Free-troposphere ozone and carbon monoxide over the North Atlantic for 2001–2011
In situ measurements of carbon monoxide (CO) and ozone (O<sub>3</sub>) at the Pico Mountain Observatory (PMO) located in the Azores, Portugal, are analyzed together with results from an atmospheric chemical transport model (GEOS-Chem) and satellite remote sensing data (AIRS (Atmospheric...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2013-12-01
|
| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/13/12537/2013/acp-13-12537-2013.pdf |
| _version_ | 1828761316414717952 |
|---|---|
| author | A. Kumar S. Wu M. F. Weise R. Honrath R. C. Owen D. Helmig L. Kramer M. Val Martin Q. Li |
| author_facet | A. Kumar S. Wu M. F. Weise R. Honrath R. C. Owen D. Helmig L. Kramer M. Val Martin Q. Li |
| author_sort | A. Kumar |
| collection | DOAJ |
| description | In situ measurements of carbon monoxide (CO) and ozone (O<sub>3</sub>) at the Pico
Mountain Observatory (PMO) located in the Azores, Portugal, are analyzed
together with results from an atmospheric chemical transport model
(GEOS-Chem) and satellite remote sensing data (AIRS (Atmospheric Infrared Sounder)
for CO, and TES (Tropospheric Emission Spectrometer) for
O<sub>3</sub>) to examine the evolution of free-troposphere CO and O<sub>3</sub> over the
North Atlantic for 2001–2011. GEOS-Chem captured the seasonal cycles for CO
and O<sub>3</sub> well but significantly underestimated the mixing ratios of CO,
particularly in spring. Statistically significant (using a significance level
of 0.05) decreasing trends were found for both CO and O<sub>3</sub> based on
harmonic regression analysis of the measurement data. The best estimates of
the possible trends for CO and O<sub>3</sub> measurements are −0.31 ± 0.30
(2-σ) ppbv yr<sup>−1</sup> and −0.21 ± 0.11
(2-σ) ppbv yr<sup>−1</sup>, respectively. Similar decreasing trends for
both species were obtained with GEOS-Chem simulation results. The most
important factor contributing to the decreases in CO and O<sub>3</sub> at PMO over
the past decade is the decline in anthropogenic emissions from North America,
which more than compensate for the impacts from increasing Asian emissions. It is
likely that climate change in the past decade has also affected the
intercontinental transport of O<sub>3</sub>. |
| first_indexed | 2024-12-11T01:28:39Z |
| format | Article |
| id | doaj.art-f1e0071a53b24141bdc97ab2698d219a |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-11T01:28:39Z |
| publishDate | 2013-12-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-f1e0071a53b24141bdc97ab2698d219a2022-12-22T01:25:27ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242013-12-011324125371254710.5194/acp-13-12537-2013Free-troposphere ozone and carbon monoxide over the North Atlantic for 2001–2011A. Kumar0S. Wu1M. F. Weise2R. Honrath3R. C. Owen4D. Helmig5L. Kramer6M. Val Martin7Q. Li8Department of Civil & Environmental Engineering, Michigan Technological University, Houghton, Michigan, USADepartment of Civil & Environmental Engineering, Michigan Technological University, Houghton, Michigan, USADepartment of Civil & Environmental Engineering, Michigan Technological University, Houghton, Michigan, USADepartment of Civil & Environmental Engineering, Michigan Technological University, Houghton, Michigan, USAUS EPA, Research Triangle Park, North Carolina, USAInstitute of Alpine and Arctic Research, University of Colorado at Boulder, Boulder, Colorado, USADepartment of Geological and Mining Engineering and Sciences, Michigan Technological University, Houghton, Michigan, USADepartment of Atmospheric Sciences, Colorado State University, Fort Collins, Colorado, USADepartment of Atmospheric {&} Oceanic Sciences, University of California Los Angeles, Los Angeles, California, USAIn situ measurements of carbon monoxide (CO) and ozone (O<sub>3</sub>) at the Pico Mountain Observatory (PMO) located in the Azores, Portugal, are analyzed together with results from an atmospheric chemical transport model (GEOS-Chem) and satellite remote sensing data (AIRS (Atmospheric Infrared Sounder) for CO, and TES (Tropospheric Emission Spectrometer) for O<sub>3</sub>) to examine the evolution of free-troposphere CO and O<sub>3</sub> over the North Atlantic for 2001–2011. GEOS-Chem captured the seasonal cycles for CO and O<sub>3</sub> well but significantly underestimated the mixing ratios of CO, particularly in spring. Statistically significant (using a significance level of 0.05) decreasing trends were found for both CO and O<sub>3</sub> based on harmonic regression analysis of the measurement data. The best estimates of the possible trends for CO and O<sub>3</sub> measurements are −0.31 ± 0.30 (2-σ) ppbv yr<sup>−1</sup> and −0.21 ± 0.11 (2-σ) ppbv yr<sup>−1</sup>, respectively. Similar decreasing trends for both species were obtained with GEOS-Chem simulation results. The most important factor contributing to the decreases in CO and O<sub>3</sub> at PMO over the past decade is the decline in anthropogenic emissions from North America, which more than compensate for the impacts from increasing Asian emissions. It is likely that climate change in the past decade has also affected the intercontinental transport of O<sub>3</sub>.http://www.atmos-chem-phys.net/13/12537/2013/acp-13-12537-2013.pdf |
| spellingShingle | A. Kumar S. Wu M. F. Weise R. Honrath R. C. Owen D. Helmig L. Kramer M. Val Martin Q. Li Free-troposphere ozone and carbon monoxide over the North Atlantic for 2001–2011 Atmospheric Chemistry and Physics |
| title | Free-troposphere ozone and carbon monoxide over the North Atlantic for 2001–2011 |
| title_full | Free-troposphere ozone and carbon monoxide over the North Atlantic for 2001–2011 |
| title_fullStr | Free-troposphere ozone and carbon monoxide over the North Atlantic for 2001–2011 |
| title_full_unstemmed | Free-troposphere ozone and carbon monoxide over the North Atlantic for 2001–2011 |
| title_short | Free-troposphere ozone and carbon monoxide over the North Atlantic for 2001–2011 |
| title_sort | free troposphere ozone and carbon monoxide over the north atlantic for 2001 2011 |
| url | http://www.atmos-chem-phys.net/13/12537/2013/acp-13-12537-2013.pdf |
| work_keys_str_mv | AT akumar freetroposphereozoneandcarbonmonoxideoverthenorthatlanticfor20012011 AT swu freetroposphereozoneandcarbonmonoxideoverthenorthatlanticfor20012011 AT mfweise freetroposphereozoneandcarbonmonoxideoverthenorthatlanticfor20012011 AT rhonrath freetroposphereozoneandcarbonmonoxideoverthenorthatlanticfor20012011 AT rcowen freetroposphereozoneandcarbonmonoxideoverthenorthatlanticfor20012011 AT dhelmig freetroposphereozoneandcarbonmonoxideoverthenorthatlanticfor20012011 AT lkramer freetroposphereozoneandcarbonmonoxideoverthenorthatlanticfor20012011 AT mvalmartin freetroposphereozoneandcarbonmonoxideoverthenorthatlanticfor20012011 AT qli freetroposphereozoneandcarbonmonoxideoverthenorthatlanticfor20012011 |