Vertical flux of particulate matter in Alfonso Basin, La Paz Bay, during 2002.

Vertical flux of particulate matter in Alfonso Basin, La Paz Bay, during 2002.

 Every three months during 2002, a 1/8-m2 Technicap PPS-3 time-series sediment trap was moored 50 m above the bottom of Alfonso Basin and provided 7–8 day resolution. Under the dissecting microscope, marine snow was abundant, while fecal pellets varied in number, size (0.25–10 mm) and form....

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Hoofdauteurs: Silverberg, N, Aguirre, F, Aguíñiga, S, Romero, N
Formaat: Online
Taal:eng
Gepubliceerd in: Iniversidad Autónoma de Baja California 2006
Online toegang:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/63
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id oai:cienciasmarinas.com.mx:article-63
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Silverberg, N
Aguirre, F
Aguíñiga, S
Romero, N
spellingShingle Silverberg, N
Aguirre, F
Aguíñiga, S
Romero, N
Vertical flux of particulate matter in Alfonso Basin, La Paz Bay, during 2002.
author_facet Silverberg, N
Aguirre, F
Aguíñiga, S
Romero, N
author_sort Silverberg, N
title Vertical flux of particulate matter in Alfonso Basin, La Paz Bay, during 2002.
title_short Vertical flux of particulate matter in Alfonso Basin, La Paz Bay, during 2002.
title_full Vertical flux of particulate matter in Alfonso Basin, La Paz Bay, during 2002.
title_fullStr Vertical flux of particulate matter in Alfonso Basin, La Paz Bay, during 2002.
title_full_unstemmed Vertical flux of particulate matter in Alfonso Basin, La Paz Bay, during 2002.
title_sort vertical flux of particulate matter in alfonso basin, la paz bay, during 2002.
description  Every three months during 2002, a 1/8-m2 Technicap PPS-3 time-series sediment trap was moored 50 m above the bottom of Alfonso Basin and provided 7–8 day resolution. Under the dissecting microscope, marine snow was abundant, while fecal pellets varied in number, size (0.25–10 mm) and form. Centric diatoms were common year-round, while chain-forming diatoms were clearly abundant only during a two-week period in June. The bulk samples were sieved (1 mm) to remove swimmers, the most frequent being polychaetes and pteropods, followed by gelatinous organisms and, rarely, crustaceans. The material was separated into ten equal parts using a rotary splitter. Four of the splits were rinsed of seawater, dried and weighed to determine the total mass flux. This varied between 0.17 and 2.48 g m–2 d–1. The highest fluxes occurred in February and the lowest in mid- April and late June. The average mass flux (300 g m–2 yr–1) is equivalent to a sediment accumulation rate of 0.4 mm yr–1, similar to that obtained from the dating of sediment cores from the basin. The carbonate fraction, determined by coulometry of the carbon content before and after acidification, was considerable, accounting for 8–26% of the total. The mean (14.6%) is similar to the concentration reported for surficial sediments. Peak concentrations occurred during periods in January, March, May, October and November. The CaCO3 flux averaged 0.128 g m–2 d–1, ranged between 0.036 and 0.304 g m–2 d–1 and was most intense in autumn and winter. The total mass and carbonate fluxes in La Paz Bay are considerably greater than those observed in Guaymas Basin, in the open Gulf of California.
publisher Iniversidad Autónoma de Baja California
publishDate 2006
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/63
_version_ 1715723930055999488
spelling oai:cienciasmarinas.com.mx:article-632019-04-08T23:42:38Z Vertical flux of particulate matter in Alfonso Basin, La Paz Bay, during 2002. Flujo vertical de materia particulada en la Cuenca Alfonso, Bahía de La Paz, durante 2002 Silverberg, N Aguirre, F Aguíñiga, S Romero, N settling particles time-series sediment trap sedimentation hundimiento de partículas trampas de sedimentos de serie de tiempo depositación  Every three months during 2002, a 1/8-m2 Technicap PPS-3 time-series sediment trap was moored 50 m above the bottom of Alfonso Basin and provided 7–8 day resolution. Under the dissecting microscope, marine snow was abundant, while fecal pellets varied in number, size (0.25–10 mm) and form. Centric diatoms were common year-round, while chain-forming diatoms were clearly abundant only during a two-week period in June. The bulk samples were sieved (1 mm) to remove swimmers, the most frequent being polychaetes and pteropods, followed by gelatinous organisms and, rarely, crustaceans. The material was separated into ten equal parts using a rotary splitter. Four of the splits were rinsed of seawater, dried and weighed to determine the total mass flux. This varied between 0.17 and 2.48 g m–2 d–1. The highest fluxes occurred in February and the lowest in mid- April and late June. The average mass flux (300 g m–2 yr–1) is equivalent to a sediment accumulation rate of 0.4 mm yr–1, similar to that obtained from the dating of sediment cores from the basin. The carbonate fraction, determined by coulometry of the carbon content before and after acidification, was considerable, accounting for 8–26% of the total. The mean (14.6%) is similar to the concentration reported for surficial sediments. Peak concentrations occurred during periods in January, March, May, October and November. The CaCO3 flux averaged 0.128 g m–2 d–1, ranged between 0.036 and 0.304 g m–2 d–1 and was most intense in autumn and winter. The total mass and carbonate fluxes in La Paz Bay are considerably greater than those observed in Guaymas Basin, in the open Gulf of California. Se instaló una trampa de sedimentos de series de tiempo Technicap (0.125 m2) anclándola a 50 m del fondo de la Cuenca Alfonso cada tres meses en 2002, con una resolución de 7–8 días. Bajo el estereoscopio, la nieve marina fue abundante y las pelotillas fecales variaron en abundancia, forma y tamaño (0.25–10 mm). Las diatomeas centrales fueron comunes todo el año, pero las diatomeas en cadenas fueron claramente abundantes solamente durante dos semanas en junio. Las muestras brutas fueron tamizadas (malla 1 mm) para separar nadadores y grandes partículas. Los más frecuentes nadadores fueron organismos gelatinosos, poliquetos, pterópodos y raramente crustáceos. Cada muestra fue dividida en diez fracciones iguales. Cuatro de éstas fueron lavadas para eliminar el agua de mar, secadas y pesadas para determinar el flujo de masa total. Estos flujos variaron entre 0.17 y 2.48 g m–2 d–1. Los valores máximos se presentaron en febrero mientras que los mínimos se observaron a mediados de abril y finales de junio. El flujo de masa medio (300 g m–2 año–1) es equivalente a una tasa de acumulación de sedimento de 0.4 mm año–1, valor similar a algunos obtenidos por fechado de núcleos tomados de la cuenca. La fracción carbonatada fue determinada por culometría del carbono total antes y después de acidificación y fue considerable, con porcentajes entre 8% y 26%. El promedio (14.6%) fue similar a la concentración observada en los sedimentos superficiales. Las máximas contribuciones fueron evidentes en los periodos de enero, marzo, mayo, octubre y noviembre. El flujo medio de CaCO3 fue de 0.128 g m–2 d–1, variando entre 0.036 y 0.304 g m–2 d–1, siendo los flujos más intensos en otoño e invierno. Los resultados sugieren que la contribución de carbonatos y el flujo de masa total son más importantes en la Cuenca Alfonso que en la Cuenca Guaymas. Iniversidad Autónoma de Baja California 2006-02-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed research note Nota de investigación arbitrada application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/63 10.7773/cm.v32i1.63 Ciencias Marinas; Vol. 32 No. 1 (2006); 73-82 Ciencias Marinas; Vol. 32 Núm. 1 (2006); 73-82 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/63/45

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