Temperature vs depth profile at heat flux station HF1502 of RV SONNE cruise SO240@en

The heat flux measurements presented in this report were made during expedition SO240 on the German research vessel RV Sonne. The cruise started on the 3rd of may 2015 in Manzanillo (Mexico) and ended on the 16th of June 2015 in Manzanillo (Mexico). A total of 109 heat flux measurements were successfully carried out accompanied by detailed sediment echosounder and single channel seismic measurements on all heat flux profiles. The aim of the measurements was to investigate whether low-temperature hydrothermal fluids diffuse at the seafloor where the oceanic basement is not covered by sediments. While the measurements clearly showed that cold seawater enters the subsurface at one seamount investigated in detail, no diffuse leakage of hydrothermal fluids could be detected at any location.本报告中的热通量（heat flux）测量数据，采集于德国科考船“索恩号（RV Sonne）”执行的SO240科考航次。本次航次于2015年5月3日从墨西哥曼萨尼约港启航，2015年6月16日返回同一港口。本次科考共成功完成109组热通量测量，所有热通量剖面均配套开展了详细的沉积物回声测深（sediment echosounder）与单道地震（single channel seismic）测量。本次测量的核心研究目标为：探究洋壳基底未被沉积物覆盖的海底区域，是否存在低温热液流体的弥散扩散现象。观测结果清晰证实，冷海水会在一处被详细研究的海山区域渗入海底亚表层，但未在任何观测点位检测到热液流体的弥散性渗漏。