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RISUse of an Adjoint Model for Finding Triggers for Alpine Lee Cyclogenesis
Publisher: American Meteorological Society
Abstract: The authors propose a new procedure. designated the adjoint-based genesis diagnostic (AGD) procedure, for studying triggering mechanism and the subsequent genesis of the synoptic phenomena of interest. This procedure makes ...
Importance of Forecast Error Multivariate Correlations in Idealized Assimilations of GPS Radio Occultation Data with the Ensemble Adjustment Filter
Publisher: American Meteorological Society
Abstract: The importance of multivariate forecast error correlations between specific humidity, temperature, and surface pressure in perfect model assimilations of Global Positioning System radio occultation (RO) refractivity data ...
Singular-Vector Perturbation Growth in a Primitive Equation Model with Moist Physics
Publisher: American Meteorological Society
Abstract: Finite-time growth of perturbations in the presence of moist physics (specifically, precipitation) is investigated using singular vectors (SVs) in the context of a primitive equation regional model. Two difficulties appear ...
Medium-Range Ensemble Sensitivity Analysis of Two Extreme Pacific Extratropical Cyclones
Publisher: American Meteorological Society
Abstract: n this study, ensemble sensitivity analysis has been applied to examine the evolution of two extreme extratropical cyclones over the Pacific. Sensitivity using, as forecast metrics, forecast cyclone minimum pressure and ...
The Data Assimilation Research Testbed: A Community Facility
Publisher: American Meteorological Society
Abstract: The Data Assimilation Research Testbed (DART) is an open-source community facility for data assimilation education, research, and development. DART's ensemble data assimilation algorithms, careful software engineering, and ...
Scale-Dependent Representation of the Information Content of Observations in the Global Ensemble Kalman Filter Data Assimilation
Publisher: American Meteorological Society
Abstract: lobal data assimilation systems for numerical weather prediction (NWP) are characterized by significant uncertainties in tropical analysis fields. Furthermore, the largest spread of global ensemble forecasts in the short ...
Can Fully Accounting for Clouds in Data Assimilation Improve Short-Term Forecasts by Global Models?
Publisher: American Meteorological Society
Abstract: This paper explores the degree to which short-term forecasts with global models might be improved if clouds were fully included in a data assimilation system, so that observations of clouds affected all parts of the model ...
Comparing Adaptive Prior and Posterior Inflation for Ensemble Filters Using an Atmospheric General Circulation Model
Publisher: American Meteorological Society
Abstract: AbstractSampling errors and model errors are major drawbacks from which ensemble Kalman filters suffer. Sampling errors arise because of the use of a limited ensemble size, while model errors are deficiencies in the dynamics ...
DART/CAM: An Ensemble Data Assimilation System for CESM Atmospheric Models
Publisher: American Meteorological Society
Abstract: he Community Atmosphere Model (CAM) has been interfaced to the Data Assimilation Research Testbed (DART), a community facility for ensemble data assimilation. This provides a large set of data assimilation tools for climate ...