Journal article
Surface Radiative Flux Bias Reduction Through Regionally Varying Cloud Fraction Parameter Nudging in a Global Coupled Forecast System
JA Ridout, NP Barton, MA Janiga, CA Reynolds, JC May, C Rowley, CH Bishop
Journal of Advances in Modeling Earth Systems | AMER GEOPHYSICAL UNION | Published : 2021
DOI: 10.1029/2019MS002006
Abstract
A simple parameter nudging procedure is described that systematically reduces near-analysis time errors in the surface net shortwave flux in the Navy ESPC (Earth System Prediction Capability) system, a global coupled forecast system that is the product of a continuing development effort at the U. S. Naval Research Laboratory. The procedure generates geographically varying perturbations to one of the cloud fraction parameters in the atmospheric model component of the system during the data assimilation cycle, resulting in large improvements in near-analysis time surface net shortwave flux biases. After a several week spin-up period, the global RMSE of the succeeding 10-day mean bias computed ..
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Grants
Awarded by Office of Naval Research
Funding Acknowledgements
This research was sponsored by OPNAV N2N6E and the Office of Naval Research's Earth System Prediction Capability, PE0603207N. The work was supported in part by a grant of computing time from the Department of Defense's (DoD's) High Performance Computing Modernization Program (HPCMP). The helpful comments of two anonymous reviewers are gratefully acknowledged. The CERES data are provided by the NASA Langley Research Center Atmospheric Science Data Center (https://eosweb.larc.nasa.gov/order-data).The Navy ESPC analysis and forecast data are stored at the Navy DoD Supercomputing Resource Center (DSRC). Access to the Navy DSRC may be obtained through a request to the DoD HPCMP (https://www.hpc.mil/).Once an account has been established, the corresponding author may be contacted for information to access the archived data.