气候变化领域集成服务门户(CCPortal): Ocean Surface Currents Reconstruction: Spectral Characterization of the Transfer Function Between SST and SSH

CCPortal

DOI	10.1029/2019JC015958
	Ocean Surface Currents Reconstruction: Spectral Characterization of the Transfer Function Between SST and SSH
	González-Haro C.; Isern-Fontanet J.; Tandeo P.; Garello R.
发表日期	2020
ISSN	21699275
卷号	125 期号:10
英文摘要	Knowledge of ocean surface current at high resolutions is crucial for many applications. In addition to the classic satellite altimetry retrieval from sea surface height (SSH), ocean surface currents can be retrieved from sea surface temperature (SST) observations using a transfer function between SST and SSH. Previous works showed the potential of microwave SST observations to reconstruct ocean surface currents using a synergistic approach: an optimal transfer function that combines the phase of SST with the SSH amplitude spectra. This synergistic approach revealed that surface quasi geostrophy (SQG) reconstruction can be enhanced and opened up the possibility to improve spatial resolution of ocean currents retrieved from altimeters observations if infrared SST observations are considered. However, before applying this synergistic approach to satellite observations, we need to analyze and characterize the spectral properties of the transfer function. This spectral characterization of the transfer function allows to exploit the synergy between SST and SSH observations that have different measurement topology and different spatial resolution. Here, we performed a feasibility study using the daily outputs of the operational Mercator global analysis and forecast system at (1/12)° in the western coast of Australia (27–35°S, 107–113°E) spanning from 26 November 2012 to 26 November 2016. Results showed that the mean transfer function in this region presents two well different bands: one characterized by a negative slope slightly steeper (α = −1.2) than the k−1 predicted by the SQG solution for scales smaller than 270 km and another characterized by a plateau for wavelengths larger than 270 km. In addition, the results revealed that the inhomogeneity in dynamics of the flow limits global solutions. Finally, we showed that information contained along the track is enough for a synoptic reconstruction of the flow in this region, which shows the feasibility of applying this methodology to real satellite observations. ©2020. The Authors.
英文关键词	improve spatial resolution; ocean surface reconstruction; SSH; SST; synergy; transfer function
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186641
作者单位	Lab-STICC, UMR CNRS 6285, IMT Atlantique, Plouzané, France; Department of Physical and Technological Oceanography, Barcelona Expert Center in Remote Sensing, Institut de Ciències del Mar (CSIC), Barcelona, Spain
推荐引用方式 GB/T 7714	González-Haro C.,Isern-Fontanet J.,Tandeo P.,et al. Ocean Surface Currents Reconstruction: Spectral Characterization of the Transfer Function Between SST and SSH[J],2020,125(10).
APA	González-Haro C.,Isern-Fontanet J.,Tandeo P.,&Garello R..(2020).Ocean Surface Currents Reconstruction: Spectral Characterization of the Transfer Function Between SST and SSH.Journal of Geophysical Research: Oceans,125(10).
MLA	González-Haro C.,et al."Ocean Surface Currents Reconstruction: Spectral Characterization of the Transfer Function Between SST and SSH".Journal of Geophysical Research: Oceans 125.10(2020).