With 46 molecules in the current ACE version 5 dataset, more data products than any other satellite instrument, ACE is often used to determine atmospheric composition. Not included in this dataset are the following research products: C2H4 (Dodangodage et al., 2025), HFC-125 (Dodangodage et al., 2025), an updated version of HFC-23 (Dodangodage et al., 2025), and an updated version of line-of-sight winds (Wyatt et al., submitted).
Trends for v5.2 ACE molecules
Global distribution maps and trends for each molecule can be viewed by clicking the molecule name in the table below.
Any use of the v5.2 trend figures or values must reference the following paper:
M. Schmidt, P. Bernath, C. Boone, M. Lecours, and J. Steffen. Trends in atmospheric composition between 2004–2023 using version 5 ACE-FTS data, J. Quant. Spectrosc. Rad. Transfer, 325 (2024) 109088; doi:10.1016/j.jqsrt.2024.109088
Linear trend values of all ACE molecules
Linear trend values of 46 ACE-FTS molecules in %/year and ppt/year from are presented below. The most recent trend is shown, unless anomalous (denoted by *), in which the next most recent trend is used. Errors are reported in parentheses as 1 standard deviation on the last digit.
|
Molecule |
Trend %/year (error) |
Trend ppt/year (error) |
Molecule | Trend %/year (error) |
Trend ppt/year (error) |
|---|---|---|---|---|---|
| C2H2 | -1.4(2) | -1.7(3) | HCFC-141b | -0.6(1) | -0.14(3) |
| C2H6 | 0.7(2) | 7.1(1.7) | HCFC-142b | 0.02(2) | 0.09(9) |
| C3H6O | 2.2(2) | 6.7(6) | HCl | -0.33(1) | -8.6(3) |
| CCl4 | -1.04(2) | -0.88(2) | HCN | -0.2(2) | -0.5(4) |
| CF4 | 1.08(1) | 0.930(9) | HCOOH | -0.8(2) | -0.31(7) |
| CFC-11 | -0.93(3) | -2.12(6) | HF* | 0.80(4) | 15.6(7) |
| CFC-12 | -0.61(1) | -3.16(4) | HFC-23 | 3.24(4) | 0.84(1) |
| CFC-113 | -1.57(5) | -1.03(3) | HFC-32 | 14.1(6) | 2.99(5) |
| CH3Cl | 0.16(4) | 0.8(2) | HFC-134a | 6.00(8) | 5.72(6) |
| CH3CN | -0.5(1) | -1.4(4) | HNO3 | 0.2(2) | 10(10) |
| CH3OH | 0.1(1) | 0.8(7) | HO2NO2 | 0.14(8) | 0.4(2) |
| CH4 | 0.80(5) | 15.1(9)\(\times\)103 | HOCl | -0.07(8) | -0.09(11) |
| ClO | 0.3(3) | 1.1(1.1) | N2 | 0.004(3) | 30(20)\(\times\)106 |
| ClONO2 | -0.47(7) | -4.0(6) | N2O | 0.285(6) | 0.95(2)\(\times\)103 |
| CO | -0.3(1) | -0.20(7)\(\times\)103 | N2O5 | 0.1(1) | 1.2(1.5) |
| CO2 | 0.550(2) | 2.25(1)\(\times\)106 | NO | 0.07(12) | 5.5(8.9) |
| COCl2 | -0.52(9) | -0.06(1) | NO2 | 0.04(8) | 1.9(3.6) |
| COClF | -0.7(1) | -0.36(5) | O2 | 0.038(5) | 80(10)\(\times\)106 |
| COF2 | 0.34(8) | 1.0(2) | O3 | 0.20(4) | 14(2)\(\times\)103 |
| H2CO | 0.1(1) | 0.1(1) | OCS | -0.98(7) | -4.5(3) |
| H2O* | 0.22(2) | 12(1)\(\times\)103 | PAN | -8.4(6) | -3.8(2) |
| H2O2 | 0.4(2) | 0.8(4) | SF6 | 3.67(2) | 0.342(2) |
| HCFC-22 | 0.40(8) | 1.0(2) | SO2 | 0.4(2) | 0.05(2) |
