Surface manifestation characteristics of internal solitary waves observed by GCOM-C/SGLI imagery

IF 2.1 4区 地球科学 Q2 MARINE & FRESHWATER BIOLOGY Journal of Sea Research Pub Date : 2024-09-05 DOI:10.1016/j.seares.2024.102541
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Abstract

Internal waves are easily recognized features of remote sensing images. They occur below the sea surface and can be observed using optical and radar sensors due to their interactions with surface waves. Nonlinear internal waves, known as Internal Solitary Waves (ISW), maintain their coherence and visibility through nonlinear hydrodynamics and appear as long quasilinear stripes in images. Optical sensors can capture changes in sea surface roughness modulated by ISW when their location is close to specular reflection from the sun. Optical imagery with wide area coverage and high temporal resolution has the potential to track and analyze ISW dynamics. However, a comprehensive analysis of the mechanisms underlying ISW manifestation patterns in optical images is necessary. The GCOM-C/SGLI satellite, equipped with a visible-near infrared radiometer and an infrared scanner, provides a detailed view of ISW manifestations using various scanning techniques. By analyzing SGLI products that detect ISW patterns, this study investigated how these waves manifest on the sea surface. The comparison between Level-1B data and Level-2 Ocean products observed by the SGLI sensor reveals that ISW patterns significantly affect ocean color parameters and thermal channel data. The consistent ISW manifestation pattern detected in TOA radiance and ocean color products suggests that ISWs impact sea surface roughness. Additionally, the detection of ISW patterns in SST data is a notable finding, highlighting the potential influence of ISWs on air-sea interactions and the atmospheric boundary layer. Understanding these impacts is crucial for remote sensing applications, particularly for long-term internal wave monitoring and ensuring that smaller-scale internal wave signals do not interfere with large-scale satellite estimations of ocean color.

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通过 GCOM-C/SGLI 图像观测到的内孤波表面表现特征
内波是遥感图像中很容易识别的特征。它们发生在海面以下,由于与表面波的相互作用,可以通过光学和雷达传感器观测到。非线性内波被称为内部孤波(ISW),通过非线性流体力学保持其连贯性和可见性,在图像中表现为长的类线性条纹。当光学传感器的位置接近太阳的镜面反射时,就能捕捉到由 ISW 调制的海面粗糙度变化。覆盖面积广、时间分辨率高的光学图像具有跟踪和分析 ISW 动态的潜力。然而,有必要对光学图像中 ISW 表现模式的内在机制进行全面分析。GCOM-C/SGLI 卫星配备了可见光-近红外辐射计和红外扫描仪,可利用各种扫描技术详细查看 ISW 的表现形式。通过分析检测 ISW 模式的 SGLI 产品,本研究调查了这些波在海面上的表现形式。通过比较 SGLI 传感器观测到的 Level-1B 数据和 Level-2 海洋产品,发现 ISW 模式对海洋颜色参数和热通道数据有显著影响。在 TOA 辐射率和海洋颜色产品中检测到的一致的 ISW 表现模式表明,ISW 会影响海面粗糙度。此外,在 SST 数据中检测到 ISW 模式也是一个值得注意的发现,它突出了 ISW 对海气相互作用和大气边界层的潜在影响。了解这些影响对于遥感应用,特别是长期内波监测和确保较小尺度内波信号不干扰大尺度卫星对海洋颜色的估计至关重要。
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来源期刊
Journal of Sea Research
Journal of Sea Research 地学-海洋学
CiteScore
3.20
自引率
5.00%
发文量
86
审稿时长
6-12 weeks
期刊介绍: The Journal of Sea Research is an international and multidisciplinary periodical on marine research, with an emphasis on the functioning of marine ecosystems in coastal and shelf seas, including intertidal, estuarine and brackish environments. As several subdisciplines add to this aim, manuscripts are welcome from the fields of marine biology, marine chemistry, marine sedimentology and physical oceanography, provided they add to the understanding of ecosystem processes.
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