探针偏角对海底热流测量结果的影响  

Effects on the results of seafloor heat flow measurements by probe tilt

作　　者：徐子英[1,2] 杨小秋[2] 施小斌[2] 曾信[2] 赵俊峰[2] 于传海[2] XU Ziying;YANG Xiaoqiu;SHI Xiaobin;ZENG Xin;ZHAO Junfeng;YU Chuanhai(Key Laboratory of Marine Mineral Resources,Ministry of Land and Resources, Guangzhou Marine Geological Survey, Guangzhou 510075, China;Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences,Guangzhou 510301, China)

机构地区：[1]国土资源部海底矿产资源重点实验室,广州海洋地质调查局,广东广州510075 [2]中国科学院边缘海地质重点实验室,南海海洋研究所,广东广州510301

出　　处：《热带海洋学报》2016年第4期95-101,共7页Journal of Tropical Oceanography

基　　金：国家自然科学基金项目(41106086、41474065);国土资源部海底矿产资源重点实验室开放基金项目(KLMMR-2013-A-10);中国科学院战略性先导科技专项子课题(XDA11040303);中国科学院科研装备研制项目(YZ201136);中国科学院知识创新工程青年人才领域前沿项目(SQ201007);中国科学院边缘海地质重点实验室基金项目(MSGL09-08、MSGL12-08);中国地质调查局项目(GZH201400202、1212010611302);国家高技术研究发展计划(“863”计划)项目(2009AA09A201-05)~~

摘　　要：南海和印度洋共87 个海底热流测量站位的探针偏角分布表明: 海底热流测量过程中, 探针插入海底沉积物后通常都存在偏角, 其偏角在0°~10°的占48.3%, 10°~20°的占20.7%, 20°~30°的占2.3%, 30°~40°的占2.3%, 超过40°的占26.3%。当用探针偏角较大时, 必然会给地热参数计算带来不容忽视的相对误差。因此, 文章建立探针偏角与地温梯度和热流相对误差之间的定量关系式, 并据此计算得知: 探针偏角<10°时, 对地热参数测量影响不大, 其相对误差只在2.0%以内; 而当探针偏角增大到15°~20°时, 地热参数相对误差则增大到5.0%左右, 且随着探针偏角逐渐增大, 引起的相对误差呈非线性迅速增大。因此, 建议今后进行海底热流测量过程中, 尽可能获取探针插入海底沉积物时的偏角, 进而可对地温梯度和热流进行偏角校正, 获得更为准确的地热参数。It is well known that probe tilt is one of error sources of seafloor heat flow measurements. And the error can neverbe neglected when the probe tilt becomes greater. Recently, we found that the probe tilts were more than 10° at over half of the87 seafloor heat flow measurement stations in the South China Sea and the Indian Ocean, where the probe tilts were recorded simultaneously. Thus, we obtained a quantitative relationship between probe tilt and the errors of thermal gradient and heatflow. Based on this relationship, we learned that the relative error, which is within 2%, can be neglected when the probe tilt iswithin 10 degrees. But at terrible operation conditions, especially the bad state of the sea, the tilt is perhaps up to 15~20degrees, the relative error can be up to about 5%, and will increase nonlinearly and swiftly with probe tilt. We suggest that theinclinometer should be attached when we carry out seafloor heat flow measurements. Then, we should make tilt correction forthe seafloor thermal gradient and heat flow if possible.

关 键 词：海底热流 地温梯度 探针偏角 相对误差 南海 印度洋 

分 类 号：P716.8[天文地球—海洋科学] P738.6