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Impact of the Vertical Resolution of Analysis Data on the Estimates of Large-Scale Inertio-Gravity Energy.
- Source :
- Monthly Weather Review; Jul2012, Vol. 140 Issue 7, p2297-2307, 11p, 4 Charts, 6 Graphs
- Publication Year :
- 2012
-
Abstract
- This paper deals with the large-scale inertio-gravity (IG) wave energy in the operational ECMWF analyses in July 2007. Energy percentages of the IG waves obtained from the standard-pressure-level data are compared to those derived from various discretizations of the model-level data. The results show a small albeit systematic increase of the IG energy percentage as the vertical level density increases from the standard-pressure levels toward the model-level density; the small relative change is explained by the sufficient vertical resolution to resolve the large-scale IG waves in the tropics that make the majority of the global IG energy on large scales. A relatively larger increase of the IG energy is obtained when the mesospheric model levels are included; however, the analyses at these levels in July 2007 are less reliable. Furthermore, two numerical methods for the normal-mode function (NMF) decomposition are shown to provide similar results. The decomposition of atmospheric analyses into the NMF series is proposed as a tool to analyze the spatial and temporal variations of the large-scale equatorial waves and their role in global energetics. [ABSTRACT FROM AUTHOR]
- Subjects :
- WAVE energy
GRAVITY waves
METEOROLOGICAL research
METEOROLOGY
WEATHER forecasting
Subjects
Details
- Language :
- English
- ISSN :
- 00270644
- Volume :
- 140
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Monthly Weather Review
- Publication Type :
- Academic Journal
- Accession number :
- 77570095
- Full Text :
- https://doi.org/10.1175/MWR-D-11-00103.1