Editorial Type:
Article
Article Type:
Research Article

Recent Changes in Downward Longwave Radiation at King Sejong Station, Antarctica

Hi Ku Cho Global Environment Laboratory/Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea

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Jhoon Kim Global Environment Laboratory/Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea

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Yeonjin Jung Global Environment Laboratory/Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea

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Yun Gon Lee Global Environment Laboratory/Department of Atmospheric Sciences, Yonsei University, Seoul, South Korea

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Bang Yong Lee Korea Polar Research Institute, KORDI, Inchun, South Korea

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Print Publication:
15 Nov 2008
DOI:
https://doi.org/10.1175/2008JCLI1876.1
Page(s):
5764–5776
Restricted access

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Abstract

Effects of cloud, air temperature, and specific humidity on downward longwave irradiance and their long-term variabilities are examined by analyzing the measurements made at the King Sejong Station in the Antarctic Peninsula during the period of 1996–2006.

It has been shown that the downward longwave irradiance (DLR) is significantly correlated with three variables: air temperature, specific humidity, and cloudiness. Based on the relationship of the three variables with DLR, a multiple linear regression model has been developed in order to evaluate the relative contribution of each of the variables to the variation of DLR. The three variables together explained 75% of all the variance in daily mean DLR. The respective contribution from specific humidity and cloudiness to the variation of DLR was 46% and 23%; thus most of the DLR variability can be explained by the variations in the two variables. The annual mean of longwave cloud forcing shows 52 W m−2 with no remarkable seasonal cycle. It is also noted that the overcast cloud effect gives an increase by 65 W m−2 with respect to clear-sky flux throughout the year. It is suggested that the multiple regression model can be used to estimate the radiative forcings of variables influencing the DLR variability.

A highly significant decrease in DLR with an average of −1.52 W m−2 yr−1 (−0.54% yr−1) is found in an analysis from the time series of the deseasonalized monthly mean values. Accordingly, the atmospheric flux emissivity, air temperature, and specific humidity have also decreased in their time series, while the cloudiness has increased insignificantly. Consequently, it may be concluded that the recent decrease in DLR is mainly attributed to the net cooling effect due to the decrease in air temperature and specific humidity, which overwhelm the slight warming effect in cloudiness. Analysis of mean monthly trends for individual months shows that, as for the annual data, the variations in DLR are mostly associated with those of air temperature, specific humidity, and cloudiness.

Corresponding author address: Jhoon Kim, Global Environment Laboratory/Department of Atmospheric Sciences, 134 Sinchon-dong, Seodaemoon-gu, Seoul 120-749, South Korea. Email: jkim2@yonsei.ac.kr

Abstract

Effects of cloud, air temperature, and specific humidity on downward longwave irradiance and their long-term variabilities are examined by analyzing the measurements made at the King Sejong Station in the Antarctic Peninsula during the period of 1996–2006.

It has been shown that the downward longwave irradiance (DLR) is significantly correlated with three variables: air temperature, specific humidity, and cloudiness. Based on the relationship of the three variables with DLR, a multiple linear regression model has been developed in order to evaluate the relative contribution of each of the variables to the variation of DLR. The three variables together explained 75% of all the variance in daily mean DLR. The respective contribution from specific humidity and cloudiness to the variation of DLR was 46% and 23%; thus most of the DLR variability can be explained by the variations in the two variables. The annual mean of longwave cloud forcing shows 52 W m−2 with no remarkable seasonal cycle. It is also noted that the overcast cloud effect gives an increase by 65 W m−2 with respect to clear-sky flux throughout the year. It is suggested that the multiple regression model can be used to estimate the radiative forcings of variables influencing the DLR variability.

A highly significant decrease in DLR with an average of −1.52 W m−2 yr−1 (−0.54% yr−1) is found in an analysis from the time series of the deseasonalized monthly mean values. Accordingly, the atmospheric flux emissivity, air temperature, and specific humidity have also decreased in their time series, while the cloudiness has increased insignificantly. Consequently, it may be concluded that the recent decrease in DLR is mainly attributed to the net cooling effect due to the decrease in air temperature and specific humidity, which overwhelm the slight warming effect in cloudiness. Analysis of mean monthly trends for individual months shows that, as for the annual data, the variations in DLR are mostly associated with those of air temperature, specific humidity, and cloudiness.

Corresponding author address: Jhoon Kim, Global Environment Laboratory/Department of Atmospheric Sciences, 134 Sinchon-dong, Seodaemoon-gu, Seoul 120-749, South Korea. Email: jkim2@yonsei.ac.kr

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  • Alados-Arboledas, L., J. Vida, and J. I. Jiménez, 1988: Effects of solar radiation on the performance of pyrgeometers with silicon domes. J. Atmos. Oceanic Technol., 5 , 666–670.

    • Search Google Scholar
    • Export Citation

  • Dutton, E. G., R. S. Stone, D. W. Nelson, and B. G. Mendonca, 1991: Recent interannual variations in solar radiation, cloudiness, and surface temperature at the South Pole. J. Climate, 4 , 848–858.

    • Search Google Scholar
    • Export Citation

  • Eppley, 2006: Precision Infrared Radiometer, Mode PIR Instruction sheet. The Eppley Laboratory, 4 pp.

  • Ezekiel, M., and K. A. Fox, 1966: Method of Correlation and Regression Analysis. John Wiley and Sons, 548 pp.

  • Fairall, C. W., P. O. G. Persson, E. F. Bradley, R. E. Payne, and S. A. Anderson, 1998: A new look at calibration and use of Eppley Precision Infrared Radiometers. Part I: Theory and application. J. Atmos. Oceanic Technol., 15 , 1229–1242.

    • Search Google Scholar
    • Export Citation

  • Goody, R. M., and Y. L. Yung, 1989: Atmospheric Radiation: Theoretical Basis. Oxford University Press, 519 pp.

  • Hodgson, D., M. J. Bentley, S. J. Roberts, J. A. Smith, D. E. Sugden, and E. W. Domack, 2006: Examining Holocene stability of Antarctic Peninsula ice shelves. Eos, Trans. Amer. Geophys. Union, 87 .305, doi:10.1029/2006EO310001.

    • Search Google Scholar
    • Export Citation

  • Kiehl, J. T., and K. E. Trenberth, 1997: Earth’s annual global mean energy budget. Bull. Amer. Meteor. Soc., 78 , 197–208.

  • Kim, J., H. K. Cho, Y. Jung, Y. G. Lee, and B. Y. Lee, 2006: Surface energy balance at Sejong Station, King George Island, Antarctica. Atmosphere, 16 , 111–124.

    • Search Google Scholar
    • Export Citation

  • King, J. C., 1994: Recent climate variability in the vicinity of the Antarctic Peninsula. Int. J. Climatol., 14 , 357–369.

  • King, J. C., 1996: Longwave atmospheric radiation over Antarctica. Antarct. Sci., 8 , 105–109.

  • King, J. C., P. S. Anderson, M. C. Smith, and S. D. Mobbs, 1996: The surface energy and mass balance at Halley, Antarctica during winter. J. Geophys. Res., 101 , 19119–19128.

    • Search Google Scholar
    • Export Citation

  • Kondratyev, K. Ya, 1969: Radiation in the Atmosphere. Academic Press, 912 pp.

  • Lee, B. Y., T-Y. Kwon, J-S. Lee, and Y. I. Won, 2002: Surface air temperature variations around the Antarctic Peninsula: Comparison of the west and east sides of the Peninsula. Ocean Polar Res., 24 , 267–278.

    • Search Google Scholar
    • Export Citation

  • Lee, J-S., T-Y. Kwon, B. Y. Lee, H. I. Yoon, and J. W. Kim, 2003: Change of regional atmospheric circulation related with recent warming in the Antarctic Peninsula. Ocean Polar Res., 25 , 503–518.

    • Search Google Scholar
    • Export Citation

  • Liou, K. N., 2002: An Introduction to Atmospheric Radiation. Academic Press, 583 pp.

  • Overall, J. E., and C. J. Klett, 1983: Applied Multivariate Analysis. R. E. Krieger, 500 pp.

  • Philipona, R., and Coauthors, 2001: Atmospheric longwave irradiance uncertainty: Pyrgeometers compared to an absolute sky-scanning radiometer, atmospheric emitted radiance interferometer, and radiative transfer model calculations. J. Geophys. Res., 106 , 28129–28142.

    • Search Google Scholar
    • Export Citation

  • Ramanathan, V., R. D. Cess, E. F. Harrison, P. Minnis, B. R. Barkstrom, E. Ahmad, and D. Hartman, 1989: Cloud radiative forcing and climate: Results from the earth radiation budget experiment. Science, 243 , 57–63.

    • Search Google Scholar
    • Export Citation

  • Reijmer, C. H., and J. Oerlemans, 2002: Temporal and spatial variability of the surface energy balance in Dronning Maud Land, East Antarctica. J. Geophys. Res., 107 .4759, doi:10. 1029/2000JD000110.

    • Search Google Scholar
    • Export Citation

  • Ruckstuhl, C., R. Philipona, J. Morland, and A. Ohmura, 2007: Observed relationship between surface specific humidity, integrated water vapor, and longwave downward radiation at different altitudes. J. Geophys. Res., 112 .D03302, doi:10.1029/2006JD007850.

    • Search Google Scholar
    • Export Citation

  • Schlatter, T. W., 1972: The local surface energy balance and surface temperature region in Antarctica. J. Appl. Meteor., 11 , 1048–1062.

    • Search Google Scholar
    • Export Citation

  • Stanhill, G., and S. Cohen, 1997: Recent changes in solar irradiance in Antarctica. J. Climate, 10 , 2078–2086.

  • Studinger, M., D. Bromwich, B. Csatho, R. Muench, T. Parish, and J. Stith, 2005: Science opportunities for a long-range Antarctic research aircraft. Eos, Trans. Amer. Geophys. Union, 86 .39, doi:10.1029/2005EO040004.

    • Search Google Scholar
    • Export Citation

  • Town, M. S., V. P. Walden, and S. G. Warren, 2005: Spectral and broadband longwave downwelling radiative fluxes, cloud radiative forcing, and fractional cloud cover over the South Pole. J. Climate, 18 , 4235–4252.

    • Search Google Scholar
    • Export Citation

  • Ueno, T., S. Shibata, Y. Irose, and T. Okamoto, 2000: On the pyrgeometers with a shadow disk. J. Aerol. Obs., 60 , 35–38.

  • Van den Broeke, M., C. Reijmer, and R. van de Wal, 2004: Surface radiation balance Antarctica as measured with automatic weather stations. J. Geophys. Res., 109 .D09103, doi:10.1029/2003JD004394.

    • Search Google Scholar
    • Export Citation

  • Vaughan, D. G., and C. S. M. Doake, 1996: Recent atmospheric warming and retreat of ice shelves on the Antarctic Peninsula. Nature, 79 , 328–331.

    • Search Google Scholar
    • Export Citation

  • Wallace, J. M., and D. W. J. Thompson, 2002: The Pacific center of action of the Northern Hemisphere annular mode: Real or artifact? J. Climate, 15 , 1987–1991.

    • Search Google Scholar
    • Export Citation

  • WMO, 2007: Polar meteorology: Understanding global impacts. WMO 1013, 38 pp.

  • Yamanouchi, T., and S. Kawaguchi, 1984: Longwave radiation balance under a strong surface inversion in the katabatic wind zone, Antarctica. J. Geophys. Res., 89 , 11771–11778.

    • Search Google Scholar
    • Export Citation
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