Zobrazeno 1 - 10
of 339
pro vyhledávání: '"F Keeling"'
Autor:
J. L. Laughner, G. C. Toon, J. Mendonca, C. Petri, S. Roche, D. Wunch, J.-F. Blavier, D. W. T. Griffith, P. Heikkinen, R. F. Keeling, M. Kiel, R. Kivi, C. M. Roehl, B. B. Stephens, B. C. Baier, H. Chen, Y. Choi, N. M. Deutscher, J. P. DiGangi, J. Gross, B. Herkommer, P. Jeseck, T. Laemmel, X. Lan, E. McGee, K. McKain, J. Miller, I. Morino, J. Notholt, H. Ohyama, D. F. Pollard, M. Rettinger, H. Riris, C. Rousogenous, M. K. Sha, K. Shiomi, K. Strong, R. Sussmann, Y. Té, V. A. Velazco, S. C. Wofsy, M. Zhou, P. O. Wennberg
Publikováno v:
Earth System Science Data, Vol 16, Pp 2197-2260 (2024)
The Total Carbon Column Observing Network (TCCON) measures column-average mole fractions of several greenhouse gases (GHGs), beginning in 2004, from over 30 current or past measurement sites around the world using solar absorption spectroscopy in the
Externí odkaz:
https://doaj.org/article/f7c8ac9c19f04402af11e5fe7712405c
Publikováno v:
Canadian Journal of Gastroenterology, Vol 4, Iss 8, Pp 497-502 (1990)
A controlled prospective study was undertaken to determine the incidence and characteristic features of peripheral arthritis, sacroiliitis, ankylosing spondylitis and hypertrophic osteoarthropathy in a group of patients with Crohn's disease, and to d
Externí odkaz:
https://doaj.org/article/797a6768ff3b4e0a8c426a56524a5039
Autor:
C. Rödenbeck, K. E. Adcock, M. Eritt, M. Gachkivskyi, C. Gerbig, S. Hammer, A. Jordan, R. F. Keeling, I. Levin, F. Maier, A. C. Manning, H. Moossen, S. Munassar, P. A. Pickers, M. Rothe, Y. Tohjima, S. Zaehle
Publikováno v:
Atmospheric Chemistry and Physics, Vol 23, Pp 15767-15782 (2023)
Atmospheric measurements of the O2/N2 ratio and the CO2 mole fraction (combined into the conceptual tracer “Atmospheric Potential Oxygen”, APO) over continents have been proposed as a constraint on CO2 emissions from fossil-fuel burning. Here we
Externí odkaz:
https://doaj.org/article/da8c3384e1da43508a4e464ac3e6741a
Publikováno v:
Atmospheric Measurement Techniques, Vol 16, Pp 1551-1561 (2023)
Tropospheric helium variations are tightly linked to CO2 due to the co-emission of He and CO2 from natural-gas burning. Recently, Birner et al. (2022a) showed that the global consumption of natural gas has measurably increased the He content of the a
Externí odkaz:
https://doaj.org/article/2c07bf9708004647aa21aa57fd2338d0
Autor:
Logan E. Mitchell, John C. Lin, Lucy R. Hutyra, David R. Bowling, Ronald C. Cohen, Kenneth J. Davis, Elizabeth DiGangi, Riley M. Duren, James R. Ehleringer, Clayton Fain, Matthias Falk, Abhinav Guha, Anna Karion, Ralph F. Keeling, Jooil Kim, Natasha L. Miles, Charles E. Miller, Sally Newman, Diane E. Pataki, Steve Prinzivalli, Xinrong Ren, Andrew Rice, Scott J. Richardson, Maryann Sargent, Britton B. Stephens, Jocelyn C. Turnbull, Kristal R. Verhulst, Felix Vogel, Ray F. Weiss, James Whetstone, Steven C. Wofsy
Publikováno v:
Scientific Data, Vol 9, Iss 1, Pp 1-9 (2022)
Measurement(s) carbon dioxide • methane • carbon monoxide Technology Type(s) spectroscopy Sample Characteristic - Environment city Sample Characteristic - Location North America
Externí odkaz:
https://doaj.org/article/c5ba14ef6aee4abc91258b03e3060fc4
Publikováno v:
Biogeosciences, Vol 19, Pp 2627-2652 (2022)
This study considers year-to-year and decadal variations in as well as secular trends of the sea–air CO2 flux over the 1957–2020 period, as constrained by the pCO2 measurements from the SOCATv2021 database. In a first step, we relate interannual
Externí odkaz:
https://doaj.org/article/722ffd645e844826af160099f8df2aca
Autor:
N. Aoki, S. Ishidoya, Y. Tohjima, S. Morimoto, R. F. Keeling, A. Cox, S. Takebayashi, S. Murayama
Publikováno v:
Atmospheric Measurement Techniques, Vol 14, Pp 6181-6193 (2021)
A study was conducted to compare the δ(O2/N2) scales used by four laboratories engaged in atmospheric δ(O2/N2) measurements. These laboratories are the Research Institute for Environmental Management Technology, Advanced Industrial Science and Tech
Externí odkaz:
https://doaj.org/article/d389e40d71204b2a9796a889126a7606
Autor:
B. B. Stephens, E. J. Morgan, J. D. Bent, R. F. Keeling, A. S. Watt, S. R. Shertz, B. C. Daube
Publikováno v:
Atmospheric Measurement Techniques, Vol 14, Pp 2543-2574 (2021)
We have developed in situ and flask sampling systems for airborne measurements of variations in the O2/N2 ratio at the part per million level. We have deployed these instruments on a series of aircraft campaigns to measure the distribution of atmosph
Externí odkaz:
https://doaj.org/article/3b8f61937f5a4453a4d523af5d2d2dfd
Publikováno v:
Atmospheric Measurement Techniques, Vol 14, Pp 2515-2527 (2021)
The atmospheric He/N2 ratio is expected to increase due to the emission of He associated with fossil fuels and is expected to also vary in both space and time due to gravitational separation in the stratosphere. These signals may be useful indicators
Externí odkaz:
https://doaj.org/article/f21e88b9132841bebbc4ce3ce2a34e8d
Publikováno v:
Atmospheric Chemistry and Physics, Vol 21, Pp 217-238 (2021)
We introduce a transformed isentropic coordinate Mθe, defined as the dry air mass under a given equivalent potential temperature surface (θe) within a hemisphere. Like θe, the coordinate Mθe follows the synoptic distortions of the atmosphere but,
Externí odkaz:
https://doaj.org/article/159e2bb2d80f489fbf0e03ee00f0d9f6