓度在过滤与未过滤的样本中测定，测定场景包括：融化或离心后即刻于南极科考站/科考船实验室进行，或在≤-18℃保存后、或使用氯化汞固定并于≤4℃冷藏后，于本国实验室进行测定。本汇编中的营养盐浓度数据多数采用自动或手动比色分析法（colorimetric analysis）测定（如Hydes等，2010）。部分研究使用邻苯二甲醛（ortho-phthaldialdehyde, OPA）与荧光光度法（fluorometry）测定铵盐（NH4+）浓度（Holmes等，1999）。

不同研究采用的具体分析规程存在差异，但总体而言，为避免基质效应（matrix effects），校准标准溶液均使用人工海水或与待测样本盐度相近的低营养盐海水配制。所有研究均尽可能遵循推荐的分析流程（Becker等，2020）。冰下片状冰层的营养盐浓度在以下样本中测定：经筛分后融化的未固结片状冰样本、经筛分或过滤分离的间隙水样本，以及未分离的片状冰与间隙水混合样本。分析流程与融化后的冰芯切片一致。

本数据集以逗号分隔值（.csv）格式的两份电子表格提供：Henley-et-al-2023_Antarctic-fast-ice-nutrients_final.csv 包含所有冰芯与融化冰芯切片的数据；Henley-et-al-2023_Antarctic-fast-ice-nutrients_platelet.csv 包含所有冰下片状冰层的数据。两份电子表格均收录所有可用数据及配套元数据（metadata）。每份表格的列标题均尽可能具备说明性，下文将对各列标题进行逐一说明。

列A：本汇编中数据的序号
航次/野外考察：航次或野外考察的名称
研究（冰属性与营养盐）：记录冰属性与营养盐数据的研究名称，或数据提供者名称
冰类型（固着/浮冰）：冰的类型；本汇编中所有冰芯数据均来自固着海冰
冰类型（冰龄）：冰的冰龄分类，包括一年冰、二年冰或多年冰
冰纹理（航次/考察）：对应航次或野外考察记录的冰纹理信息
冰纹理（切片）：对应冰芯或采样切片记录的冰纹理信息
备注（冰属性）：野外团队记录的与冰属性相关的其他补充说明
采样站编号：采样站点的编号或名称
采样日期（YYYYMMDD）：格式为YYYYMMDD的采样日期
采样日期（DD/MM/YYYY）：格式为DD/MM/YYYY的采样日期
儒略日：格式为儒略日的采样日期
纬度：采样点纬度，以十进制度表示
经度：采样点经度，以十进制度表示
冰芯编号：冰芯标识符代码或名称，按提供方格式记录
仪器类型：冰芯钻探使用的仪器名称或描述
冰钻直径（m）：冰钻直径，单位为米
冰厚（岩芯长度，m）：通过冰芯长度计算得到的冰厚，单位为米
雪厚（m）：海冰上方的雪层厚度，单位为米
干舷高度（m）：海冰上表面与海水表面的高度差，单位为米。正干舷表示海冰表面高于海水表面，负干舷表示海冰表面低于海水表面。
备注（通用）：野外团队记录的其他补充说明
外推：是否所有测量均为直接测定，或部分测量由其他测量值外推得到。绝大多数情况下所有测量均为直接测定（外推=否）。当外推=是时，外推的具体细节将在备注（通用）中说明。
冰厚（实测，m）：通过多种方法实测得到的冰厚。当该值与冰厚（岩芯长度，m）不一致时，实测冰厚大于采样岩芯的长度，具体细节将在备注（通用）中说明。
岩芯切片平均深度（m）：岩芯切片中点距冰芯顶部的深度，单位为米
岩芯切片平均深度（%）：岩芯切片中点距冰芯顶部的深度，以冰芯长度归一化后的百分比表示
冰温测量深度（T, m）：冰芯温度测量点距冰芯顶部的深度，单位为米
冰温（℃）：冰芯温度，单位为摄氏度
盐度测量区间下限（m）：盐度测量的切片底部距冰芯顶部的深度，单位为米
盐度测量区间上限（m）：盐度测量的切片顶部距冰芯顶部的深度，单位为米
盐度：融化后冰芯切片的盐度，无单位
δ¹⁸O测量区间下限（m）：δ¹⁸O测量的切片底部距冰芯顶部的深度，单位为米
δ¹⁸O测量区间上限（m）：δ¹⁸O测量的切片顶部距冰芯顶部的深度，单位为米
δ¹⁸O（‰）：融化后冰芯切片的氧稳定同位素组成（δ¹⁸O），单位为千分比
叶绿素测量区间下限（m）：叶绿素测量的切片底部距冰芯顶部的深度，单位为米
叶绿素测量区间上限（m）：叶绿素测量的切片顶部距冰芯顶部的深度，单位为米
叶绿素（µg·L⁻¹）：融化后冰芯切片的叶绿素浓度，单位为µg L⁻¹
颗粒有机碳（POC, Particulate Organic Carbon）测量区间下限（m）：颗粒有机碳（POC）测量的切片底部距冰芯顶部的深度，单位为米
颗粒有机碳测量区间上限（m）：POC测量的切片顶部距冰芯顶部的深度，单位为米
POC（µmol·L⁻¹）：融化后冰芯切片的颗粒有机碳浓度，单位为µmol L⁻¹
颗粒有机氮（PON, Particulate Organic Nitrogen）测量区间下限（m）：PON测量的切片底部距冰芯顶部的深度，单位为米
颗粒有机氮测量区间上限（m）：PON测量的切片顶部距冰芯顶部的深度，单位为米
PON（µmol·L⁻¹）：融化后冰芯切片的颗粒有机氮浓度，单位为µmol L⁻¹
硝酸盐测量区间下限（m）：硝酸盐测量的切片底部距冰芯顶部的深度，单位为米
硝酸盐测量区间上限（m）：硝酸盐测量的切片顶部距冰芯顶部的深度，单位为米
硝酸盐+亚硝酸盐（µmol·L⁻¹）：融化后冰芯切片的硝酸盐+亚硝酸盐浓度，单位为µmol L⁻¹
硝酸盐[NO3⁻]（µmol·L⁻¹）：融化后冰芯切片的硝酸盐浓度，单位为µmol L⁻¹
亚硝酸盐测量区间下限（m）：亚硝酸盐测量的切片底部距冰芯顶部的深度，单位为米
亚硝酸盐测量区间上限（m）：亚硝酸盐测量的切片顶部距冰芯顶部的深度，单位为米
亚硝酸盐[NO2⁻]（µmol·L⁻¹）：融化后冰芯切片的亚硝酸盐浓度，单位为µmol L⁻¹
铵盐测量区间下限（m）：铵盐测量的切片底部距冰芯顶部的深度，单位为米
铵盐测量区间上限（m）：铵盐测量的切片顶部距冰芯顶部的深度，单位为米
铵盐[NH4+]（µmol·L⁻¹）：融化后冰芯切片的铵盐浓度，单位为µmol L⁻¹
磷酸盐测量区间下限（m）：磷酸盐测量的切片底部距冰芯顶部的深度，单位为米
磷酸盐测量区间上限（m）：磷酸盐测量的切片顶部距冰芯顶部的深度，单位为米
磷酸盐[PO4³⁻]（µmol·L⁻¹）：融化后冰芯切片的磷酸盐浓度（以总可溶性活性磷计），单位为µmol L⁻¹
硅酸测量区间下限（m）：硅酸测量的切片底部距冰芯顶部的深度，单位为米
硅酸测量区间上限（m）：硅酸测量的切片顶部距冰芯顶部的深度，单位为米
硅酸[Si(OH)4]（µmol·L⁻¹）：融化后冰芯切片的硅酸浓度（以总溶解硅计），单位为µmol L⁻¹
溶解有机碳（DOC, Dissolved Organic Carbon）测量区间下限（m）：DOC测量的切片底部距冰芯顶部的深度，单位为米
溶解有机碳测量区间上限（m）：DOC测量的切片顶部距冰芯顶部的深度，单位为米
DOC（µmol·L⁻¹）：融化后冰芯切片的溶解有机碳浓度，单位为µmol L⁻¹
溶解有机氮（DON, Dissolved Organic Nitrogen）测量区间下限（m）：DON测量的切片底部距冰芯顶部的深度，单位为米
溶解有机氮测量区间上限（m）：DON测量的切片顶部距冰芯顶部的深度，单位为米
DON（µmol·L⁻¹）：融化后冰芯切片的溶解有机氮浓度，单位为µmol L⁻¹
硝酸盐+亚硝酸盐_盐度归一化（µmol·L⁻¹）：融化后冰芯切片的硝酸盐+亚硝酸盐浓度，已归一化至海水盐度34.3，单位为µmol L⁻¹
硝酸盐[NO3⁻]_盐度归一化（µmol·L⁻¹）：融化后冰芯切片的硝酸盐浓度，已归一化至海水盐度34.3，单位为µmol L⁻¹
亚硝酸盐[NO2⁻]_盐度归一化（µmol·L⁻¹）：融化后冰芯切片的亚硝酸盐浓度，已归一化至海水盐度34.3，单位为µmol L⁻¹
铵盐[NH4+]_盐度归一化（µmol·L⁻¹）：融化后冰芯切片的铵盐浓度，已归一化至海水盐度34.3，单位为µmol L⁻¹
磷酸盐[PO4³⁻]_盐度归一化（µmol·L⁻¹）：融化后冰芯切片的磷酸盐浓度，已归一化至海水盐度34.3，单位为µmol L⁻¹
硅酸[Si(OH)4]_盐度归一化（µmol·L⁻¹）：融化后冰芯切片的硅酸浓度，已归一化至海水盐度34.3，单位为µmol L⁻¹

两份电子表格的绝大多数列标题均一致。仅冰下片状冰层电子表格存在以下特有列：
冰类型（片状冰层）：冰下片状冰层样本的类型。plate/int = 片状冰与间隙水混合样本；UPI = 未固结片状冰；IW = 间隙水；BI = 底部冰；GI = 粒状冰。各类样本的详细信息将在备注（冰属性）与备注（通用）中说明。若IW后带有深度值，则该值为距片状冰层顶部（与底部冰的界面）的深度，单位为厘米。
冰厚（m）：通过冰芯长度计算得到的冰厚，单位为米
采样深度（#, m）：距片状冰层顶部（与底部冰的界面）的采样深度，单位为米，或按提供方格式记录的深度代码

本数据集的研究得到以下机构/项目资助：澳大利亚南极科学项目4546、澳大利亚政府其他资助项目ASCI000002与SR200100008，以及英国自然环境研究理事会（Natural Environment Research Council）项目NE/K010034/1。

本数据集的汇编与分析工作由海洋研究科学委员会（Scientific Community on Oceanic Research, SCOR）下设的海冰界面生物地球化学交换过程（Biogeochemical Exchange Processes at Sea-Ice Interfaces, BEPSII；WG-140）工作组主导完成。本数据集的汇编成果为Henley等于2023年发表于《Marine Chemistry》的论文。该论文详细介绍了本数据集的相关信息，并对研究结果与科学发现进行了深入分析。所有使用本汇编数据集的研究人员均应参考该论文，将其与数据集配合使用以支撑后续分析工作。

若对本数据集有任何疑问，请通过提供的联系方式联系Sian Henley博士。

数据集描述中引用的文献：
1. Becker, S., Aoyama, M., Woodward, E. M. S., Bakker, K., Coverly, S., Mahaffey, C., and Tanhua, T. (2020). GO-SHIP Repeat Hydrography Nutrient Manual: The Precise and Accurate Determination of Dissolved Inorganic Nutrients in Seawater, Using Continuous Flow Analysis Methods. Frontiers in Marine Science, 7. doi: 10.3389/fmars.2020.581790
2. Holmes, R. M., Aminot, A., Kerouel, R., Hooker, B. A., and Peterson, B. J. (1999). A simple and precise method for measuring ammonium in marine and freshwater ecosystems. Canadian Journal of Fisheries and Aquatic Sciences, 56(10), 1801-1808. doi: 10.1139/cjfas-56-10-1801
3. Hydes, D. J., Aoyama, M., Aminot, A., Bakker, K., Becker, S., Coverly, S., Daniel, A., Dickson, A. G., Grosso, O., Kerouel, R., van Ooijen, J., Sato, K., Tanhua, T., Woodward, E. M. S., and Zhang, J. Z. (2010). Determination of Dissolved Nutrients (N, P, SI) in Seawater With High Precision and Inter-Comparability Using Gas-Segmented Continuous Flow Analysers. In E. M. Hood, C. L. Sabine, and B. M. Sloyan (Eds.), The GO-SHIP Repeat Hydrography Manual: A Collection of Expert Reports and Guidelines. Version 1. (Vol. IOCCP Report Number 14). doi: http://dx.doi.org/10.25607/OBP-15