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Impact of two different types of El Nino events on the Amazon climate and ecosystem productivity

Journal of Plant Ecology 2011年第1期4卷 91-99页

作者： Wenhong Li Pengfei Zhang Jiansheng Ye Laifang Li paul abaker Earth and Ocean Sciences Nicholas School of the EnvironmentDuke UniversityDurhamNC 27708USA College of Atmospheric Sciences and Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information TechnologyNo.24Block 1Xuefu RoadChengduSichuan610225P.R.China MOE Key Laboratory of Arid and Grassland Ecology School of Life ScienceLanzhou UniversityNo.222 Tianshui South RoadLanzhou730000P.R.China

Aims The Amazon basin plays an important role in the global carbon *** climate variability associated with El Nino can affect the Amazon ecosystem carbon *** recent years,studies have suggested that there are two different types of El Ninos:eastern-Pacific(EP)El Nino and central-Pacific(CP)El *** impacts of two types of El Nino on the Amazon climate and Amazon ecosystem are analyzed in the *** A composite method has been applied to highlight the common features for the EP-and CP-El Nino events using observational data,IPCC-AR4 model *** impacts of the two different types of El Nino on ecosystem carbon sequestration over the Amazon have been investigated using a process-based biogeochemical model,the Biome–BioGeochemical Cycles model(Biome–BGC).Important Findings Below-normal rainfall is observed year round in northern,central and eastern Amazonia during EP-El Nino *** CP-El Nino years,negative rainfall anomalies are observed in most of the Amazon during the austral summer wet season,while there is average or above-average precipitation in other ***-and CP-El Nino events produce strikingly different precipitation anomaly pattern in the tropical and subtropical Andes during the austral fall season:wetter conditions prevail during EP-El Nino years and drier conditions during CP-El Nino *** are above-average year round throughout tropical South America during EP-El Nino events,especially during austral *** CP-El Nino events,average or slightly above-average temperatures prevail in the tropics,but these temperatures are less extreme than EP year’s temperature except in austral *** precipitation and temperature anomalies influence ecosystem productivity and carbon sequestration throughout the *** the Biome–BGC model,we find that net ecosystem production(NEP)in the EP-El Nino years is below average,in agreement with most previous studies;such results indicate that the

关键词： EP-El Nino CP-El Nino Amazon climate Amazon ecosystem Amazon carbon sequestration

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