The impact of hurricanes on sedimenting particulate matter in the semi-arid Bahía de La Paz, Gulf of California

Silverberg, Norman; Shumilin, Evgueni; Aguirre-Bahena, Fernando; Rodríguez-Castañeda, A. P.; Sapozhnikov, Dmitry

doi:10.1016/j.csr.2007.06.016

Cited by 18 publications

(9 citation statements)

References 38 publications

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“…The cyclonic eddy has been observed in situ and from satellite information (e.g., [9,41]); however, its impact on nutrients availability and biological production in the Northern GC has not been described. SST and surface chlorophyll a concentrations were lower in the cyclonic eddy than in the surrounding areas, probably because the eddy is formed by the overall circulation of the Gulf rather than by Ekman pumping [7,42]. Therefore, the accumulation of trace elements in zooplankton in this area may be more influenced by diurnal vertical migration than by upwelling effects in the center of the eddy.…”

Section: Terrigenous and Redox-sensitive Elements Assemblagementioning

confidence: 85%

“…The elemental composition calculations of irradiated samples were done using a comparative method with a statistical software developed ad hoc. This procedure provided high-quality information that allowed the calibration, precision, and accuracy of the concentration of elements in the zooplankton to be in the order of 2-5% for Fe and 8-10% for the rest of the elements [7]. The detection limits were 0.03 mg kg −1 (Eu), 0.04 mg kg −1 (Lu), 0.05 mg kg −1 (Co, Sc, and Sm), 0.2 mg kg −1 (Hf, La, Th, U, and Yb), 0.5 mg kg −1 (Cs, Sb, Se, and Ta), 0.8 mg kg −1 (As), 2 mg kg −1 (Cr), 10 mg kg −1 (Zn, and Zr), 15 mg kg −1 (Rb), 50 mg kg −1 (Na), 80 mg kg −1 (Ba), 100 mg kg −1 (Fe and Sr), and 5,000 mg kg −1 (Ca).…”

Section: Methodsmentioning

confidence: 99%

“…To avoid any possible entrainment of elements on the surface of the zooplanktonic organisms, each zooplankton sample was washed three times with distilled water for elimination of fine particulates of trace elements of terrigenous origin [22]. The samples were dried at air temperature and subsequently dried in an electrical oven at 60°C during 24 h. The dried samples were homogenized in an agate mortar, and 50-mg sub-samples were used for neutron activation analysis [1,7]. The set of elements analyzed included major elements (Ca and Na) and the following trace elements: As, Ba, Co, Cr, Cs, Eu, Fe, Hf, La, Lu, Rb, Sb, Sc, Se, Sm, Sr, Ta, Th, U, Yb, Zn, and Zr.…”

Section: Methodsmentioning

confidence: 99%

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Major and Trace Elements in Zooplankton from the Northern Gulf of California During Summer

Rentería-Cano¹,

Sánchez‐Velásco²,

Shumilin³

et al. 2010

Biol Trace Elem Res

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We report the distribution of major and trace element concentrations in epipelagic zooplankton collected in the Northern Gulf of California in August 2003. The Bray-Curtis index defined three element assemblages in zooplankton: (1) major metals, which included only two elements, Na (3.6-17.0%) and Ca (1.0-4.8%). Na had its highest concentrations in the shallow tidally mixed Upper Gulf, where high salinity, temperature, and zooplankton biomass (dominated by copepods) prevailed. Ca showed its highest concentrations south of Ballenas Channel, characterized by tidal mixing and convergence-induced upwelling, indicated by low sea-surface temperature, salinity, and zooplankton biomass; (2) Six biological essential elements, like Fe (80-9,100 mg kg(-1)) and Zn (20-2,570 mg kg(-1)), were detected in high concentrations in zooplankton collected near Guaymas Basin, which had high surface temperature and chlorophyll a concentrations. (3) Metals of terrigenous origin, such as Sc (0.01-1.4 mg kg(-1)) and Th (0.03-2.3 mg kg(-1)), and redox-sensitive metals, like Co (3-23.8 mg kg(-1)); this was the assemblage with the largest number of elements (15). Both types of elements of assemblage 3 had maximum concentrations in the cyclonic eddy that dominates the summer circulation in the Northern region. We concluded that sediment resuspension by tidal mixing in the Upper Gulf, upwelling south of Ballenas Channel, and the cyclonic eddy were key oceanographic features that affected the element concentrations of epipelagic zooplankton in the Northern Gulf of California. Oceanographic mechanisms such as these may contribute to element incorporation in marine organisms in other seas.

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Section: Terrigenous and Redox-sensitive Elements Assemblagementioning

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Major and Trace Elements in Zooplankton from the Northern Gulf of California During Summer

Rentería-Cano¹,

Sánchez‐Velásco²,

Shumilin³

et al. 2010

Biol Trace Elem Res

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“…Extreme precipitation during passage of tropical systems can also result in runoff/extreme flooding [ Galewsky et al , ; Silverberg et al , ]; however, instrumental observations from Bora Bora (Figures a and b) show that storms also commonly produce little change in rainfall near our site. For example, precipitation for November 1997 C.E.…”

Section: Proxy Developmentmentioning

confidence: 98%

South Pacific hydrologic and cyclone variability during the last 3000 years

2016

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Major excursions in the position of the South Pacific Convergence Zone (SPCZ) and/or changes in its intensity are thought to drive tropical cyclone (TC) and precipitation variability across much of the central South Pacific. A lack of conventional sites typically used for multimillennial proxy reconstructions has limited efforts to extend observational rainfall/TC data sets and our ability to fully assess the risks posed to central Pacific islands by future changes in fresh water availability or the frequency of storm landfalls. Here we use the sedimentary record of Apu Bay, offshore the island of Tahaa, French Polynesia, to explore the relationship between SPCZ position/intensity and tropical cyclone overwash, resolved at decadal time scales, since 3200 years B.P. Changes in orbital precession and Pacific sea surface temperatures best explain evidence for a coordinated pattern of rainfall variability at Tahaa and across the Pacific over the late Holocene. Our companion record of tropical cyclone activity from Tahaa suggests major storm activity was higher between 2600-1500 years B.P., when decadal scale SPCZ variability may also have been stronger. A transition to lower storm frequency and a shift or expansion of the SPCZ toward French Polynesia around 1000 years B.P. may have prompted Polynesian migration into the central Pacific.

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“…Around the La Paz Bay, the annual rainfall is relatively low (100 mm y -1 ) (Farfán and Cortez, 2005). After the passage of tropical cyclones (typically between July and November), episodic water discharge through dry streams (arroyos) supply solid and dissolved materials to the coastal marine environment (Silverberg et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of contribution sources for the sediments of the La Paz Lagoon, based on statistical treatment of the mineralogy of their heavy fraction and surrounding rock and drainage basin characteristics

Choumiline¹,

Orta²,

Николаева³

et al. 2009

BSGM

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To identify the main sources of terrigenous sediments of the La Paz Lagoon, a description of the hydrology of the drainage basins and the mineralogy of the heavy fraction of the lagoon sediments is needed. In this work, 14 terrigenous sediment samples from the arroyos (dry streams) and 55 superficial marine sediment samples were collected from the study area. The drainage basins of the principal arroyos discharging into the lagoon were defined using geomorphologic analyses on Geographic Information Systems (GIS). The sediment samples' grain size fraction of 3.25 -3.00 phi was obtained by sieving. The heavy minerals were separated using bromoform and the mineralogical composition was determined using a petrographic polarization microscope. Three main sedimentary provinces in the lagoon were distinguished based on principal component analysis of the heavy mineral data and the study of the surrounding regional streams. The eastern sedimentary province is characterized by the predominance of orthopyroxene, especially hypersthene, as well as a high hornblende presence. This is due to the erosion of volcanoclastic sequences of the Comondú Formation and intrusive granitic complexes of Sierra de Las Cruces. The southeastern province displays a high abundance of hornblendes (up to 81% in some stations), micas, apatite, sphene, anatase, tourmaline, chlorite, clinopyroxene and orthopyroxene. Lower contents of amphibole (up to 27.2% in some stations) and resistant garnet and zircon minerals were found, as were some soft-pink piedmontite and pale-green hypersthene. These minerals were supplied by the El Cajoncito, Los Bledales, La Palma, Cardonal and El Novillo arroyos eroding the intrusive rocks of "Granito Sierra de Las Cruces", "Tonalita La Buena Mujer" and in a smaller extent the extrusive and non-marine rocks (tuffs, riodacites, conglomerates and sandstones) of the Comondú Formation. The predominant minerals of the northwestern province are clinopyroxene, orthopyroxene and phosphatic ooids. Relatively high abundance of olivine, hornblende, zircon, epidote and garnet were also found. These minerals are presumably supplied by the arroyos La Ardilla and other streams to the north of the El Centenario and El Comitán villages, as well as by eolian and littoral transport of the El Mogote sandbar dunes, which accumulates eroded sediments from the marine sedimentary rocks of El Cien Formation.Keywords: sediments, heavy minerals, drainage basins, La Paz Lagoon, principal component analysis, contribution sources. ResumenPara identificar las principales fuentes de aporte de sedimentos terrígenos hacia la Laguna de La Paz la descripción de la hidrología de las cuencas de drenaje con la mineralogía de la fracción pesada de los sedimentos de la laguna es necesaria. En este

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The impact of hurricanes on sedimenting particulate matter in the semi-arid Bahía de La Paz, Gulf of California

Cited by 18 publications

References 38 publications

Major and Trace Elements in Zooplankton from the Northern Gulf of California During Summer

Major and Trace Elements in Zooplankton from the Northern Gulf of California During Summer

South Pacific hydrologic and cyclone variability during the last 3000 years

Evaluation of contribution sources for the sediments of the La Paz Lagoon, based on statistical treatment of the mineralogy of their heavy fraction and surrounding rock and drainage basin characteristics

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