Zobrazeno 1 - 10
of 65
pro vyhledávání: '"W R Simpson"'
Autor:
H. Chong, G. González Abad, C. R. Nowlan, C. Chan Miller, A. Saiz-Lopez, R. P. Fernandez, H.-A. Kwon, Z. Ayazpour, H. Wang, A. H. Souri, X. Liu, K. Chance, E. O'Sullivan, J. Kim, J.-H. Koo, W. R. Simpson, F. Hendrick, R. Querel, G. Jaross, C. Seftor, R. M. Suleiman
Publikováno v:
Atmospheric Measurement Techniques, Vol 17, Pp 2873-2916 (2024)
Quantifying the global bromine monoxide (BrO) budget is essential to understand ozone chemistry better. In particular, the tropospheric BrO budget has not been well characterized. Here, we retrieve nearly a decade (February 2012–July 2021) of strat
Externí odkaz:
https://doaj.org/article/d51cb51bb7014304bfe27ff044d107e9
Autor:
N. Brockway, P. K. Peterson, K. Bigge, K. D. Hajny, P. B. Shepson, K. A. Pratt, J. D. Fuentes, T. Starn, R. Kaeser, B. H. Stirm, W. R. Simpson
Publikováno v:
Atmospheric Chemistry and Physics, Vol 24, Pp 23-40 (2024)
Reactive halogen chemistry in the springtime Arctic causes ozone depletion events and alters the rate of pollution processing. There are still many uncertainties regarding this chemistry, including the multiphase recycling of halogens and how sea ice
Externí odkaz:
https://doaj.org/article/760993564a08400ba048cd5ff96edc66
Autor:
W. F. Swanson, C. D. Holmes, W. R. Simpson, K. Confer, L. Marelle, J. L. Thomas, L. Jaeglé, B. Alexander, S. Zhai, Q. Chen, X. Wang, T. Sherwen
Publikováno v:
Atmospheric Chemistry and Physics, Vol 22, Pp 14467-14488 (2022)
Reactive halogens play a prominent role in the atmospheric chemistry of the Arctic during springtime. Field measurements and modeling studies suggest that halogens are emitted into the atmosphere from snowpack and reactions on wind-blown snow-sourced
Externí odkaz:
https://doaj.org/article/a5bfa01731f744afb183b2320b89aeb4
Autor:
T. Zhao, J. Mao, W. R. Simpson, I. De Smedt, L. Zhu, T. F. Hanisco, G. M. Wolfe, J. M. St. Clair, G. González Abad, C. R. Nowlan, B. Barletta, S. Meinardi, D. R. Blake, E. C. Apel, R. S. Hornbrook
Publikováno v:
Atmospheric Chemistry and Physics, Vol 22, Pp 7163-7178 (2022)
Here we use satellite observations of formaldehyde (HCHO) vertical column densities (VCD) from the TROPOspheric Monitoring Instrument (TROPOMI), aircraft measurements, combined with a nested regional chemical transport model (GEOS-Chem at 0.5×0.625
Externí odkaz:
https://doaj.org/article/a9dabe1bb4e246918230534460ba7fb0
Spatial distributions of XCO2 seasonal cycle amplitude and phase over northern high-latitude regions
Autor:
N. Jacobs, W. R. Simpson, K. A. Graham, C. Holmes, F. Hase, T. Blumenstock, Q. Tu, M. Frey, M. K. Dubey, H. A. Parker, D. Wunch, R. Kivi, P. Heikkinen, J. Notholt, C. Petri, T. Warneke
Publikováno v:
Atmospheric Chemistry and Physics, Vol 21, Pp 16661-16687 (2021)
Satellite-based observations of atmospheric carbon dioxide (CO2) provide measurements in remote regions, such as the biologically sensitive but undersampled northern high latitudes, and are progressing toward true global data coverage. Recent improve
Externí odkaz:
https://doaj.org/article/67c6cb5bfe2b4d808e45094d0f5085aa
Autor:
N. Jacobs, W. R. Simpson, D. Wunch, C. W. O'Dell, G. B. Osterman, F. Hase, T. Blumenstock, Q. Tu, M. Frey, M. K. Dubey, H. A. Parker, R. Kivi, P. Heikkinen
Publikováno v:
Atmospheric Measurement Techniques, Vol 13, Pp 5033-5063 (2020)
Seasonal CO2 exchange in the boreal forest plays an important role in the global carbon budget and in driving interannual variability in seasonal cycles of atmospheric CO2. Satellite-based observations from polar orbiting satellites like the Orbiting
Externí odkaz:
https://doaj.org/article/617af36a00fc4d2191e5898a010855ae
Autor:
W. R. Simpson, P. K. Peterson, U. Frieß, H. Sihler, J. Lampel, U. Platt, C. Moore, K. Pratt, P. Shepson, J. Halfacre, S. V. Nghiem
Publikováno v:
Atmospheric Chemistry and Physics, Vol 17, Pp 9291-9309 (2017)
Heterogeneous photochemistry converts bromide (Br−) to reactive bromine species (Br atoms and bromine monoxide, BrO) that dominate Arctic springtime chemistry. This phenomenon has many impacts such as boundary-layer ozone depletion, mercury oxid
Externí odkaz:
https://doaj.org/article/1b1ef9c76b164af383e41ccca8adfdc5
Autor:
P. K. Peterson, D. Pöhler, H. Sihler, J. Zielcke, S. General, U. Frieß, U. Platt, W. R. Simpson, S. V. Nghiem, P. B. Shepson, B. H. Stirm, S. Dhaniyala, T. Wagner, D. R. Caulton, J. D. Fuentes, K. A. Pratt
Publikováno v:
Atmospheric Chemistry and Physics, Vol 17, Pp 7567-7579 (2017)
The return of sunlight in the polar spring leads to the production of reactive halogen species from the surface snowpack, significantly altering the chemical composition of the Arctic near-surface atmosphere and the fate of long-range transported p
Externí odkaz:
https://doaj.org/article/0fa9b84eda1d443ba8848bd7dc9cf192
Autor:
K. D. Custard, C. R. Thompson, K. A. Pratt, P B. Shepson, J. Liao, L. G. Huey, J. J. Orlando, A. J. Weinheimer, E. Apel, S. R. Hall, F. Flocke, L. Mauldin, R. S. Hornbrook, D. Pöhler, S. General, J. Zielcke, W. R. Simpson, U. Platt, A. Fried, P. Weibring, B. C. Sive, K. Ullmann, C. Cantrell, D. J. Knapp, D. D. Montzka
Publikováno v:
Atmospheric Chemistry and Physics, Vol 15, Iss 18, Pp 10799-10809 (2015)
Arctic boundary layer nitrogen oxides (NOx = NO2 + NO) are naturally produced in and released from the sunlit snowpack and range between 10 to 100 pptv in the remote background surface layer air. These nitrogen oxides have significant effects on the
Externí odkaz:
https://doaj.org/article/3d9f98ad387847a58d4121e7796f350b
Autor:
P. K. Peterson, W. R. Simpson, K. A. Pratt, P. B. Shepson, U. Frieß, J. Zielcke, U. Platt, S. J. Walsh, S. V. Nghiem
Publikováno v:
Atmospheric Chemistry and Physics, Vol 15, Iss 4, Pp 2119-2137 (2015)
Multiple axis differential absorption spectroscopy (MAX-DOAS) measurements of bromine monoxide (BrO) probed the vertical structure of halogen activation events during March–May 2012 at Barrow, Alaska. An analysis of the BrO averaging kernels and
Externí odkaz:
https://doaj.org/article/db76a69592d44fc7a92f50b959c9ef9e