长周期海洋磁场变化的卫星监测。

IF 4.3 3区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences Pub Date : 2024-12-23 Epub Date: 2024-12-02 DOI:10.1098/rsta.2024.0077
Christopher C Finlay, Jakub Velímský, Clemens Kloss, Rasmus M Blangsbøll
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引用次数: 0

摘要

卫星磁场观测有可能提供关于整个海洋的动力学、热含量和盐度的宝贵信息。在此,我们给出了在卫星高度的海洋感应磁场(OIMF)在几个月到几十年周期内的预期时空特征。我们将这些与地球磁场其他来源的特征进行比较,并讨论从太空检索和常规监测OIMF是否可行。我们专注于大长度尺度(球面谐波度高达30)和周期从一个月到5年。为了描述期望的海洋信号,我们利用先进的数值模拟,采用高分辨率的海洋输入,求解三维磁感应方程,包括电偶耦合和自感效应。我们发现时变的海洋感应信号在高球谐度上优于内部场的主要源,即核心发电机,根据所考虑的周期,交叉发生在13-19度。电离层和磁层磁场(包括地球感应的磁场)在短于一个月的周期内能量最大,预计在卫星高度的磁坐标上主要是纬向的。基于这些发现,我们讨论了利用现有和即将到来的磁测卫星收集的数据分离和监测长周期OIMF变化的未来前景。这篇文章是主题“地球和行星海洋的磁测遥感”的一部分。
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Satellite monitoring of long period ocean-induced magnetic field variations.

Satellite magnetic field observations have the potential to provide valuable information on dynamics, heat content and salinity throughout the ocean. Here, we present the expected spatio-temporal characteristics of the ocean-induced magnetic field (OIMF) at satellite altitude on periods of months to decades. We compare these to the characteristics of other sources of Earth's magnetic field, and discuss whether it is feasible for the OIMF to be retrieved and routinely monitored from space. We focus on large length scales (spherical harmonic degrees up to 30) and periods from one month up to 5 years. To characterize the expected ocean signal, we make use of advanced numerical simulations taking high-resolution oceanographic inputs and solve the magnetic induction equation in three dimensions, including galvanic coupling and self-induction effects. We find the time-varying ocean-induced signal dominates over the primary source of the internal field, the core dynamo, at high spherical harmonic degree with the cross-over taking place at degrees 13-19 depending on the considered period. The ionospheric and magnetospheric fields (including their Earth-induced counterparts) have most power on periods shorter than one month and are expected to be mostly zonal in magnetic coordinates at satellite altitude. Based on these findings, we discuss future prospects for isolating and monitoring long period OIMF variations using data collected by present and upcoming magnetic survey satellites.This article is part of the theme issue 'Magnetometric remote sensing of Earth and planetary oceans'.

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来源期刊
CiteScore
9.30
自引率
2.00%
发文量
367
审稿时长
3 months
期刊介绍: Continuing its long history of influential scientific publishing, Philosophical Transactions A publishes high-quality theme issues on topics of current importance and general interest within the physical, mathematical and engineering sciences, guest-edited by leading authorities and comprising new research, reviews and opinions from prominent researchers.
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