Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 11 2 2007 10.5194/hess-11-1013-2007 http://www.hydrol-earth-syst-sci.net/11/1013/2007/ http://www.hydrol-earth-syst-sci.net/11/1013/2007/hess-11-1013-2007.html http://www.hydrol-earth-syst-sci.net/11/1013/2007/hess-11-1013-2007.pdf 1013 1033 2007-03-27 Biotic pump of atmospheric moisture as driver of the hydrological cycle on land A. M. Makarieva elba@infopro.spb.su V. G. Gorshkov Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg, Russia In this paper the basic geophysical and ecological principles are jointly analyzed that allow the landmasses of Earth to remain moistened sufficiently for terrestrial life to be possible. 1. Under gravity, land inevitably loses water to the ocean. To keep land moistened, the gravitational water runoff must be continuously compensated by the atmospheric ocean-to-land moisture transport. Using data for five terrestrial transects of the International Geosphere Biosphere Program we show that the mean distance to which air fluxes can transport moisture over non-forested areas, does not exceed several hundred kilometers; precipitation decreases exponentially with distance from the ocean. 2. In contrast, precipitation over extensive natural forests does not depend on the distance from the ocean along several thousand kilometers, as illustrated for the Amazon and Yenisey river basins and Equatorial Africa. This points to the existence of an active biotic pump transporting atmospheric moisture inland from the ocean. 3. Physical principles of the biotic moisture pump are investigated based on the previously unstudied properties of atmospheric water vapor, which can be either in or out of aerostatic equilibrium depending on the lapse rate of air temperature. A novel physical principle is formulated according to which the low-level air moves from areas with weak evaporation to areas with more intensive evaporation. Due to the high leaf area index, natural forests maintain high evaporation fluxes, which support the ascending air motion over the forest and "suck in" moist air from the ocean, which is the essence of the biotic pump of atmospheric moisture. In the result, the gravitational runoff water losses from the optimally moistened forest soil can be fully compensated by the biotically enhanced precipitation at any distance from the ocean. 4. It is discussed how a continent-scale biotic water pump mechanism could be produced by natural selection acting on individual trees. 5. Replacement of the natural forest cover by a low leaf index vegetation leads to an up to tenfold reduction in the mean continental precipitation and runoff, in contrast to the previously available estimates made without accounting for the biotic moisture pump. The analyzed body of evidence testifies that the long-term stability of an intense terrestrial water cycle is unachievable without the recovery of natural, self-sustaining forests on continent-wide areas. Acevedo, O. C., Moraes, O. L. L., da Silva, R., Fitzjarrald, D. R., Sakai, R. K., Staebler, R. M., and Czikowsky, M. J.: Inferring nocturnal surface fluxes from vertical profiles of scalars in an Amazon pasture, Global Change Biology, 10, 886–894, 2004. Adler, R. F., Huffman, G. J., Bolvin, D. T., Curtis, S., and Nelkin, E. J.: Tropical rainfall distributions determined using TRMM combined with other satellite and rain gauge, J. Appl. Meteorol., 39, 2007–2023, 2001. Arora, V.: Comment on "Optimized stomatal conductance of vegetated land surfaces and its effects on simulated productivity and climate" edited by: Kleidon, A., Geophys. Res. Lett., 32, L08708, doi:10.1029/2004GL022110, 2005. Austin, A. T. and Sala, O. E.: Carbon and nitrogen dynamics across a natural precipitation gradient in Patagonia, Argentina, J. Vegetation Sci., 13, 351–360, 2002. Austin, A. T. and Vitousek, P. M.: Precipitation, decomposition and litter decomposability of Metrosideros polymorpha in native forests on Hawaii, J. Ecology, 88, 129–138, 2000. Baerlocher, F.: The Gaia hypothesis: A fruitful fallacy?, Experientia, 46, 232–238, 1990. Barrett, J. E., McCulley, R. L., Lane, D. R., Burke, I. C., and Lauenroth, W. K.: Influence of climate variability on plant production and N-mineralization in Central US grasslands, J. Vegetation Sci., 13, 383–394, 2002. Bond, B. J. and Kavanagh, K. L.: Stomatal behavior of four woody species in relation to leaf-specific hydraulic conductance and threshold water potential, Tree Physiology, 19, 503–510, 1999. Bowman, D. M. J. S.: The Australian summer monsoon: a biogeographic perspective, Australian Geographic Studies, 40, 261–277, 2002. Breshears, D. D., Nyhan, J. W., Heil, C. E., and Wilcox, B. P.: Effects of woody plants on microclimate in a semiarid woodland: soil temperature and evaporation in canopy and intercanopy patches, Int. J. Plant Sci., 159, 1010–1017, 1998. Bryant, D., Nielsen, D., and Tangley, L.: The last frontier forests: ecosystems and economies on the edge, World Resources Institute, Washington, 1997. Cabido, M., Gonzalez, C., Acosta, A., and Diaz, S.: Vegetation changes along a precipitation gradient in central Argentina, Vegetatio, 109, 5–14, 1993. Canadell, J G., Steffen, W L., and White, P S.: IGBP/GCTE terrestrial transects: Dynamics of terrestrial ecosystems under environmental change – Introduction, J. Vegetation Sci., 13, 297–300, 2002. Cochrane, M. A., Alencar, A., Schulze, M. D., Souza, C. M., Nepstad, D. C., Lefebvre, P., and Davidson, E. A.: Positive feedbacks in the fire dynamic of closed canopy tropical forests, Science, 284, 1832–1835, 1999. Coley, P. D. and Barone, J. A.: Herbivory and plant defenses in tropical forests, Annual Review of Ecology and Systematics, 27, 305–335, 1996. Cook, G. D. and Heerdegen, R. G.: Spatial variation in the duration of the rainy season in monsoonal Australia, Int. J. Climatology, 21, 1723–1732, 2001. da Rocha, H. R., Goulden, M. L., Miller, S. D., Menton, M. C., Pinto, L. D. V. O., de Freitas, H. C., and Silva Figueira, A. M. E.: Seasonality of water and heat fluxes over a tropical forest in eastern Amazonia, Ecological Appl., 14(Suppl), S22–S32, 2004. Dai, A. and Trenberth, K E.: Estimates of freshwater discharge from continents: latitudinal and seasonal variations, J. Hydrometeorol., 3, 660–687, 2002. Doolittle, W. F.: Is nature really Motherly?, CoEvolution Quaterly, 29, 58–63, 1981. Fang, M. and Tung, K. K.: Time-dependent nonlinear Hadley circulation, J. Atmos. Sci., 56, 1797–1807, 1999. Folkins, I.: Convective damping of buoyancy anomalies and its effect on lapse rates in the tropical lower troposphere, Atmos. Chem. Phys., 6, 1–12, 2006. Goody, R. M. and Yung, Y. L.: Atmospheric radiation, theoretical basis, 2nd edn, Oxford Univ. Press, New York, 1989. Gorshkov, V. G.: Ecology of man, Leningrad Polytechnical Institute, Leningrad, 1984. Gorshkov, V. G.: Physical and biological bases of life stability, Springer, Berlin, 1995. Gorshkov, V. G. and Makarieva, A. M.: On the possibility of physical self-organization of biological and ecological systems, Doklady Biological Sci., 378, 258–261, 2001. Gorshkov, V. G., Gorshkov, V. V., and Makarieva, A. M.: Biotic regulation of the environment: Key issue of global change, Springer, London, 2000. Gorshkov, V. G., Makarieva, A. M., and Gorshkov, V. V.: Revising the fundamentals of ecological knowledge: The biota-environment interaction, Ecol. Complexity, 1, 17–36, 2004. Goulden, M. L., Daube, B. C., Fan, S.-M., Sutton, D. J., Bazzaz, A., Munger, J. W., and Wofsy, S. C.: Physiological response of a black spruce forest to weather, J. Geophys. Res., 102D, 28 987–28 996, 1997. Goulden, M. L., Miller, S. D., da Rocha, H. R., Menton, M. C., de Freitas, H. C., Silva Figueira, A. M. E., and de Sousa, C. A. D.: Diel and seasonal patterns of tropical forest \chemCO_2 exchange, Ecol. Appl., 14(Suppl), S42–S54, 2004. Gustavson, M. R.: Limits to the wind power utilization, Sci., 204, 13–17, 1979. Hodnett, M. G., Oyama, M. D., Tomasella, J., and Marques Filho, A. de O.: Comparisons of long-term soil water storage behaviour under pasture and forest in three areas of Amazonia, in: Amazonian deforestation and climate, edited by: Gash, J. H. C., Nobre, C. A., Roberts, J. M., and Victoria, R. L., 57–77, John Wiley & Sons, Chichester, 1996. Hutley, L. B., O'Grady, A. P., and Eamus, D.: Monsoonal influences on evapotranspiration of savanna vegetation of northern Australia, Oecologia, 126, 434–443, 2001. Karlsson, I. M.: Nocturnal air temperature variations between forest and open areas, J. Appl. Meteorol., 39, 851–862, 2000. Kleidon, A.: Optimized stomatal conductance of vegetated land surfaces and its effects on simulated productivity and climate, Geophys. Res. Lett., 31, L21203, doi:10.1029/2004GL020769, 2004. Kleidon, A.: Reply to comment by V. Arora on "Optimized stomatal conductance of vegetated land surfaces and its effects on simulated productivity and climate", Geophys. Res. Lett., 32, L08709, doi:10.1029/2005GL022355, 2005. Kruijt, B., Malhi, Y., Lloyd, J., Nobre, A. D., Miranda, A. C., Pereira, M. G. P., Culf, A., and Grace, J.: Turbulence statistics above and within two Amazon rain forest canopies, Boundary-Layer Meteorol., 94, 297–331, 2000. Kurc, S. A. and Small, E.E.: Dynamics of evapotranspiration in semiarid grassland and shrubland ecosystems during the summer monsoon season, central New Mexico, Water Resour. Res., 40, W09305, doi:10.1029/2004WR003068, 2004. Lal, R.: Soil erosion and land degradation: the global risks, in: Advances in soil science, 11, Soil degradation, edited by: Lal, R. and Stewart, B. A., 129–172, Springer, New York, 1990. Landau, L. D., Akhiezer, A. I., and Lifshitz, E. M.: General Physics., Mechanics and Molecular Physics, Nauka, Moscow, 1965. Landau, L. D. and Lifshitz, E. M.: Course of Theoretical Physics, 6, Fluid Mechanics, 2nd ed., Butterworth-Heinemann, Oxford, 1987. Lorenz, E. N.: The nature and theory of the general circulation of the atmosphere, World Meteorological Organization, Geneva, 1967. L'vovitch, M. I.: World water resources and their future, American Geological Union, Washington, 1979. Mahrt, L., Lee, X., Black, A., Neumann, H., and Staebler, R. M.: Nocturnal mixing in a forest subcanopy, Agric. Forest Meteorol., 101, 67–78, 2000. Makarieva, A. M., Gorshkov, V. G., and Li, B.-L.: Biochemical universality of living matter and its metabolic implications, Functional Ecol., 19, 547–557, 2005a. Makarieva, A. M., Gorshkov, V. G., and Li, B.-L.: Revising the distributive networks models of West, Brown and Enquist (1997) and Banavar, Maritan and Rinaldo (1999): Metabolic inequity of living tissues provides clues for the observed allometric scaling rules, J. Theor. Biol., 237, 291–301, 2005b. Makarieva, A. M., Gorshkov, V. G., and Li, B.-L.: Energetics of the smallest: Do bacteria breathe at the same rate as whales?, Proceedings of the Royal Society of London B, 272, 2219–2224, 2005c. Marengo, J. A.: Interdecadal variability and trends of rainfall across the Amazon basin, Theor. Appl. Climatology, 78, 79–96, 2004. McEwan, M. J. and Phillips L. F.: Chemistry of the atmosphere, Edward Arnold, London, 1975. McGuffie, K. and Henderson-Sellers, A.: Forty years of numerical climate modelling, Int. J. Climatology, 21, 1067–1109, 2001. McGuire, A. D., Prentice, I. C., Ramankutty, N., Reichenau, T., Schloss, A., Tian, H., Williams, L. J., and Wittenberg, U.: Carbon balance of the terrestrial biosphere in the twentieth century: Analyses of \chemCO_2, climate and land-use effects with four process-based ecosystem models, Global Biogeochem. Cycles, 15, 183–206, 2001. Miller, J. M., Williams, R. J., and Farquhar, G. D.: Carbon isotope discrimination by a sequence of Eucalyptus species along a subcontinental rainfall gradient in Australia, Funct. Ecol., 15, 222–232, 2001. Nepstad, D., Lefebvre, P., da Silva, U. L., Tomasella, J., Schlesinger, P., Solorzano, L., Ray, P. M. D., and Benito, J. G.: Amazon drought and its implications for forest flammability and tree growth: a basin-wide analysis, Global Change Biol., 10, 704–717, 2004. Nesbitt, S. W. and Zipser, E. J.: The diurnal cycle of rainfall and convective intensity according to three years of TRMM measurements, J. Climate, 16, 1456–1475, 2003. Ni, J. and Zhang, X. S.: Climate variability, ecological gradient and the Northeast China Transect (NECT), J. Arid Environments, 46, 313–325, 2000. Nicholson, S. E.: The nature of rainfall variability over Africa on time scales of decades to millenia, Global Planet. Change, 26, 137–158, 2000. Oyama, M. D. and Nobre, C. A.: Climatic consequences of a large-scale desertification in Northeast Brazil: A GCM simulation study, J. Climate, 17, 3203–3213, 2004. Randel, D. L., Haar, T. H. V., Ringerud, M. A., Stephens, G. L., Greenwald, T. J., and Comb, C. L.: New global water vapor dataset, Bulletin of the American Meteorol. Society, 77, 1233–1254, 1996. Savenije, H H G.: New definitions for moisture recycling and the relationship with land-use change in the Sahel, J. Hydrology, 167, 57–78, 1995. Savenije, H H G.: Does moisture feedback affect rainfall significantly?, Physics Chem. Earth, 20, 507–513, 1996a. Savenije, H H G.: The runoff coefficient as the key to moisture recycling, Journal of Hydrology, 176, 219–225, 1996b. Savenije, H. H. G.: The importance of interception and why we should delete the term evapotranspiration from our vocabulary, Hydrol. Processes, 18, 1507–1511, 2004. Shver, C. A.: Atmospheric precipitation on the territory of the USSR, Meteoizdat, Leningrad, 1976. Shuttleworth, W. J.: Micrometeorology of temperate and tropical forest, Philosophical Transactions of the Royal Society of London B, 324, 207–228, 1989. Shuttleworth, W. J., Gash, J. H. C., Lloyd, C. R., Moore, C. J., Roberts, J., Marques-Filho, A. O., Fisch, G., Filho, V. P. S., Ribeiro, M. N. G., Molion, L. C. B., Sa, L. D. A., Nobre, J. C. A., Cabral, O. M. R., Patel, S. R., and Carvalho, J. M.: Daily variations of temperature and humidity within and above Amazonian forest, Weather, 40, 102–108, 1985. Smith, S. B.: Comments on "An interesting mesoscale storm-environment interaction observed just prior to changes in severe storm behavior", Weather and Forecasting, 12, 368–372, 1997. Szarzynski, J. and Anhuf, D.: Micrometeorological conditions and canopy energy exchanges of a neotropical rain forest (Surumoni-Crane Project, Venezuela), Plant Ecol., 153, 231–239, 2001. Tchebakova, N. M., Kolle ,O., Zolotoukhine, D., Arneth, A., Styles, J. M., Vygodskaya, N. N., Schulze, E.-D., Shibistova, O., and Lloyd, J.: Inter-annual and seasonal variations of energy and water vapor fluxes above a Pinus sylvestris forest in the Siberian middle taiga, Tellus B, 54, 537–551, 2002. Tutin, C. E. G., White, L. J. T., and Mackanga-Missandzou, A.: The use by rain forest mammals of natural forest fragments in an equatorial African Savanna, Conservation Biol., 11, 1190–1203, 1997. Van de Koppel, J. and Prins, H. H. T.: The importance of herbivore interactions for the dynamics of African savanna woodlands: an hypothesis, J. Tropical Ecol., 14, 565–576, 1998. Weaver, C. P. and Ramanathan, V.: Deductions from a simple climate model: Factors governing surface temperature and atmospheric thermal structure, J. Geophys. Res., 100D, 11 585–11 591, 1995. Webber, S. R. and Wilmott, C. J.: South American Precipitation: 1960–1990 gridded monthly time series (version 1.02), Center for Climatic Research, Department of Geography, University of Delaware, Newark, Delaware, 1998. Werth, D. and Avissar, R.: The regional evapotranspiration of the Amazon, J. Hydrometeorol., 5, 100–109, 2004. Zhou, J. and Lau, K.-M.: Does a monsoon climate exist over South America?, J. Climate, 11, 1020–1040, 1998.