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首页> 外文期刊>Quarterly Journal of the Royal Meteorological Society >Propagation of the Madden-Julian Oscillation through the Maritime Continent and scale interaction with the diurnal cycle of precipitation
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Propagation of the Madden-Julian Oscillation through the Maritime Continent and scale interaction with the diurnal cycle of precipitation

机译：通过海陆传播马登-朱利安涛动，并与降水的昼夜周期进行尺度相互作用

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摘要

The convectively active part of the Madden-Julian Oscillation (MJO) propagates eastward through the warm pool, from the Indian Ocean through the Maritime Continent (the Indonesian archipelago) to the western Pacific. The Maritime Continent's complex topography means the exact nature of the MJO propagation through this region is unclear. Model simulations of the MJO are often poor over the region, leading to local errors in latent heat release and global errors in medium-range weather prediction and climate simulation. Using 14 northern winters of TRMM satellite data it is shown that, where the mean diurnal cycle of precipitation is strong, 80% of the MJO precipitation signal in the Maritime Continent is accounted for by changes in the amplitude of the diurnal cycle. Additionally, the relationship between outgoing long-wave radiation (OLR) and precipitation is weakened here, such that OLR is no longer a reliable proxy for precipitation. The canonical view of the MJO as the smooth eastward propagation of a large-scale precipitation envelope also breaks down over the islands of the Maritime Continent. Instead, a vanguard of precipitation (anomalies of 2.5 mm day(-1) over 10(6) km(2)) jumps ahead of the main body by approximately 6 days or 2000 km. Hence, there can be enhanced precipitation over Sumatra, Borneo or New Guinea when the large-scale MJO envelope over the surrounding ocean is one of suppressed precipitation. This behaviour can be accommodated into existing MJO theories. Frictional and topographic moisture convergence and relatively clear skies ahead of the main convective envelope combine with the low thermal inertia of the islands, to allow a rapid response in the diurnal cycle which rectifies onto the lower-frequency MJO. Hence, accurate representations of the diurnal cycle and its scale interaction appear to be necessary for models to simulate the MJO successfully.
机译：Madden-Julian涛动（MJO）的对流活跃部分通过温暖的池向东传播，从印度洋到海洋大陆（印度尼西亚群岛）再到西太平洋。海洋大陆的复杂地形意味着MJO在该区域传播的确切性质尚不清楚。在该地区，MJO的模型模拟通常很差，从而导致潜热释放的局部误差以及中程天气预报和气候模拟的整体误差。使用TRMM卫星冬季的14个冬季，表明，在平均日降水周期很强的情况下，海洋大陆MJO降水信号的80％是由日周期振幅变化引起的。此外，此处的出射长波辐射（OLR）与降水之间的关系被削弱，因此OLR不再是降水的可靠替代。 MJO的典型观点是大规模降水包络线向东的平滑传播，也打破了海洋大陆的各岛。取而代之的是，降水的先锋（距地10（6）km（2）处2.5毫米day（-1）的异常）跳离了主体约6天或2000 km。因此，当周围海洋上的大规模MJO包层是抑制降水之一时，苏门答腊，婆罗洲或新几内亚的降水会增加。可以将这种行为纳入现有的MJO理论中。摩擦和地形上的水分汇聚以及主要对流包络之前的相对晴朗的天空以及这些岛的低热惯性相结合，以允许在昼夜周期中快速响应，并逐渐转变为低频MJO。因此，对于模型成功地模拟MJO而言，准确描述昼夜周期及其尺度相互作用似乎是必要的。

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