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DOI | 10.1007/s00382-015-2567-4 |
Anomaly transform methods based on total energy and ocean heat content norms for generating ocean dynamic disturbances for ensemble climate forecasts | |
Romanova, Vanya; Hense, Andreas | |
2017-08-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 49期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | In our study we use the anomaly transform, a special case of ensemble transform method, in which a selected set of initial oceanic anomalies in space, time and variables are defined and orthogonalized. The resulting orthogonal perturbation patterns are designed such that they pick up typical balanced anomaly structures in space and time and between variables. The metric used to set up the eigen problem is taken either as the weighted total energy with its zonal, meridional kinetic and available potential energy terms having equal contributions, or the weighted ocean heat content in which a disturbance is applied only to the initial temperature fields. The choices of a reference state for defining the initial anomalies are such that either perturbations on seasonal timescales and or on interannual timescales are constructed. These project a-priori only the slow modes of the ocean physical processes, such that the disturbances grow mainly in the Western Boundary Currents, in the Antarctic Circumpolar Current and the El Nino Southern Oscillation regions. An additional set of initial conditions is designed to fit in a least square sense data from global ocean reanalysis. Applying the AT produced sets of disturbances to oceanic initial conditions initialized by observations of the MPIOM-ESM coupled model on T63L47/GR15 resolution, four ensemble and one hind-cast experiments were performed. The weighted total energy norm is used to monitor the amplitudes and rates of the fastest growing error modes. The results showed minor dependence of the instabilities or error growth on the selected metric but considerable change due to the magnitude of the scaling amplitudes of the perturbation patterns. In contrast to similar atmospheric applications, we find an energy conversion from kinetic to available potential energy, which suggests a different source of uncertainty generation in the ocean than in the atmosphere mainly associated with changes in the density field. |
英文关键词 | Initialization of decadal forecast Anomaly transform method Orthogonal disturbances Total energy norm |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000407244700003 |
WOS关键词 | PREDICTION SYSTEM ; SINGULAR VECTORS ; BRED VECTORS ; COUPLED GCM ; INITIALIZATION ; PERTURBATIONS ; VARIABILITY ; CIRCULATION ; SIMULATION ; MODEL |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/36392 |
专题 | 气候变化 |
作者单位 | Univ Bonn, Inst Meteorol, Hugel 20, D-53121 Bonn, Germany |
推荐引用方式 GB/T 7714 | Romanova, Vanya,Hense, Andreas. Anomaly transform methods based on total energy and ocean heat content norms for generating ocean dynamic disturbances for ensemble climate forecasts[J]. CLIMATE DYNAMICS,2017,49(3). |
APA | Romanova, Vanya,&Hense, Andreas.(2017).Anomaly transform methods based on total energy and ocean heat content norms for generating ocean dynamic disturbances for ensemble climate forecasts.CLIMATE DYNAMICS,49(3). |
MLA | Romanova, Vanya,et al."Anomaly transform methods based on total energy and ocean heat content norms for generating ocean dynamic disturbances for ensemble climate forecasts".CLIMATE DYNAMICS 49.3(2017). |
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