TITLE

Tests of an Adjoint Mesoscale Model with Explicit Moist Physics on the Cloud Scale

AUTHOR(S)
Amerault, Clark; Zou, Xiaolei; Doyle, James
PUB. DATE
June 2008
SOURCE
Monthly Weather Review;Jun2008, Vol. 136 Issue 6, p2120
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
An adjoint modeling system based upon the Naval Research Laboratory’s Coupled Ocean–Atmosphere Mesoscale Prediction System’s atmospheric component has been developed. The system includes the adjoint model of the explicit moist physics parameterization, which allows for gradients with respect to the initial hydrometeor concentrations to be calculated. This work focuses on the ability of the system to calculate evolved perturbations and gradients for the hydrometeor variables. Tests of the tangent linear and adjoint models for an idealized convective case at high model resolution (4-km horizontal grid spacing) are presented in this study. The tangent linear approximation is shown to be acceptable for all model variables (including the hydrometeors) with sizable perturbations for forecasts of 1 h. The adjoint model was utilized with the same convective case to demonstrate its applicability in four-dimensional variational data assimilation experiments. Identical twin experiments were conducted where the adjoint model produced gradients for all model variables, leading to improved analyses and forecasts. The best agreement between model forecasts and simulated observations occurred when information on all model variables was assimilated. In the case where only conventional data were assimilated, the agreement was not as good in the early forecast period. However, the hydrometeor values spun up quickly, and at later times, the forecast performed almost as well as when all data were assimilated.
ACCESSION #
32874777

 

Related Articles

  • Performance of Hourly Operational Consensus Forecasts (OCFs) in the Australian Region. Engel, Chermelle; Ebert, Elizabeth // Weather & Forecasting;Dec2007, Vol. 22 Issue 6, p1345 

    This paper presents an extension of the operational consensus forecast (OCF) method, which performs a statistical correction of model output at sites followed by weighted average consensus on a daily basis. Numerical weather prediction (NWP) model forecasts are received from international...

  • Links Between Weather Phenomena and Characteristics of Refractivity Measured by Precipitation Radar. Besson, Lucas; Boudjabi, Chiraz; Caumont, Olivier; Parent du Chatelet, Jacques // Boundary-Layer Meteorology;Apr2012, Vol. 143 Issue 1, p77 

    Refractivity depends on meteorological parameters such as temperature and water vapour pressure and can be measured using a weather radar. A realistic atmospheric simulation from the Meso-NH numerical model is used in order to describe and establish the relation between refractivity and the...

  • On the Climate Impact of Surface Roughness Anomalies. Kirk-Davidoff, Daniel B.; Keith, David W. // Journal of the Atmospheric Sciences;Jul2008, Vol. 65 Issue 7, p2215 

    Large-scale deployment of wind power may alter climate through alteration of surface roughness. Previous research using GCMs has shown large-scale impacts of surface roughness perturbations but failed to elucidate the dynamic mechanisms that drove the observed responses in surface temperature....

  • A Modified Dynamic Framework for the Atmospheric Spectral Model and Its Application. Tongwen Wu; Rucong Yu; Fang Zhang // Journal of the Atmospheric Sciences;Jul2008, Vol. 65 Issue 7, p2235 

    This paper describes a dynamic framework for an atmospheric general circulation spectral model in which a reference stratified atmospheric temperature and a reference surface pressure are introduced into the governing equations so as to improve the calculation of the pressure gradient force and...

  • Weatherwatch with Helen Willetts. Amodeo, Christian // Geographical (Campion Interactive Publishing);Oct2004, Vol. 76 Issue 10, p15 

    Recalls the severe storm that hit Southern England in October 1987. Damage caused by the storm; Changes in temperature and pressure; Improvement on weather forecasting since 1987; Establishment of the National Severe Weather Warnings Service.

  • An Intelligent Operational Model of Weather Modification in Yunnan Province. Na Zhao; Jian Wang; Peng Li; Wei Du; Jinzhuo Liu; Yunzhi jin // Advanced Materials Research;2014, Issue 886, p509 

    Based on the characteristics of weather modification in Yunnan Province, this paper proposed a weather modification operation model which aims to help operating managers with operating scenario and provide operating spots, fixed or mobile, with detailed intelligent decision-making information,...

  • The Effect of Mesh Resolution on Convective Boundary Layer Statistics and Structures Generated by Large-Eddy Simulation. Sullivan, Peter P.; Patton, Edward G. // Journal of the Atmospheric Sciences;Oct2011, Vol. 68 Issue 10, p2395 

    A massively parallel large-eddy simulation (LES) code for planetary boundary layers (PBLs) that utilizes pseudospectral differencing in horizontal planes and solves an elliptic pressure equation is described. As an application, this code is used to examine the numerical convergence of the...

  • Reference Station Networks for Monitoring Climatic Change in the Conterminous United States. Vose, Russell S. // Journal of Climate;Dec2005, Vol. 18 Issue 24, p5390 

    Set cover models are used to develop two reference station networks that can serve as near-term substitutes (as well as long-term backups) for the recently established Climate Reference Network (CRN) in the United States. The first network contains 135 stations distributed in a relatively...

  • Using Gap-Filling Radars in Mountainous Regions to Complement a National Radar Network: Improvements in Multiple-Doppler Wind Syntheses. Beck, Jeffrey; Bousquet, Olivier // Journal of Applied Meteorology & Climatology;Aug2013, Vol. 52 Issue 8, p1836 

    The existing French Application Radar à la Météorologie Infrasynoptique (ARAMIS) operational radar network covers a vast majority of the country of France, yet like many national networks, gaps in coverage are present in regions of mountainous and high terrain. Many of these areas are...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics