气候变化领域集成服务门户(CCPortal): Seasonal and CO2-induced shifts of the ITCZ: Testing energetic controls in idealized simulations with comprehensive models

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DOI	10.1175/JCLI-D-19-0602.1
	Seasonal and CO2-induced shifts of the ITCZ: Testing energetic controls in idealized simulations with comprehensive models
	Biasutti M.; Voigt A.
发表日期	2020
ISSN	0894-8755
起始页码	2853
结束页码	2870
卷号	33 期号:7
英文摘要	The Tropical Rain Belts with an Annual Cycle and Continent Model Intercomparison Project (TRACMIP) ensemble-a multimodel ensemble of slab-ocean simulations in idealized configurations-provides a test of the relationship between the zonal mean ITCZ and the cross-equatorial atmospheric energy transports (AHTeq). In a gross sense, the ITCZ position is linearly related to AHTeq, as expected from the energetic framework. Yet, in many aspects, the TRACMIP model simulations do not conform to the framework. Throughout the annual cycle there are large excursions in the ITCZ position unrelated to changes in the AHTeq and, conversely, substantial variations in the magnitude of the AHTeq while the ITCZ is stationary at its northernmost position. Variations both in the net vertical energy input at the ITCZ location and in the vertical profile of ascent play a role in setting the model behavior apart from the conceptual framework. Nevertheless, a linear fit to the ITCZ-AHTeq relationship captures a substantial fraction of the seasonal variations in these quantities as well as the intermodel or across-climate variations in their annual mean values. The slope of the ITCZ-AHTeq linear fit for annual mean changes across simulations with different forcings and configurations varies in magnitude and even sign from model to model and we identify variations in the vertical profile of ascent as a key factor. A simple sea surface temperature-based index avoids the complication of changes in the vertical structure of the atmospheric circulation and provides a more reliable diagnostic for the ITCZ position. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Oceanography; Surface waters; Atmospheric circulation; Comprehensive model; Conceptual frameworks; Model inter comparisons; Multi-model ensemble; Sea surface temperature (SST); Substantial variations; Vertical structures; Atmospheric structure; atmospheric circulation; atmospheric structure; atmospheric transport; carbon dioxide; climate forcing; climate modeling; climate variation; computer simulation; energetics; ensemble forecasting; intertropical convergence zone; numerical model; reliability analysis; sea surface temperature; seasonal variation; vertical profile
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/171369
作者单位	Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Institute of Meteorology and Climate Research-Department Troposphere Research, Karlsruhe Institute of Technology, Karlsruhe, Germany
推荐引用方式 GB/T 7714	Biasutti M.,Voigt A.. Seasonal and CO2-induced shifts of the ITCZ: Testing energetic controls in idealized simulations with comprehensive models[J],2020,33(7).
APA	Biasutti M.,&Voigt A..(2020).Seasonal and CO2-induced shifts of the ITCZ: Testing energetic controls in idealized simulations with comprehensive models.Journal of Climate,33(7).
MLA	Biasutti M.,et al."Seasonal and CO2-induced shifts of the ITCZ: Testing energetic controls in idealized simulations with comprehensive models".Journal of Climate 33.7(2020).