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RISA Study of Impacts of Coupled Model Initial Shocks and State–Parameter Optimization on Climate Predictions Using a Simple Pycnocline Prediction Model
Publisher: American Meteorological Society
Abstract: skillful decadal prediction that foretells varying regional climate conditions over seasonal?interannual to multidecadal time scales is of societal significance. However, predictions initialized from the climate-observing ...
An Inflated Ensemble Filter for Ocean Data Assimilation with a Biased Coupled GCM
Publisher: American Meteorological Society
Abstract: A ?biased twin? experiment using two coupled general circulation models (CGCMs) that are biased with respect to each other is used to study the impact of deep ocean bias on ensemble ocean data assimilation. The ?observations? ...
The Adequacy of Observing Systems in Monitoring the Atlantic Meridional Overturning Circulation and North Atlantic Climate
Publisher: American Meteorological Society
Abstract: The Atlantic meridional overturning circulation (AMOC) has an important influence on climate, and yet adequate observations of this circulation are lacking. Here, the authors assess the adequacy of past and current widely ...
Examination of Numerical Results from Tangent Linear and Adjoint of Discontinuous Nonlinear Models
Publisher: American Meteorological Society
Abstract: The forward model solution and its functional (e.g., the cost function in 4DVAR) are discontinuous with respect to the model's control variables if the model contains discontinuous physical processes that occur during the ...
Bridge Real-Time Damage Identification Method Using Inclination and Strain Measurements in the Presence of Temperature Variation
Publisher: American Society of Civil Engineers
Abstract: In this paper, a new real-time damage identification method has been presented for bridge structural health monitoring (SHM) considering temperature variation. The method utilizes model-based damage identification that ...
Balanced and Coherent Climate Estimation by Combining Data with a Biased Coupled Model
Publisher: American Meteorological Society
Abstract: iven a biased coupled model and the atmospheric and oceanic observing system, maintaining a balanced and coherent climate estimation is of critical importance for producing accurate climate analysis and prediction ...
System Design and Evaluation of Coupled Ensemble Data Assimilation for Global Oceanic Climate Studies
Publisher: American Meteorological Society
Abstract: A fully coupled data assimilation (CDA) system, consisting of an ensemble filter applied to the Geophysical Fluid Dynamics Laboratory?s global fully coupled climate model (CM2), has been developed to facilitate the detection ...
Impact of Enthalpy-Based Ensemble Filtering Sea Ice Data Assimilation on Decadal Predictions: Simulation with a Conceptual Pycnocline Prediction Model
Publisher: American Meteorological Society
Abstract: he non-Gaussian probability distribution of sea ice concentration makes it difficult to directly assimilate sea ice observations into a climate model. Because of the strong impact of the atmospheric and oceanic forcing on ...
Influence of Mechanical Properties of Tube on Forming Limits and Deformation Characteristics in an Expansion Drawing Process
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper describes an efficient method of manufacturing thin-walled metal tubes. The proposed method is an expansion drawing and it consists of two stages, flaring and drawing, during which high thickness reduction is ...
Use of Differentiable and Nondifferentiable Optimization Algorithms for Variational Data Assimilation with Discontinuous Cost Functions
Publisher: American Meteorological Society
Abstract: Cost functions formulated in four-dimensional variational data assimilation (4DVAR) are nonsmooth in the presence of discontinuous physical processes (i.e., the presence of ?on?off? switches in NWP models). The adjoint ...