An Estimate of the Daily Variation of Cloudiness Over the GATE A/B Area

View More View Less
  • 1 NOAA National Environmental Satellite Service, Washington, D.C. 20233
© Get Permissions
Full access

Abstract

The daily variation of cloudiness, as measured by the Synchronous Meteorological Satellite (SMS-1), was studied for the GATE A/B area (outer hexagon). The amplitude of the diurnal variation was found to be more pronounced on convectively enhanced days than undisturbed days. A primary maximum in both upper and total cloudiness was observed at 1800 GMT (about 1630 local time) and a secondary maximum at 0900 GMT (0730 local time) was observed in the total cloudiness. The existence of a semidiurnal oscillation in cloudiness suggests the influence of the semidiurnal solar atmospheric tide on the cloudiness. The lack of a nighttime maximum in cloudiness implies no nighttime maximum in precipitation, in contrast to other observations of maritime precipitation.

Abstract

The daily variation of cloudiness, as measured by the Synchronous Meteorological Satellite (SMS-1), was studied for the GATE A/B area (outer hexagon). The amplitude of the diurnal variation was found to be more pronounced on convectively enhanced days than undisturbed days. A primary maximum in both upper and total cloudiness was observed at 1800 GMT (about 1630 local time) and a secondary maximum at 0900 GMT (0730 local time) was observed in the total cloudiness. The existence of a semidiurnal oscillation in cloudiness suggests the influence of the semidiurnal solar atmospheric tide on the cloudiness. The lack of a nighttime maximum in cloudiness implies no nighttime maximum in precipitation, in contrast to other observations of maritime precipitation.

Save