Zobrazeno 1 - 10
of 70
pro vyhledávání: '"B W LaFranchi"'
Publikováno v:
Atmospheric Chemistry and Physics, Vol 14, Iss 11, Pp 5495-5512 (2014)
Exchange of NOx (NO+NO2) between the atmosphere and biosphere is important for air quality, climate change, and ecosystem nutrient dynamics. There are few direct ecosystem-scale measurements of the direction and rate of atmosphere–biosphere exchang
Externí odkaz:
https://doaj.org/article/32ef02ab3a2845a6af7f30d6ce4c8649
Autor:
B. W. LaFranchi, G. Pétron, J. B. Miller, S. J. Lehman, A. E. Andrews, E. J. Dlugokencky, B. Hall, B. R. Miller, S. A. Montzka, W. Neff, P. C. Novelli, C. Sweeney, J. C. Turnbull, D. E. Wolfe, P. P. Tans, K. R. Gurney, T. P. Guilderson
Publikováno v:
Atmospheric Chemistry and Physics, Vol 13, Iss 21, Pp 11101-11120 (2013)
Atmospheric radiocarbon (14C) represents an important observational constraint on emissions of fossil-fuel derived carbon into the atmosphere due to the absence of 14C in fossil fuel reservoirs. The high sensitivity and precision that accelerator mas
Externí odkaz:
https://doaj.org/article/0a64f9d27c3f48e1ad0fcf7b2d7b9ed9
Autor:
K.-E. Min, S. E. Pusede, E. C. Browne, B. W. LaFranchi, P. J. Wooldridge, G. M. Wolfe, S. A. Harrold, J. A. Thornton, R. C. Cohen
Publikováno v:
Atmospheric Chemistry and Physics, Vol 12, Iss 20, Pp 9763-9773 (2012)
Peroxynitrates are responsible for global scale transport of reactive nitrogen. Recent laboratory observations suggest that they may also play an important role in delivery of nutrients to plant canopies. We measured eddy covariance fluxes of total p
Externí odkaz:
https://doaj.org/article/8eb3693d690a46b280ce394668fc717a
Autor:
M. R. Beaver, J. M. St. Clair, F. Paulot, K. M. Spencer, J. D. Crounse, B. W. LaFranchi, K. E. Min, S. E. Pusede, P. J. Wooldridge, G. W. Schade, C. Park, R. C. Cohen, P. O. Wennberg
Publikováno v:
Atmospheric Chemistry and Physics, Vol 12, Iss 13, Pp 5773-5785 (2012)
Alkyl and multifunctional organic nitrates, molecules of the chemical form RONO2, are products of chain terminating reactions in the tropospheric HOx and NOx catalytic cycles and thereby impact ozone formation locally. Many of the molecules in the cl
Externí odkaz:
https://doaj.org/article/6206d9ee2a4245239e75009998e233bb
Autor:
A. J. Huisman, J. R. Hottle, M. M. Galloway, J. P. DiGangi, K. L. Coens, W. Choi, I. C. Faloona, J. B. Gilman, W. C. Kuster, J. de Gouw, N. C. Bouvier-Brown, A. H. Goldstein, B. W. LaFranchi, R. C. Cohen, G. M. Wolfe, J. A. Thornton, K. S. Docherty, D. K. Farmer, M. J. Cubison, J. L. Jimenez, J. Mao, W. H. Brune, F. N. Keutsch
Publikováno v:
Atmospheric Chemistry and Physics, Vol 11, Iss 17, Pp 8883-8897 (2011)
We present roughly one month of high time-resolution, direct, in situ measurements of gas-phase glyoxal acquired during the BEARPEX 2007 field campaign. The research site, located on a ponderosa pine plantation in the Sierra Nevada mountains, is stro
Externí odkaz:
https://doaj.org/article/2de22cc7e8654b7aba906fbf8af9d908
Publikováno v:
Atmospheric Chemistry and Physics, Vol 11, Iss 14, Pp 6945-6960 (2011)
Observations of NOx in the Sacramento, CA region show that mixing ratios decreased by 30 % between 2001 and 2008. Here we use an observation-based method to quantify net ozone (O3) production rates in the outflow from the Sacramento metropolitan regi
Externí odkaz:
https://doaj.org/article/df1273aedb4647ab914a416980c9f82a
Autor:
G. M. Wolfe, J. A. Thornton, N. C. Bouvier-Brown, A. H. Goldstein, J.-H. Park, M. McKay, D. M. Matross, J. Mao, W. H. Brune, B. W. LaFranchi, E. C. Browne, K.-E. Min, P. J. Wooldridge, R. C. Cohen, J. D. Crounse, I. C. Faloona, J. B. Gilman, W. C. Kuster, J. A. de Gouw, A. Huisman, F. N. Keutsch
Publikováno v:
Atmospheric Chemistry and Physics, Vol 11, Iss 3, Pp 1269-1294 (2011)
In a companion paper, we introduced the Chemistry of Atmosphere-Forest Exchange (CAFE) model, a vertically-resolved 1-D chemical transport model designed to probe the details of near-surface reactive gas exchange. Here, we apply CAFE to noontime obse
Externí odkaz:
https://doaj.org/article/ddcf9d32d8bc4941bd6479d61a17bc07
Autor:
W. Choi, I. C. Faloona, N. C. Bouvier-Brown, M. McKay, A. H. Goldstein, J. Mao, W. H. Brune, B. W. LaFranchi, R. C. Cohen, G. M. Wolfe, J. A. Thornton, D. M. Sonnenfroh, D. B. Millet
Publikováno v:
Atmospheric Chemistry and Physics, Vol 10, Iss 18, Pp 8761-8781 (2010)
To better understand the processing of biogenic VOCs (BVOCs) in the pine forests of the US Sierra Nevada, we measured HCHO at Blodgett Research Station using Quantum Cascade Laser Spectroscopy (QCLS) during the Biosphere Effects on Aerosols and Photo
Externí odkaz:
https://doaj.org/article/dfe58340add04787b789775077c117ef
Autor:
X. Ren, H. Gao, X. Zhou, J. D. Crounse, P. O. Wennberg, E. C. Browne, B. W. LaFranchi, R. C. Cohen, M. McKay, A. H. Goldstein, J. Mao
Publikováno v:
Atmospheric Chemistry and Physics, Vol 10, Iss 13, Pp 6283-6294 (2010)
Nitrous acid (HONO) is an important precursor of the hydroxyl radical (OH) in the lower troposphere. Understanding HONO chemistry, particularly its sources and contribution to HOx (=OH+HO2) production, is very important for understanding atmospheric
Externí odkaz:
https://doaj.org/article/26623adb328c46c384923d180a78cf54
Autor:
B. W. LaFranchi, A. W. Rollins, J. L. Fry, J. G. Murphy, G. M. Wolfe, J. A. Thornton, L. G. Huey, H. B. Singh, J. M. Roberts, F. M. Flocke, T. H. Bertram, P. J. Wooldridge, A. E. Perring, R. C. Cohen
Publikováno v:
Atmospheric Measurement Techniques, Vol 3, Iss 3, Pp 593-607 (2010)
Peroxyacetyl nitrate (PAN) and its chemical analogues are increasingly being quantified in the ambient atmosphere by thermal dissociation (TD) followed by detection of either the peroxyacyl radical or the NO2 product. Here we present details of the t
Externí odkaz:
https://doaj.org/article/f6cec1625da7417187439f67f3544893