搜索结果: 1-15 共查到“海洋物理学 estimation”相关记录15条 . 查询时间(0.062 秒)
Efficient estimation of time-mean states of ocean models using 4D-Var and implicit time-stepping
Efficient estimation time-mean states ocean models 4D-Var implicit time-stepping
2009/11/3
We propose an efficient method for estimating a time-mean state of an ocean model subject to given observations using implicit time-stepping. The new method uses (i) an implicit implementation of the ...
Estimation of Meridional Heat Flux in the North Atlantic by Inverse Methods
Meridional Heat Flux North Atlantic Inverse Methods
2009/2/19
Hydrographic sections spanning the Atlantic Ocean at 24, 36 and 48°N are used to make an estimate of meridional heat flux in the ocean. An inverse method provides reference level velocities for geostr...
On the Estimation of Absolute Geostrophic Volume Transport Applied to the Antarctic Circumpolar Current
Absolute Geostrophic Volume Transport Antarctic Circumpolar Current
2009/2/13
An objective method of estimating the geostrophic barotropic volume transport across an oceanographic section is developed and applied to the transport of the Antarctic Circumpolar Current through the...
The Estimation of Wind-Wave Generation in a Discrete Spectral Model
Wind-Wave Generation Discrete Spectral Model
2009/2/9
The estimation of wind-wave generation using a new discrete spectral model is compared to Hasselmann et al.'s (1976) parametric model and to models driven primarily by direct transfer of energy from t...
Estimation of Low-Frequency Wind Stress Fluctuations over the Open Ocean
Low-Frequency Wind Stress Fluctuations Open Ocean
2009/2/5
A simple, approximate formula for mean wind stress is given in terms of the mean and variance of the wind fluctuations over the averaging period. The formula is nonlinear with respect to the mean wind...
An Estimation of Sea-Level and Surface-Current Anomalies during the 1972 El Niño and Consequent Thermal Effects
mean flow anomalous motion tropical region Thermal Effects
2009/2/5
This paper has two main parts. First, it is shown that if the dynamics is simplified by assuming a one-mode, low-frequency (or long-wave) model, the whole field of anomalous motion in the tropical reg...
The Effects of the Variations In Sea Surface Temperature and Atmospheric Stability in the Estimation of Average Wind Speed by SEASAT-SASS
Sea Surface Temperature Atmospheric Stability Average Wind Speed SEASAT-SASS
2009/1/19
Wind speeds from the scatterometer (SASS) on the ocean observing satellite SEASAT averaged over 2° latitude by 2° longitude and a 92-day period are compared with wind speeds from ship reports in the w...
Maximum Entropy Estimation of the Directional Distribution in Ocean Wave Spectra
Maximum Entropy Estimation Directional Distribution Ocean Wave Spectra
2009/1/13
A general maximum entropy estimate for the directional distribution of the directional wave spectrum is introduced. The estimate appears to be superior to conventional methods, including maximum likel...
Estimation and Verification of Tidally Induced Residual Currents
Tidally Induced Residual Currents residual currents Cape Sable area
2009/1/6
Using a multiple regression technique that includes both tidal and wind forcings, the tidally-induced residual current can be estimated from current meter records. However, the estimated mean (long-te...
Estimation of Directional Wave Spectra from Multicomponent Observations
Directional Wave Spectra Multicomponent Observations
2008/12/30
An improved method for estimating the directional spectrum of linear surface gravity waves from in Situ observations is presented. The technique, a refinement and extension of the inverse method of Lo...
Variational Estimation of the Wind Stress Drag Coefficient and the Oceanic Eddy Viscosity Profile
Variational Estimation Oceanic Eddy Viscosity Profile Wind Stress Drag Coefficient
2008/12/23
A variational optimal control technique is used to assimilate both meteorological and oceanographic observations into an oceanic Ekman layer model. An identical twin experiment is discussed first in w...
Directional Wave Spectra Estimation in a Marginal Ice Zone Using Linear Prediction
synthetic aperature radar wave field Marginal Ice Zone
2008/12/22
A synthetic aperature radar (SAR) image of a wave field penetrating a marginal ice zone off Newfoundland was analyzed in order to get insight into the physical processes responsible for the swell atte...
Direct Estimation of Heat Flux in a Seasonal Thermocline
Heat Flux Seasonal Thermocline direct measurement
2008/12/17
This paper reports on a direct measurement of the turbulent heat flux. The sampling was from a submarine that used a conventional airfoil probe to measure the vertical component of turbulent velocity ...
Estimation of Tropical Sea Level Anomaly by an Improved Kalman Filter
Tropical Sea Level Kalman Filter long-wave model
2008/12/10
Kaiman filter theory and autoregressive time series are used to map sea level height anomalies in the tropical Pacific. Our Kalman filters are implemented with a linear state space model consisting of...
On the Estimation of Overwater Bowen Ratio from Sea–Air Temperature Difference
Overwater Bowen Ratio Sea–Air Temperature Difference
2008/7/11
On the basis of thermodynamic considerations, a relationship between overwater Bowen ratio, B, and sea–air temperature difference, (Tsea − Tair), under unstable conditions has been formulated by...