Abstract
AbstractFrom January through March 2017, a series of extreme precipitation events occurred in coastal Peru, causing severe floods with hundreds of human casualties and billions of dollars in economic losses. The extreme precipitation was a result of unusually strong recurrent patterns of atmospheric and oceanic conditions, including extremely warm coastal sea surface temperatures (SST) and weakened trade winds. These climatic features and their causal relationship with the Peruvian precipitation were examined. Diagnostic analysis and model experiments suggest that an atmospheric forcing in early 2017, which was moderately linked to the Trans-Niño Index (TNI), initiated the local SST warming along coastal Peru that later expanded to the equator. In January 2017, soil moisture was increased by an unusual expansion of Amazonian rainfall. By March, localized and robust SST warming provided positive feedback to the weakening of the trade winds, leading to increased onshore wind and a subsequent enhancement in rainfall. The analysis points to a tendency towards more frequent and stronger variations in the water vapor flux convergence along the equator, which is associated with the increased precipitation in coastal Peru.
Funder
National Research Foundation of Korea
Publisher
Springer Science and Business Media LLC
Reference33 articles.
1. Adler RF, Huffman GJ, Chang A, Ferraro R, Xie P, Janowiak J, Rudolf B, Schneider U, Curtis S, Bolvin D, Gruber A, Susskind J, Arkin P (2003) The version 2 global precipitation climatology project (GPCP) monthly precipitation analysis (1979-Present). J Hydrometeor 4:1147–1167
2. Albert A, Echevin V, Lévy M, Aumont O (2010) Impact of nearshore wind stress curl on coastal circulation primary productivity in the Peru upwelling system. J Geophys Res 115:C12033. https://doi.org/10.1029/2010JC006569
3. Back LE, Bretherton CS (2009) On the relationship between SST gradients, boundary layer winds and convergence over tropical oceans. J. Clim 22:4182–4196. https://doi.org/10.1175/2009JCLI2392.1
4. Behringer D, Xue Y (2004) Evaluation of the global ocean data assimilation system at NCEP: The Pacific Ocean. In: Proc. Eighth Symp. on Integrated Observing and Assimilation Systems for Atmosphere, Oceans, and Land Surface, AMS 84th Annual Meeting, Washington State Convention and Trade Center, Seattle, Washington, 11-15 January 2004. http://ams.confex.com/ams/pdfpapers/70720.pdf]
5. Chen T-C (1985) Global water vapor flux and maintenance during FGGE. Mon Weather Rev 113:1801–1819
Cited by
21 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献