The Total Carbon Column Observing Network (TCCON) is a collaborative effort led by Debra Wunch, involving several researchers and partners. The network provides advanced data and algorithms for measuring and analyzing atmospheric trace gases, particularly carbon dioxide (CO₂) and methane (CH₄). Key components of TCCON include: - **Latest Version of Retrievals**: GGG2020, which is the latest version of the data retrieval algorithm. - **A Priori Profiles**: Developed by Laughner et al., these profiles are used to generate initial conditions for the GGG2020 retrieval algorithm. - **Data Archive**: The TCCON data archive is accessible at <https://tccondata.org>. TCCON plays a crucial role in supporting global greenhouse gas (GHG) satellite missions by providing high-quality data and advanced methodologies for monitoring CO₂ and CH₄ concentrations. For more information, contact dwunch@atmosp.physics.utoronto.ca.The Total Carbon Column Observing Network (TCCON) is a collaborative effort led by Debra Wunch, involving several researchers and partners. The network provides advanced data and algorithms for measuring and analyzing atmospheric trace gases, particularly carbon dioxide (CO₂) and methane (CH₄). Key components of TCCON include: - **Latest Version of Retrievals**: GGG2020, which is the latest version of the data retrieval algorithm. - **A Priori Profiles**: Developed by Laughner et al., these profiles are used to generate initial conditions for the GGG2020 retrieval algorithm. - **Data Archive**: The TCCON data archive is accessible at <https://tccondata.org>. TCCON plays a crucial role in supporting global greenhouse gas (GHG) satellite missions by providing high-quality data and advanced methodologies for monitoring CO₂ and CH₄ concentrations. For more information, contact dwunch@atmosp.physics.utoronto.ca.