GSTDTAP  > 地球科学
DOI10.1175/JAS-D-17-0188.1
Sensitivity of Idealized Moist Baroclinic Waves to Environmental Temperature and Moisture Content
Kirshbaum, D. J.1; Merlis, T. M.1; Gyakum, J. R.1; McTaggart-Cowan, R.2
2018
发表期刊JOURNAL OF THE ATMOSPHERIC SCIENCES
ISSN0022-4928
EISSN1520-0469
出版年2018
卷号75期号:1页码:337-360
文章类型Article
语种英语
国家Canada
英文摘要

Idealized simulations are used to examine the sensitivity of moist baroclinic wave growth to environmental temperature and moisture content. With relative humidity held fixed, the surface temperature at 45 degrees N, denoted T-0, is varied from 275 to 290 K. As T-0 increases, the atmospheric moisture content, moist instability, and moist available potential energy also increase. For the chosen initial configuration, moist waves develop larger eddy kinetic energy K-e than corresponding dry waves, but enhanced diabatic heating at larger T-0 does not further increase K-e. This finding is linked to a warm-frontal cyclonic potential vorticity (PV) anomaly that strengthens and shifts downstream at larger T-0 owing to increased diabatic heating along the frontal cloud band. This eastward shift feeds back negatively on the parent cyclone by increasing the downstream export of mechanical energy aloft and degrading the phasing between dry baroclinic vertical motion and buoyancy within the warm sector. The latter suppresses the conversion from eddy potential energy to K-e [C(P-e, K-e)], offsetting a direct enhancement of C(P-e, K-e) by diabatic heating. Compared to their dry counterparts, isolated moist waves (initiated by a single finite-amplitude PV anomaly) display a similar sensitivity to T-0, while periodic wave trains (initiated by multiple such anomalies) exhibit a stronger negative relationship. The latter stems from anticyclonic diabatic PV anomalies aloft that originate along the warm front and recirculate through the system to interact with the upper-level trough. This interaction leads to a horizontal forward wave tilt that enhances the conversion of wave K-e into zonal-mean kinetic energy.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000425750200019
WOS关键词LIFE-CYCLE ; EXTRATROPICAL CYCLONES ; TROPICAL CYCLONES ; INSTABILITY ; DYNAMICS ; CYCLOGENESIS ; SIMULATIONS ; CONVECTION ; STABILITY ; FRICTION
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/29309
专题地球科学
作者单位1.McGill Univ, Montreal, PQ, Canada;
2.Environm & Climate Change Canada, Dorval, PQ, Canada
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GB/T 7714
Kirshbaum, D. J.,Merlis, T. M.,Gyakum, J. R.,et al. Sensitivity of Idealized Moist Baroclinic Waves to Environmental Temperature and Moisture Content[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(1):337-360.
APA Kirshbaum, D. J.,Merlis, T. M.,Gyakum, J. R.,&McTaggart-Cowan, R..(2018).Sensitivity of Idealized Moist Baroclinic Waves to Environmental Temperature and Moisture Content.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(1),337-360.
MLA Kirshbaum, D. J.,et al."Sensitivity of Idealized Moist Baroclinic Waves to Environmental Temperature and Moisture Content".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.1(2018):337-360.
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