Editorial Type:
Article
Article Type:
Research Article

Changes in Cloud-Ceiling Heights and Frequencies over the United States since the Early 1950s

Bomin Sun NOAA/National Climatic Data Center, and STG, Inc., Asheville, North Carolina

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Thomas R. Karl NOAA/National Climatic Data Center, Asheville, North Carolina

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Dian J. Seidel NOAA/Air Resources Laboratory, Silver Spring, Maryland

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Print Publication:
01 Aug 2007
DOI:
https://doi.org/10.1175/JCLI4213.1
Page(s):
3956–3970
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Abstract

U.S. weather stations operated by NOAA’s National Weather Service (NWS) have undergone significant changes in reporting and measuring cloud ceilings. Stations operated by the Department of Defense have maintained more consistent reporting practices. By comparing cloud-ceiling data from 223 NWS first-order stations with those from 117 military stations, and by further comparison with changes in physically related parameters, inhomogeneous records, including all NWS records based only on automated observing systems and the military records prior to the early 1960s, were identified and discarded. Data from the two networks were then used to determine changes in daytime ceiling height (the above-ground height of the lowest sky-cover layer that is more than half opaque) and ceiling occurrence frequency (percentage of total observations that have ceilings) over the contiguous United States since the 1950s.

Cloud-ceiling height in the surface–3.6-km layer generally increased during 1951–2003, with more significant changes in the period after the early 1970s and in the surface–2-km layer. These increases were mostly over the western United States and in the coastal regions. No significant change was found in surface–3.6-km ceiling occurrence during 1951–2003, but during the period since the early 1970s, there is a tendency for a decrease in frequency of ceilings with height below 3.6 km. Cloud-ceiling heights above 3.6 km have shown no significant changes in the past 30 yr, but there has been an increase in frequency, consistent with the increase in ceiling height below 3.6 km. For the surface–3.6-km layer, physically consistent changes were identified as related to changes in ceiling height and frequency of occurrence. This included reductions in precipitation frequency related to low ceiling frequency, and surface warming and decreasing relative humidity accompanying increasing ceiling heights during the past 30 yr.

Corresponding author address: Dian J. Seidel, NOAA/Air Resources Laboratory (R/ARL), 1315 East–West Highway, Silver Spring, MD 20910. Email: Dian.Seidel@noaa.gov

Abstract

U.S. weather stations operated by NOAA’s National Weather Service (NWS) have undergone significant changes in reporting and measuring cloud ceilings. Stations operated by the Department of Defense have maintained more consistent reporting practices. By comparing cloud-ceiling data from 223 NWS first-order stations with those from 117 military stations, and by further comparison with changes in physically related parameters, inhomogeneous records, including all NWS records based only on automated observing systems and the military records prior to the early 1960s, were identified and discarded. Data from the two networks were then used to determine changes in daytime ceiling height (the above-ground height of the lowest sky-cover layer that is more than half opaque) and ceiling occurrence frequency (percentage of total observations that have ceilings) over the contiguous United States since the 1950s.

Cloud-ceiling height in the surface–3.6-km layer generally increased during 1951–2003, with more significant changes in the period after the early 1970s and in the surface–2-km layer. These increases were mostly over the western United States and in the coastal regions. No significant change was found in surface–3.6-km ceiling occurrence during 1951–2003, but during the period since the early 1970s, there is a tendency for a decrease in frequency of ceilings with height below 3.6 km. Cloud-ceiling heights above 3.6 km have shown no significant changes in the past 30 yr, but there has been an increase in frequency, consistent with the increase in ceiling height below 3.6 km. For the surface–3.6-km layer, physically consistent changes were identified as related to changes in ceiling height and frequency of occurrence. This included reductions in precipitation frequency related to low ceiling frequency, and surface warming and decreasing relative humidity accompanying increasing ceiling heights during the past 30 yr.

Corresponding author address: Dian J. Seidel, NOAA/Air Resources Laboratory (R/ARL), 1315 East–West Highway, Silver Spring, MD 20910. Email: Dian.Seidel@noaa.gov

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  • Angell, J. K., 1990: Variations in the United States cloudiness and sunshine duration between 1950 and the drought year 1988. J. Climate, 3 , 296–308.

    • Search Google Scholar
    • Export Citation

  • Campbell, G. G., 2004: View angle dependence of cloudiness and the trend in ISCCP cloudiness. Extended Abstracts, 13th Conf. on Satellite Meteorology and Oceanography, Norfolk, VA, Amer. Meteor. Soc., CD-ROM, P6.7.

  • Chernykh, I. V., and R. E. Eskridge, 1996: Determination of cloud amount and level from radiosonde soundings. J. Appl. Meteor., 35 , 1362–1369.

    • Search Google Scholar
    • Export Citation

  • Chernykh, I. V., and O. A. Alduchov, 2004: Vertical distribution of cloud layers from atmospheric radiosounding data. Izv. Atmos. Oceanic Phys., 40 , 45–59.

    • Search Google Scholar
    • Export Citation

  • Chernykh, I. V., O. A. Alduchov, and R. E. Eskridge, 2001: Trends in low and high cloud boundaries and errors in height determination of cloud boundaries. Bull. Amer. Meteor. Soc., 82 , 1941–1947.

    • Search Google Scholar
    • Export Citation

  • Chernykh, I. V., O. A. Alduchov, and R. E. Eskridge, 2003: Reply. Bull. Amer. Meteor. Soc., 84 , 241–247.

  • Dai, A., T. R. Karl, B. Sun, and K. E. Trenberth, 2006: Recent trends in cloudiness over the United States: A tale of monitoring inadequacies. Bull. Amer. Meteor. Soc., 87 , 597–606.

    • Search Google Scholar
    • Export Citation

  • Del Genio, A. D., and A. B. Wolf, 2000: The temperature dependence of the liquid water path of low clouds in the southern Great Plains. J. Climate, 13 , 3465–3486.

    • Search Google Scholar
    • Export Citation

  • Doran, J. C., and S. Zhong, 1995: Variations in mixed-layer depths arising from inhomogeneous surface conditions. J. Climate, 8 , 1965–1973.

    • Search Google Scholar
    • Export Citation

  • Gaffen, D. J., and R. J. Ross, 1999: Climatology and trends of U.S. surface humidity and temperature. J. Climate, 12 , 811–826.

  • Groisman, P. Ya, R. W. Knight, T. R. Karl, D. R. Easterling, B. Sun, and J. H. Lawrimore, 2004: Contemporary changes of the hydrologic cycle over the contiguous United States: Trends derived from in situ observations. J. Hydrometeor., 5 , 64–85.

    • Search Google Scholar
    • Export Citation

  • Guttman, N. B., and C. B. Baker, 1996: Exploratory analysis of the difference between temperature observations recorded by ASOS and conventional methods. Bull. Amer. Meteor. Soc., 77 , 2865–2873.

    • Search Google Scholar
    • Export Citation

  • Hahn, C. J., and S. G. Warren, 1999: Extended edited synoptic cloud reports from ships and land stations over the globe, 1952–1996. NDP-026C, Carbon Dioxide Information Analysis Center, Oak Ridge, TN, 71 pp.

  • Hahn, C. J., S. G. Warren, 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.

    • Search Google Scholar
    • Export Citation

  • Henderson-Sellers, A., 1992: Continental cloudiness changes this century. GeoJournal, 27 , 255–262.

  • Kaiser, D. P., 2000: Decreasing cloudiness over China: An updated analysis examining additional variables. Geophys. Res. Lett., 27 , 2193–2196.

    • Search Google Scholar
    • Export Citation

  • Karl, T. R., and P. M. Steurer, 1990: Increased cloudiness in the United States during the first half of the twentieth century: Fact or fiction? Geophys. Res. Lett., 17 , 1925–1928.

    • Search Google Scholar
    • Export Citation

  • Karl, T. R., and R. W. Knight, 1998: Secular trends of precipitation amount, frequency, and intensity in the United States. Bull. Amer. Meteor. Soc., 79 , 231–242.

    • Search Google Scholar
    • Export Citation

  • Klein, S. A., and D. L. Hartmann, 1993a: The seasonal cycle of low stratiform clouds. J. Climate, 6 , 1587–1606.

  • Klein, S. A., and D. L. Hartmann, 1993b: Spurious changes in the ISCCP dataset. Geophys. Res. Lett., 20 , 455–458.

  • Lanzante, J. R., 1996: Resistant, robust and nonparametric techniques for the analysis of climate data: Theory and examples, including applications to historical radiosonde station data. Int. J. Climatol., 16 , 1197–1226.

    • Search Google Scholar
    • Export Citation

  • Lott, N. R., R. Baldwin, and P. Jones, 2001: The FCC integrated surface hourly datasets: A new resource of global climate data. NOAA National Climatic Data Center Tech. Rep. 2001-01, Asheville, NC, 42 pp.

  • McKee, T. B., N. J. Doesken, J. Kleist, N. L. Canfield, and M. S. Uhart, 1994: An assessment of temperature, precipitation, and relative humidity data continuity with ASOS. Preprints, 10th Int. Conf. on Interactive Information and Processing Systems (IIPS) for Meteorology, Oceanography, and Hydrology, Nashville, TN, Amer. Meteor. Soc., 222–225.

  • Minnis, P., J. K. Ayers, R. Palikonda, and D. Phan, 2004: Contrails, cirrus, and climate. J. Climate, 17 , 1671–1685.

  • Moore, B., W. L. Gates, L. J. Mata, A. Underdal, R. J. Stouffer, B. Bolin, and A. Ramirez Rojas, 2001: Advancing our understanding. Climate Change 2001: The Scientific Basis, J. T. Houghton et al., Eds., Cambridge University Press, 769–786.

    • Search Google Scholar
    • Export Citation

  • Naud, C. M., J. P. Muller, and E. E. Clothiaux, 2003: Comparison between active sensor and radiosonde cloud boundaries over the ARM Southern Great Plains site. J. Geophys. Res., 108 , 3–12.

    • Search Google Scholar
    • Export Citation

  • Norris, J. R., 1998: Low cloud type over the ocean from surface observations. Part I: Relationship to surface meteorology and the vertical distribution of temperature and moisture. J. Climate, 11 , 369–382.

    • Search Google Scholar
    • Export Citation

  • Norris, J. R., 1999: On trends and possible artifacts in global ocean cloud cover between 1952 and 1995. J. Climate, 12 , 1864–1870.

  • Norris, J. R., 2005: Multidecadal changes in near-global cloud cover and estimated cloud cover radiative forcing. J. Geophys. Res., 110 .D08206, doi:10.1029/2004JD005600.

    • Search Google Scholar
    • Export Citation

  • NWS, 1998: Automated Surface Observing System (ASOS) user’s guide. National Oceanic and Atmospheric Administration (NOAA), Washington, DC, 61 pp.

  • Peterson, T. C., and R. S. Vose, 1997: An overview of the Global Historical Climatology Network temperature database. Bull. Amer. Meteor. Soc., 78 , 2837–2849.

    • Search Google Scholar
    • Export Citation

  • Pinker, R. T., B. Zhang, and E. G. Dutton, 2005: Do satellites detect trends in surface solar radiation? Science, 308 , 850–854.

  • Potter, G. L., and R. D. Cess, 2004: Testing the impact of clouds on the radiation budgets of 19 atmospheric general circulation models. J. Geophys. Res., 109 .D02106, doi:10.1029/2003JD004018.

    • Search Google Scholar
    • Export Citation

  • Richardson, A. D., E. G. Denny, T. G. Siccama, and X. Lee, 2003: Evidence for a rising cloud ceiling in eastern North America. J. Climate, 16 , 2093–2098.

    • Search Google Scholar
    • Export Citation

  • Rossow, W. B., and R. A. Schiffer, 1999: Advances in understanding clouds from ISCCP. Bull. Amer. Meteor. Soc., 80 , 2261–2287.

  • Seidel, D., and I. Durre, 2003: Comments on “Trends in low and high cloud boundaries and errors in height determination of cloud boundaries.”. Bull. Amer. Meteor. Soc., 84 , 237–240.

    • Search Google Scholar
    • Export Citation

  • Steurer, P. M., and M. Bodosky, 2000: Surface Airways Hourly (TD-3280) and Airways Solar Radiation (TD-3281). National Climatic Data Center, Asheville, NC, 50 pp.

  • Sun, B., 2003: Cloudiness over the contiguous United States: Contemporary changes observed using ground-based and ISCCP D2 data. Geophys. Res. Lett., 30 .1053, doi:10.1029/2002GL015887.

    • Search Google Scholar
    • Export Citation

  • Sun, B., and R. S. Bradley, 2004: Reply to comment by N. D. Marsh and H. Svensmark on “Solar influences on cosmic rays and cloud formation: A reassessment.”. J. Geophys. Res., 109 .D14206, doi:10.1029/2003JD004479.

    • Search Google Scholar
    • Export Citation

  • Sun, B., and P. Ya Groisman, 2004: Variations in low cloud cover over the United States during the second half of the twentieth century. J. Climate, 17 , 1883–1888.

    • Search Google Scholar
    • Export Citation

  • Sun, B., P. Ya Groisman, and I. I. Mokhov, 2001: Recent changes in cloud-type frequency and inferred increases in convection over the United States and the former USSR. J. Climate, 14 , 1864–1880.

    • Search Google Scholar
    • Export Citation

  • Sun, B., C. B. Baker, T. R. Karl, and M. D. Gifford, 2005: A comparative study of ASOS and USCRN temperature measurements. J. Atmos. Oceanic Technol., 22 , 679–686.

    • Search Google Scholar
    • Export Citation

  • Wang, J., and W. B. Rossow, 1995: Determination of cloud vertical structure from upper-air observations. J. Appl. Meteor., 34 , 2243–2258.

    • Search Google Scholar
    • Export Citation

  • Wang, J., and W. B. Rossow, 1998: Effects of cloud vertical structure on atmospheric circulation in the GISS GCM. J. Climate, 11 , 3010–3029.

    • Search Google Scholar
    • Export Citation

  • Warren, S. G., C. J. Hahn, L. London, 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, 29 pp.+199 maps.

  • Warren, S. G., R. M. Eastman, and C. J. Hahn, 2007: A survey of changes in cloud cover and cloud types over land from surface observations, 1971–96. J. Climate, 20 , 717–738.

    • Search Google Scholar
    • Export Citation

  • Wild, M., and Coauthors, 2005: From dimming to brightening: Decadal changes in solar radiation at Earth’s surface. Science, 308 , 847–850.

    • Search Google Scholar
    • Export Citation
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