We thank Dr. John Christy for providing the MSU data, including those shown in Figs. 12 and 13. We also thank Liz Stephens for preparing Fig. 3 and Mark Berliner, Chris Wilde, Tim Hoar, and Barbara Bailey for their assistance on the statistical analysis, in particular Fig. 11 and Table 1. Dennis Shea and Doug Lindholm assisted with the preparation and analysis of the Australian radiosonde data. We thank the anonymous reviewers for their critical comments and suggestions. This research is partly sponsored by NOAA under Grant NA56GP0247 and by NASA under NASA Order No. W-18,077.
Andersson, E., A. Hollingsworth, G. Kelly, P. Lönnberg, J. Pailleux, and Z. Zhang, 1991: Global observing system experiments on operational statistical retrievals of satellite sounding data. Mon. Wea. Rev.,119, 1851–1864.
Angell, J. K., 1988: Variations and trends in tropospheric and stratospheric global temperatures, 1958–87. J. Climate,1, 1296–1313.
Basist, A. N., and M. Chelliah, 1997: Comparison of tropospheric temperature derived from the NCEP/NCAR reanalysis, NCEP operational analysis and the Microwave Sounding Unit. Bull. Amer. Meteor. Soc.,78, 1431–1447.
——, C. F. Ropelewski, and N. C. Grody, 1995: Comparison of tropospheric temperature derived from the Microwave Sounding Unit and the National Meteorological Center Analysis. J. Climate,8, 668–681.
Chen, D., S. E. Zebiak, A. J. Busalacchi, and M. A. Cane, 1995: An improved procedure for El Niño forecasting: Implications for predictability. Science,269, 1699–1702.
Chiu, L. S., A. T. C. Chang, and J. Janowiak, 1993: Comparison of monthly rain rates derived from GPI and SSM/I using probability distribution functions. J. Appl. Meteor.,32, 323–334.
Christy, J. R., 1995: Temperature above the surface layer. Climate Change,31, 455–474.
——, and R. T. McNider, 1994: Satellite greenhouse warming. Nature,367, 325.
——, and R. W. Spencer, 1995: Assessment of precision in temperatures from the microwave sounding units. Climate Change,30, 97–102.
——, ——, and R. T. McNider, 1995: Reducing noise in the MSU daily lower-tropospheric global temperature dataset. J. Climate,8, 888–896.
——, ——, and E. Lobi, 1998: Analysis of the merging procedure for the MSU daily temperature time series. J. Climate, in press.
Cryer, J. D., 1986: Time Series Analysis. Duxbury Press, 286 pp.
Deser, C., and M. Timlin, 1997: Atmosphere–ocean interaction on weekly time scales in the North Atlantic and Pacific. J. Climate,10, 393–408.
Diaz, H. F., and N. E. Graham, 1996: Recent changes in tropical freezing heights and the role of sea surface temperature. Nature,383, 152–155.
Elliott, W. P., and D. J. Gaffen, 1991: On the utility of radiosonde humidity archives for climate studies. Bull. Amer. Meteor. Soc.,72, 1507–1520.
——, ——, J. D. W. Kahl, and J. K. Angell, 1994: The effect of moisture on layer thicknesses used to monitor global temperatures. J. Climate,7, 304–308.
Eyre, J. R., 1987: On systematic errors in satellite sounding products and their climatological mean values. Quart. J. Roy. Meteor. Soc.,113, 279–292.
Gaffen, D. J., 1993: Historical changes in radiosonde instruments and practices. WMO/TD-No. 541, Instruments and Observing Methods Rep. 50, World Meteorological Organization, 123 pp.
——, 1994: Temporal inhomogeneities in radiosonde temperature records. J. Geophys. Res.,99, 3667–3676.
——, 1996: A digitized metadata set of global upper-air station histories. NOAA Tech. Memo. ERL ARL-211, 38 pp. [Available from National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22161.].
——, R. E. Habermann, and J. R. Lanzante, 1997: Toward estimating stratospheric temperature trends with radiosonde data. Stratospheric processes and their role in climate (SPARC). Proc. First SPARC General Assembly, Melbourne, Australia, World Meteorological Organization, 197–200.
Gates, W. L., 1992: AMIP: The Atmospheric Model Intercomparison Project. Bull. Amer. Meteor. Soc.,73, 1962–1970.
Gibson, R., P. Kållberg, and S. Uppala, 1996: The ECMWF Re-Analysis (ERA) Project. ECMWF Newsletter,73, 7–17.
Goldberg, M. D., and D. S. Crosby, 1995: NOAA’s MSU time series for detecting climate change. Proc. 20th Annual Climate Diagnostics Workshop, Seattle, WA, NOAA/Climate Prediction Center and the Joint Institute for the Study of Atmosphere and Ocean, University of Washington, 345–348.
——, and H. E. Fleming, 1995: An algorithm to generate deep-layer temperatures from microwave satellite observations for the purpose of monitoring climate change. J. Climate,8, 993–1004.
Hansen, J., and H. Wilson, 1993: Commentary on the significance of global temperature records. Climate Change,25, 185–191.
——, H. Wilson, M. Sato, R. Ruedy, K. Shah, and E. Hansen, 1995:Satellite and surface temperature data at odds? Climate Change,30, 103–117.
——, and Coauthors, 1996: A Pinatubo climate modeling investigation. Global Environmental Change, G. Fiocco, D. Fua’, and G. Visconti, Eds., NATO ASI Series, Vol. 42, Springer-Verlag, 233–272.
Horel, J. D., and J. M. Wallace, 1981: Planetary scale atmospheric phenomena associated with the Southern Oscillation. Mon. Wea. Rev.,109, 813–829.
Hurrell, J. W., 1996: Influence of variations in extratropical wintertime teleconnections on Northern Hemisphere temperatures. Geophys. Res. Lett.,23, 665–668.
——, and K. E. Trenberth, 1992: An evaluation of monthly mean MSU and ECMWF global atmospheric temperatures for monitoring climate. J. Climate,5, 1424–1440.
——, and ——, 1996: Satellite versus surface estimates of air temperature since 1979. J. Climate,9, 2222–2232.
IPCC, 1996: Climate Change 1995: The Science of Climate Change. Cambridge University Press, 570 pp.
Jones, P. D., 1994: Recent warming in global temperature series. Geophys. Res. Lett.,21, 1149–1152.
——, and K. R. Briffa, 1992: Global surface air temperature variations over the twentieth century. Part 1: Spatial, temporal and seasonal details. Holocene,2, 174–188.
Jones, R. H., and I. Dey, 1995: Determining one or more change points. Chem. Phys. Lipids,76, 1–6.
——, T. J. Osborne, and K. R. Briffa, 1997a: Estimating sampling errors in large-scale temperature averages. J. Climate,10, 2548–2568.
——, ——, T. M. L. Wigley, P. M. Kelly, and B. D. Santer, 1997b: Comparisons between the MSU 2R temperature record and the surface temperature record over 1979 to 1996: Real differences or potential discontinuities? J. Geophys. Res.,102, 30135–30145.
Kalnay, E., and Coauthors, 1996: The NCEP/NCAR 40-year reanalysis project. Bull. Amer. Meteor. Soc.,77, 437–471.
Kaplan, A., M. A. Cane, Y. Kushnir, A. C. Clement, M. B. Blumenthal, and B. Rajagopalan, 1998: Analyses of global sea surface temperature 1856–1991. J. Geophys. Res., in press.
Karl, T. R., R. W. Knight, and J. R. Christy, 1994: Global and hemispheric temperature trends: Uncertainties related to inadequate spatial sampling. J. Climate,7, 1144–1163.
Kelly, G., E. Andersson, A. Hollingsworth, P. Lönnberg, J. Pailleux, and Z. Zhang, 1991: Quality control of operational physical retrievals of satellite sounding data. Mon. Wea. Rev.,119, 1866–1880.
Kiehl, J. T., J. J. Hack, G. B. Bonan, B. A. Boville, B. P. Briegleb, D. L. Williamson, and P. J. Rasch, 1996: Description of the NCAR Community Climate Model (CCM3). NCAR Tech. Note NCAR/TN-420+STR, 152 pp. [Available from NCAR, P.O. Box 3000, Boulder, CO 80307-3000.].
Newell, R. E., and B. C. Weare, 1976: Factors governing tropospheric mean temperatures. Science,194, 1413–1414.
Oort, A. H., and H. Liu, 1993: Upper-air temperature trends over the globe, 1958–1989. J. Climate,6, 292–307.
Overland, J. E., and R. W. Preisendorfer, 1982: A significance test for principal components applied to a cyclone climatology. Mon. Wea. Rev.,110, 1–4.
Parker, D. E., and D. I. Cox, 1995: Towards a consistent global climatological rawinsonde data-base. Int. J. Climatol.,15, 473–496.
——, P. D. Jones, C. K. Folland, and A. Bevan, 1994: Interdecadal changes of surface temperatures since the late 19th century. J. Geophys. Res.,99, 14 373–14 399.
——, M. Gordon, D. P. N. Cullum, D. M. H. Sexton, C. K. Folland, and N. Rayner, 1997: A new global gridded radiosonde temperature data base and recent temperature trends. Geophys. Res. Lett.,24, 1499–1502.
Prabhakara, C., J. J. Nucciarone, and J.-M. Yoo, 1995: Examination of “Global atmospheric temperature monitoring with satellite microwave measurements.” Part 1: Theoretical considerations. Climate Change,30, 349–366.
——, J.-M. Yoo, S. P. Maloney, J. J. Nucciarone, A. Arking, M. Cadeddu, and G. Dalu, 1996: Examination of “Global atmospheric temperature monitoring with satellite microwave measurements.” Part 2: Analysis of satellite data. Climate Change,33, 459–476.
Ramaswamy, V., M. D. Schwarzkopf, and W. J. Randel, 1996: Fingerprint of ozone depletion in spatial and temporal patterns of recent lower stratospheric cooling. Nature,382, 616–618.
Rasmusson, E. M., and T. H. Carpenter, 1982: Variations in tropical sea surface temperature and surface wind fields associated with the Southern Oscillation/El Niño. Mon. Wea. Rev.,110, 354–384.
Reale, A., M. Chalfant, R. Wagoner, T. Gardner, and L. Casey, 1994:TOVS operational sounding upgrades: 1990–1992. NOAA Tech. Rep. NESDIS 76, U.S. Department of Commerce, NOAA, Washington, DC, 67 pp. [Available from National Environmental Satellite, Data, and Information Service, Washington, DC 20233.].
Reynolds, R. W., and T. M. Smith, 1994: Improved global sea surface temperature analyses using optimum interpolation. J. Climate,7, 929–948.
Santer, B. D., and Coauthors, 1996: A search for human influences on the thermal structure of the atmosphere. Nature,382, 39–46.
Schmidlin, F. J., and F. G. Finger, 1987: Conclusions and recommendations resulting from the WMO international radiosonde comparison. Proc. Sixth Symp. on Meteorological Observations and Instrumentation, New Orleans, LA, Amer. Meteor. Soc., 459–462.
Shah, K. P., and R. Rind, 1995: Use of microwave brightness temperatures with a general circulation model. J. Geophys. Res.,100, 13 841–13 874.
Shukla, J., and M. J. Fennessy, 1988: Prediction of time-mean atmospheric circulation and rainfall: Influence of Pacific sea surface temperature anomaly. J. Atmos. Sci.,45, 9–28.
Slutz, R. J., S. J. Lubker, J. D. Hiscox, S. D. Woodruff, R. L. Jenne, D. H. Joseph, P. M. Steurer, and J. D. Elms, 1985: COADS: Comprehensive Ocean–Atmosphere Data Set. Release 1, 262 pp.
Smith, T. M., R. W. Reynolds, R. E. Livezey, and D. C. Stokes, 1996:Reconstruction of historical sea surface temperatures using empirical orthogonal functions. J. Climate,9, 1403–1420.
Spencer, R. W., and J. R. Christy, 1992a: Precision and radiosonde validation of satellite gridpoint temperature anomalies. Part I: MSU channel 2. J. Climate,5, 847–857.
——, and ——, 1992b: Precision and radiosonde validation of satellite gridpoint temperature anomalies. Part II: A tropospheric retrieval and trends during 1979–90. J. Climate,5, 858–866.
——, ——, and N. C. Grody, 1990: Global atmospheric temperature monitoring with satellite microwave measurements: Method and results 1979–1984. J. Climate,3, 1111–1128.
——, ——, and ——, 1996: Analysis of ‘Examination of “Global atmospheric temperature monitoring with satellite microwave measurements.”’ Climate Change,33, 477–489.
Stendel, M., and L. Bengtsson, 1997: Toward monitoring the tropospheric temperature by means of a general circulation model. J. Geosphys. Res.,102, 29779–29788.
Stone, P. H., and J. H. Carlson, 1979: Atmospheric lapse rate regimes and their parameterization. J. Atmos. Sci.,36, 415–423.
Tett, S. F. B., J. F. B. Mitchell, D. E. Parker, and M. R. Allen, 1996:Human influence on the atmospheric vertical temperature structure: Detection and observations. Science,274, 1170–1173.
Thompson, L. G., E. Mosley-Thompson, M. E. Davis, P.-N. Lin, K. A. Henderson, J. Cole-Dai, J. F. Bolzan, and K.-B. Liu, 1995: Late glacial stage and holocene tropical ice core records from Huascarán, Peru. Science,269, 46–50.
Trenberth, K. E., 1984: Signal versus noise in the Southern Oscillation. Mon. Wea. Rev.,112, 326–332.
——, and J. G. Olson, 1991: Representativeness of a 63-station network for depicting climate changes. Greenhouse-Gas-Induced Climatic Change: A Critical Appraisal of Simulations and Observations, M. E. Schlesinger, Ed., Elsevier Science, 249–260.
——, and C. J. Guillemot, 1998: Evaluation of the atmospheric moisture and hydrological cycle in the NCEP reanalyses. Climate Dyn., in press.
——, J. R. Christy, and J. W. Hurrell, 1992: Monitoring global monthly mean surface temperatures. J. Climate,5, 1405–1423.
Waliser, D. E., and W. Zhou, 1997: Removing satellite equatorial crossing time biases from the OLR and HRC datasets. J. Climate,10, 2125–2146.
Wallace, J. M., Y. Zhang, and J. A. Renwick, 1995: Dynamic contribution to hemispheric mean temperature trends. Science,270, 780–783.
Xie, P., and P. A. Arkin, 1996: Analyses of global monthly precipitation using gauge observations, satellite estimates, and numerical model predictions. J. Climate,9, 840–858.
Yulaeva, E., and J. M. Wallace, 1994: The signature of ENSO in global temperature and precipitation fields derived from the Microwave Sounding Unit. J. Climate,7, 1720–1736.