The new CNES-CLS18 Global Mean Dynamic Topography

The new CNES-CLS18 Global Mean Dynamic Topography
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新的 CNES-CLS18 全球平均动态地形

DOI:
10.5194/os-17-789-2021
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发表时间:
2021
期刊:
影响因子:
3.2
通讯作者:
P. Strub
P. Strub
中科院分区:
地球科学2区
文献类型:
--
作者:
S. Mulet;M. Rio;H. Etienne;Camilia Artana;M. Cancet;G. Dibarboure;Hui Feng;R. Husson;N. Picot;C. Provost;P. Strub

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抽象的。平均动态地形(MDT)是测高的重要参考面。它是计算海洋绝对动力地形和在地转近似下估算表面流所必需的。CNES-CLS平均动态地形解是通过合并高度计数据、GRACE和GOCE重力场和海洋学现场测量(漂流浮标速度、水文剖面)的信息计算出来的。本文的目的是介绍最新更新的CNES-CLS 18 MDT。与之前的CNES-CLS 13解决方案相比,主要改进是使用更新的输入数据集:GOCO 05 S大地水准面模型是根据GOCE的完整使命来使用的(2009年11月至2013年10月)和10.5年的GRACE数据,连同所有漂流浮标的速度(SVP型和Argo浮标)和水文剖面(CORA数据库),可从1993-2017年(而不是1993-2012年)获得。新的解决方案还受益于改进的数据处理-特别是一个新的风力驱动的电流模型已被开发,以提取从浮标速度的地转分量;和方法-特别是计算中尺度GOCE为基础的MDT初步猜测和相关尺度用于多变量映射已被修改。与以前的版本和其他现有MDT相比,新解决方案的评估显示在强海流和沿海地区都有显着改善。
Abstract. The Mean Dynamic Topography (MDT) is a key reference surface for altimetry. It is needed for the calculation of the ocean absolute dynamic topography, and under the geostrophic approximation, the estimation of surface currents. CNES-CLS Mean Dynamic Topography (MDT) solutions are calculated by merging information from altimeter data, GRACE and GOCE gravity field and oceanographic in-situ measurements (drifting buoy velocities, hydrological profiles). The objective of this paper is to present the newly updated CNES-CLS18 MDT. The main improvement compared to the previous CNES-CLS13 solution is the use of updated input datasets: the GOCO05S geoid model is used based on the complete GOCE mission (November 2009–October 2013) and 10.5 years of GRACE data, together with all drifting buoy velocities (SVP-type and Argo floats) and hydrological profiles (CORA database) available from 1993–2017 (instead of 1993–2012). The new solution also benefits from improved data processing – in particular a new wind-driven current model has been developed to extract the geostrophic component from the buoy velocities; and methodology – in particular the computation of the medium scale GOCE-based MDT first guess and the correlation scales used for the multivariate mapping have been revised. An evaluation of the new solution compared to the previous version and to other existing MDT show significant improvements both in strong currents and coastal areas.
DOI: 10.1007/s10712-016-9406-y
发表时间: 2017-01
影响因子: 4.6
作者:
T. Fecher;R. Pail;T. Gruber;the Goco Consortium
通讯作者: T. Fecher;R. Pail;T. Gruber;the Goco Consortium