edu.ucar.opensky::articles:24116 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T06:36:55.494382 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d75d8w7r https://doi.org/10.17871/CarboScope-s04oc_v4.3 https Related Dataset #1 Jena CarboScope: Atmospheric CO2 inversion https://doi.org/10.25925/20190812 https Related Dataset #2 Multi-laboratory compilation of atmospheric carbon dioxide data for the period 1957-2018; obspack_co2_1_GLOBALVIEWplus_v5.0_2019_08_12 https://doi.org/10.3334/CDIAC/HIPPO_010 https Related Dataset #3 HIPPO Merged 10-Second Meteorology, Atmospheric Chemistry, and Aerosol Data. Version 1.0 https://doi.org/10.3334/CDIAC/HIPPO_014 https Related Dataset #4 HIPPO MEDUSA Flask Sample Trace Gas And Isotope Data. Version 1.0 https://doi.org/10.3334/ORNLDAAC/1581 https Related Dataset #5 ATom: Merged Atmospheric Chemistry, Trace Gases, and Aerosols https://doi.org/10.3334/ORNLDAAC/1597 https Related Dataset #6 ATom: Simulated Data Stream for Modeling ATom-like Measurements https://doi.org/10.5281/zenodo.4420398 https Related Dataset #7 θ-Mθe Lookup Table (ERA-Interim) https://doi.org/10.5281/zenodo.4420417 https Related Software #1 yumingjin0521/Mthetae: θ-Mθe Lookup Table Computation Method A mass-weighted isentropic coordinate for mapping chemical tracers and computing atmospheric inventories 2021-01-12T00:00:00Z publication https://n2t.org/ark:/85065/d75d8w7r https://doi.org/10.5194/acp-21-217-2021 Jin, Y. author Keeling, R. F. author Morgan, E. J. author Ray, E. author Parazoo, N. C. author Stephens, Britton author UCAR/NCAR - Library publisher We introduce a transformed isentropic coordinate M theta(e), defined as the dry air mass under a given equivalent potential temperature surface (theta(e)) within a hemisphere. Like theta(e), the coordinate M-theta e follows the synoptic distortions of the atmosphere but, unlike theta(e), has a nearly fixed relationship with latitude and altitude over the seasonal cycle. Calculation of M-theta e is 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 CO2 seasonal cycle as a function of pressure and M-theta e, where M-theta e is thereby effectively used as an alternative to latitude. We show that the CO2 seasonal cycles are more constant as a function of pressure using Moe as the horizontal coordinate compared to latitude. Furthermore, short-term variability in CO2 relative to the mean seasonal cycle is also smaller when the data are organized by M-theta e and pressure than when organized by latitude and pressure. We also present a method using M-theta e to compute mass-weighted averages of CO2 on a hemispheric scale. Using this method with the same airborne data and applying corrections for limited coverage, we resolve the average CO2 seasonal 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). M-theta e may be similarly useful for mapping the distribution and computing inventories of any long-lived chemical tracer. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. None eng geoscientificInformation