Comment on “Low time resolution analysis of polar ice cores cannot detect impulsive nitrate events” by D.F. Smart et al.

Smart et al. (2014) suggested that the detection of nitrate spikes in polar ice cores from solar energetic particle (SEP) events could be achieved if an analytical system with sufficiently high resolution was used. Here we show that the spikes they associate with SEP events are not reliably recorded in cores from the same location, even when the resolution is clearly adequate. We explain the processes that limit the effective resolution of ice cores. Liquid conductivity data suggest that the observed spikes are associated with sodium or another nonacidic cation, making it likely that they result from deposition of sea salt or similar aerosol that has scavenged nitrate, rather than from a primary input of nitrate in the troposphere. We consider that there is no evidence at present to support the identification of any spikes in nitrate as representing SEP events. Although such events undoubtedly create nitrate in the atmosphere, we see no plausible route to using nitrate spikes to document the statistics of such events.

Pedro Piñero Ramírez et al. (eds.), Romancero de la Provincia de Sevilla, Sevilla: Universidad - Diputación, 2013, 935 pp.

Fil: Chicote, Gloria. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales (UNLP-CONICET); Argentina.

Benthic anammox and dentrification rates measured in a slurry incubation experiments at four different stations in the Arabian Sea off Pakistan during the METEOR cruise M74/2 in 2007

Vertical distributions of benthic denitrification and anammox rates within the sediment were estimated from slurry incubation experiments. Rates were used to calculate the contribution of anammox and denitrification to the total N-loss. Briefly, MUC sediment cores were sliced in 2 cm intervals and the sediment was diluted and incubated with degassed bottom water in a gas tight bag. After pre-incubating the bags for 2 h, 15N-labeled substrates were injected into the bags and the slurries were thoroughly mixed. Incubations were performed in the dark at in situ temperatures. The N2 isotope ratio (28N2, 29N2, and 30N2) was determined by gas chromatography-isotopic ratio mass spectrometry (VG Optima, Micromass) and calculated according to Kuypers et al. (2005) and Holtappels et al. (2011), respectively.Furthermore, total organic carbon and nitrogen concentrations were measured of core sediment layers corresponding to those used for rate measurements. Concentrations of organic carbon and nitrogen were determined by combustion/gas chromatography (Carlo Erba NA-1500 CNS analyzer) of dried sediment samples after acidification. The same sediment layer were also used to extract nucleic acids. The concentrations of the DNA in the samples were measured spectrophotometrically with a NanoDrop instrument (Thermo Fisher Scientific Inc.). The biomarker functional gene nirS, encoding the cd1-containing nitrite reductase, for both denitrifiers and marine anammox bacteria were quantified with real-time PCR, using the primers cd3aF/R3cd (5'-GTSAACGTSAAGGARACSGG-3' (Michotey et al., 2000)/5'-GASTTCGGRTGSGTCTTGA-3'; Throback et al., 2004) and Scnir372F/Scnir845R (5'-TGTAGCCAGCATTGTAGCGT-3'/5'-TCAAGCCAGACCCATTTGCT-3'; Lam et al., 2009).

Environmental controls on the Emiliania huxleyi calcite mass

Although ocean acidification is expected to impact (bio)calcification by decreasing the seawater carbonate ion concentration, [CO3]2-, there exists evidence of non-uniform response of marine calcifying plankton to low seawater [CO3]2-. This raises questions on the role of environmental factors other than acidification and on the complex physiological responses behind calcification. Here we investigate the synergistic effect of multiple environmental parameters, including temperature, nutrient (nitrate and phosphate) availability, and seawater carbonate chemistry on the coccolith calcite mass of the cosmopolitan coccolithophore Emiliania huxleyi, the most abundant species in the world ocean. We use a suite of surface (late Holocene) sediment samples from the South Atlantic and southwestern Indian Ocean taken from depths lying well above the modern lysocline. The coccolith calcite mass in our results presents a latitudinal distribution pattern that mimics the main oceanographic features, thereby pointing to the potential importance of phosphorus and temperature in determining coccolith mass by affecting primary calcification and possibly driving the E. huxleyi morphotype distribution. This evidence does not necessarily argue against the potentially important role of the rapidly changing seawater carbonate chemistry in the future, when unabated fossil fuel burning will likely perturb ocean chemistry beyond a critical point. Rather our study highlights the importance of evaluating the combined effect of several environmental stressors on calcifying organisms to project their physiological response(s) in a high CO2 world and improve interpretation of paleorecords.

In the Supreme Court of the United States, October term, 1980, Héctor García, petitioner v. Alton V.M. Gloor ... [et al.], respondents : on writ of certiorari to the United States Court of Appeals for the Fifth Circuit : petition for writ of certiorari /

At head of title: no.

Alegato presentado a la Sala 1a. de la Corte de Apelaciones como abogado de los señores Rösing Brothers & Co. [et al]

At head of title: La cuestión "R. Samper y Cía".

Reducing wastewater from cucumber pickling process by controlled culture fermentation / by Linda W. Little ... [et al.].

Mode of access: Internet.

National security assessment of the U.S. shipbuilding and repair industry / prepared by Stephen Baker ... [et al.].

"May 2001."

Images galantes et esprit de l'étranger : Berlin, Munich, Vienne, Turin, Londres : 242 illustrations des journaux Wiener Caricaturen ... [et al.] /

Mode of access: Internet.

Weston F. Milliken et al., vs. the Portland & Ogdensburg R.R. Co. et als. /

Brief in hearing on petition before Judge Walton for issue of $50,000 additional certificates of receiver.

Weston F. Milliken et al. vs. the Portland and Ogdensburg Railroad Co. et als.

At head of title: State of Maine. Cumberland, ss. Supreme Judicial Court.

Before the Interstate Commerce Commission : no. 879 : City of Spokane, Wash., et al., v. Northern Pacific Railway Company et al., decided February 9, 1909.

"Report and order of the Commission."

United States of America, petitioner, v. Standard Oil Company of New Jersey et al., defendants.

At head of title: In the Circuit Court of the United States for the Eastern Division of the Eastern Judicial District of Missouri.

The rise of professional proxy solicitors: Georgeson & Co. of Wall Street, et al.

Includes bibliography.

Curso completo de geografía universal antigua y moderna : obra basada sobre Letronne ... [et al.] : enriquecida con todos los conocimientos y descubrimientos modernos /

Mode of access: Internet.