地中海大地水准面 GeoMed2:正在进行的工作

IF 2.1 4区 综合性期刊 Q2 MULTIDISCIPLINARY SCIENCES
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引用次数: 0

摘要

摘 要 大地测量可在重力和测高相结合的基础上提供有价值的海流估算信息。重力通常用于估算大地水准面的起伏,即大地水准面在给定参考椭球面上的高度。众所周知,海洋上的大地水准面起伏与平均海平面(MSS)密切相关,在全球范围内差异可达 1-2 米。通过卫星测高可以获得平均海面(MSS),然后根据平均海面与大地水准面起伏的差值估算出平均动态地形(MDT)。由于 MDT 与海洋环流有关,因此可以利用这些大地测量法提供海洋环流信息,以便与海洋学估算进行比较。在这种情况下,GeoMed2 项目旨在根据陆地和海洋重力数据以及最近的全球位势模型,为地中海估算一个高精度和高分辨率的大地水准面模型。本文介绍了基于著名的去除-计算-恢复方法的处理方法,用于确定地中海地区的大地水准面。在预处理步骤中,收集、验证、同质化和统一了大地中海盆地的所有可用重力观测数据的水平和重力系统。这样,一个用于确定大地水准面的可靠重力数据库就建立起来了。该数据集被用于计算重力大地水准面估算值,并在此基础上获得地中海上空的 MDT。然后对计算结果进行了修订和评论,并与其他现有的 MDT 解决方案进行了比较。通过这些比较,可以得出结论,大地测量计算出的 MDT 还不能令人满意,因为它的噪声太大。这可能是由于用于估算大地水准面起伏的重力数据仍存在一些不一致之处,以及所采用的 MSS 在地中海地区似乎过于平滑。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
GeoMed2,the geoid of the Mediterranean: work in progress

Abstract

Geodesy can provide valuable information on marine current estimation based on the combination of gravity and altimetry. Gravity is standardly used to estimate the geoid undulation, i.e. the height of the geoid over a given reference ellipsoid. As it is well known, the geoid undulation over the oceans is closely related to the Mean Sea Surface (MSS) with discrepancies that can reach 1–2 m at global scale. By satellite altimetry, one can get the MSS and then estimate the Mean Dynamic Topography (MDT) as the difference between the MSS and the geoid undulation. As the MDT is related to the ocean circulation, information on the ocean circulation to be compared with oceanographic estimates can be provided using these geodetic measurements. In this context, the GeoMed2 project aims at estimating a high-accuracy and high-resolution geoid model for the Mediterranean Sea based on land and marine gravity data and on recent Global Geopotential Models. In this paper, the processing methodology based on the well-known remove–compute–restore approach for the determination of the geoid in the Mediterranean area is presented. In a pre-processing step, all available gravity observations for the wider Mediterranean basin have been collected, validated, homogenized, and unified in terms of their horizontal and gravity system. In this way, a reliable gravity database to be used for the determination of the geoid has been prepared. This data set has been used in computing a gravimetric geoid estimate based on which the MDT over the Mediterranean Sea was obtained. The results of this computation were then revised, commented and compared with other existing MDT solutions. By these comparisons, it can be concluded that the geodetic computed MDT is not yet satisfactory since it is too noisy. This is possibly due to some inconsistencies still present in the gravity data used for estimating the geoid undulation and to the adopted MSS which seems to be too smooth over the Mediterranean area.

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来源期刊
Rendiconti Lincei-Scienze Fisiche E Naturali
Rendiconti Lincei-Scienze Fisiche E Naturali MULTIDISCIPLINARY SCIENCES-
CiteScore
4.10
自引率
10.00%
发文量
70
审稿时长
>12 weeks
期刊介绍: Rendiconti is the interdisciplinary scientific journal of the Accademia dei Lincei, the Italian National Academy, situated in Rome, which publishes original articles in the fi elds of geosciences, envi ronmental sciences, and biological and biomedi cal sciences. Particular interest is accorded to papers dealing with modern trends in the natural sciences, with interdisciplinary relationships and with the roots and historical development of these disciplines.
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