气候变化领域集成服务门户(CCPortal): Evaluating Stratospheric Tropical Width Using Tracer Concentrations

CCPortal

DOI	10.1029/2020JD033081
	Evaluating Stratospheric Tropical Width Using Tracer Concentrations
	Shah K.S.; Solomon S.; Thompson D.W.J.; Kinnison D.E.
发表日期	2020
ISSN	2169897X
卷号	125 期号:21
英文摘要	Quantifying the width of the tropics has important implications for understanding climate variability and the atmospheric response to anthropogenic forcing. Considerable effort has been placed on quantifying the width of the tropics at tropospheric levels, but substantially less effort has been placed on quantifying the width at stratospheric levels. Here we probe tropical width in the stratosphere using chemical tracers, which are accessible by direct measurement. Two new tracer-based width metrics are developed, denoted here as the “1σ method” and the gradient weighted latitude (GWL) method. We evaluate widths from three tracers, CH4, N2O, and SF6. We demonstrate that unlike previously proposed stratospheric width methods using tracers, these metrics perform consistently throughout the depth of the stratosphere, at all times of year and on coarse temporal data. The GWL tracer-based widths correlate well with the turnaround latitude and the critical level, where wave dissipation occurs, in the upper and midstratosphere during certain months of the year. In the lower stratosphere, the deseasonalized tracer-based widths near the tropical tropopause correlate with the deseasonalized tropopause-height based metrics. We also find that tracer-tracer width correlations are strongest at pressure levels where their chemical lifetimes are similar. These metrics represent another useful way to estimate stratospheric tropical width and explore any changes under anthropogenic forcing. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185676
作者单位	Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Shah K.S.,Solomon S.,Thompson D.W.J.,et al. Evaluating Stratospheric Tropical Width Using Tracer Concentrations[J],2020,125(21).
APA	Shah K.S.,Solomon S.,Thompson D.W.J.,&Kinnison D.E..(2020).Evaluating Stratospheric Tropical Width Using Tracer Concentrations.Journal of Geophysical Research: Atmospheres,125(21).
MLA	Shah K.S.,et al."Evaluating Stratospheric Tropical Width Using Tracer Concentrations".Journal of Geophysical Research: Atmospheres 125.21(2020).