文章基本信息

标题：IMAGING THERMOHALINE FINE STRUCTURE USING MULTICHANNEL SEISMIC REFLECTION IN THE NORTHERN MALUKU SEA
本地全文：下载
作者：Randi Firdaus ; Randi Firdaus ; Henry Munandar Manik 等
期刊名称：E-Journal Ilmu dan Teknologi Kelautan Tropis
印刷版ISSN：2087-9423
电子版ISSN：2085-6695
出版年度：2021
卷号：13
期号：1
页码：151-162
DOI：10.29244/jitkt.v13i1.32346
语种：English
出版社：Bogor Agricultural University
摘要：Low-frequency acoustic such as marine seismic that has been commonly used in geological mapping is nowadays being developed as tools to map the water columns. This study aims to map thermohaline fine structure in the Northern Maluku Sea. Seismic reflection data from 72 channel along 239 km track line was processed to delineate water column structure. The depth-distance seismic oceanography section clearly showed reflectors at depth of 400 m and 800 m correspond to lower boundary of the seasonal and permanent thermocline layers, respectively. The reflections between depth of 400 m and 800 m were caused by the thermohaline staircase as confirmed by CTD data. Water column reflections showed the presence of internal wave-like structure in the northwestern Tufure sill which has height and wavelength about 102 m and 17 km, respectively. The seismic amplitude in the water column corresponded to the vertical contrast of physical oceanographic parameters such as temperature, salinity, and sound speed. Reflections in the water column could be caused by temperature gradients ranging contrast from 0.03°C/m to >0.20°C/m. The acoustic impedance in the internal wave-like zone was ranging from 0.8 x 106 kg/m3 m/s to 2.06 x 106 kg/m3 m/s. This research revealed that the marine seismic data can be useful for studying the water column characteristics in the Northern Maluku Sea.
关键词：acoustic impedance;ocean acoustic;seismic oceanography;seismic reflection