DOI: 10.1175/JCLI-D-11-00424.1
Scopus记录号: 2-s2.0-84862742222
论文题名: Diagnosis of tropical biases and the MJO from patterns in the MERRA analysis tendency fields
作者: Mapes B.E. ; Bacmeister J.T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 18 起始页码: 6202
结束页码: 6214
语种: 英语
Scopus关键词: Baroclinic
; Coupled waves
; Data assimilation
; Deep convection
; Goddard earth observing systems
; Leading edge
; Madden-Julian oscillation
; Model development
; Momentum fields
; North Atlantic Ocean
; Physical process
; Reanalysis
; Research and application
; Temperature structure
; Thermal winds
; Natural convection
; Phase transitions
; Plasma diagnostics
; Slow wave structures
; Vapors
; Tropics
; atmospheric convection
; atmospheric dynamics
; atmospheric modeling
; atmospheric wave
; data assimilation
; EOS
; Madden-Julian oscillation
; temperature profile
; tropical meteorology
; water vapor
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: The Modern-Era Reanalysis for Research and Applications (MERRA) is realistic, including its Madden- Julian oscillation (MJO), which the underlying model [Goddard Earth Observing System, version 5 (GEOS-5)] lacks. In theMERRA budgets, analysis tendencies (ATs) make evolution realistic despite model shortcomings. The ATs are the negative of physical process errors, if dynamical tendencies are accurate. Pattern resemblances between ATs and physical tendencies suggest which processes are erroneous. The authors examined patterns of tropical ATs in four dimensions and found several noteworthy features. TemperatureAT profiles show thatmoist physics has erroneous sharp cooling at 700 hPa, a signature of misplaced melting and perhaps excessive precipitation evaporation. This excites a distinctive (fingerprint) erroneous short vertical wavelength temperature structure, perhaps a cause of the GEOS-5 too-slow convectively coupled waves. The globe's largestATof 200-hPa wind stems from overactive heating over the intra-Americas seas region in summer, with the same moist physics fingerprint. The erroneous heating produces a baroclinic vortex that is countered by ATs opposing its temperature and momentum fields in a thermal wind balanced sense. Lack of restraint in the deep convection scheme is also indicated inMJO composites, where the water vapor AT is anomalously positive on the leading edge, indicating a premature vapor sink. Since GEOS-5 lacks an MJO, this diagnosis suggests that the transition from shallow to deep convection (moistening to drying) is crucial in the real-world MJO. This is not news, but its diagnosis by ATs provides an objective, repeatable way to measure the effect that could be a useful guide in model development. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52243
Appears in Collections: 气候变化事实与影响
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作者单位: Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Miami, FL, United States; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Mapes B.E.,Bacmeister J.T.. Diagnosis of tropical biases and the MJO from patterns in the MERRA analysis tendency fields[J]. Journal of Climate,2012-01-01,25(18)