Improving SST anomaly simulations in a layer ocean model with an embedded entrainment temperature submodel
文献类型：期刊论文
| 作者 | Zhang Rong-Hua
|
| 刊名 | JOURNAL OF CLIMATE
 |
| 出版日期 | 2006-09 |
| 卷号 | 19期号:18页码:4638-4663 |
| 关键词 | TROPICAL PACIFIC-OCEAN GENERAL-CIRCULATION MODELS NINO SOUTHERN-OSCILLATION HYBRID COUPLED MODEL EL-NINO INTERANNUAL VARIABILITY GLOBAL OCEAN ATMOSPHERE SYSTEM EQUATORIAL OCEAN REDUCED-GRAVITY |
| 中文摘要 | In this study, an improved sea surface temperature (SST) anomaly (SSTA) solution for the tropical Pacific is presented by explicitly embedding into a layer ocean general circulation model (OGCM) a separate SSTA submodel with an empirical parameterization for the temperature of subsurface water entrained into the ocean mixed layer (T-e). Instead of using subsurface temperature directly from the OGCM, T-e anomalies for the embedded SSTA submodel are calculated from a historical data-based empirical procedure in terms of sea level (SL) anomalies simulated from the OGCM. An inverse modeling approach is first adopted to estimate T-e anomalies from the SSTA equation using observed SST and simulated upper-ocean currents from the OGCM. A relationship between T-e and SL anomalies is then obtained by utilizing an empirical orthogonal function (EOF) analysis technique. The empirical T-e parameterization optimally leads to a better balanced depiction of the subsurface effect on SST variability by the mean upwelling of anomalous subsurface temperature and vertical mixing in the equatorial Pacific. As compared with a standard OGCM simulation, SSTA simulations from the embedded submodel exhibit more realistic variability, with significantly increased correlation and reduced SSTA errors due to the optimized empirical T-e parameterization. In the Nino-3 region (5 degrees S-5 degrees N, 150 degrees-90 degrees W), the anomaly correlation and root-mean-square (RMS) error of the simulated SST anomalies for the period 1963-96 from the standard OGCM are 0.74 degrees and 0.58 degrees C, while from the embedded SSTA submodel they are 0.94 degrees and 0.29 degrees C in the T-e-dependent experiment, and 0.86 degrees and 0.41 degrees C in the experiment with one-dependent-year data excluded, respectively. Cross validation and sensitivity experiments to training periods for building the T-e parameterization are made to illustrate the robustness and effectiveness of the approach. Moreover, the impact on simulations of SST anomalies and El Nino are examined in hybrid coupled atmosphere-ocean models (HCMs) consisting of the OGCM and a statistical atmospheric wind stress anomaly model that is constructed from a singular value decomposition (SVD) analysis. Results from coupled runs with and without embedding the SSTA submodel are compared. It is demonstrated that incorporating the embedded SSTA submodel in the context of an OGCM has a significant impact on performance of the HCMs and the behavior of the coupled system, with more realistic simulations of interannual SST anomalies (e.g., the amplitude and structure) in the tropical Pacific. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2014-08-27 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/18176]  |
| 专题 | 海洋研究所_海洋环流与波动重点实验室 |
| 推荐引用方式 GB/T 7714 | Zhang Rong-Hua. Improving SST anomaly simulations in a layer ocean model with an embedded entrainment temperature submodel[J]. JOURNAL OF CLIMATE,2006,19(18):4638-4663. |
| APA | Zhang Rong-Hua.(2006).Improving SST anomaly simulations in a layer ocean model with an embedded entrainment temperature submodel.JOURNAL OF CLIMATE,19(18),4638-4663. |
| MLA | Zhang Rong-Hua."Improving SST anomaly simulations in a layer ocean model with an embedded entrainment temperature submodel".JOURNAL OF CLIMATE 19.18(2006):4638-4663. |
入库方式： OAI收割
来源：海洋研究所
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