Recent Decreases in the Growth Rate of Atmospheric HCFC-22 Column Derived From the Ground-Based FTIR Harmonized Retrievals at 16 NDACC Sites
Artikel i vetenskaplig tidskrift, 2024
HCFC-22 is an ozone-depleting substance with a greenhouse effect. The atmospheric mole fractions of HCFC-22 have been increasing since the 1950s. Within the NDACC-IRWG network, HCFC-22 mol fractions can be retrieved from solar absorption spectra measured by ground-based FTIR. However, only a few sites have provided HCFC-22 data sets. Here, we demonstrate a harmonized FTIR HCFC-22 retrieval strategy and generate a new global NDACC-IRWG HCFC-22 data set at 16 FTIR sites. The systematic and random uncertainties are 5.3%–8.7% and 3.2%–8.0%, respectively. A maximum HCFC-22 column annual growth rate was observed in 2009 with a mean of 7.65 ± 1.39 ppt/year, and the HCFC-22 annual growth rate decreased to 3.57 ± 1.39 ppt/year (2016–2020) and 2.15 ± 2.09 ppt/year (2021–2023). The annual growth rates derived from the FTIR measurements are compared to the ones derived from NOAA surface flask samplings and ACE-FTS satellite measurements, and the three independent data sets show a good agreement.
Författare
Minqiang Zhou
Belgian Institute for Space Aeronomy (BIRA-IASB)
Chinese Academy of Sciences
Bavo Langerock
Belgian Institute for Space Aeronomy (BIRA-IASB)
C. Vigouroux
Belgian Institute for Space Aeronomy (BIRA-IASB)
Dan Smale
National Institute of Water and Atmospheric Research (NIWA)
G. Toon
California Institute of Technology (Caltech)
Alexander Polyakov
Saint Petersburg State University - Spsu
J. W. Hannigan
National Center for Atmospheric Research
Johan Mellqvist
Chalmers, Rymd-, geo- och miljövetenskap, Geovetenskap och fjärranalys
John Robinson
National Institute of Water and Atmospheric Research (NIWA)
J. Notholt
Universität Bremen
K. Strong
University of Toronto
E. Mahieu
Universite de Liège
Mathias Palm
Universität Bremen
Maxime Prignon
Chalmers, Rymd-, geo- och miljövetenskap, Geovetenskap och fjärranalys
N. Jones
University of Wollongong
O. Garcia
Meteorological State Agency of Spain (AEMET)
Isamu Morino
National Institute for Environmental Studies of Japan
Isao Murata
Tohoku University
Ivan Ortega
National Center for Atmospheric Research
Tomoo Nagahama
Nagoya University
Tyler Wizenberg
University of Toronto
Victoria A. Flood
University of Toronto
K.A. Walker
University of Toronto
M. De Maziere
Belgian Institute for Space Aeronomy (BIRA-IASB)
Geophysical Research Letters
0094-8276 (ISSN) 19448007 (eISSN)
Vol. 51 22 e2024GL112470Ämneskategorier
Geovetenskap och miljövetenskap
DOI
10.1029/2024GL112470