T. J. Hoar
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View article: Ensemble streamflow data assimilation using WRF-Hydro and DART: novel localization and inflation techniques applied to Hurricane Florence flooding
Ensemble streamflow data assimilation using WRF-Hydro and DART: novel localization and inflation techniques applied to Hurricane Florence flooding Open
Predicting major floods during extreme rainfall events remains an important challenge. Rapid changes in flows over short timescales, combined with multiple sources of model error, makes it difficult to accurately simulate intense floods. T…
View article: CLM5-DART Regional Carbon Fluxes and Stocks over the Western US, 1998-2010
CLM5-DART Regional Carbon Fluxes and Stocks over the Western US, 1998-2010 Open
This dataset provides monthly estimates of biomass stocks and land-atmosphere carbon exchange across the western United States at 0.95 degrees longitude x 1.25 degrees latitude grid resolution from 1998 through 2010. The data include outpu…
View article: Improving CLM5.0 Biomass and Carbon Exchange Across the Western United States Using a Data Assimilation System
Improving CLM5.0 Biomass and Carbon Exchange Across the Western United States Using a Data Assimilation System Open
The Western United States is dominated by natural lands that play a critical role for carbon balance, water quality, and timber reserves. This region is also particularly vulnerable to forest mortality from drought, insect attack, and wild…
View article: Comment on hess-2020-642
Comment on hess-2020-642 Open
Abstract. Predicting major floods during extreme rainfall events remains an important challenge. Rapid changes in flows over short timescales, combined with multiple sources of model error, makes it difficult to accurately simulate intense…
View article: Ensemble Streamflow Data Assimilation using WRF-Hydro and DART: Hurricane Florence Flooding
Ensemble Streamflow Data Assimilation using WRF-Hydro and DART: Hurricane Florence Flooding Open
Predicting major floods during extreme rainfall events remains an important challenge. Rapid changes in flows over short time-scales combined with multiple sources of model error makes it difficult to accurately simulate intense floods. Th…
View article: A New CAM6+DART Reanalysis with Surface Forcing from CAM6 to Other CESM Models
A New CAM6+DART Reanalysis with Surface Forcing from CAM6 to Other CESM Models Open
An ensemble Kalman filter reanalysis has been archived in the Research Data Archive at the National Center for Atmospheric Research. It used a CAM6 configuration of the Community Earth System Model (CESM), several million observations per …
View article: Estimating parameters in a sea ice model using an ensemble Kalman filter
Estimating parameters in a sea ice model using an ensemble Kalman filter Open
Uncertain or inaccurate parameters in sea ice models influence seasonal predictions and climate change projections in terms of both mean and trend. We explore the feasibility and benefits of applying an ensemble Kalman filter (EnKF) to est…
View article: Estimating parameters in a sea ice model using an ensemble Kalman filter
Estimating parameters in a sea ice model using an ensemble Kalman filter Open
All data are in netcdf format.
View article: An EnOI‐Based Data Assimilation System With DART for a High‐Resolution Version of the CESM2 Ocean Component
An EnOI‐Based Data Assimilation System With DART for a High‐Resolution Version of the CESM2 Ocean Component Open
An ensemble optimal interpolation (EnOI) data assimilation system for a high‐resolution (0.1° horizontal) version of the Community Earth System Model Version 2 (CESM2) ocean component is presented. For this purpose, a new version of the Da…
View article: Regional and basin scale applications of ensemble adjustment Kalman filter and 4D-Var ocean data assimilation systems
Regional and basin scale applications of ensemble adjustment Kalman filter and 4D-Var ocean data assimilation systems Open
The performance of two common approaches to data assimilation, an Ensemble Adjustment Kalman Filter (EAKF) and a 4-dimensional variational (4D-Var) method, is quantified in a popular community ocean model, the Regional Ocean Modeling Syste…
View article: Estimating Parameters in a Sea Ice Model using an Ensemble Kalman Filter
Estimating Parameters in a Sea Ice Model using an Ensemble Kalman Filter Open
Uncertain or inaccurate parameters in sea ice models influence seasonal predictions and climate change projections in terms of both mean and trend. We explore the feasibility and benefits of applying an Ensemble Kalman filter (EnKF) to est…
View article: Ensemble Streamflow Assimilation with Coupled WRF-Hydro and DART
Ensemble Streamflow Assimilation with Coupled WRF-Hydro and DART Open
<p>The Data Assimilation Research Testbed (DART) has been coupled with the community WRF-Hydro modeling system with the intent of providing efficient and flexible support for assimilating a wide range of streamflow and soil moisture …
View article: The Data Assimilation Research Testbed: Nonlinear Algorithms and Novel Applications for Community Ensemble Data Assimilation
The Data Assimilation Research Testbed: Nonlinear Algorithms and Novel Applications for Community Ensemble Data Assimilation Open
<p>The Data Assimilation Research Testbed (DART) is a community facility for ensemble data assimilation developed and maintained by the National Center for Atmospheric Research (NCAR). DART provides ensemble data assimilation capabil…
View article: Results from An Ensemble Reanalysis with the Community Earth System Model 2.1
Results from An Ensemble Reanalysis with the Community Earth System Model 2.1 Open
<p>The National Center for Atmospheric Research (NCAR) has recently released version 2.1 of the Community Earth System Model (CESM 2.1). A twenty-year, 80-member ensemble atmospheric reanalysis with 1-degree resolution in the CAM6 at…
View article: Evaluation of a Data Assimilation System for Land Surface Models Using CLM4.5
Evaluation of a Data Assimilation System for Land Surface Models Using CLM4.5 Open
The magnitude and persistence of land carbon (C) pools influence long‐term climate feedbacks. Interactive ecological processes influence land C pools and our understanding of these processes is imperfect so land surface models have errors …
View article: OSSE for a sustainable marine observing network in the Sea of Marmara
OSSE for a sustainable marine observing network in the Sea of Marmara Open
An observing system simulation experiment (OSSE) is presented in the Sea of Marmara. A high-resolution ocean circulation model (FESOM) and an ensemble data assimilation tool (DART) are coupled. The OSSE methodology is used to assess the po…
View article: Insights on Sea Ice Data Assimilation from Perfect Model Observing System Simulation Experiments
Insights on Sea Ice Data Assimilation from Perfect Model Observing System Simulation Experiments Open
Simulating Arctic sea ice conditions up to the present and predicting them several months in advance has high stakeholder value, yet remains challenging. Advanced data assimilation (DA) methods combine real observations with model forecast…
View article: A global coupled ensemble data assimilation system using the Community Earth System Model and the Data Assimilation Research Testbed
A global coupled ensemble data assimilation system using the Community Earth System Model and the Data Assimilation Research Testbed Open
This paper presents a description of the CESM/DART ensemble coupled data assimilation (DA) system based on the Community Earth System Model (CESM) and the Data Assimilation Research Testbed (DART) assimilation software. The CESM/DART shoul…
View article: OSSE for a sustainable marine observing network in theMarmara Sea
OSSE for a sustainable marine observing network in theMarmara Sea Open
An observing system simulation experiment (OSSE) is presented in the Marmara Sea. A high resolution ocean circulation model (FESOM) and an ensemble data assimilation tool (DART) are coupled. The OSSE methodology is used to assess the possi…
View article: Observing System Simulation Experiments in the Marmara Sea
Observing System Simulation Experiments in the Marmara Sea Open
Poster presented in Symposium for the legacy of Anna Trevisan in Bologna in Oct 2017
View article: Evaluation of a cosmic-ray neutron sensor network for improved land surface model prediction
Evaluation of a cosmic-ray neutron sensor network for improved land surface model prediction Open
In situ soil moisture sensors provide highly accurate but very local soil moisture measurements, while remotely sensed soil moisture is strongly affected by vegetation and surface roughness. In contrast, cosmic-ray neutron sensors (CRNSs) …
View article: Evaluating the value of a network of cosmic-ray probes for improving land surface modelling
Evaluating the value of a network of cosmic-ray probes for improving land surface modelling Open
Land surface models can model matter and energy fluxes between the land surface and atmosphere, and provide a lower boundary condition to atmospheric circulation models. For these applications, accurate soil moisture quantification is high…
View article: Development of the Ensemble Navy Aerosol Analysis Prediction System (ENAAPS) and its application of the Data Assimilation Research Testbed (DART) in support of aerosol forecasting
Development of the Ensemble Navy Aerosol Analysis Prediction System (ENAAPS) and its application of the Data Assimilation Research Testbed (DART) in support of aerosol forecasting Open
An ensemble-based forecast and data assimilation system has been developed for use in Navy aerosol forecasting. The system makes use of an ensemble of the Navy Aerosol Analysis Prediction System (ENAAPS) at 1 × 1°, combined with an ensembl…
View article: Ionospheric data assimilation and forecasting during storms
Ionospheric data assimilation and forecasting during storms Open
Ionospheric storms can have important effects on radio communications and navigation systems. Storm time ionospheric predictions have the potential to form part of effective mitigation strategies to these problems. Ionospheric storms are c…
View article: An Ensemble of Atmospheric Forcing Files from a CAM reanalysis
An Ensemble of Atmospheric Forcing Files from a CAM reanalysis Open
This dataset contains files that are an ensemble of 'coupler history' files from an 80-member reanalysis performed with the Data Assimilation Research Testbed (DART) using the Community Atmosphere Model Version 4 with the finite volume cor…
View article: Development of the Ensemble Navy Aerosol Analysis Prediction System (ENAAPS) and its application of the Data Assimilation Research Testbed (DART) in support of aerosol forecasting
Development of the Ensemble Navy Aerosol Analysis Prediction System (ENAAPS) and its application of the Data Assimilation Research Testbed (DART) in support of aerosol forecasting Open
An ensemble-based forecast and data assimilation system has been developed for use in Navy aerosol forecasting. The system makes use of an ensemble of the Navy Aerosol Analysis Prediction System (ENAAPS) at 1° × 1°, combined with an Ensemb…