Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-17-0561.1 |
Characterization of Dry Conditions across the US-Affiliated Pacific Islands during Near-Neutral ENSO Phases | |
Ludert, Alejandro1,2; Wang, Bin1,3; Merrifield, Mark A.4 | |
2018-08-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:16页码:6461-6480 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China |
英文摘要 | The U.S.-Affiliated Pacific Islands (USAPIs), located in the tropical western Pacific, are very susceptible to severe drought. Dry season (December-May) rainfall anomalies have different relationships to ENSO for USAPIs north and south of 7 degrees N. South of 7 degrees N, rainfall exhibits a canonical negative correlation with the Oceanic Nino Index (ONI) (i.e., dry conditions during warm periods). To the north, the dry season falls into either canonical or noncanonical (positively correlated with ONI) regimes. Noncanonical years pose an important forecasting challenge as severe droughts have occurred during cool ONI conditions (referred to here as cool dry cases). Composite analysis of the two regimes shows that for noncanonical cool dry years, anticyclonic circulation anomalies over the tropical western North Pacific (TWNP), with a band of anomalous dry conditions extending from the central Pacific toward Micronesia, result in unexpected droughts. In contrast, canonical cool wet events show cyclonic TWNP circulation and increased rainfall over the northern USAPIs. Maximum SST anomalies are located near the date line during noncanonical years, and farther east during canonical years. While both regimes show negative rainfall and TWNP anticyclonic circulation anomalies before the onset of the December-May dry season, during the dry season these anomalies persist during noncanonical events but rapidly reverse sign during canonical events. SST anomalies in the noncanonical regime extend eastward from the central Pacific rather than intensify in place over the eastern Pacific in the canonical regime. Differences in the evolution of circulation, precipitation, and SST anomalies suggest distinct physical mechanisms governing the two ENSO regimes, with possible ramifications for seasonal forecasts. |
英文关键词 | Atmosphere Pacific Ocean ENSO La Nina Precipitation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000438704200003 |
WOS关键词 | NINO-SOUTHERN-OSCILLATION ; SEA-SURFACE TEMPERATURE ; EAST ASIAN TELECONNECTION ; WESTERN NORTH PACIFIC ; TONGUE EL-NINO ; WARM POOL ; EVENTS ; IMPACTS ; CLIMATE ; MODOKI |
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/19870 |
专题 | 气候变化 |
作者单位 | 1.Univ Hawaii Manoa, Dept Atmospher Sci, Honolulu, HI 96822 USA; 2.Univ Hawaii Manoa, Pacific ENSO Applicat Climate Ctr, Honolulu, HI 96822 USA; 3.Nanjing Univ Informat Sci & Technol, Earth Syst Modeling Ctr, Nanjing, Jiangsu, Peoples R China; 4.Univ Hawaii Manoa, Dept Oceanog, Honolulu, HI 96822 USA |
推荐引用方式 GB/T 7714 | Ludert, Alejandro,Wang, Bin,Merrifield, Mark A.. Characterization of Dry Conditions across the US-Affiliated Pacific Islands during Near-Neutral ENSO Phases[J]. JOURNAL OF CLIMATE,2018,31(16):6461-6480. |
APA | Ludert, Alejandro,Wang, Bin,&Merrifield, Mark A..(2018).Characterization of Dry Conditions across the US-Affiliated Pacific Islands during Near-Neutral ENSO Phases.JOURNAL OF CLIMATE,31(16),6461-6480. |
MLA | Ludert, Alejandro,et al."Characterization of Dry Conditions across the US-Affiliated Pacific Islands during Near-Neutral ENSO Phases".JOURNAL OF CLIMATE 31.16(2018):6461-6480. |
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