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首页> 外文期刊>Dynamics of Atmospheres and Oceans >Comparative energetics of ERA-40,JRA-25 and NCEP-R2 reanalysis, in the wave number domain
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Comparative energetics of ERA-40,JRA-25 and NCEP-R2 reanalysis, in the wave number domain

机译：波数域中ERA-40，JRA-25和NCEP-R2再分析的比较能量学

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The European Centre for Medium-Range Weather Forecasts 40-year Reanalysis (ERA-40), the Japan Meteorological Agency and Central Research Institute of Electric Power Industry 25-year Reanalysis (JRA-25), and the National Centers for Environmental Prediction and Department of Energy AMIP-II Reanalysis (NCEP-R2) are inter-compared through a global energetics analysis for all seasons. Overall, the Lorenz energy cycle is consistent among the three datasets. The flow of energy and the peaks and slopes in the spectra of the various components agree between the three reanalysis. Additionally, the temporal variability of the energy cycle terms shows consistency between the three reanalysis. Most differences between the three reanalysis are related to the magnitudes of energy forms and energy conversion/transfer rates at each wave number, generally following the relation ERA - 40 > JRA - 25 > NCEP - R2, and mainly located in the Southern Hemisphere. The best agreement between the three datasets is found for northern winter. Differences between the three datasets are greater for the other seasons, being greatest for northern summer. In general, these discrepancies are fairly modest, being likely due to the different model biases and resolutions, and the different data assimilation methods used by the respective reanalysis systems. The energetics of the three reanalysis become closer to each other in more recent years, which is likely due to the increase in the number of observations assimilated in the reanalysis. The NCEP-R2 reanalysis spectrum is smoother than those of ERA-40 and JRA-25, likely due to filtering and to its lower resolution model. The spectra show a rapid decrease for short waves in NCEP-R2 (n = 36) and ERA-40 (n = 63), as a consequence of filtering. The energy source in the nonlinear wave-wave interactions of kinetic energy, L(n), has a narrower spectral range in NCEP-R2 than in the other datasets. Energetics from the newer JRA-25 reanalysis is generally closer to that of ERA-40, with some exceptions as is the case of zonal-wave interactions of kinetic energy, M(n), for synoptic waves, or for eddy available potential energy, A_E, in the lower troposphere, for which JRA-25 is closer to NCEP-R2.
机译：欧洲中距离天气预报中心40年再分析（ERA-40），日本气象厅和电力工业中央研究院25年再分析（JRA-25）以及国家环境预测和部门研究中心能源AMIP-II再分析（NCEP-R2）通过所有季节的全球能量分析进行了相互比较。总体而言，三个数据集之间的洛伦兹能量循环是一致的。能量流以及各种成分的光谱中的峰和斜率在三个重新分析之间是一致的。此外，能量循环项的时间变异性显示了这三个重新分析之间的一致性。三种重新分析之间的大多数差异与每个波数下的能量形式大小和能量转换/传递速率有关，通常遵循关系ERA-40> JRA-25> NCEP-R2，并且主要位于南半球。这三个数据集之间的最佳一致性是北部冬季。这三个数据集之间的差异在其他季节更大，在北部夏季最大。通常，这些差异是相当适度的，可能是由于各自的重新分析系统使用不同的模型偏差和分辨率以及不同的数据同化方法造成的。近年来，这三种重新分析的能量学越来越接近，这很可能是由于重新分析中吸收的观测数量增加所致。 NCEP-R2重分析光谱比ERA-40和JRA-25的光谱更平滑，这可能是由于过滤及其分辨率较低的模型所致。光谱显示，由于过滤，短波在NCEP-R2（n = 36）和ERA-40（n = 63）中迅速减小。动能的非线性波-波相互作用中的能量源L（n）在NCEP-R2中具有比其他数据集中更窄的光谱范围。较新的JRA-25重新分析的能量学通常更接近ERA-40，但有一些例外，例如动能的纬向波相互作用M（n），天气波或涡旋可用势能，在对流层下部，JRA-25更接近NCEP-R2。

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