气候变化领域集成服务门户(CCPortal): Impacts of north pacific subtropical and subarctic oceanic frontal zones on the wintertime atmospheric large-scale circulations

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DOI	10.1175/JCLI-D-19-0308.1
	Impacts of north pacific subtropical and subarctic oceanic frontal zones on the wintertime atmospheric large-scale circulations
	Huang J.; Zhang Y.; Yang X.-Q.; Ren X.; Hu H.
发表日期	2020
ISSN	0894-8755
起始页码	1897
结束页码	1914
卷号	33 期号:5
英文摘要	An oceanic frontal zone is a confluent region of warm and cool ocean currents, characterized by a strong meridional gradient of sea surface temperature (SST). High-resolution SST observations show that the wintertime North Pacific exhibits a unique double-oceanic-front structure, with a subtropical frontal zone (STFZ) and a subarctic frontal zone (SAFZ), whose impacts on the weather and climate over the East Asia-North Pacific-North American region need further investigation. In this study, we conduct groups of multiyear and ensemble simulations using a WRF high-resolution regional climate model, through which the different impacts of the STFZ and SAFZ on the wintertime atmospheric circulations are identified and compared. Our multiyear simulations show that the STFZ, although with weaker intensity, exerts evident and consistent impacts on the storm track and westerly jet in the North Pacific by enhancing and elongating the eddy activity, zonal wind, and Aleutian low. The SAFZ exhibits coherent impacts on the low-level atmospheric baroclinicity and storm track; however, its impacts on the upper-level storm track and atmospheric circulations are divergent, exhibiting strong year-by-year difference. Our study suggests that the SAFZ's impacts on the atmospheric circulations strongly depend on the background mean state, which contributes to the divergent impacts of the SAFZ. Furthermore, our results highlight the role of diabatic heating for the above different impacts of the STFZ and SAFZ on the atmosphere. We argue that the much deeper diabatic heating induced by the STFZ, via affecting the baroclinicity through the whole troposphere, can exert consistent influence on eddy activities and atmospheric circulations. © 2020 American Meteorological Society.
英文关键词	Climatology; Ocean currents; Storms; Surface waters; Tropics; Atmospheric baroclinicity; Atmospheric circulation; Ensemble simulation; Large-scale circulation; Meridional gradients; Regional climate modeling; Sea surface temperature (SST); Subarctic frontal zones; Climate models; annual variation; atmospheric circulation; baroclinic mode; climate modeling; diabatic process; eddy; oceanic front; sea surface temperature; winter; Pacific Ocean; Pacific Ocean (North)
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171435
作者单位	CMA-NJU Joint Laboratory for Climate Prediction Studies, Institute for Climate and Global Change Research, School of Atmospheric Sciences, Nanjing University, Nanjing, China
推荐引用方式 GB/T 7714	Huang J.,Zhang Y.,Yang X.-Q.,et al. Impacts of north pacific subtropical and subarctic oceanic frontal zones on the wintertime atmospheric large-scale circulations[J],2020,33(5).
APA	Huang J.,Zhang Y.,Yang X.-Q.,Ren X.,&Hu H..(2020).Impacts of north pacific subtropical and subarctic oceanic frontal zones on the wintertime atmospheric large-scale circulations.Journal of Climate,33(5).
MLA	Huang J.,et al."Impacts of north pacific subtropical and subarctic oceanic frontal zones on the wintertime atmospheric large-scale circulations".Journal of Climate 33.5(2020).