Chemical and isotopic data from wetland pond water samples collected in the Cottonwood Lake Study Area, Stutsman County, North Dakota, USA, 2015–2019

This U.S. Geological Survey data release contains chemical, isotopic, and physical data from wetland pond water samples collected at the Cottonwood Lake Study Area, Stutsman County, North Dakota, USA. Samples were collected monthly during the growing season (April or May through September) in 2015, 2016, 2017, and 2019 and in August 2018. Temperature, specific conductance, and pH were measured in situ. Major cations, select trace cations, chloride, fluoride, sulfate, and nitrate were determined for all samples. Stable oxygen and hydrogen isotope ratios of water were determined for samples collected from 2015 to 2017. Total dissolved nitrogen, dissolved organic carbon, absorbance at 254 nm, and stable carbon isotope ratios of dissolved inorganic carbon were determined for samples collected in 2015 and 2016. Dissolved ammonium and phosphate were determined for samples collected in 2016 and April and May 2017.

本数据集由美国地质调查局（U.S. Geological Survey）发布，包含采自美国北达科他州斯塔茨曼县棉木湖研究区（Cottonwood Lake Study Area）湿地池塘水样的化学、同位素及物理数据。采样于2015、2016、2017、2019年的生长季（4月或5月至9月）每月开展，另于2018年8月补充采集水样。现场原位测定了水温、比电导率及pH值；所有水样均完成了主要阳离子、选定痕量阳离子、氯离子、氟离子、硫酸盐及硝酸盐的含量测定。2015至2017年采集的水样测定了水体的稳定氧、氢同位素比值。2015和2016年采集的水样额外测定了总溶解氮、溶解有机碳、254 nm处吸光度，以及溶解无机碳的稳定碳同位素比值。2016年及2017年4、5月采集的水样则测定了溶解态铵及磷酸盐含量。