Water quality data, Wailupe, HI
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Title of dataset Water quality data, Wailupe, HIAbstract Coastal groundwater dependent ecosystems take advantage of low salinity, nutrient rich submarine groundwater discharge (SGD). Across the Pacific islands marine macroalgae have been challenged by and adapted to the stress of lowered salinity with a trade-off of nutrient subsidies delivered by SGD. Human alterations of groundwater resources and climate change-driven shifts brought modifications to the magnitude and composition of SGD. This paper discusses how native macroalgae have adapted to SGD nutrient and salinity gradients, but that invasive algae are outcompeting the native ones near SGD with nutrient pollution, due to their higher salinity tolerance. It is important to re-evaluate land and water use practices by modifying groundwater sustainable yields and improving wastewater infrastructure to keep SGD reductions minimal and nitrogen inputs in optimal ranges. This task may be particularly challenging amidst global sea level rise and reductions in groundwater recharge, which threaten coastal groundwater systems and ecosystems dependent on them.Keywords submarine groundwater discharge, salinity water level, nitrate, ammoniumDataset lead author Henrietta DulaiPosition of data author Professor, principal investigatorAddress of data author 1680 East-West Rd POST 707 Honolulu, HI 96822Email address of data author hdulaiov@hawaii.eduPrimary contact person for dataset Henrietta DulaiPosition of primary contact person Professor, principal investigatorAddress of primary contact person 1680 East-West Rd POST 707 Honolulu, HI 96822Email address of primary contact person hdulaiov@hawaii.eduOrganization associated with the data University of Hawaiʻi at MānoaUsage Rights publicly available and free to useGeographic region Wailupe, O’ahu, Hawai’I, USAGeographic coverage 21.2759N, 21.2751N, 157.7624W, 157.7606WTemporal coverage - Begin date Sep 10, 2015Temporal coverage - End date Oct 7, 2015General study design A known coastal spring area at Wailupe, HI was monitored for 28 days.Methods description water salinity measurements were collected at 1-hour intervals with YSI multiparameter sonde (6920 V2-2) deployed 0.3 m below the surface and a 5 m lateral distance from a major spring. The instrument was attached to a float. Water depth measurements at 1-hour intervals were performed using a CTD Diver (Schlumberger Inc. CTD Diver) fixed at the ocean bottom.Discrete sampling was done at low, mid, and high tide for dissolved nutrients. Samples were filtered onsite through a 0.45 μM filter and kept on ice until returning to the lab.Laboratory, field, or other analytical methods Dissolved nutrients (total dissolved nitrogen, total dissolved phosphorus, nirate + nitrite, ammonium, and phosphate) were analyzed with a SEAL AutoAnalyzer 3 HR in the S-Lab at the University of Hawaiʻi at Mānoa. Quality control YSI and CTD salinity were calibrated before each field excursion against a known standard in the lab.For nutrient samples, all bottles were pre-cleaned to appropriate standards. Over 10% of nutrient samples were analyzed in duplicate to assess laboratory analysis accuracy.Additional information
数据集名称：夏威夷州怀卢普地区水质数据 摘要：依赖海岸地下水的生态系统可利用低盐度、富营养的海底地下水排泄（submarine groundwater discharge, SGD）。在太平洋诸岛海域，海洋大型藻类面临盐度降低的胁迫并产生适应性演化，同时以换取海底地下水排泄所提供的营养盐补给为代价。人类对地下水资源的改造以及气候变化驱动的环境变化，改变了海底地下水排泄的规模与组成。本研究探讨了本土大型藻类如何适应海底地下水排泄带来的营养盐与盐度梯度变化，同时指出由于入侵藻类具有更高的盐度耐受性，在受营养盐污染的海底地下水排泄区附近，入侵藻类的竞争优势超过本土藻类。通过调整地下水可持续开采量、完善污水处理基础设施，重新评估土地与用水实践，将海底地下水排泄的减少量控制在最低水平，并将氮输入量维持在最优区间，具有重要意义。在全球海平面上升与地下水补给量减少的背景下，这一任务尤为艰巨，而上述变化正威胁着海岸地下水系统及其依赖此类系统的生态系统。 关键词：海底地下水排泄（submarine groundwater discharge, SGD）、盐度水位、硝酸盐、铵盐 数据集主要作者：Henrietta Dulai 作者职位：教授、首席研究员 作者地址：1680 East-West Rd POST 707 Honolulu, HI 96822 作者邮箱：hdulaiov@hawaii.edu 数据集主要联系人：Henrietta Dulai 联系人职位：教授、首席研究员 联系人地址：1680 East-West Rd POST 707 Honolulu, HI 96822 联系人邮箱：hdulaiov@hawaii.edu 关联机构：夏威夷大学马诺阿分校（University of Hawaiʻi at Mānoa） 使用权限：公开可获取且免费使用 地理区域：美国夏威夷州瓦胡岛怀卢普地区 地理覆盖范围：21.2759°N，21.2751°N，157.7624°W，157.7606°W 时间覆盖范围：开始日期：2015年9月10日；结束日期：2015年10月7日 总体研究设计：对夏威夷州怀卢普地区一处已知海岸泉区开展了为期28天的监测。 方法描述：采用部署于水面下0.3米、距主泉点横向距离5米处的浮标式YSI 6920 V2-2多参数水质监测仪，以1小时间隔采集水体盐度数据；采用固定于海底的斯伦贝谢（Schlumberger Inc.）CTD Diver水深仪，以1小时间隔采集水深数据。在涨潮、平潮与落潮时段进行离散采样以获取溶解态营养盐样品：采样现场通过0.45 μm滤膜过滤样品，并置于冰上保存直至运回实验室。 实验室、现场及其他分析方法：溶解态营养盐（总溶解氮、总溶解磷、硝酸盐+亚硝酸盐、铵盐及磷酸盐）采用SEAL AutoAnalyzer 3 HR高分辨率自动分析仪，在夏威夷大学马诺阿分校S实验室完成分析。 质量控制：每次野外采样前，均使用实验室已知标准溶液对YSI水质仪与CTD盐度测量模块进行校准。对于营养盐样品，所有采样瓶均预先按照标准规程清洗；超过10%的营养盐样品进行了重复分析，以评估实验室分析的准确性。 附加信息：未提供
