Simulated and observed 37 GHz emission over Africa

References

• AIDA , M. , 1980 , Scattering of solar radiation as a function of cloud dimensions and orientation. Journal of Quantitative Spectroscopy and Radiative Transfer , 17 , 303 – 310 .
   Web of Science ®Google Scholar
• BALDOCCHI , D. D. , HUTCHISON , B. A. , MATT , D. R. , and MCMILLAN , R. T. , 1985 , Canopy radiative transfer models for spherical and known leaf inclination angle distributions: A test in an Oak-Hickory forest. Journal of Applied Ecology , 22 , 539 – 555 .
   Web of Science ®Google Scholar
• BECKER , F. , BOLLE , H. -J., and ROWNTREE , P. R. , 1988 , The International Satellite Land-Surface Climatology Project. , ISLSCP-Report No. 10, ISLSCP-Secretariet, Free University of Berlin, Berlin , FR Germany .
   Google Scholar
• BECKER , F. , and CHOUDHURY , B. J. , 1988 , Relative sensitivity of normalized difference vegetation index (NDVI) and microwave polarization difference index (MPDI) for vegetation and desertification monitoring. Remote Sensing of Environment , 24 , 297 – 311 .
   Web of Science ®Google Scholar
• BECKMAN , P. , 1968 , The Depolarization of Electromagnetic Waves , ( Boulder : Golem ).
   Google Scholar
• BRUNKELDT , D. R. , and ULABY , F. T. , 1986 , Microwave emission from row crops. I.E.E.E. Transactions on Geoscience and Remote Sensing , 24 , 353 – 359 .
   Web of Science ®Google Scholar
• CANNELL , M. G. R. , 1982 , World Forest Biomass and Primary Production Data , ( New York : Academic Press ).
   Google Scholar
• CHANDRASEKHAR , S. , 1960 , Radiative Transfer , ( London : Dover ).
   Google Scholar
• CHOUDHURY , B. J. , 1987 , Relationships between vegetation indices, radiation absorption, and net photosynthesis evaluated by a sensitivity analysis. Remote Sensing of Environment , 22 , 209 – 233 .
   Web of Science ®Google Scholar
• CHOUDHURY , B. J. , 1988 , Relating Nimbus-7 37 GHz data to global land-surface evaporation, primary productivity and the atmospheric CO2 concentration. International Journal of Remote Sensing , 9 , 169 – 176 .
   Web of Science ®Google Scholar
• CHOUDHURY , B. J. , 1989 , Monitoring global land surface using Nimbus-7 37 GHz data: Theory and observations. International Journal of Remote Sensing , 10 , 1579 – 1605 .
   Web of Science ®Google Scholar
• CHOUDHURY , B. J. , and GOLUS , R. E. , 1988 , Estimating soil wetness using satellite data. International Journal of Remote Sensing , 9 , 1251 – 1257 .
   Web of Science ®Google Scholar
• CHOUDHURY , B. J. , TUCKER , C. J. , GOLUS , R. E. , and NEWCOMB , W. W. , 1987 , Monitoring vegetation using Nimbus-7 scanning multichannel microwave radiometer's data. International Journal of Remote Sensing , 8 , 533 – 538 .
   Web of Science ®Google Scholar
• GOWARD , S. N. , DYE , D. , KERBER , A. , and KALB , V. , 1987 , Comparison of North and South American biomes from AVHRR observations. Geocarto International , 1 , 27 – 39 .
   Google Scholar
• HAPKE , B. , 1981 , Bidirectional reflectance spectroscopy. I. Theory. Journal of Geophysical Research , 86 , 3039 – 3054 .
   Web of Science ®Google Scholar
• HALLIKAINEN , M. , and JOLMA , P. , 1986 , Classification of forest and surface types by satellite microwave radiometry. Proceedings of IGARSS '86 held in Zurich, Switzerland, on 8–11 September 1986. , ESA SP-254 ( Paris : European Space Agency ), pp. 853 – 858 .
   Google Scholar
• HALLIKAINEN , M. , JOLMA , P. A. , and HYYPA , J. M. , 1988 , Satellite microwave radiometry of forest and surface type in Finland. I.E.E.E. Transactions on Geoscience and Remote Sensing , 26 , 622 – 628 .
   Web of Science ®Google Scholar
• HOLBEN , B. N. , 1986 , Characteristics of maximum-value composite images from temporal AVHRR data. International Journal of Remote Sensing , 7 , 1417 – 1434 .
   Web of Science ®Google Scholar
• JACKSON , T. J. , SCHMUGGE , T. J. , and WANG , J. R. , 1982 , Passive microwave sensing of soil moisture under vegetation canopies. Water Resources Research , 18 , 1137 – 1142 .
   Web of Science ®Google Scholar
• JUSTICE , C. O. , TOWNSHEND , and CHOUDHURY , B. J. , 1989 , Comparison of AVHRR and SMMR data for monitoring vegetation phenology at a continental scale. International Journal of Remote Sensing , 10 , 1607 – 1632 .
   Web of Science ®Google Scholar
• JUSTICE , C. O. , TOWNSHEND , J. R. G. , HOLBEN , B. N. , and TUCKER , C. J. , 1985 , Analysis of the phenology of global vegetation using meteorologic satellite data. International Journal of Remote Sensing , 6 , 1271 – 1318 .
   Web of Science ®Google Scholar
• KAUFMAN , Y. J. , and HOLBEN , B. N. , 1990 , Calibration of AVHRR visible and near-IR bands by atmospheric scattering, ocean glint and. desert reflection. Journal of Applied Meteorology , ( submitted ).
   Google Scholar
• KIRDIASHEV , K. P. , CHUKHLANTSEV , A. A. , and SHUTKO , A. M. , 1979 , Microwave radiation of the earth's surface in the presence of vegetation cover. Radio Science and Electronics , 24 , 256 – 264 .
   Google Scholar
• KNIPLING , E. B. , 1970 , Physical and physiological basis for reflectance of visible and near-infrared radiation from vegetation. Remote Sensing of Environment , 1 , 155 – 159 .
   Google Scholar
• KUMAR , M. , and MONTEITH , J. L. , 1981 , Remote sensing of crop growth. In Plant and the Daylight Spectrum , edited by H. Smith ( New York : Adademic Press ), pp. 133 – 144 .
   Google Scholar
• MALINGREAU , J.-P. , 1986 , Global vegetation dynamics: satellite observations over Asia. International Journal of Remote Sensing , 7 , 1121 – 1146 .
   Web of Science ®Google Scholar
• MCCUEN , R. H. , 1973 , The role of sensitivity analysis in hydrologic modeling. Journal of Hydrology , 18 , 37 – 53 .
   Google Scholar
• Mo , T. , CHOUDHURY , B. J. , SCHMUGGE , T. J. , WANG , J. R. , and JACKSON , T. J. , 1982 , A model for microwave emission from vegetation-covered fields. Journal of Geophysical Research , 87 , 11229 – 11237 .
   Web of Science ®Google Scholar
• NJOKU , E. G. , and PATEL , I. R. , 1986 , Observations of the seasonal variability of soil moisture and vegetation cover over Africa using satellite microwave radiometry. Proceedings of the International Satellite Land-Surface Climatography Project held in Rome, Italy, in October 1985. , ESA SP-248 ( Paris : European Space Agency ), pp. 349 – 353 .
   Google Scholar
• PALOSCIA , S. , and PAMPALONI , P. , 1984 , Microwave remote sensing of plant water stress. Remote Sensing of Environment , 16 , 249 – 255 .
   Web of Science ®Google Scholar
• PAMALONI , P. , and PALOSCIA , S. , 1985 , Experimental relationship between microwave emission and vegetation features. International Journal of Remote Sensing , 6 , 315 – 323 .
   Web of Science ®Google Scholar
• PAMPALONI , P. , and PALOSCIA , S. , 1986 , Microwave emission and plant water content: A comparison between field measurement and theory. I.E.E.E. Transactions on Geoscience Remote Sensing , 24 , 900 – 905 .
   Web of Science ®Google Scholar
• PETERSON , D. L. , SPANNER , M. A. , RUNNING , S. W. , and TEUBER , K. B. , 1987 , Relationship of Thematic Mapper Simulator data to leaf area index of temperate coniferous forests: Remote Sensing of Environment , 22 , 323 – 341 .
   Web of Science ®Google Scholar
• PRICE , J. C. , 1984 , Land surface temperate measurements from the split window channels of the NOAA-7 Advanced Very High Resolution Radiometer. Journal of Geophysical Research , 89 , 7231 – 7237 .
   Web of Science ®Google Scholar
• PRINCE , S. D. , and CHOUDHURY , B. J. , 1989 , Interpretation of Nimbus 37 GHz microwave brightness temperature data in semi-arid southern Africa. International Journal of Remote Sensing , 10 , 1643 – 1661 .
   Web of Science ®Google Scholar
• RASOOL , S. I. , 1987 , Potential of Remote Sensing for the Study of Global Change , ( New York : Pergamon Press ).
   Google Scholar
• Ross , J. , 1981 , The Radiation Regime and Architecture of Plant Stands , ( Boston : Dr W. Junk Publishers ).
   Google Scholar
• RUCK , G. T. , BARRICK , D. E. , STUART , W. D. , and KRICHBAUM , C. K. , 1970 , Radar Cross Section Handbook , ( New York : Plenum ).
   Google Scholar
• SCHMUGGE , T. J. , O'NEILL , P. E. , and WANG , J. R. , 1986 , Passive microwave soil moisture research. I.E.E.E. Transactions on Geoscience and Remote Sensing , 24 , 12 – 22 .
   Web of Science ®Google Scholar
• SCIIWERING , F. K. , VIOLETTE , E. J. , and ESPELAND , R. H. , 1988 , Millimeter-wave propagation in vegetation: Experiment and theory. I.E.E.E. Transactions on Geoscience and Remote Sensing , 26 , 355 – 367 .
   Web of Science ®Google Scholar
• SENIOR , T. B. A. , SARABANDI , K. , and ULABY , F. T. , 1987 , Measurement and modeling the backscattering cross section of a leaf. Radio Science , 22 , 1109 – 1116 .
   Web of Science ®Google Scholar
• SOBOLEV , V. V. , 1975 , t:Light Scattering in Planetary Atmospheres ( New York : Pergamon ).
   Google Scholar
• STEPHENS , G. L. , 1988 , Radiative transfer through arbitrarily shaped optical media: I. A. general method of solution. Journal of Atmospheric Science , 45 , 1818 – 1836 .
   Web of Science ®Google Scholar
• TILLMAN , D. , 1981 , Review of mechanisms associated with wood combustion. Wood Science , 13 , 177 – 184 .
   Google Scholar
• TOWNSHEND , J. R. G. , JUSTICE , C. O. and KALB , V. , 1987 , Characteristics of South America land cover types using satellite data. International Journal of Remote Sensing , 8 , 1189 – 1207 .
   Web of Science ®Google Scholar
• TSANG , L. , KONG , J. A. , and SHIN , R. T. , 1985 , Theory of Microwave Remote Sensing , ( New York : Wiley-Interscience ).
   Google Scholar
• ULABY , F. T. , and EL-RAYES , M. A. , 1987 , Microwave dielectric spectrum of vegetation. II. Dual-dispersion model. I.E.E.E. Transactions on Geoscience and Remote Sensing , 25 , 550 – 557 .
   Web of Science ®Google Scholar
• ULABY , F. T. , MOORE , R. K. , and FUNG , A. K. , 1981 , Microwave Remote Sensing , Vol. 1 ( Massachusetts : Addison-Wesley ).
   Google Scholar
• VAN DE HULST , H. C. , 1962 , Light Scattering by Small Particles , ( New York : John Wiley ).
   Google Scholar
• WANG , J. R. , and CHOUDHURY , B. J. , 1981 , Remote sensing of soil moisture content over bare fields at 1–4 GHz frequency. Journal of Geophysical Research , 86 , 5277 – 5282 .
   Web of Science ®Google Scholar
• WATERS , J. W. , 1976 , Absorption and emission of microwave radiation by atmospheric gases. In Methods of Experimental Physics , Vol. 12B , edited by M. L. Meeks ( New York : Academic Press ).
   Google Scholar
• WHITTAKER , R. H. , BORMANN , F. H. , LIKENS , G. E. , and SICCAMA , T. G. , 1974 , The Huggard Brook ecosystem study: Forest biomass and production. Ecological Monographs , 44 , 233 – 252 .
   Web of Science ®Google Scholar
• WHITTAKER , R. H. , and WOODWELL , G. M. , 1967 , Surface area relations of woody plants and forest communities. American Journal of Botany , 54 , 931 – 939 .
   Web of Science ®Google Scholar
• WILLIAMS , D. L. , 1989 , The radiative transfer characteristics of Spruce (Picea spp.): Implications relative to the canopy microclimate. Report 890502, Department of Geography, University of Maryland, Maryland .
   Google Scholar
• ZOUGHI , R. , Wu , L. K. , and MOORE , R. K. , 1986 , Identification of major backscattering sources in trees and shrubs al 10 GHz. Remote Sensing of Environment , 19 , 269 – 290 .
   Web of Science ®Google Scholar