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首页> 外文期刊>ournal of the Meteorological Society of Japan >The Impact of Surface Hydrology on the Simulation of Tropical Intraseasonal Oscillation in NCAR (CCM2) Atmospheric GCM
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The Impact of Surface Hydrology on the Simulation of Tropical Intraseasonal Oscillation in NCAR (CCM2) Atmospheric GCM

机译：NCAR（CCM2）大气GCM中地表水文学对热带季节内振荡模拟的影响

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The impact of surface hydrological processes in the simulation of tropical climate by the Community Climate Model Version 2 (CCM2) has been studied. Two ten year climate simulations have been analysed to study the effect of surface hydrology feedback. In one of the simulations the surface moisture was determined interactively (VAR_HYD), while in the other simulation the surface moisture was fixed to annual climatological values (FIX_HYD). The simulated values of soil moisture in the VAR_HYD simulation are higher than the annual climatological values, both during northern summer and winter seasons. The impact of surface hydrology on precipitation was larger during northern summer than during the northern winter season. The impact of surface hydrology specification was found to be not entirely local in the model. It appears to have a remote impact on the other parts of the tropics. The precipitation increased over the Indian region, and off-equatorial West Pacific in the interactive hydrology simulation (vis-a-vis FIX_HYD) and reduced over the equatorial West Pacific regions. The simulation of precipitation also improves over the East Pacific region with the incorporation of interactive hydrology. The differences in precipitation between the VAR_HYD and the FIX_HYD simulations are associated with differences in vertical moist static stability and 500 hPa vertical velocity. From harmonic analysis of OLR it was found that the power and frequency in the intraseasonal scales is simulated more realistically with the incorporation of interactive surface hydrology. The interactive hydrology was found to be necessary for the simulation of meridional propagations of convective zones over the Indian region (on intraseasonal time-scales). The meridional migration is not observed in the simulation with fixed surface hydrology, and is on account of non-monotonic variation of vertically integrated moist static energy. The specification of continental surface hydrological processes did not however have a significant impact on the simulation of the equatorially trapped waves, such as the Madden-Julian Oscillation (MJO), though the propagations are discontinuous in the FIX_HYD simulation.
机译：研究了社区气候模型第2版（CCM2）对热带气候模拟中地表水文过程的影响。已经对两个十年的气候模拟进行了分析，以研究地表水文学反馈的影响。在其中一个模拟中，以交互方式确定表面湿度（VAR_HYD），而在另一个模拟中，将表面湿度固定为年度气候值（FIX_HYD）。在北部夏季和冬季，VAR_HYD模拟中的土壤湿度模拟值均高于年度气候值。在北部夏季，地表水文学对降水的影响要大于北部冬季。发现地表水文规范的影响在模型中并不完全是局部的。它似乎对热带地区的其他地区影响很小。在交互式水文学模拟中（相对于FIX_HYD），印度地区和赤道西太平洋的降水增加，而赤道西太平洋地区的降水减少。通过整合互动水文学，东太平洋地区的降水模拟也得到了改善。 VAR_HYD和FIX_HYD模拟之间的降水差异与垂直湿静态稳定性和500 hPa垂直速度的差异相关。通过对OLR的谐波分析，发现通过结合交互式地表水文学，可以更现实地模拟季节内尺度的功率和频率。交互式水文学被发现对于模拟印度地区对流区的经向传播是必要的（在季节内时间尺度上）。在具有固定表面水文学的模拟中未观察到子午线迁移，这是由于垂直积分的湿静态能量的非单调变化所致。尽管在FIX_HYD模拟中传播是不连续的，但大陆表面水文过程的规范对诸如Madden-Julian振荡（MJO）之类的赤道陷波的模拟没有重大影响。

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