A Study Of Light Attenuation In Monterey Bay California

The distribution of suspended particulate matter in the 1.4 to 27.9 micron range based on data gathered during four cruises off the California coast from San Francisco Bay to Cape San Martin is presented by means of isometric drawings as well as more conventional graphs. It was observed that pycnoclines set up particle 'traps'. In areas where a deep mixed layer existed particle concentrations were randomly distributed in the layer. Counts of larger sized particles decreased with depth; those for smaller particles appeared to remain about constant throughout the water column. Particle sizes and distributions reflected bottom topography and water depth. Shallow water stations exhibited higher particle concentrations, while stations over Monterey Canyon showed depressed counts over the entire size range. In localized upwelling areas higher concentrations around the areas' peripheries than in their centers were found. C values generally occurred in the 2.4 to 3.1 range, but significant deviations were noted during upwelling. K values often fell in the 50 to 300 x 103 particles/m1 range, but extremely high values were noted for the Davidson Current period. Phytoplankton blooms appeared to be responsible for 'knees' or 'peaks' in many of the size distributions.

Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by TPRC at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemina tion phases of the activity was transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we have concluded that it will be in the interest of all concerned if the printing and distribution of the volume were handled by a well-known publishing house to assure improved service and better communication. Hence, effective with this Volume 18, Masters Theses in the Pure and Applied Sciences will be disseminated on a worldwide basis by Plenum Publishing Corporation of New York. All back issues can also be ordered from Plenum. As we embark on this new partnership with Plenum, we also initiate a new venture in that this important annual reference work now covers Canadian universities as well as those in the United States. We are sure that this broader base will greatly enhance the value of these volumes.

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Eighty-six oceanographic stations were occupied in the waters between Monterey Bay and San Francisco Bay during the period 7-14 November 1969. Values of beam transmittance, oxygen content, particulate count, and temperatures were obtained from the surface to 100 meters. These parameters were analyzed and compared by means of depth profiles, horizontal contours and vertical contours. The average sea surface temperature during this period was 14.44C. The northern part of Monterey Bay had the lowest values of beam transmittance and highest values of particulate count. The California Current appears to be flowing southward down the coast at depths above 60 meters and entering Monterey Bay where it sinks to a depth of at least 61 meters. Indications of downwelling are present off the coast between Pt. Ano Nuevo and Santa Cruz and this is attributed to the northward flowing Davidson URRENT IMPINGING ON THE SHORE ANDn Current impinging on the shore and sinKING. A layer of maximum particulate count was often found to exist within the thermocline. (Author).