DOI: 10.1175/JCLI-D-18-0150.1
Scopus记录号: 2-s2.0-85061012456
论文题名: Soil moisture variability intensifies and prolongs eastern Amazon temperature and carbon cycle response to El Niño-Southern Oscillation
作者: Levine P.A. ; Randerson J.T. ; Chen Y. ; Pritchard M.S. ; Xu M. ; Hoffman F.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 4 起始页码: 1273
结束页码: 1292
语种: 英语
英文关键词: Amazon region
; Atmosphere-land interaction
; ENSO
; Interannual variability
; Land surface model
; Soil moisture
Scopus关键词: Atmospheric pressure
; Carbon
; Climatology
; Hydrology
; Oceanography
; Soil moisture
; Surface waters
; Amazon region
; Atmosphere-land interactions
; ENSO
; Interannual variability
; Land surface modeling
; Atmospheric temperature
英文摘要: El Niño-Southern Oscillation (ENSO) is an important driver of climate and carbon cycle variability in the Amazon. Sea surface temperature (SST) anomalies in the equatorial Pacific drive teleconnections with temperature directly through changes in atmospheric circulation. These circulation changes also impact precipitation and, consequently, soil moisture, enabling additional indirect effects on temperature through land-atmosphere coupling. To separate the direct influence of ENSO SST anomalies from the indirect effects of soil moisture, a mechanism-denial experiment was performed to decouple their variability in the Energy Exascale Earth System Model (E3SM) forced with observed SSTs from 1982 to 2016. Soil moisture variability was found to amplify and extend the effects of SST forcing on eastern Amazon temperature and carbon fluxes in E3SM. During the wet season, the direct, circulation-driven effect of ENSO SST anomalies dominated temperature and carbon cycle variability throughout the Amazon. During the following dry season, after ENSO SST anomalies had dissipated, soil moisture variability became the dominant driver in the east, explaining 67%-82% of the temperature difference between El Niño and La Niña years, and 85%-91% of the difference in carbon fluxes. These results highlight the need to consider the interdependence between temperature and hydrology when attributing the relative contributions of these factors to interannual variability in the terrestrial carbon cycle. Specifically, when offline models are forced with observations or reanalysis, the contribution of temperature may be overestimated when its own variability is modulated by hydrology via land-atmosphere coupling. © 2019 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117205
Appears in Collections: 气候变化与战略
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Recommended Citation:
Levine P.A.,Randerson J.T.,Chen Y.,et al. Soil moisture variability intensifies and prolongs eastern Amazon temperature and carbon cycle response to El Niño-Southern Oscillation[J]. Journal of Climate,2019-01-01,32(4)