Coastal phytoplankton and mercury dynamics in watersheds along the U.S. East Coast from New Jersey to Maine assessed using particulate and dissolved samples collected in 2015 and 2016
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<p>The data in each year are grouped by Location, Filter size, and measured parameters for each size fraction, as well as the measured dissolved parameters:</p> <p><strong><u>Location</u></strong>: state, site name and sub-location (in many instances these are sites with high (HOC) and low (LOC) organic carbon sediments), sampling month and sampling time in terms of tide (HT = high tide, LT = low tide, FL = falling and RS = rising tide; if more than one sample at a tide was collected, this is indicated, e.g. HT1, HT2), latitude and longitude</p> <p><strong><u>Filter size</u></strong>: Filtering protocols were not exactly identical between years. In 2015, samples were sequentially filtered so particulate samples are >20 µm (large fraction) and 0.2-20 µm (small fraction). In 2016, water was sampled through filters independently so samples are >2 µm (bulk) and <20 µm (small fraction). For each filter, the following parameters were measured and are recorded: total suspended solids (TSS, mg/L), chlorophyll a (Chl a, µg/L) and phaeopigment (Pha, µg/L), particulate total Hg (part. HgT, pmol/g) and particulate methylmercury (part. MeHg, pmol/g).</p> <p><strong><u>Dissolved parameters</u></strong>: For each location, a filtered sample was analyzed for: dissolved total mercury (diss. HgT, pM), dissolved methylmercury (diss. MeHg, pM), and dissolved organic carbon (DOC, µM). Salinity and temperature (degrees C) were also recorded for each sample.</p>
每年的数据均按采样地点、滤膜孔径、各粒径组分的实测参数，以及实测溶解态参数进行分组。 **<u>采样地点</u>**：包含州名、采样点名称及子采样点（多数情况下，这类子采样点分别对应高有机碳（High Organic Carbon, HOC）与低有机碳（Low Organic Carbon, LOC）沉积物点位）、采样月份，以及以潮汐状态标注的采样时刻（HT=高潮位，LT=低潮位，FL=落潮，RS=涨潮；若同一潮汐状态下采集多份样品，会以HT1、HT2等形式标注），同时记录采样点位的经纬度。 **<u>滤膜孔径</u>**：不同年份的过滤流程不完全一致。2015年采用连续过滤方式，因此颗粒物样品分为>20 µm（大粒径组分）与0.2~20 µm（小粒径组分）两类；2016年则通过独立过滤流程采集水样，颗粒物样品分为>2 µm（总颗粒物）与<20 µm（小粒径组分）两类。针对每一级过滤后的样品，均测定并记录以下参数：总悬浮颗粒物（Total Suspended Solids, TSS, mg/L）、叶绿素a（Chlorophyll a, Chl a, µg/L）、脱镁叶绿素（Pha, µg/L）、颗粒态总汞（particulate total Hg, part. HgT, pmol/g）及颗粒态甲基汞（particulate methylmercury, part. MeHg, pmol/g）。 **<u>溶解态参数</u>**：针对每个采样点位，均对过滤后的水样开展以下分析：溶解态总汞（dissolved total mercury, diss. HgT, pM）、溶解态甲基汞（dissolved methylmercury, diss. MeHg, pM），以及溶解态有机碳（dissolved organic carbon, DOC, µM）。此外，每份样品还记录了盐度与水温（单位：摄氏度）。
