气候变化领域集成服务门户(CCPortal): Characteristics of the North pacific oscillation in CMIP5 models in relation to atmospheric mean states

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DOI	10.1175/JCLI-D-19-0446.1
	Characteristics of the North pacific oscillation in CMIP5 models in relation to atmospheric mean states
	Sung M.-K.; Yoo C.; Yeh S.-W.; Kosaka Y.; An S.-I.
发表日期	2020
ISSN	0894-8755
起始页码	3809
结束页码	3825
卷号	33 期号:9
英文摘要	The North Pacific Oscillation (NPO), the second leading atmospheric mode in the North Pacific Ocean, is known to be responsible for climate variability and extremes in adjacent regions. The reproducibility of the NPO in climate models is thus a topic of interest for the more accurate prediction of climate extremes. By investigating the spatial characteristics of the NPO in models from phase 5 of the Coupled Model Intercomparison Project (CMIP5), this study reveals the intimate relationship between the NPO structure and the atmospheric mean states over the North Pacific. The majority of the models reasonably capture the meridional contrast of pressure anomalies, but the detailed horizontal characteristics of the NPO are found to differ among the models. Diagnostic analysis of 30 climate models and long-term observations suggest that systematic bias in the mean atmospheric baroclinicity over the North Pacific crucially affects the horizontal shape and zonal position of the NPO. In the models in which the climatological continental trough over the western North Pacific extends farther to the east, the NPO tends to be simulated farther to the east, strengthening its impact on the downstream climate. In contrast, when the climatological continental trough is reduced in size toward the west, the growth of the NPO is limited to the west, and its influence is weakened downstream. This relationship can be understood via the altered available potential and kinetic energy conversions that feed the total energy of the NPO, primarily stemming from the difference in the mean horizontal temperature gradient and stretching deformation of the mean horizontal wind. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy
英文关键词	Atmospheric structure; Kinetic energy; Kinetics; Stretching; Atmospheric baroclinicity; Climate variability; Coupled Model Intercomparison Project; Horizontal temperature gradient; Long term observations; North Pacific Ocean; Spatial characteristics; Western North Pacific; Climate models; climate change; climate modeling; climate prediction; CMIP; kinetic energy; numerical model; weather forecasting; 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/171332
作者单位	Yonsei University, Seoul, South Korea; Ewha Womans University, Seoul, South Korea; Hanyang University, ERICA, Ansan, South Korea; University of Tokyo, Tokyo, Japan
推荐引用方式 GB/T 7714	Sung M.-K.,Yoo C.,Yeh S.-W.,et al. Characteristics of the North pacific oscillation in CMIP5 models in relation to atmospheric mean states[J],2020,33(9).
APA	Sung M.-K.,Yoo C.,Yeh S.-W.,Kosaka Y.,&An S.-I..(2020).Characteristics of the North pacific oscillation in CMIP5 models in relation to atmospheric mean states.Journal of Climate,33(9).
MLA	Sung M.-K.,et al."Characteristics of the North pacific oscillation in CMIP5 models in relation to atmospheric mean states".Journal of Climate 33.9(2020).