文献类型：期刊文献

英文题名：Interdecadal Increase in Spring-To-Summer Persistence of Central American Precipitation Anomalies

作者：Weng, Jinwen[1];Chen, Jiepeng[2,3];Wang, Lei[1];Liu, Junhao[1];Chen, Sheng[2];Wang, Xin[2,3];He, Zhuoqi[2]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang, Peoples R China;[2]Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China;[3]Chinese Acad Sci, South China Sea Inst Oceanol, Guangdong Key Lab Ocean Remote Sensing, Guangzhou, Peoples R China

年份：2026

卷号：53

期号：3

外文期刊名：GEOPHYSICAL RESEARCH LETTERS

收录：SCI-EXPANDED(收录号：WOS:001681084300001)、、EI(收录号：20260720046181)、WOS

基金：This research was jointly supported by the National Natural Science Foundation of China (42276031), Science and Technology Projects in Guangzhou (2024A04J9141), and the Youth Innovation Promotion Association CAS. Author Lei Wang is supported by the National Natural Science Foundation of China (42575021) and the Innovative Team Plan for Department of Education of Guangdong Province (2023KCXTD015). Author Zhuoqi He is supported by the National Natural Science Foundation of China (42275035) and the Guangdong Basic and Applied Basic Research Foundation (2023A1515030102).

语种：英文

外文关键词：tropical SST anomalies; cross-seasonal relationship; precipitation anomalies; Central America; interdecadal change

外文摘要：Central American agriculture and ecosystems are acutely sensitive to rainfall that spans the spring-summer growing window, yet most studies still evaluate each season in isolation. Here we demonstrate that, since the 2000s, Central American precipitation anomalies in spring have become more likely to persist into summer-a shift that single-season analyses overlook. This lengthened persistence arises from a regime change in which multi-month "persistent events" now dominate over the previously common "transitional events." Persistent events are anchored by coupling between warm tropical Atlantic (TA) and cold tropical Central-Eastern Pacific (TCEP) sea surface temperature (SST) anomalies that sustains cyclonic circulation, whereas transitional events rely on rapid TCEP SST reversals that disrupt rainfall anomalies. Strengthened Atlantic influences on Pacific climate since 2000 have prolonged Pacific SST persistence, boosting persistent-event frequency and extending springtime rainfall anomalies into summer. This cross-seasonal persistence heightens risks to water, food and biodiversity in Central America.