Water nitrate and coral skeleton nitrogen isotopes at Surprise Island (New Caledonia), Tromelin and Grand Glorieuse Island (Western Indian Ocean)

This dataset presents data collected along a transect sampled on two dates (6th and 9th of July 2019) on the reef flat of Surprise Island in the D'entrecasteaux Reefs, from land to ocean during the IGUANE cruise. Samples were also collected in the groundwater lens of the island and in the water column offshore of the island. As a comparison, the grounwater lens from two other tropical coral islands from the Western Indian Ocean (Tromelin and Grande Glorieuse) was also sampled, in April 2019 on the occasion of the Climate Eparses and CLIM-EPARSE programs. Urea, ammonium and nitrate concentrations were analyzed. Nitrate plus nitrite and nitrate δ15N (vs. AIR) and δ18O (vs. VSMOW) measurements have been performed using the denitrifier method (Weigand et al., 2016; doi:10.1002/rcm.7570) on seawater and groundwater samples from the IGUANE expedition (2019; doi:10.17600/18000897). Samples for nitrate δ15N (vs. […]

本数据集展示了在2019年7月6日和9日两个日期，于D'entrecasteaux群岛的Surprise岛礁坪上，从陆地至海洋的IGUANE巡航期间采集的横断面数据。同时，在岛屿的地下水透镜以及岛屿近海的水柱中也进行了采样。为进行比较，来自西印度洋的两个热带珊瑚岛（Tromelin和Grande Glorieuse）的地下水透镜亦在2019年4月气候异常和CLIM-EPARSE项目中进行了采样。对尿素、铵和硝酸盐浓度进行了分析。利用反硝化法（Weigand等人，2016年；DOI：10.1002/rcm.7570）对IGUANE探险（2019年；DOI：10.17600/18000897）的海水和地下水样品进行了硝酸盐及其亚硝酸盐和硝酸盐δ15N（相对于空气）以及δ18O（相对于VSMOW）的测量。