Report and Analysis of the May 1979 Marine Surface Layer Micrometeorological Experiment at San Nicolas Island, California.
NAVAL RESEARCH LAB WASHINGTON DC
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One hundred thirty-six hours of profile and bulk measurements of momentum, moisture, and sensible heat flux, accompanied by determinations of stability, were made in the marine atmospheric surface layer over the Pacific Ocean from an upwind, low-profile promontory of San Nicolas Island, California, at 33 deg North latitude and 120 deg West longitude. A review of previous marine surface layer profile measurements is presented, and the need for additional high wind speed flux measurements is demonstrated. Extensive analysis of the San Nicolas Island data revealed that the measurements were made upwind and above the internal boundary layer formed by the island. Additionally, a generalized technique was developed for correcting the wind-profile modification induced by the inherent change in elevation associated with many beaches. A comparison with previous profile measurements determined that earlier experimenters had overestimated the accuracy of their humidity measurements and that it was impractical to introduce buoyancy into the stability equation. An analysis performed to determine the relative magnitude of the flux and stability measurement errors associated with both the profile and bulk methods determined that the errors were typically in excess of 100. Recommendations for future bulk method measurements are presented and a simple two level bulk method is proposed. An extensive bibliography is given, and the topic of horizontal homogeneity of the marine boundary layer is discussed.
- Physical and Dynamic Oceanography