scholarly journals Ocean Dynamics Observed by VIIRS Day/Night Band Satellite Observations

2018 ◽  
Vol 10 (2) ◽  
pp. 76 ◽  
Author(s):  
Wei Shi ◽  
Menghua Wang
Keyword(s):  
Satellite Observations ◽  
Ocean Dynamics

scholarly journals An Objective Method with a Continuity Constraint for Improving Surface Velocity Estimates from the Geostationary Ocean Color Imager

2021 ◽  
Vol 14 (1) ◽  
pp. 14
Author(s):  
Zifeng Hu ◽  
Lan Li ◽  
Jun Zhao ◽  
Dongxiao Wang
Keyword(s):  
Ocean Color ◽  
Relative Magnitude ◽  
Satellite Observations ◽  
Ocean Dynamics ◽  
Surface Velocity ◽  
Objective Method ◽  
State University ◽  
Spatiotemporal Resolution ◽  
Continuity Constraint ◽  
Oregon State University

Mapping surface currents with high spatiotemporal resolution over a wide coverage is crucial for understanding ocean dynamics and associated biogeochemical processes. The most widely used algorithm for estimating surface velocities from sequential satellite observations is the maximum cross-correlation (MCC) method. However, many unrealistic vectors still exist, despite the utilization of various filtering techniques. In this study, an objective method has been developed through the combination of MCC and multivariate optimum interpolation (MOI) analysis under a continuity constraint. The MCC method, with and without MOI, is applied to sequences of simulated sea surface temperature (SST) fields with a 1/48° spatial resolution over the East China Sea continental shelf. Integration of MOI into MCC reduces the average absolute differences between the model’s ‘actual’ velocity and the SST-derived velocity by 19% in relative magnitude and 22% in direction, respectively. Application of the proposed method to Geostationary Ocean Color Imager (GOCI) satellite observations produces good agreement between derived surface velocities and the Oregon State University (OSU) regional tidal model outputs. Our results demonstrate that the incorporation of MOI into MCC can provide a significant improvement in the reliability and accuracy of satellite-derived velocity fields.

scholarly journals Satellite Observations of Wind Wake and Associated Oceanic Thermal Responses: A Case Study of Hainan Island Wind Wake

2019 ◽  
Vol 11 (24) ◽  
pp. 3036 ◽  
Author(s):  
Jin Sha ◽  
Xiao-Ming Li ◽  
Xue’en Chen ◽  
Tianyu Zhang
Keyword(s):  
Heat Flux ◽  
Thermal Evolution ◽  
Hainan Island ◽  
Reanalysis Data ◽  
Satellite Observations ◽  
Ocean Dynamics ◽  
Beibu Gulf ◽  
Heat Advection ◽  
Gulf Of Tonkin

The wind wake on the lee side of Hainan Island in the winter covers the southwest entrance of Beibu Gulf (or Gulf of Tonkin) and is essential to regional ocean dynamics. Using multiple satellite observations including advanced synthetic aperture radar (ASAR), we revisited the wake process during the winter of 2011. Asymmetric oceanic thermal responses were found with a warm band expanding northwestwardly while a cold tongue formed to the southeast. Combining satellite observations, model simulations, and reanalysis data, heat advection terms (ADV) are reconstructed and compared to air-sea heat flux terms. The observed thermal evolution process across the wake footprint is closely related to the balanced spatial variability from the Ekman ADV, the barotropic geostrophic ADV, and the latent heat flux (LHF), which are all on the order of 10−5 K·m·s−1. Specifically, the Ekman ADV tends to heat the northwestern side of the wake and cool the southeastern side, while the geostrophic ADV compensates with the Ekman ADV across the wake footprint. This study reveals detailed oceanic responses associated with the wind wake and clarifies the contribution of ADV to the asymmetric spatial thermal variabilities. The identified role of heat advection on a sub-seasonal timescale may further benefit the understanding of regional oceanic dynamics.

Results of Latitude Observations with the Floating Zenith Telescope at Mizusawa: Comparisons between the Results Obtained from the Astronomical and Doppler Satellite Observations

1975 ◽  
Vol 26 ◽  
pp. 461-468
Author(s):  
S. Takagi
Keyword(s):  
Photographic Plate ◽  
Satellite Observations ◽  
Pole Motion

In this article, we intended to see whether we can obtain the same pole motion from two kinds of telescopes: the floating zenith telescope (PZT) and the ILS zenith telescope (VZT). The observations with the PZT have been pursued since 1967.0 with a star list whose star places are taken from the PK4 and its supplement. We revised the method of reduction of the observations with the PZT by adopting a variable scale value for the photographic plate (Takagi et al., 1974).

Beacon-satellite observations of wave disturbances in the plasma of near-earth space

2004 ◽  
Vol 10 (2-3) ◽  
pp. 16-21
Author(s):  
O.F. Tyrnov ◽  
◽  
Yu.P. Fedorenko ◽  
L.F. Chernogor ◽  
◽  
...  
Keyword(s):  
Satellite Observations ◽  
Earth Space ◽  
Near Earth Space ◽  
Wave Disturbances

Application of satellite observations for assessment of regional hydrological and hydrogeological risks

2011 ◽  
Vol 17 (6) ◽  
pp. 19-29
Author(s):  
Yu.V. Kostyuchenko ◽  
◽  
I.M. Kopachevskyi ◽  
D.M. Solovyov ◽  
M.V. Yushchenko ◽  
...  
Keyword(s):  
Satellite Observations
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