气候变化领域集成服务门户(CCPortal): A mass-weighted isentropic coordinate for mapping chemical tracers and computing atmospheric inventories

CCPortal

DOI	10.5194/acp-21-217-2021
	A mass-weighted isentropic coordinate for mapping chemical tracers and computing atmospheric inventories
	Jin Y.; Keeling R.F.; Morgan E.J.; Ray E.; Parazoo N.C.; Stephens B.B.
发表日期	2021
ISSN	1680-7316
起始页码	217
结束页码	238
卷号	21 期号:1
英文摘要	We introduce a transformed isentropic coordinate Mθe, defined as the dry air mass under a given equivalent potential temperature surface (θe) within a hemisphere. Like θe, the coordinate Mθefollows the synoptic distortions of the atmosphere but, unlike θe, has a nearly fixed relationship with latitude and altitude over the seasonal cycle. Calculation of Mθeis straightforward from meteorological fields. Using observations from the recent HIAPER Pole-to-Pole Observations (HIPPO) and Atmospheric Tomography Mission (ATom) airborne campaigns, we map the CO2seasonal cycle as a function of pressure and Mθe, where Mθeis thereby effectively used as an alternative to latitude. We show that the CO2seasonal cycles are more constant as a function of pressure using Mθeas the horizontal coordinate compared to latitude. Furthermore, short-term variability in CO2relative to the mean seasonal cycle is also smaller when the data are organized by Mθeand pressure than when organized by latitude and pressure. We also present a method using Mθeto compute mass-weighted averages of CO2on a hemispheric scale. Using this method with the same airborne data and applying corrections for limited coverage, we resolve the average CO2seasonal cycle in the Northern Hemisphere (mass-weighted tropospheric climatological average for 2009-2018), yielding an amplitude of 7.8±0.14 ppm and a downward zerocrossing on Julian day 173±6.1 (i.e., late June).Mθemay be similarly useful for mapping the distribution and computing inventories of any long-lived chemical tracer. © 2021 American Institute of Physics Inc.. All rights reserved.
英文关键词	air mass; atmospheric chemistry; carbon dioxide; coordinate; inventory; mapping; Northern Hemisphere; potential temperature; synoptic meteorology; tracer
语种	英语
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/168846
作者单位	Scripps Institution of Oceanography, University of California San Diego, San diego, CA 92093, United States; National Oceanic and Atmospheric Administration, Boulder, CO 80305, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States; National Center for Atmospheric Research, Boulder, CO 80301, United States
推荐引用方式 GB/T 7714	Jin Y.,Keeling R.F.,Morgan E.J.,et al. A mass-weighted isentropic coordinate for mapping chemical tracers and computing atmospheric inventories[J],2021,21(1).
APA	Jin Y.,Keeling R.F.,Morgan E.J.,Ray E.,Parazoo N.C.,&Stephens B.B..(2021).A mass-weighted isentropic coordinate for mapping chemical tracers and computing atmospheric inventories.Atmospheric Chemistry and Physics,21(1).
MLA	Jin Y.,et al."A mass-weighted isentropic coordinate for mapping chemical tracers and computing atmospheric inventories".Atmospheric Chemistry and Physics 21.1(2021).