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DOI | 10.1007/s00382-017-3627-8 |
Influence of surface nudging on climatological mean and ENSO feedbacks in a coupled model | |
Zhu, Jieshun1,2; Kumar, Arun1 | |
2018 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 50页码:571-586 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Studies have suggested that surface nudging could be an efficient way to reconstruct the subsurface ocean variability, and thus a useful method for initializing climate predictions (e.g., seasonal and decadal predictions). Surface nudging is also the basis for climate models with flux adjustments. In this study, however, some negative aspects of surface nudging on climate simulations in a coupled model are identified. Specifically, a low-resolution version of the NCEP Climate Forecast System, version 2 (CFSv2L) is used to examine the influence of nudging on simulations of climatological mean and on the coupled feedbacks during ENSO. The effect on ENSO feedbacks is diagnosed following a heat budget analysis of mixed layer temperature anomalies. Diagnostics of the climatological mean state indicates that, even though SST biases in all ocean basins, as expected, are eliminated, the fidelity of climatological precipitation, surface winds and subsurface temperature (or the thermocline depth) could be highly ocean basin dependent. This is exemplified by improvements in the climatology of these variables in the tropical Atlantic, but degradations in the tropical Pacific. Furthermore, surface nudging also distorts the dynamical feedbacks during ENSO. For example, while the thermocline feedback played a critical role during the evolution of ENSO in a free simulation, it only played a minor role in the nudged simulation. These results imply that, even though the simulation of surface temperature could be improved in a climate model with surface nudging, the physics behind might be unrealistic. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000422908700036 |
WOS关键词 | EASTERN EQUATORIAL PACIFIC ; GENERAL-CIRCULATION MODEL ; OCEAN-ATMOSPHERE MODELS ; THERMOCLINE DEPTH ; INDIAN-OCEAN ; EL-NINO ; VARIABILITY ; CLIMATE ; SST ; TEMPERATURE |
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/36211 |
专题 | 气候变化 |
作者单位 | 1.NOAA NWS NCEP, Climate Predict Ctr, 5830 Univ Res Court, College Pk, MD 20740 USA; 2.Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA |
推荐引用方式 GB/T 7714 | Zhu, Jieshun,Kumar, Arun. Influence of surface nudging on climatological mean and ENSO feedbacks in a coupled model[J]. CLIMATE DYNAMICS,2018,50:571-586. |
APA | Zhu, Jieshun,&Kumar, Arun.(2018).Influence of surface nudging on climatological mean and ENSO feedbacks in a coupled model.CLIMATE DYNAMICS,50,571-586. |
MLA | Zhu, Jieshun,et al."Influence of surface nudging on climatological mean and ENSO feedbacks in a coupled model".CLIMATE DYNAMICS 50(2018):571-586. |
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