Interannual biases induced by freshwater flux and coupled feedback in the tropical Pacific
文献类型：期刊论文
| 作者 | Zhang Ronghua
|
| 刊名 | MONTHLY WEATHER REVIEW
 |
| 出版日期 | 2010-05 |
| 卷号 | 138期号:5页码:1715-1737 |
| 关键词 | SEA-SURFACE TEMPERATURE GENERAL-CIRCULATION MODEL NINO-SOUTHERN OSCILLATION LAYER OCEAN MODEL EL-NINO EQUATORIAL PACIFIC MIXED-LAYER CLIMATE MODELS HEAT FLUXES SALINITY |
| 中文摘要 | Freshwater flux (FWF) forcing induced feedback has not been represented adequately in many coupled ocean-atmosphere models of the tropical Pacific. Previously, various approximations have been made in representing the FWF forcing in climate modeling. In this article, using a hybrid coupled model (HCM), sensitivity experiments are performed to examine the extent to which this forcing and related feedback effects can contribute to tropical biases in interannual simulations of the tropical Pacific. The total FWF into the ocean, represented by precipitation (P) minus evaporation (E), (P - E), is separated into its climatological part and interannual anomaly part: FWF(Total) = (P - E)(clim) + FWF(inter). The former can be prescribed (seasonally varying); the latter can be captured using an empirical model linking with large-scale sea surface temperature (SST) variability. Four cases are considered with different FWF(inter) specifications: interannual (P - E) forcing [FWF(inter) = (P - E)(inter)], interannual P forcing (FWF(inter) = P(inter)), interannual E forcing (FWF(inter) = -E(inter)), and climatological (P - E) forcing (FWF(inter) = 0.0), respectively. The HCM-based experiments indicate that different FWF(inter) approximations can modulate interannual variability in a substantial way. The HCM with the interannual (P - E) forcing, in which a positive SST - (P - E)(inter) feedback is included explicitly, has a reasonably realistic simulation of interannual variability. When FWF(inter) is approximated approximated in some ways, the simulated interannual variability can be modulated significantly: it is weakened with the climatological (P - E) forcing and is even more damped with the interannual E forcing but is exaggerated with the interannual P forcing. Quantitatively, taking the interannual (P - E) forcing run as a reference, the Nino-3 SST variance can be reduced by about 12% and 26% in the climatological (P - E) forcing run and interannual E forcing run, respectively, but overestimated by 11% in the P(inter) forcing run. It is demonstrated that FWF can be a clear bias source for coupled model simulations in the tropical Pacific. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2014-08-28 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/18183]  |
| 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 Ronghua. Interannual biases induced by freshwater flux and coupled feedback in the tropical Pacific[J]. MONTHLY WEATHER REVIEW,2010,138(5):1715-1737. |
| APA | Zhang Ronghua.(2010).Interannual biases induced by freshwater flux and coupled feedback in the tropical Pacific.MONTHLY WEATHER REVIEW,138(5),1715-1737. |
| MLA | Zhang Ronghua."Interannual biases induced by freshwater flux and coupled feedback in the tropical Pacific".MONTHLY WEATHER REVIEW 138.5(2010):1715-1737. |
入库方式： OAI收割
来源：海洋研究所
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