A two‐layer canopy compensation point model for describing bi‐directional biosphere‐atmosphere exchange of ammonia

Quarterly Journal of the Royal Meteorological Society - Tập 127 Số 573 - Trang 815-833 - 2001
Eiko Nemitz1, C. Milford1, Mark A. Sutton1
1Edinburgh Research Station, UK

Tóm tắt

AbstractA new resistance model is described to interpret the biosphere‐atmosphere exchange fluxes of ammonia (NH3) with vegetation, and compared with previous modelling approaches for NH3. The new model constitutes an extension of an existing one‐layer canopy compensation point model: in addition to bi‐directional foliar stomatal exchange and deposition to leaf cuticles, the model treats NH3 emission from a ground layer. This may originate from fertilizer evaporation, the soil or decomposing plant parts. The emission potentials of the foliage and ground surface are given by the NH3 gas concentrations at equilibrium with the ammonium (NH+4) concentration in the apoplastic fluid or soil solution. From these concentrations, as well as the transfer resistances of the different exchange pathways, the net compensation point of the canopy (Xc) may be derived. The net flux is determined by the relative magnitude of Xc and the NH3 air concentration above the vegetation. The two‐layer canopy compensation point is applied to: (i) an oilseed rape canopy, in which NH3 emission from decomposing leaf litter at the ground surface presents a second major source; and (ii) a wheat stubble field, in which emission from the soil contributes significantly to the net exchange. For both canopies, the model performance is contrasted with the single‐layer Xc model, which is not able to reproduce the temporal patterns of exchange. The two‐layer model is proposed as the optimum compromise between simplicity and accuracy, capable of describing bi‐directional NH3 exchange in atmospheric transport models over a very wide range of vegetation types.

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Tài liệu tham khảo

Asman W. A. H.1992Ammonia emissions in Europe: updated emission and emission variations. RIVM Report 228471008 Rijksinstituut voor Volksgezondheid en Milieu Bilthoven the Netherlands

10.1029/97GB02266

10.1002/jsfa.2740220104

10.1029/JC082i021p03125

10.1016/0038-0717(76)90083-3

Dragosits U., 1998, Nitrogen, the Confer‐N‐s, first international nitrogen conference 1998, 195

Duyzer J. H. Bouman A. M. H. Diederen H. S. M. A.andvan Aalst R. M.1987Measurement of dry deposition velocities of NH3and NH+4 over natural terrains. Report R 87/273. TNO Milieu Energie en Procesinnovatie Delft the Netherlands

EMEP/MSC‐W1997The multi‐layer Eulerian model: Model description and evaluation of transboundary fluxes of sulphur and nitrogen for one year. EMEP (the Co‐operative Programme for Monitoring and Evaluation of the Long Range Transmission of Air Pollutants in Europe) MSC‐W Report 2/97. Meteorological Synthesizing Centre‐West The Norwegian Meteorological Institute Oslo Norway

10.1016/0960-1686(93)90266-2

10.1016/1352-2310(94)90433-2

10.1104/pp.66.4.710

Flechard C. R.1998Turbulent exchange of ammonia above vegetation. PhD thesis. University of Nottingham

10.1002/qj.49712454706

10.1002/qj.49712555914

10.1016/S0269-7491(98)80053-5

10.1098/rspa.1977.0066

10.1007/BF00229675

10.1104/pp.125.1.476

10.1104/pp.109.4.1453

10.1016/S0168-1923(00)00204-5

Jarvis P. G., 1976, The interpretation of the variations in leaf water potential and stomatal conductance found in canopies in the field, Phil. Trans. R. Soc. London, 273, 593

10.1029/92GB02123

Meixner F. X., 1996, Bi‐directional exchange of ammonia over cereals, 129

Monteith J. L., 1990, Principles of environmental physics

Nemitz E. G.1988Surface‐atmosphere exchange of ammonia and chemically interacting species. PhD thesis UMIST Manchester

10.1016/S0168-1923(00)00206-9

10.1016/S0168-1923(00)00205-7

10.2134/agronj1988.00021962008000030008x

10.1111/j.1469-8137.1993.tb03882.x

Plantaz M. A. H. G. Slanina J.andWyers G. P.1996Surface/atmosphere exchange of ammonia over grazed pasture Report ECN‐C‐96‐085. Energieonderzoek Centrum Nederland Petten the Netherlands

10.1016/0168-1923(89)90089-0

Schjorring J. K.1998Plant‐atmosphere ammonia exchange: quantification physiological regulation and interaction with environmental factors. DSc thesis Royal Veterinary and Agricultural University Copenhagen

10.1007/BF00121971

Seinfeld J. H., 1986, Atmospheric chemistry and physics of air pollution

10.1002/qj.49711146910

10.1016/0269-7491(88)90110-8

10.1007/BF00748549

10.1016/1352-2310(95)00381-9

Spindler G., 1996, Poster proceedings of the international conference on atmospheric ammonia, Oxford 2–4 Oct. 1995, 86

Sutton M. A.andFowler D.1993A model for inferring bi‐directional fluxes of ammonia over plant canopies. Pp.179–179in Proceedings of the WMO conference on the measurement and modelling of atmospheric composition changes including pollution transport. Sofia Bulgaria 4–8 October1993. WMO/GAW (Global Atmosphere Watch) 91. World Meteorological Organization Geneva Switzerland

Sutton M. A., 2000, Report of the thematic working groups of the tenth nitrogen workshop 23–26 August 1999

10.1016/0269-7491(92)90051-B

10.1002/qj.49711951309

10.1002/qj.49711951310

10.1098/rsta.1995.0033

10.1016/S0166-1116(06)80274-8

Sutton M. A. Nemitz E. Fowler D. Wyers G. P. Otjes R. P. San José R. Moreno J. Schjorring J. K. Husted S. Meixner F. X. Ammann C. Neftel A.andGut A.1996Overview of the EXAMINE project. In Exchange of Atmospheric Ammonia with European Ecosystems (EXAMINE) December1996. Final report to the European Commission Vol I. Institute of Terrestrial Ecology Edinburgh UK

Sutton M. A., 1997, Gaseous nitrogen emissions from grasslands, 131

10.1016/S1352-2310(97)00164-7

10.1016/S0168-1923(00)00202-1

10.1016/S0168-1923(00)00203-3

10.1023/A:1004822100016

UNECE1999Draft protocol to the1979convection on long‐range transboundary air pollution to abate acidification eutrophication and ground‐level ozone. EB.AIR/1999/1 United Nations Economic Commission for Europe Executive body for the convention on long‐range transboundary air pollution. Available from UN/ECE Environment and Human Settlements Division Palais des Nations CH‐1211 Geneva Switzerland

10.1016/S0269-7491(96)00099-1

10.1016/1352-2310(95)00403-3

10.1016/0004-6981(89)90153-4

10.1016/S1352-2310(97)00275-6

10.1016/0960-1686(93)90280-C

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Quarterly Journal of the Royal Meteorological Society

Tập 127 Số 573

815-833

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