Determining Large Scale Tendency Terms for the Navy Over-Water Local Atmospheric Prediction System (NOWLAPS)

摘要

A manual method for calculating large scale tendency (LST) terms for the Navy Over-Water local Atmospheric Prediction System (NOWLAPS) is adapted from an automated, central-site method utilizing forecast fields from the Navy Operational Global Atmospheric Prediction System (NOGAPS). This report descrives the design and use of the LST terms, and compares NOWLAPS predictions for an oceanic weather station ship to those of the Navy Operational Local Atmospheric Prediction System (NOLAPS) and persistence. NOWLAPS, a one-dimensional planetary layer (PBL)model, is designed primarily for shipboard use and was adapted to the Hewlett-Packard 9845 computer under a previous contract. Although it can be run as a single-station PBL forecast model, NOWLAPS can not be a competitive forecast tool until horizontal advection is included or parameterized. Keywords: Marine atomospjere models; Boundary layer modeling.