【目的】通过验证Aquarius海表盐度遥感产品数据在不同大洋和波束的反演精度,为其应用提供依据。【方法】基于自沉浮式剖面探测浮标Argo（Array for real-time geostrophic oceanography）盐度观测数据评估Aquarius卫星在重点海域（太...【目的】通过验证Aquarius海表盐度遥感产品数据在不同大洋和波束的反演精度,为其应用提供依据。【方法】基于自沉浮式剖面探测浮标Argo（Array for real-time geostrophic oceanography）盐度观测数据评估Aquarius卫星在重点海域（太平洋、大西洋、印度洋）和不同波束对应的海表盐度产品精度。【结果】相对于波束2和波束3,波束1海表盐度与Argo观测最为接近,偏差和均方根差分别为0.003psu和0.397psu。与大西洋和印度洋相比,太平洋反演精度最高。在中纬度地区,盐度偏差较小,约为0.1psu;在南北纬20°和高纬度区域,盐度偏差较大,约为0.2psu;低海温和高风速对盐度误差也有重要贡献,低海温对应的弱亮温信号和高风速下的不准确的海面粗糙度模型是导致盐度偏差的主要因素。此外,利用Argo月平均海表盐度观测数据评估了Aquarius卫星海表盐度三级产品,均方根差在0.27∽0.34psu之间,平均值为0.31psu。在二级和三级产品中,V3.0SSS_bias_adj的均方根差相比V3.0SSS均降低约0.04psu。【结论】与V2.0数据产品相比,V3.0二级产品精度有了的较大提高,三级产品无明显改善,升轨和降轨的偏差依然存在。海表温度校正能够提高盐度反演的精度,使得均方根误差下降0.04psu。展开更多
A two-dimensioual stress analysis was developed to evaluate the failure of composite joints using characteristic length method. In this study, the accuracy of characteristic length method on the prediction of failure ...A two-dimensioual stress analysis was developed to evaluate the failure of composite joints using characteristic length method. In this study, the accuracy of characteristic length method on the prediction of failure strength and failure mode using different failure criteria was investigated. The stresses required for evaluating the joints were computed from stress functions obtained from displacement expressions that satisfy boundary conditions of the hole. The available experimental data for joint strength in literature were compared with the predicted failure loads and modes of failure for different composite pinned joints. No single failure criterion utilized to evaluate the failure gave a universally best fit across the three joints evaluated. However, the accuracy of characterizing the joints failure varies with joint laminate and choice of failure criterions.展开更多
文摘【目的】通过验证Aquarius海表盐度遥感产品数据在不同大洋和波束的反演精度,为其应用提供依据。【方法】基于自沉浮式剖面探测浮标Argo（Array for real-time geostrophic oceanography）盐度观测数据评估Aquarius卫星在重点海域（太平洋、大西洋、印度洋）和不同波束对应的海表盐度产品精度。【结果】相对于波束2和波束3,波束1海表盐度与Argo观测最为接近,偏差和均方根差分别为0.003psu和0.397psu。与大西洋和印度洋相比,太平洋反演精度最高。在中纬度地区,盐度偏差较小,约为0.1psu;在南北纬20°和高纬度区域,盐度偏差较大,约为0.2psu;低海温和高风速对盐度误差也有重要贡献,低海温对应的弱亮温信号和高风速下的不准确的海面粗糙度模型是导致盐度偏差的主要因素。此外,利用Argo月平均海表盐度观测数据评估了Aquarius卫星海表盐度三级产品,均方根差在0.27∽0.34psu之间,平均值为0.31psu。在二级和三级产品中,V3.0SSS_bias_adj的均方根差相比V3.0SSS均降低约0.04psu。【结论】与V2.0数据产品相比,V3.0二级产品精度有了的较大提高,三级产品无明显改善,升轨和降轨的偏差依然存在。海表温度校正能够提高盐度反演的精度,使得均方根误差下降0.04psu。
文摘A two-dimensioual stress analysis was developed to evaluate the failure of composite joints using characteristic length method. In this study, the accuracy of characteristic length method on the prediction of failure strength and failure mode using different failure criteria was investigated. The stresses required for evaluating the joints were computed from stress functions obtained from displacement expressions that satisfy boundary conditions of the hole. The available experimental data for joint strength in literature were compared with the predicted failure loads and modes of failure for different composite pinned joints. No single failure criterion utilized to evaluate the failure gave a universally best fit across the three joints evaluated. However, the accuracy of characterizing the joints failure varies with joint laminate and choice of failure criterions.
