气候变化领域集成服务门户(CCPortal): Vertical Turbulent Cooling of the Mixed Layer in the Atlantic ITCZ and Trade Wind Regions

CCPortal

DOI	10.1029/2019JC015529
	Vertical Turbulent Cooling of the Mixed Layer in the Atlantic ITCZ and Trade Wind Regions
	Foltz G.R.; Hummels R.; Dengler M.; Perez R.C.; Araujo M.
发表日期	2020
ISSN	21699275
卷号	125 期号:2
英文摘要	The causes of the seasonal cycle of vertical turbulent cooling at the base of the mixed layer are assessed using observations from moored buoys in the tropical Atlantic Intertropical Convergence Zone (ITCZ) (4°N, 23°W) and trade wind (15°N, 38°W) regions together with mixing parameterizations and a one-dimensional model. At 4°N the parameterized turbulent cooling rates during 2017–2018 and 2019 agree with indirect estimates from the climatological mooring heat budget residual: both show mean cooling of 25–30 W m (Formula presented.) during November–July, when winds are weakest and the mixed layer is thinnest, and 0–10 W m (Formula presented.) during August–October. Mixing during November–July is driven by variability on multiple time scales, including subdiurnal, near-inertial, and intraseasonal. Shear associated with tropical instability waves (TIWs) is found to generate mixing and monthly mean cooling of 15–30 W m (Formula presented.) during May–July in 2017 and 2019. At 15°N the seasonal cycle of turbulent cooling is out of phase compared to 4°N, with largest cooling of up to 60 W m (Formula presented.) during boreal fall. However, the relationships between wind speed, mixed layer depth, and turbulent mixing are similar: weaker mean winds and a thinner mixed layer in the fall are associated with stronger mixing and turbulent cooling of SST. These results emphasize the importance of seasonal modulations of mixed layer depth at both locations and shear from TIWs at 4°N. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	mixing; near-inertial waves; sea surface temperature; tropical Atlantic; tropical instability waves
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186985
作者单位	NOAA/Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, United States; GEOMAR Helmholz Centre for Ocean Research, Kiel, Germany; Department of Oceanography, DOCEAN, UFPE, University Federal Pernambuco, Recife, Brazil; Brazilian Research Network on Global Climate Change, São José Dos Campos, Brazil
推荐引用方式 GB/T 7714	Foltz G.R.,Hummels R.,Dengler M.,et al. Vertical Turbulent Cooling of the Mixed Layer in the Atlantic ITCZ and Trade Wind Regions[J],2020,125(2).
APA	Foltz G.R.,Hummels R.,Dengler M.,Perez R.C.,&Araujo M..(2020).Vertical Turbulent Cooling of the Mixed Layer in the Atlantic ITCZ and Trade Wind Regions.Journal of Geophysical Research: Oceans,125(2).
MLA	Foltz G.R.,et al."Vertical Turbulent Cooling of the Mixed Layer in the Atlantic ITCZ and Trade Wind Regions".Journal of Geophysical Research: Oceans 125.2(2020).