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Diurnal Cycle of Surface Radiation Budget

Diurnal Cycle of Surface Radiation Budget. G. L. Smith, P. E. Mlynczak, S. K. Gupta and P. W. Stackhouse. Data Set. Surface Radiation Budget Data Set. 1 o Resolution in Lat/Long equal area. 12 Year set: July 1983 - June 1995 Used Monthly Means for July. Surface radiation flux components:

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Diurnal Cycle of Surface Radiation Budget

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  1. Diurnal Cycle of Surface Radiation Budget G. L. Smith, P. E. Mlynczak, S. K. Gupta and P. W. Stackhouse GIST 23, DWD Offenbach, 27-29 April 2005

  2. Data Set • Surface Radiation Budget Data Set. • 1o Resolution in Lat/Long equal area. • 12 Year set: July 1983 - June 1995 • Used Monthly Means for July. • Surface radiation flux components: Upward, Downward and Net Shortwave and Longwave and Net Total GIST 23, DWD Offenbach, 27-29 April 2005

  3. Computation of Diurnal Cycle • Data given for every 3 hours GMT for each 1ox1o region • Use cubic spline to interpolate for very hour of local time for each region • This gives diurnal cycle for each region GIST 23, DWD Offenbach, 27-29 April 2005

  4. Study for July Diurnal cycle is strongest over land in summer and Northern Hemisphere has more land than Southern Hemisphere. Partition Earth into Land and Ocean. Ignore Coastal or Mixed regions. GIST 23, DWD Offenbach, 27-29 April 2005

  5. Principle Component/Empirical Orthogonal FunctionAnalysis y(x,t) = S PCi(t)xEOFi(x) GIST 23, DWD Offenbach, 27-29 April 2005

  6. Eigenvalues for Land GIST 23, DWD Offenbach, 27-29 April 2005

  7. Shortwave time plots GIST 23, DWD Offenbach, 27-29 April 2005

  8. Downward Shortwave EOF-1 • map GIST 23, DWD Offenbach, 27-29 April 2005

  9. Net Shortwave EOF-1 Time GIST 23, DWD Offenbach, 27-29 April 2005

  10. EOF 1 SW Net GIST 23, DWD Offenbach, 27-29 April 2005

  11. Principal Components, Longwave, Land • Time plots GIST 23, DWD Offenbach, 27-29 April 2005

  12. Up Longwave EOF-1, Land • map GIST 23, DWD Offenbach, 27-29 April 2005

  13. Down LW PCs GIST 23, DWD Offenbach, 27-29 April 2005

  14. Downward Longwave EOF-1. Land • Map GIST 23, DWD Offenbach, 27-29 April 2005

  15. PCs for LW net, Land GIST 23, DWD Offenbach, 27-29 April 2005

  16. Net Longwave EOF-1, Land • Map GIST 23, DWD Offenbach, 27-29 April 2005

  17. PCs total, land GIST 23, DWD Offenbach, 27-29 April 2005

  18. Net Total Radiation EOF-1, Land • Map GIST 23, DWD Offenbach, 27-29 April 2005

  19. Conclusions • SW Down and SW Net are very symmetric about noon: there is little indication of cloudiness variation with time of day • LW shows a shift from noon, indicating warming of surface and of atmosphere (expected) • The first e-value is 95%+ for each component, showing one pattern strongly dominates each component of SRB GIST 23, DWD Offenbach, 27-29 April 2005

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