Zobrazeno 1 - 10
of 101
pro vyhledávání: '"C. Helfter"'
Publikováno v:
Atmospheric Chemistry and Physics, Vol 23, Pp 2315-2330 (2023)
Fluxes of nitrogen oxides (NOx=NO+NO2) and carbon dioxide (CO2) were measured using eddy covariance at the British Telecommunications (BT) Tower in central London during the coronavirus pandemic. Comparing fluxes to those measured in 2017 prior to th
Externí odkaz:
https://doaj.org/article/0e11a47c64c245218644c85b490d9189
Autor:
W. S. Drysdale, A. R. Vaughan, F. A. Squires, S. J. Cliff, S. Metzger, D. Durden, N. Pingintha-Durden, C. Helfter, E. Nemitz, C. S. B. Grimmond, J. Barlow, S. Beevers, G. Stewart, D. Dajnak, R. M. Purvis, J. D. Lee
Publikováno v:
Atmospheric Chemistry and Physics, Vol 22, Pp 9413-9433 (2022)
During March–June 2017 emissions of nitrogen oxides were measured via eddy covariance at the British Telecom Tower in central London, UK. Through the use of a footprint model the expected emissions were simulated from the spatially resolved Nationa
Externí odkaz:
https://doaj.org/article/9f41cfd020174c8c818f43067a12e8d8
Autor:
M. F. Lunt, A. J. Manning, G. Allen, T. Arnold, S. J.-B. Bauguitte, H. Boesch, A. L. Ganesan, A. Grant, C. Helfter, E. Nemitz, S. J. O'Doherty, P. I. Palmer, J. R. Pitt, C. Rennick, D. Say, K. M. Stanley, A. R. Stavert, D. Young, M. Rigby
Publikováno v:
Atmospheric Chemistry and Physics, Vol 21, Pp 16257-16276 (2021)
Atmospheric measurements can be used as a tool to evaluate national greenhouse gas inventories through inverse modelling. Using 8 years of continuous methane (CH4) concentration data, this work assesses the United Kingdom's (UK) CH4 emissions over th
Externí odkaz:
https://doaj.org/article/9c5b7366dc9847928a0a230cf1d33b6b
Autor:
K. B. Delwiche, S. H. Knox, A. Malhotra, E. Fluet-Chouinard, G. McNicol, S. Feron, Z. Ouyang, D. Papale, C. Trotta, E. Canfora, Y.-W. Cheah, D. Christianson, Ma. C. R. Alberto, P. Alekseychik, M. Aurela, D. Baldocchi, S. Bansal, D. P. Billesbach, G. Bohrer, R. Bracho, N. Buchmann, D. I. Campbell, G. Celis, J. Chen, W. Chen, H. Chu, H. J. Dalmagro, S. Dengel, A. R. Desai, M. Detto, H. Dolman, E. Eichelmann, E. Euskirchen, D. Famulari, K. Fuchs, M. Goeckede, S. Gogo, M. J. Gondwe, J. P. Goodrich, P. Gottschalk, S. L. Graham, M. Heimann, M. Helbig, C. Helfter, K. S. Hemes, T. Hirano, D. Hollinger, L. Hörtnagl, H. Iwata, A. Jacotot, G. Jurasinski, M. Kang, K. Kasak, J. King, J. Klatt, F. Koebsch, K. W. Krauss, D. Y. F. Lai, A. Lohila, I. Mammarella, L. Belelli Marchesini, G. Manca, J. H. Matthes, T. Maximov, L. Merbold, B. Mitra, T. H. Morin, E. Nemitz, M. B. Nilsson, S. Niu, W. C. Oechel, P. Y. Oikawa, K. Ono, M. Peichl, O. Peltola, M. L. Reba, A. D. Richardson, W. Riley, B. R. K. Runkle, Y. Ryu, T. Sachs, A. Sakabe, C. R. Sanchez, E. A. Schuur, K. V. R. Schäfer, O. Sonnentag, J. P. Sparks, E. Stuart-Haëntjens, C. Sturtevant, R. C. Sullivan, D. J. Szutu, J. E. Thom, M. S. Torn, E.-S. Tuittila, J. Turner, M. Ueyama, A. C. Valach, R. Vargas, A. Varlagin, A. Vazquez-Lule, J. G. Verfaillie, T. Vesala, G. L. Vourlitis, E. J. Ward, C. Wille, G. Wohlfahrt, G. X. Wong, Z. Zhang, D. Zona, L. Windham-Myers, B. Poulter, R. B. Jackson
Publikováno v:
Earth System Science Data, Vol 13, Pp 3607-3689 (2021)
Methane (CH4) emissions from natural landscapes constitute roughly half of global CH4 contributions to the atmosphere, yet large uncertainties remain in the absolute magnitude and the seasonality of emission quantities and drivers. Eddy covariance (E
Externí odkaz:
https://doaj.org/article/1a0b0d8493814f1ab3b2b9bac057e320
Autor:
C. R. Flechard, A. Ibrom, U. M. Skiba, W. de Vries, M. van Oijen, D. R. Cameron, N. B. Dise, J. F. J. Korhonen, N. Buchmann, A. Legout, D. Simpson, M. J. Sanz, M. Aubinet, D. Loustau, L. Montagnani, J. Neirynck, I. A. Janssens, M. Pihlatie, R. Kiese, J. Siemens, A.-J. Francez, J. Augustin, A. Varlagin, J. Olejnik, R. Juszczak, M. Aurela, D. Berveiller, B. H. Chojnicki, U. Dämmgen, N. Delpierre, V. Djuricic, J. Drewer, E. Dufrêne, W. Eugster, Y. Fauvel, D. Fowler, A. Frumau, A. Granier, P. Gross, Y. Hamon, C. Helfter, A. Hensen, L. Horváth, B. Kitzler, B. Kruijt, W. L. Kutsch, R. Lobo-do-Vale, A. Lohila, B. Longdoz, M. V. Marek, G. Matteucci, M. Mitosinkova, V. Moreaux, A. Neftel, J.-M. Ourcival, K. Pilegaard, G. Pita, F. Sanz, J. K. Schjoerring, M.-T. Sebastià, Y. S. Tang, H. Uggerud, M. Urbaniak, N. van Dijk, T. Vesala, S. Vidic, C. Vincke, T. Weidinger, S. Zechmeister-Boltenstern, K. Butterbach-Bahl, E. Nemitz, M. A. Sutton
Publikováno v:
Biogeosciences, Vol 17, Pp 1583-1620 (2020)
The impact of atmospheric reactive nitrogen (Nr) deposition on carbon (C) sequestration in soils and biomass of unfertilized, natural, semi-natural and forest ecosystems has been much debated. Many previous results of this dC∕dN response were based
Externí odkaz:
https://doaj.org/article/22db95525cf24bd990089ab50a71d64e
Publikováno v:
Atmospheric Chemistry and Physics, Vol 19, Pp 3043-3063 (2019)
We present a mass balance approach to estimate the seasonal and annual budgets of carbon dioxide (CO2) and methane (CH4) of the United Kingdom (excluding Scotland) and the Republic of Ireland from concentration measurements taken on a ferry along the
Externí odkaz:
https://doaj.org/article/10e659f85ac44f599d4e261d9be56c57
Autor:
P. I. Palmer, S. O'Doherty, G. Allen, K. Bower, H. Bösch, M. P. Chipperfield, S. Connors, S. Dhomse, L. Feng, D. P. Finch, M. W. Gallagher, E. Gloor, S. Gonzi, N. R. P. Harris, C. Helfter, N. Humpage, B. Kerridge, D. Knappett, R. L. Jones, M. Le Breton, M. F. Lunt, A. J. Manning, S. Matthiesen, J. B. A. Muller, N. Mullinger, E. Nemitz, S. O'Shea, R. J. Parker, C. J. Percival, J. Pitt, S. N. Riddick, M. Rigby, H. Sembhi, R. Siddans, R. L. Skelton, P. Smith, H. Sonderfeld, K. Stanley, A. R. Stavert, A. Wenger, E. White, C. Wilson, D. Young
Publikováno v:
Atmospheric Chemistry and Physics, Vol 18, Pp 11753-11777 (2018)
We describe the motivation, design, and execution of the Greenhouse gAs Uk and Global Emissions (GAUGE) project. The overarching scientific objective of GAUGE was to use atmospheric data to estimate the magnitude, distribution, and uncertainty of
Externí odkaz:
https://doaj.org/article/f1805441b4004b3880f9272339a445a6
Autor:
S. K. Jones, C. Helfter, M. Anderson, M. Coyle, C. Campbell, D. Famulari, C. Di Marco, N. van Dijk, Y. S. Tang, C. F. E. Topp, R. Kiese, R. Kindler, J. Siemens, M. Schrumpf, K. Kaiser, E. Nemitz, P. E. Levy, R. M. Rees, M. A. Sutton, U. M. Skiba
Publikováno v:
Biogeosciences, Vol 14, Iss 8, Pp 2069-2088 (2017)
Intensively managed grazed grasslands in temperate climates are globally important environments for the exchange of the greenhouse gases (GHGs) carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4). We assessed the N and C budget of a mostly gr
Externí odkaz:
https://doaj.org/article/0ae63168e7ab4484b9cab7ce888c7829
Autor:
C. Helfter, A. H. Tremper, C. H. Halios, S. Kotthaus, A. Bjorkegren, C. S. B. Grimmond, J. F. Barlow, E. Nemitz
Publikováno v:
Atmospheric Chemistry and Physics, Vol 16, Pp 10543-10557 (2016)
We report on more than 3 years of measurements of fluxes of methane (CH4), carbon monoxide (CO) and carbon dioxide (CO2) taken by eddy-covariance in central London, UK. Mean annual emissions of CO2 in the period 2012–2014 (39.1 ± 2.4 ktons km
Externí odkaz:
https://doaj.org/article/3bc676e2b85f429a8114d5462a633560
Autor:
P. Kountouris, C. Gerbig, K.-U. Totsche, A. J. Dolman, A. G. C. A. Meesters, G. Broquet, F. Maignan, B. Gioli, L. Montagnani, C. Helfter
Publikováno v:
Biogeosciences, Vol 12, Iss 24, Pp 7403-7421 (2015)
Assigning proper prior uncertainties for inverse modelling of CO2 is of high importance, both to regularise the otherwise ill-constrained inverse problem and to quantitatively characterise the magnitude and structure of the error between prior and "t
Externí odkaz:
https://doaj.org/article/74b0a5a5bf6f488882a3d3b2f9763e7e