Adjoint-Based Targeting of Observations for Fastex Cyclones
Recent development of adjoint versions of numerical weather prediction models makes possible a number of new diagnostic and interpretive techniques that can be applied to atmospheric forecasting. For example, adjoint models can be used to evaluate conceptual ideas of atmospheric processes, including...
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ftdtic:ADA319126 2023-05-15T17:30:52+02:00 Adjoint-Based Targeting of Observations for Fastex Cyclones Langland, Rolf H. Rohaly, Gregory D. NAVAL RESEARCH LAB MONTEREY CA 1996-09-13 text/html http://www.dtic.mil/docs/citations/ADA319126 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA319126 en eng http://www.dtic.mil/docs/citations/ADA319126 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Meteorology *CYCLOGENESIS VORTICES WEATHER FORECASTING NORTH ATLANTIC OCEAN DIGITAL SIMULATION FRONTS(METEOROLOGY) ADJOINT MODELS FASTEX(FRONTS AND ATLANTIC STORM TRACK EXPERIMENT) PE61153N Text 1996 ftdtic 2016-02-19T19:19:41Z Recent development of adjoint versions of numerical weather prediction models makes possible a number of new diagnostic and interpretive techniques that can be applied to atmospheric forecasting. For example, adjoint models can be used to evaluate conceptual ideas of atmospheric processes, including considerations of potential vorticity and the Charney and Eady problems that relate to extratropical cyclone development (Langland et al. 1995). In addition, the sensitivity of forecasts to initial condition error can be studied with adjoint methods, providing insight into atmospheric predictability. A related problem is the idea of using an adjoint model to 'target' specific upstream locations where additional observations are likely to have maximum impact on forecast skill. The work described here is performed with the goal of assisting the Fronts and Atlantic Storm Track Experiment (FASTEX), which has a field phase in January and February 1997. Patterns of initial condition sensitivity in four North Atlantic frontal cyclones are examined using adjoint and tangent linear versions of the Navy Operational Global Atmospheric Prediction System (NOGAPS, Hogan and Rosmond 1991), and the Mesoscale Adjoint Modeling System Version 1 (MAMS1, Errico et al. 1994). In MAMS1, moist processes, including convective and nonconvective precipitation are included. NOGAPS is run at T79L18 resolution, MAMS1 with 60km grid spacing and 14 sigma levels. Text North Atlantic Defense Technical Information Center: DTIC Technical Reports database |
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Defense Technical Information Center: DTIC Technical Reports database |
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language |
English |
topic |
Meteorology *CYCLOGENESIS VORTICES WEATHER FORECASTING NORTH ATLANTIC OCEAN DIGITAL SIMULATION FRONTS(METEOROLOGY) ADJOINT MODELS FASTEX(FRONTS AND ATLANTIC STORM TRACK EXPERIMENT) PE61153N |
spellingShingle |
Meteorology *CYCLOGENESIS VORTICES WEATHER FORECASTING NORTH ATLANTIC OCEAN DIGITAL SIMULATION FRONTS(METEOROLOGY) ADJOINT MODELS FASTEX(FRONTS AND ATLANTIC STORM TRACK EXPERIMENT) PE61153N Langland, Rolf H. Rohaly, Gregory D. Adjoint-Based Targeting of Observations for Fastex Cyclones |
topic_facet |
Meteorology *CYCLOGENESIS VORTICES WEATHER FORECASTING NORTH ATLANTIC OCEAN DIGITAL SIMULATION FRONTS(METEOROLOGY) ADJOINT MODELS FASTEX(FRONTS AND ATLANTIC STORM TRACK EXPERIMENT) PE61153N |
description |
Recent development of adjoint versions of numerical weather prediction models makes possible a number of new diagnostic and interpretive techniques that can be applied to atmospheric forecasting. For example, adjoint models can be used to evaluate conceptual ideas of atmospheric processes, including considerations of potential vorticity and the Charney and Eady problems that relate to extratropical cyclone development (Langland et al. 1995). In addition, the sensitivity of forecasts to initial condition error can be studied with adjoint methods, providing insight into atmospheric predictability. A related problem is the idea of using an adjoint model to 'target' specific upstream locations where additional observations are likely to have maximum impact on forecast skill. The work described here is performed with the goal of assisting the Fronts and Atlantic Storm Track Experiment (FASTEX), which has a field phase in January and February 1997. Patterns of initial condition sensitivity in four North Atlantic frontal cyclones are examined using adjoint and tangent linear versions of the Navy Operational Global Atmospheric Prediction System (NOGAPS, Hogan and Rosmond 1991), and the Mesoscale Adjoint Modeling System Version 1 (MAMS1, Errico et al. 1994). In MAMS1, moist processes, including convective and nonconvective precipitation are included. NOGAPS is run at T79L18 resolution, MAMS1 with 60km grid spacing and 14 sigma levels. |
author2 |
NAVAL RESEARCH LAB MONTEREY CA |
format |
Text |
author |
Langland, Rolf H. Rohaly, Gregory D. |
author_facet |
Langland, Rolf H. Rohaly, Gregory D. |
author_sort |
Langland, Rolf H. |
title |
Adjoint-Based Targeting of Observations for Fastex Cyclones |
title_short |
Adjoint-Based Targeting of Observations for Fastex Cyclones |
title_full |
Adjoint-Based Targeting of Observations for Fastex Cyclones |
title_fullStr |
Adjoint-Based Targeting of Observations for Fastex Cyclones |
title_full_unstemmed |
Adjoint-Based Targeting of Observations for Fastex Cyclones |
title_sort |
adjoint-based targeting of observations for fastex cyclones |
publishDate |
1996 |
url |
http://www.dtic.mil/docs/citations/ADA319126 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA319126 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA319126 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766127998256283648 |