A) Interpret the meteorology apparent in Figures A) and B) above. What time of d

Question

A) Interpret the meteorology apparent in Figures A) and B) above. What time of day is it likely that clouds are present, and why? Be sure to consider both the solar and IR.

B) Interpret the meteorology apparent in Figures C) and D) above. What time of day is it likely that clouds are present, and why? You can use the back side of this paper to answer this question.

Shortwave Radiation Wednesday 26-NOV-2005 8 SOLAR Shortwave Radation DIRECT 8 Solar TA) Solar Irradiance (W/m) 500 Diffuse Total Solar Irradiance (W/m) 500 Diffuse and Total Direct 23-NOV-2006 5 Longwave Radiation 20 26-NOV-2005 5 Longvove Radiction E O Thermal irradiance (W/m?) 240 250 260 270 350 Thermal Irradiance (W/m?) 300 20 3314 Hour (OMT) 23 29-NOV-2006 5 Hour (LST) 26-NOV-2006 Hour (LST) 333.8 354:4 33: 13 18. - 29-Nov-2006 | 30-NOV-2006 -> "Hour (GMT - 26-Nov-2006 | 27-NOV-2006 -> Figure 1. All figures refer to the measured down welling irradiance at Trinidad Head California, an island observatory off the coast of Northern California. Solar irradiance is broken up into "Total" that refers to the total irradiance for a detector that measures the vertical component of irradiance, "Diffuse" that refers to the vertical component of solar radiation when the direct solar beam is block. "DIRECT" refers to a detector that points towards the sun direction rather than one that points vertically as it does for the "Total" and "Diffuse" irradiance measurements. "IR" refers to the vertical component of irradiance for the thermal infrared as measured with a detector oriented the same way as used for the solar diffuse and total irradiance measurements. A) and B) are for 29 Nov 2006, and C) and D) are for 26 Nov 2006. Solar noon occurs near the time of the vertical dashed line in each figure.

Explanation / Answer

A) Between 0 to 5 hours of the day the clouds are most likely to be present. Because the solar radiation is less, as the clouds tend to reflect back the solar radiation even before it enters the earth surface. Also the thermal irradiation is less, as the clouds tend to block the long wavelength thermal radiations fromthe earth surface. Both the effects counter each other but the first effect is more prominent and hence the temperature of the earth is reduced.

B)Between 22 and 24 hours the clouds are most likely to be present.The reason is same as the reason above

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