globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2017MS001040
Scopus记录号: 2-s2.0-85038221959
论文题名:
Characterization of Moist Processes Associated With Changes in the Propagation of the MJO With Increasing CO2
作者: Adames Á; F; , Kim D; , Sobel A; H; , Del Genio A; , Wu J
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期:8
起始页码: 2946
结束页码: 2967
语种: 英语
英文关键词: Advection ; Budget control ; Carbon dioxide ; Climate change ; Damping ; Maintenance ; Moisture ; NASA ; Dispersion relationship ; Madden-Julian oscillation ; Moist static energy ; Moisture advection ; Moisture gradient ; Reduced sensitivity ; Static stability ; Tropical convection ; Climatology ; advection ; anomaly ; carbon dioxide ; climate change ; cloud radiative forcing ; damping ; energy budget ; environmental gradient ; Madden-Julian oscillation ; moisture ; precipitation (climatology) ; tropical region ; warming
英文摘要: The processes that lead to changes in the propagation and maintenance of the Madden-Julian Oscillation (MJO) as a response to increasing CO2 are examined by analyzing moist static energy budget of the MJO in a series of NASA GISS model simulations. It is found changes in MJO propagation is dominated by several key processes. Horizontal moisture advection, a key process for MJO propagation, is found to enhance predominantly due to an increase in the mean horizontal moisture gradients. The terms that determine the strength of the advecting wind anomalies, the MJO horizontal scale and the dry static stability, are found to exhibit opposing trends that largely cancel out. Furthermore, reduced sensitivity of precipitation to changes in column moisture, i.e., a lengthening in the convective moisture adjustment time scale, also opposes enhanced propagation. The dispersion relationship of Adames and Kim, which accounts for all these processes, predicts an acceleration of the MJO at a rate of ∼3.5% K−1, which is consistent with the actual phase speed changes in the simulation. For the processes that contribute to MJO maintenance, it is found that damping by vertical MSE advection is reduced due to the increasing vertical moisture gradient. This weaker damping is nearly canceled by weaker maintenance by cloud-radiative feedbacks, yielding the growth rate from the linear moisture mode theory nearly unchanged with the warming. Furthermore, the estimated growth rates are found to be a small, negative values, suggesting that the MJO in the simulation is a weakly damped mode. © 2017. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75697
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; Department of Atmospheric Sciences, University Of Washington, Seattle, WA, United States; Departments of Applied Physics and Applied Mathematics and Earth and Environmental Sciences, Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States; NASA Goddard Institute for Space Studies, New York, NY, United States

Recommended Citation:
Adames Á,F,, Kim D,et al. Characterization of Moist Processes Associated With Changes in the Propagation of the MJO With Increasing CO2[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(8)
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