Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-016-3411-1 |
WES feedback and the Atlantic Meridional Mode: observations and CMIP5 comparisons | |
Amaya, Dillon J.1; DeFlorio, Michael J.2; Miller, Arthur J.1; Xie, Shang-Ping1 | |
2017-09-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 49 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The Atlantic Meridional Mode (AMM) is the dominant mode of tropical SST/wind coupled variability. Modeling studies have implicated wind-evaporation-SST (WES) feedback as the primary driver of the AMM's evolution across the Atlantic basin; however, a robust coupling of the SST and winds has not been shown in observations. This study examines observed AMM growth, propagation, and decay as a result of WES interactions. Investigation of an extended maximum covariance analysis shows that boreal wintertime atmospheric forcing generates positive SST anomalies (SSTA) through a reduction of surface evaporative cooling. When the AMM peaks in magnitude during spring and summer, upward latent heat flux anomalies occur over the warmest SSTs and act to dampen the initial forcing. In contrast, on the southwestern edge of the SSTA, SST-forced cross-equatorial flow reduces the strength of the climatological trade winds and provides an anomalous latent heat flux into the ocean, which causes southwestward propagation of the initial atmosphere-forced SSTA through WES dynamics. Additionally, the lead-lag relationship of the ocean and atmosphere indicates a transition from an atmosphere-forcing-ocean regime in the northern subtropics to a highly coupled regime in the northern tropics that is not observed in the southern hemisphere. CMIP5 models poorly simulate the latitudinal transition from a one-way interaction to a two-way feedback, which may explain why they also struggle to reproduce spatially coherent interactions between tropical Atlantic SST and winds. This analysis provides valuable insight on how meridional modes act as links between extratropical and tropical variability and focuses future research aimed at improving climate model simulations. |
英文关键词 | Atlantic Meridional Mode WES feedback CMIP5 Air-sea interactions Maximum covariance analysis |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000408718200011 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; OCEAN-ATMOSPHERE MODEL ; SEASONAL FOOTPRINTING MECHANISM ; TROPICAL ATLANTIC ; CLIMATE VARIABILITY ; DECADAL VARIABILITY ; COUPLED MODEL ; NORTH PACIFIC ; HEAT-FLUX ; RAINFALL |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/36450 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif San Diego, Scripps Inst Oceanog, 9500 Gilman Dr 0206, La Jolla, CA 92093 USA; 2.CALTECH, Jet Prop Lab, M-S 300-323,4800 Oak Grove Dr, Pasadena, CA 91109 USA |
推荐引用方式 GB/T 7714 | Amaya, Dillon J.,DeFlorio, Michael J.,Miller, Arthur J.,et al. WES feedback and the Atlantic Meridional Mode: observations and CMIP5 comparisons[J]. CLIMATE DYNAMICS,2017,49. |
APA | Amaya, Dillon J.,DeFlorio, Michael J.,Miller, Arthur J.,&Xie, Shang-Ping.(2017).WES feedback and the Atlantic Meridional Mode: observations and CMIP5 comparisons.CLIMATE DYNAMICS,49. |
MLA | Amaya, Dillon J.,et al."WES feedback and the Atlantic Meridional Mode: observations and CMIP5 comparisons".CLIMATE DYNAMICS 49(2017). |
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