The construction and preliminary statistical analysis of the merged dataset of surface observations and ISCCP cloud retrievals were done by Alison Walker, who also assisted us in working with this dataset. Stephen Klein and an anonymous reviewer provided helpful suggestions to improve the manuscript. This work was supported in part by a joint NSF-NOAA Grant ATM-95-10170.
Chambers, W. L., B. A. Wielicki, and K. F. Evans, 1997: Accuracy of the independent-pixel approximation for satellite estimates of oceanic boundary layer cloud optical depth. J. Geophys. Res.,102, 1779–1794.
Chen, T., W. B. Rossow, and Y.-C. Zhang, 2000: Radiative effects of cloud-type variations. J. Climate,13, 264–286.
Hahn, C. J., and S. G. Warren, 1999: Extended edited synoptic cloud reports from ships and land stations over the globe, 1952–1996. Numerical Data Package NDP-026C, 71 pp. [Available from Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6335.].
——, ——, and J. London, 1995: The effect of moonlight on observation of cloud cover at night, and application to cloud climatology. J. Climate,8, 1429–1446.
——, ——, and ——, 1996: Edited synoptic cloud reports from ships and land stations over the globe, 1982–1991. Numerical Data Package NDP-026B, 47 pp. [Available from Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831–6335.].
Han, Q., W. B. Rossow, and A. A. Lacis, 1994: Near-global survey of effective cloud droplet radii in liquid water clouds using ISCCP data. J. Climate,7, 465–497.
Houze, R. A., Jr., 1993: Cloud Dynamics. Academic Press, 573 pp.
——, 1997: Stratiform precipitation in regions of convection: A meteorological paradox? Bull. Amer. Meteor. Soc.,78, 2179–2195.
Jin, Y., and W. B. Rossow, 1997: Detection of cirrus overlapping low-level clouds. J. Geophys. Res.,102, 1727–1737.
——, ——, and D. P. Wylie, 1996: Comparison of the climatologies of high-level clouds from HIRS and ISCCP. J. Climate,9, 2850–2879.
Johnson, R. H., T. M. Rickenbach, S. A. Rutledge, P. E. Ciesielski, and W. H. Schubert, 1999: Trimodal characteristics of tropical convection. J. Climate,12, 2397–2418.
Lau, N.-C., and M. W. Crane, 1995: A satellite view of the synoptic-scale organization of cloud properties in midlatitude and tropical circulation systems. Mon. Wea. Rev.,123, 1984–2006.
——, and ——, 1997: Comparing satellite and surface observations of cloud patterns in synoptic-scale circulation systems. Mon. Wea. Rev.,125, 3172–3189.
Liao, X., W. B. Rossow, and D. Rind, 1995: Comparison between SAGE II and ISCCP high-level clouds. Part I: Global and zonal mean cloud amounts. J. Geophys. Res.,100, 1121–1135.
Machado, L. A. T., and W. B. Rossow, 1993: Structural characteristics and radiative properties of tropical cloud clusters. Mon. Wea. Rev.,121, 3234–3260.
Minnis, P., K.-N. Liou, and Y. Takano, 1993: Inference of cirrus cloud properties using satellite-observed visible and infrared radiances. Part I: Parameterization of radiance fields. J. Atmos. Sci.,50, 1279–1304.
Pincus, R., S. A. McFarlane, and S. A. Klein, 1999: Albedo bias and the horizontal variability of clouds in subtropical marine boundary layers: Observations from ships and satellites. J. Geophys. Res.,104, 6183–6191.
Ramage, C. S., 1971: Monsoon Meteorology. Academic Press, 296 pp.
Rossow, W. B., and R. A. Schiffer, 1991: ISCCP cloud data products. Bull. Amer. Meteor. Soc.,72, 2–20.
——, and ——, 1999: Advances in understanding clouds from ISCCP. Bull. Amer. Meteor. Soc.,80, 2261–2257.
——, L. C. Garder, P. J. Lu, and A. W. Walker, 1991: International Satellite Cloud Climatology Project (ISCCP), documentation of cloud data. WMO/TD-266 (revised), World Climate Research Programme (ICSU and WMO), Geneva, Switzerland, 76 pp. plus 3 appendixes.
——, A. W. Walker, and L. C. Garder, 1993: Comparison of ISCCP and other cloud amounts. J. Climate,6, 2394–2418.
——, ——, D. E. Beuschel, and M. D. Roiter, 1996: International Satellite Cloud Climatology Project (ISCCP) documentation of new cloud datasets. WMO/TD-737, World Climate Research Programme (ICSU and WMO), Geneva, Switzerland, 115 pp.
Sassen, K., and B. S. Cho, 1992: Subvisual–thin cirrus lidar dataset for satellite verification and climatological research. J. Appl. Meteor.,31, 1275–1285.
Schweiger, A. J., and J. R. Key, 1992: Arctic cloudiness: Comparison of ISCCP-C2 and Nimbus-7 satellite-derived cloud products with a surface-based cloud climatology. J. Climate,5, 1514–1527.
Twohy, C. H., A. D. Clarke, S. G. Warren, L. F. Radke, and R. J. Charlson, 1989: Light-absorbing material extracted from cloud droplets and its effect on cloud albedo. J. Geophys. Res.,94, 8623–8631.
Wang, J., W. B. Rossow, T. Uttal, and M. Rozendaal, 1999: Variability of cloud vertical structure during ASTEX observed from a combination of rawinsonde, radar, ceilometer, and satellite. Mon. Wea. Rev.,127, 2484–2502.
——, ——, and Y. Zhang, 2000: Cloud vertical structure and its variations from a 20-yr global rawinsonde dataset. J. Climate,13, 3041–3056.
Warren, S. G., C. J. Hahn, and J. London, 1985: Simultaneous occurrence of different cloud types. J. Climate Appl. Meteor.,24, 658–667.
——, ——, ——, R. M. Chervin, and R. L. Jenne, 1986: Global distribution of total cloud cover and cloud type amounts over land. NCAR Tech. Note TN-273 + STR, Boulder, CO, 29 pp. and 200 maps.
——, ——, ——, ——, and ——, 1988: Global distribution of total cloud cover and cloud type amounts over the ocean. NCAR Tech. Note TN-317 + STR, Boulder, CO, 42 pp. and 170 maps.
Wielicki, B. A., and L. Parker, 1992: On the determination of cloud cover from satellite sensors: The effect of sensor spatial resolution. J. Geophys. Res.,97, 12 799–12 823.
WMO, 1974: Manual on Codes. Vol. 1. WMO Publ. 306, World Meteorological Organization, 348 pp.
——, 1975: International Cloud Atlas. Vol. 1. World Meteorological Organization, 155 pp.
——, 1987: International Cloud Atlas. Vol. 2. World Meteorological Organization, 212 pp.
Woodruff, S. D., R. J. Slutz, R. L. Jenne, and P. M. Steurer, 1987: A Comprehensive Ocean-Atmosphere Data Set. Bull. Amer. Meteor. Soc.,68, 1239–1250.
Wylie, D., P. Piironen, W. Wolf, and E. Eloranta, 1995: Understanding satellite cirrus cloud climatologies with calibrated lidar optical depths. J. Atmos. Sci.,52, 4327–4343.