A Spectral Cumulus Parameterization Scheme Interpolating between Two Convective Updrafts with Semi-Lagrangian Calculation of Transport by Compensatory Subsidence
A Spectral Cumulus Parameterization Scheme Interpolating between Two Convective Updrafts with Semi-Lagrangian Calculation of Transport by Compensatory Subsidence
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DOI：
10.1175/mwr-d-14-00068.1
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发表时间：
2015-02
影响因子：
3.2
通讯作者：
Hiromasa Yoshimura;R. Mizuta;H. Murakami
中科院分区：
文献类型：
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作者：
Hiromasa Yoshimura;R. Mizuta;H. Murakami
作者发展了一种新的谱积云参数化方案，它通过在两个具有大和小夹卷率的对流上升气流之间内插云内变量来显式地考虑多个对流上升气流的集合。这种积云方案的优点是，像Tiedtke方案一样，逐层详细地计算卷吸和去训练对流上升气流中的变量，并像Arakawa-Schubert方案一样，显式地表示由于夹卷率不同而产生的不同高度的对流上升气流谱。采用守恒单调的半拉格朗日格式计算对流引起的补偿性下沉输运。半拉格朗日格式的使用放宽了由于Courant-Friedrichs-Lewis(CFL)条件而产生的质量流限制，并确保了非负的自然物质输运。使用该积云方案的全球大气模式给出的大气模拟结果与实际情况吻合较好。
AbstractThe authors have developed a new spectral cumulus parameterization scheme that explicitly considers an ensemble of multiple convective updrafts by interpolating in-cloud variables between two convective updrafts with large and small entrainment rates. This cumulus scheme has the advantages that the variables in entraining and detraining convective updrafts are calculated in detail layer by layer as in the Tiedtke scheme, and that a spectrum of convective updrafts with different heights due to the difference in entrainment rates is explicitly represented, as in the Arakawa–Schubert scheme. A conservative and monotonic semi-Lagrangian scheme is used for calculation of transport by convection-induced compensatory subsidence. Use of the semi-Lagrangian scheme relaxes the mass-flux limit due to the Courant–Friedrichs–Lewy (CFL) condition, and moreover ensures nonnegative natural material transport. A global atmospheric model using this cumulus scheme gives an atmospheric simulation that agrees well wit...