DOI: 10.1007/s00382-016-2992-z
Scopus记录号: 2-s2.0-84957716329
论文题名: The Bjerknes feedback in the tropical Atlantic in CMIP5 models
作者: Deppenmeier A.-L. ; Haarsma R.J. ; Hazeleger W.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 47, 期: 2017-07-08 起始页码: 2691
结束页码: 2707
语种: 英语
英文关键词: Air–sea interaction
; Bjerknes feedback
; Climate modeling
; Tropical Atlantic variability
英文摘要: Coupled state-of-the-art general circulation models still perform relatively poorly in simulating tropical Atlantic (TA) climate. To investigate whether lack of air–sea interaction might be responsible for their biases, we investigate the Bjerknes feedback (BF) in the TA, the driver of the dominant interannual variability in that region. First, we analyse this mechanism from reanalysis data. Then, we compare our findings to model output from the Coupled Model Intercomparison Project Phase 5. The feedback is subdivided into three components. The first one consists of the influence of eastern equatorial sea surface temperature anomalies (SST’) on zonal wind stress anomalies (τu’) in the western basin. The second component is the influence of wind stress anomalies in the western TA on eastern equatorial oceanic heat content anomalies (HC’). The third component is the local response of overlying SST’ to HC’ in the eastern TA. All three components are shown to be present in ERA-Interim and ORAS4 reanalysis by correlating the two variables of each component with each other. The obtained patterns are compared to the ones from model output via pattern correlation per component. While the models display errors in the annual cycles of SST, τu, and HC, as well as in the seasonality of the feedback, the impact of SST’ on wind stress and the impact of wind stress on HC’ are simulated relatively well by most of the models. This is especially the case when correcting for the error in seasonality. The third component of the BF, the impact of HC’ on SST’ in the eastern part of the basin, deviates from what we find in reanalysis. We find an influence of HC anomalies on overlying SSTs in the eastern equatorial TA, but it is weaker than in the reanalysis and it is not strongly confined to the equator. Longitude–depth cross sections of equatorial temperature variance and correlation between subsurface temperature anomalies and SST’ in the cold tongue region show that flawed simulation and slow adjustment of the subsurface ocean are responsible for this. © 2016, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53536
Appears in Collections: 过去全球变化的重建
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作者单位: Meteorology and Air Quality Department, Wageningen University, Post Box 47, Wageningen, Netherlands; R&D Weather and Climate Modeling, Royal Netherlands Meteorological Institute (KNMI), Utrechtseweg 297, 3731 GA, De Bilt, Netherlands; Netherlands eScience Center (NLeSC), Science Park 140, Amsterdam, Netherlands
Recommended Citation:
Deppenmeier A.-L.,Haarsma R.J.,Hazeleger W.. The Bjerknes feedback in the tropical Atlantic in CMIP5 models[J]. Climate Dynamics,2016-01-01,47(2017-07-08)