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| DOI | 10.1175/JCLI-D-19-0374.1 |
| ENSO precipitation anomalies along the equatorial pacific: Moist static energy framework diagnostics | |
| Annamalai H. | |
| 发表日期 | 2020 |
| ISSN | 0894-8755 |
| 起始页码 | 9103 |
| 结束页码 | 9127 |
| 卷号 | 33期号:21 |
| 英文摘要 | With the recognition that equatorial Pacific precipitation anomalies are fundamental to global teleconnections during ENSO winters, the present research applies vertically integrated moist static energy (MSE) budget analysis to historical simulations of CMIP5 models. Process-based assessment is carried out to understand if the models capture the differing processes that account for regional precipitation anomalies along the equatorial Pacific and to isolate a few leading processes that account for the diversified precipitation response to similar SST forcing and vice versa. To assess SST biases in CMIP5, analysis is also carried out in AMIP5 solutions. Diagnostics reveal that models have limitations in representing the "sign"of MSE sources and sinks and, even if they do, compensating errors dominate the budget. The diverse response in precipitation depends on model parameterizations that determine anomalous net radiative flux divergence in the column, free troposphere moisture, and MSE export out of the column, although these processes are not independent. Diagnostics derived from AMIP5 solutions support the findings from CMIP5. The implication is that biases in representing any one of these processes are expected to imprint on others, acknowledging the tight connections among moisture, convection, and radiation. CMIP5 models have limitations in representing the basic states in SST and precipitation over the Niño-3.4 region, and the different convective regimes over the equatorial central and eastern Pacific regions with implications for ENSO. Study limitations are that MSE sources/sinks depend on parameterizations and their interactions, making it difficult to isolate one particular process for attribution. Budgets estimated from monthly anomalies do not capture contributions from high-frequency variability that are vital in closing the budgets. © 2020 American Meteorological Society. |
| 英文关键词 | Climate models; Moisture; Compensating errors; Equatorial Pacific; Free troposphere; High frequency variabilities; Historical simulation; Moist static energy; Precipitation anomalies; Radiative fluxes; Budget control; air-sea interaction; climate modeling; El Nino-Southern Oscillation; parameterization; performance assessment; precipitation assessment; sea surface temperature; teleconnection; thermodynamics; Pacific Ocean; Pacific Ocean (Equatorial) |
| 语种 | 英语 |
| 来源期刊 | Journal of Climate
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/171057 |
| 作者单位 | International Pacific Research Center, Department of Oceanography, University of Hawai'i at Mānoa, Honolulu, HI, United States |
| 推荐引用方式 GB/T 7714 | Annamalai H.. ENSO precipitation anomalies along the equatorial pacific: Moist static energy framework diagnostics[J],2020,33(21). |
| APA | Annamalai H..(2020).ENSO precipitation anomalies along the equatorial pacific: Moist static energy framework diagnostics.Journal of Climate,33(21). |
| MLA | Annamalai H.."ENSO precipitation anomalies along the equatorial pacific: Moist static energy framework diagnostics".Journal of Climate 33.21(2020). |
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