Autonomous Flow-Thru (AFT) pH data of the West Florida Shelf: USGS Cruise 11BHM01

The United States Geological Survey (USGS) is conducting a study on the effects of climate change on ocean acidification within the Gulf of Mexico; dealing specifically with the effect of ocean acidification on marine organisms and habitats. To investigate this, the USGS participated in cruises in the West Florida Shelf and northern Gulf of Mexico regions aboard the R/V Weatherbird II, a ship of opportunity lead by Dr. Kendra Daly, of the University of South Florida (USF). This cruise occurred May 03 - 09, 2011, leaving from and returned to Saint Petersburg, Florida. The USGS collected data pertaining to pH, dissolved inorganic carbon (DIC), and total alkalinity in discrete samples. Thirty-four underway discrete samples were collected approximately hourly over a span of 1632 kilometer (km) track line, additionally 44 discrete samples were taken at four stations, these were taken at various depths. Flow-through conductivity-temperature-depth (CTD) data were collected, which includes temperature, salinity, and pH. Corroborating the USGS data are the vertical CTD profiles collected by USF, using the following sensors: CTD, oxygen, chlorophyll fluorescence, optical backscatter, and transmissometer. Additionally, discrete depth samples for nutrients, chlorophyll, and particulate organic carbon/nitrogen were collected.

美国地质调查局（United States Geological Survey, USGS）正开展一项针对气候变化对墨西哥湾海洋酸化影响的研究，重点探究海洋酸化对海洋生物及其栖息地的效应。为开展此项研究，美国地质调查局参与了西佛罗里达陆架与墨西哥湾北部海域的科考航次，搭乘由南佛罗里达大学（University of South Florida, USF）肯德拉·达利博士牵头的机遇级科考船“R/V Weatherbird II”号。本次航次于2011年5月3日至9日开展，往返均以佛罗里达州圣彼得斯堡为起讫港。美国地质调查局采集了离散样品中的pH值、溶解无机碳（dissolved inorganic carbon, DIC）及总碱度数据：在总长1632千米的测线上，以约每小时1次的频率采集了34个走航离散样品；此外在4个站位采集了44个不同深度的离散样品。团队同时采集了流动式温盐深（conductivity-temperature-depth, CTD）数据，涵盖温度、盐度及pH值。与美国地质调查局数据相互佐证的，是南佛罗里达大学采集的垂直CTD剖面数据，其搭载的传感器包括CTD、溶氧传感器、叶绿素荧光传感器、光学后向散射传感器及透射率计。此外，团队还采集了营养盐、叶绿素及颗粒有机碳/氮的离散深度样品。