Hydrographic observations in Elkhorn Slough and Moss Landing Harbor, California, October 1970 to November 1971. Annual report, Part 3, July 1972

In October 1970, Moss Landing Marine Laboratories began an observational program to determine/the seasonal changes in the water chemistry of Elkhorn Slough and Moss Landing Harbor. This data report contains the first year of data (October 1970 - November 1971). These data are of immediate interest in determining the flushing and mixing mechanisms of the slough and in establishing the effect that local domestic and industrial effluents have on the distribution of these chemical parameters. (Document contains 78 Pages)

Oceanographic Observations in Monterey Bay, California, January 1972 to April 1973: Annual Report, Part 3, 1973

This report completes the hydrographic data series obtained during 27 monthly oceanographic cruises in Monterey Bay. This oceanographic study was initiated under a grant from the Office of Sea Grant Programs, and the data collection began in February 1971. In September 1971 additional funding was received from the Association of Monterey Bay Area Governments. The data obtained during 1971 have been published previously (Broenkow 1972), and some initial interpretation of this work has been reported by Smethie (1973), Broenkow and Smethie (1973), and Oceanographic Services, Inc. (1973). (PDF contains 336 pages)

A report of biological observations at Topanga artificial reef and Santa Monica Bay artificial reef

(Document pdf contains 25 pages)

Observations of the biological communities at Bolsa Chica artificial reef

Bolsa Chica Artificial Reef (BCAR) was constructed in November 1986 with 10,400 tons of concrete rubble and eight concrete and steel barges. Prior to any additional augmentation of BCAR, the u.s. Army Corps of Engineers and the California Coastal Commission required the California Department of Fish and Game (CDFG) to survey the bioloqical communities on and around BCAR. In April 1992, qualitative surveys of the biological communities were conducted on one of the eight modules at BCAR and at a nearby sand-only site. One of the modules, Module D, located in 90 feet of water (MLLW), was surveyed for fish, macroinvertebrates, and turf community organisms (small plants and sessile animals). Twelve species of fish were observed, including kelp bass (Paralabrax clathratus) and barred sand bass (P. nebulifer). Eight macroinvertebrate species were observed, rock scallops (Crassedoma giganteum) being the most abundant. The turf community was comprised of thirteen invertebrate taxa, among which erect ectoprocts (Bugula spp.) were the most numerous. Two species of foliose red algae (Rhodymenia pacifica and Anisocladella pacifica) were also observed. The reef has reached an advanced stage of successional development with fish and invertebrate communities diverse and well established. However, due,.to its depth and the turbidity of surrounding waters, this reef is not likely to ever support a diverse algal community. The diversity and abundance of fish and macroinvertebrates were, as to be expected, much lower in the nearby sand-only site. Only two species of fish and seven macroinvertebrate species were observed. Of these, only the sea pen, Stylatula elongata, was common. Overall, when compared to nearby sand-only habitats, Bolsa Chica Artificial Reef appears to contribute substantially to the local biological productivity. In addition, the concrete rubble used in BCAR' s construction appears to be performing as well as the quarry rock used in all of CDFG's experimental reefs. (Document pdf contains 22 pages)

A report of biological observations at Pacific Beach artificial reef, Oceanside artificial reef, and Santa Monica Bay artificial reef

(Document pdf contains 16 pages)

A report of biological observations at Oceanside #1 and #2 artificial reefs, Carlsbad artificial reef, Pacific Beach artificial reef, and Mission Bay Park artificial reef

(Document pdf contains 22 pages)

Cosmology in an accelerated universe: observations and phenomenology

En las últimas décadas la cosmología ha experimentado notables avances como consecuencia del desarrollo de nuevos experimentos que nos han abastecido con precisos datos observacionales. La calidad de estos datos ha permitido construir una imagen global del universo actual; un universo acelerado compuesto principalmente por materia oscura (23%) distinta a la materia ordinaria (5%), y energía oscura (70%), la componente del universo que contrarresta el efecto gravitatorio y explica la expansión acelerada de éste. Con la existencia de estas dos principales componentes se puede explicar la situación actual del universo y los fenómenos que tienen lugar en él. Sin embargo, su naturaleza es todavía un misterio, por lo que nos encontramos ante un largo y apasionante camino que recorrer.Es en este contexto donde se enmarca el trabajo presentado en esta tesis, cuyo principal objetivo es ir más allá y obtener algunas pistas nuevas sobre la naturaleza de la energía oscura. Las investigaciones llevadas a cabo durante esta tesis tratan de hacer frente a este sector ¿oscuro" desde varias perspectivas, combinando la teoría y el análisis de datos astronómicos.Como primer acercamiento, en el capítulo 2 se propone un nuevo modelo para unificar el sector ¿oscuro¿: materia y energía oscura. En los capítulos 3 y 4 se aborda el problema de la energía oscura desde una nueva perspectiva y se presentan unas nuevas parametrizaciones de la ecuación de estado de la energía oscura. Por último, en el capítulo 5, a través de los datos del fondo cósmico de microondas, se da un paso más allá en física de las épocas tempranas del universo, y se obtienen restricciones sobre el exceso de densidad de radiación observado. Por otra parte, se da una explicación a este fenómeno: se atribuye este exceso al fondo cósmico de ondas gravitacionales primordiales producido por las cuerdas cósmicas, bajo condiciones adiabáticas.