Atmospheric data used for calibrating the tropopause in global chemistry-climate or chemistry-transport models

We divide the atmosphere into distinct spheres based on their physical, chemical, and dynamical traits.  In deriving chemical budgets and climate trends, which differ across spheres, we need clearly defined boundaries.  Focusing on atmospheric mass and greenhouse gases, our primary spheres are the troposphere and stratosphere (~99.9 % by mass), and the boundary between them is the tropopause. 
The standard method of locating the tropopause is based on the World Meteorological Organization’s lapse rate tropopause (LRT) defined from the vertical temperature gradient as observed by radiosonde balloons.  Every global climate-weather model has one or more methods to calculate the LRT. Both involve subjective choices: expert judgment given meter-scale variability of sonde temperature profiles; methods for calculating gradients from km-thick model layers. Further, LRT and similar methods are consistent only in regions where gradients are primarily vertical (core tropics and..., This dataset was collected from several sources as outlined in the table below
The CTM 4-D data is published in https://doi.org/10.5061/dryad.qbzkh18qq as netcdf files (CTRL data)

Table 1.  Observational data sets

type

source

files

profiles

dates

ozone sondes

Wallops (WAL, 38°N), SHADOZV06
Ascension (ASC, 8°S) SHADOZV06
Lauder (LAU, 45°S) NIWA

1,477
831
1,973

1,477/tot
831/tot
1,973/tot

1995-2020
1998-2022
1986-2021

 

downloaded:  .dat's 2023-10-03 (WAL & ASC); csv's 2023-01-08 (LAU)
processing:  see Table 3.

OMPS

OMPS-NPP_LP-L2-O3-DAILY_v2.6

3,587

~1,160/day

2014-2023

 

downloaded: 2023-04-01 via wget,
https://data.gesdisc.earthdata.nasa.gov/data/SNPP_OMPS_Level2/...
accepted profiles: 'O3Convergence' <10; ' O3Status' =2:7; ' O3Quality' =0;
'QMV' =0; 'ASI_PMCFlag' =0.
processing:  'TropopauseAltitude' reported using GMAO FP-IT T profiles

ACE-FTS

ACEFTS_L2_v4p0_O3.nc (includes O3, p, T)

1

..., , # **Tropopause data used for calibrating the tropopause in global chemistry-climate or chemistry-transport models**

[https://doi.org/10.5061/dryad.pk0p2ngzt](https://doi.org/10.5061/dryad.pk0p2ngzt)

**Description of the data and file structure**

The data here focus on tropopause and near-tropopause profiles of P, T, O3 and synthetic age-of-air tracers from sondes, satellites and the UCI chemistry-transport model (CTM).

**Files and variables**

**File: O3sonde_ASC2.nc**

**Description:**  Post-processed Ascension I. ozonesonde data. Cleaned to give a consistent ascent profile per text.

Format netcdf4\
Dimensions: Levels = 1600\
Sondes = 831\
Variables:\
SondeFile\
Size: 831x1\
Dimensions: Sondes\
Datatype: string\
Attributes:\
id = 'Ascension O3 sonde files used 19980102:20220928'\
rev = 'revised Nov 2024, version 2'\
YYYY\
Size: 831x1\
Dimensions: Sondes\
Datatype: int32\
Attributes:\
id = 'Year of sonde YYYY'\
MM\
Size: 831x1\
Dimensions: Sondes\
Datatype: int32\
Attributes:\
id =...,