Articles | Volume 21, issue 1
https://doi.org/10.5194/acp-21-217-2021
https://doi.org/10.5194/acp-21-217-2021
Research article
 | 
12 Jan 2021
Research article |  | 12 Jan 2021

A mass-weighted isentropic coordinate for mapping chemical tracers and computing atmospheric inventories

Yuming Jin, Ralph F. Keeling, Eric J. Morgan, Eric Ray, Nicholas C. Parazoo, and Britton B. Stephens

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Latest update: 25 Feb 2024
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Short summary
We propose a new atmospheric coordinate (Mθe) based on equivalent potential temperature (θe) but with mass as the unit. This coordinate is useful in studying the spatial and temporal distribution of long-lived chemical tracers (CO2, CH4, O2 / N2, etc.) from sparse data, like airborne observation. Using this coordinate and sparse airborne observation (HIPPO and ATom), we resolve the Northern Hemisphere mass-weighted average CO2 seasonal cycle with high accuracy.
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