Global Distributions of Tropospheric and Stratospheric Gravity Wave Momentum Fluxes Resolved by the 9-km ECMWF Experiments
Global Distributions of Tropospheric and Stratospheric Gravity Wave Momentum Fluxes Resolved by the 9-km ECMWF Experiments
复制标题
9公里ECMWF实验解析的对流层和平流层重力波动量通量的全球分布
DOI：
10.1175/jas-d-21-0173.1
复制
发表时间：
2022
影响因子：
3.1
通讯作者：
Sun, Y. Qiang
中科院分区：
文献类型：
--
作者：
Wei, Junhong;Zhang, Fuqing;Richter, Jadwiga H.;Alexander, M. Joan;Sun, Y. Qiang
基于欧洲中期天气预报中心（ECMWF）的9公里综合预报系统（IFS）对夏季和冬季事件选定时期的20天控制预报，本研究利用有史以来最高分辨率的全球业务数值天气预报模式分析了重力波动量通量的全球分布。利用18 km ECMWF IFS试验和30 km ERA5试验两个补充数据集进行比较。平流层中，斜压不稳定性强的冬季温带地区明显以西向动量通量为主，而夏季热带地区则以东向动量通量为主。然而，与上述纬向动量通量同等重要的经向动量通量在局部表现出不同的全球分布特征，特别是在低海拔地区，南北动量通量相互交替。这两个事件都提供了确凿的证据，表明在ECMWF预报中，平流层通量更强，分辨率更高，而ERA5数据集的信号总体上最弱，无论是否应用重新网格。在对流层，垂直运动扰动的概率分布是高度不对称的，特别是在可能由对流强迫引起的大雨覆盖的纬度上，具有更强的正信号。在计算对流层波致通量之前，借助降水积累，提出了一种简单的滤波方法，试图通过对流强迫消除对流层的不对称。此外，本研究显示了有希望的发现，即所提出的滤波方法可以帮助减少在估计对流层波致通量方面的潜在不确定性。最后，给出了采用所提方法的绝对动量通量分布，以供将来进一步评估。
Based on 20-day control forecasts by the 9-km Integrated Forecasting System (IFS) at the European Centre for Medium-Range Weather Forecasts (ECMWF) for selected periods of summer and winter events, this study investigates global distributions of gravity wave momentum fluxes resolved by the highest-resolution-ever global operational numerical weather prediction model. Two supplementary datasets, including 18-km ECMWF IFS experiments and the 30-km ERA5, are included for comparison. In the stratosphere, there is a clear dominance of westward momentum fluxes over the winter extratropics with strong baroclinic instability, while eastward momentum fluxes are found in the summer tropics. However, meridional momentum fluxes, locally as important as the above zonal counterpart, show different behaviors of global distribution characteristics, with northward and southward momentum fluxes alternating with each other especially at lower altitudes. Both events illustrate conclusive evidence that stronger stratospheric fluxes are found in the ECMWF forecast with finer resolution, and that ERA5 datasets have the weakest signals in general, regardless of whether regridding is applied. In the troposphere, probability distributions of vertical motion perturbations are highly asymmetric with more strong positive signals especially over latitudes covering heavy rainfall, likely caused by convective forcing. With the aid of precipitation accumulation, a simple filtering method is proposed in an attempt to eliminate those tropospheric asymmetries by convective forcing, before calculating tropospheric wave-induced fluxes. Furthermore, this research demonstrates promising findings that the proposed filtering method could help in reducing the potential uncertainties with respect to estimating tropospheric wave-induced fluxes. Finally, absolute momentum flux distributions with proposed approaches are presented, for further assessment in the future.
登录
查看更多内容
影响因子：
2.9
作者：
Tingting Qian;Fuqing Zhang;Junhong Wei;Jie He;Yinghui Lu
通讯作者：
Tingting Qian;Fuqing Zhang;Junhong Wei;Jie He;Yinghui Lu
大气可预测性的三维多元模态分析及其在 ECMWF 系综中的应用
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
N. Žagar;R. Buizza;J. Tribbia
通讯作者：
J. Tribbia
急流附近惯性重力波和剪切不稳定性的观测和数值模拟
影响因子：
3.1
作者：
T. Lane;J. Doyle;R. Plougonven;M. Shapiro;R. Sharman
通讯作者：
R. Sharman
垂直传播的山波——对高空飞行的飞机有危险吗？
影响因子：
3
作者：
M. Bramberger;A. Dörnbrack;H. Wilms;Steffen Gemsa;Kevin D Raynor;R. Sharman
通讯作者：
R. Sharman
使用 WRF 模型量化湿斜压波数值模拟中产生的不平衡和惯性重力波
影响因子：
3.1
作者：
M. Mirzaei;A. Mohebalhojeh;C. Zülicke;R. Plougonven
通讯作者：
R. Plougonven