Zobrazeno 1 - 10
of 863
pro vyhledávání: '"J. B. McManus"'
Publikováno v:
Atmospheric Measurement Techniques, Vol 16, Pp 1915-1921 (2023)
An Aerodyne tunable infrared laser direct absorption spectrometer with a multipass cell with a 413 m pathlength for the detection of ethylene oxide (EtO) is presented (TILDAS-FD-EtO). This monitor achieves precisions of ppt or ppb s−1 and ppt in 10
Externí odkaz:
https://doaj.org/article/fe5af7db3ac04b758b97574c60bcc09b
Autor:
Y. Gonzalez, R. Commane, E. Manninen, B. C. Daube, L. D. Schiferl, J. B. McManus, K. McKain, E. J. Hintsa, J. W. Elkins, S. A. Montzka, C. Sweeney, F. Moore, J. L. Jimenez, P. Campuzano Jost, T. B. Ryerson, I. Bourgeois, J. Peischl, C. R. Thompson, E. Ray, P. O. Wennberg, J. Crounse, M. Kim, H. M. Allen, P. A. Newman, B. B. Stephens, E. C. Apel, R. S. Hornbrook, B. A. Nault, E. Morgan, S. C. Wofsy
Publikováno v:
Atmospheric Chemistry and Physics, Vol 21, Pp 11113-11132 (2021)
We measured the global distribution of tropospheric N2O mixing ratios during the NASA airborne Atmospheric Tomography (ATom) mission. ATom measured concentrations of ∼ 300 gas species and aerosol properties in 647 vertical profiles spanning the Pac
Externí odkaz:
https://doaj.org/article/31481aace19749b9945229df648b2b2a
Publikováno v:
Atmospheric Measurement Techniques, Vol 14, Pp 4279-4304 (2021)
Using laser absorption spectrometry for the measurement of stable isotopes of atmospheric CO2 instead of the traditional isotope ratio mass spectrometry method decreases sample preparation time significantly, and uncertainties in the measurement accu
Externí odkaz:
https://doaj.org/article/8e4703af046e469593d9afde3eb376a4
Autor:
R. Wehr, R. Commane, J. W. Munger, J. B. McManus, D. D. Nelson, M. S. Zahniser, S. R. Saleska, S. C. Wofsy
Publikováno v:
Biogeosciences, Vol 14, Iss 2, Pp 389-401 (2017)
Stomatal conductance influences both photosynthesis and transpiration, thereby coupling the carbon and water cycles and affecting surface–atmosphere energy exchange. The environmental response of stomatal conductance has been measured mainly on the
Externí odkaz:
https://doaj.org/article/976b9edb3b964a699248b15b24623fbc
Autor:
J. B. McManus, C. R. Weber
Publikováno v:
Australian Journal of Earth Sciences. 69:825-843
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::917a85243d26fd9cd8812120da61dc90
https://doi.org/10.1080/08120099.2022.2058609
https://doi.org/10.1080/08120099.2022.2058609
Autor:
C. Dyroff, S. Sanati, E. Christner, A. Zahn, M. Balzer, H. Bouquet, J. B. McManus, Y. González-Ramos, M. Schneider
Publikováno v:
Atmospheric Measurement Techniques, Vol 8, Iss 5, Pp 2037-2049 (2015)
Vertical profiles of water vapor (H2O) and its isotope ratio D / H expressed as δD(H2O) were measured in situ by the ISOWAT II diode-laser spectrometer during the MUlti-platform remote Sensing of Isotopologues for investigating the Cycle of Atmosphe
Externí odkaz:
https://doaj.org/article/7987e69d12b442a7ae70a5a37dbcd5ac
Publikováno v:
Atmospheric Measurement Techniques, Vol 7, Iss 12, Pp 4445-4453 (2014)
We present field test results for a new spectroscopic instrument to measure atmospheric carbon dioxide (CO2) with high precision (0.02 μmol mol−1, or ppm at 1 Hz) and demonstrate high stability (within 0.1 ppm over more than 8 months), without the
Externí odkaz:
https://doaj.org/article/daf4118b1a7b40a69dab143d17d36a10
Autor:
G. W. Santoni, B. C. Daube, E. A. Kort, R. Jiménez, S. Park, J. V. Pittman, E. Gottlieb, B. Xiang, M. S. Zahniser, D. D. Nelson, J. B. McManus, J. Peischl, T. B. Ryerson, J. S. Holloway, A. E. Andrews, C. Sweeney, B. Hall, E. J. Hintsa, F. L. Moore, J. W. Elkins, D. F. Hurst, B. B. Stephens, J. Bent, S. C. Wofsy
Publikováno v:
Atmospheric Measurement Techniques, Vol 7, Iss 6, Pp 1509-1526 (2014)
We present an evaluation of aircraft observations of the carbon and greenhouse gases CO2, CH4, N2O, and CO using a direct-absorption pulsed quantum cascade laser spectrometer (QCLS) operated during the HIPPO and CalNex airborne experiments. The QCLS
Externí odkaz:
https://doaj.org/article/3c547045150e4fc2b8f5124ab82a924e
Publikováno v:
Atmospheric Measurement Techniques, Vol 6, Iss 7, Pp 1611-1621 (2013)
We present a novel spectral method to measure atmospheric carbon dioxide (CO2) with high precision and stability without resorting to calibration tanks during long-term operation. This spectral null method improves precision by reducing spectral prop
Externí odkaz:
https://doaj.org/article/81ec5fb2e6fd45bfb98c4a67ddc19ebb
Autor:
B. Tuzson, K. Zeyer, M. Steinbacher, J. B. McManus, D. D. Nelson, M. S. Zahniser, L. Emmenegger
Publikováno v:
Atmospheric Measurement Techniques, Vol 6, Iss 4, Pp 927-936 (2013)
A quantum cascade laser based absorption spectrometer for continuous and direct measurements of NO and NO2 was employed at the high-altitude monitoring site Jungfraujoch (3580 m a.s.l., Switzerland) during a three-month campaign in spring/summer 2012
Externí odkaz:
https://doaj.org/article/47a02c08c27a4c18a987e055b3e85cdc