175,273 research outputs found
Pioneer personal history answers, Catherine C. Larsen
No full textTypescript of answers by Catherine C. Larsen for a questionnaire filled out for Utah Works Progress Administration\u27s "Pioneer personal history" survey. She was born in Illinois in 1856, and her family came to Utah in 1857, settling at Mount Pleasant, Sanpete County. Typed by Sterling Haws of Manti in 193
Present stability of the Larsen C ice shelf, Antarctic Peninsula
No full textWe modelled the flow of the Larsen C and northernmost Larsen D ice shelves, Antarctic
Peninsula, using a model of continuum mechanics of ice flow, and applied a fracture criterion to the
simulated velocities to investigate the ice shelf’s present-day stability. Constraints come from satellite
data and geophysical measurements from the 2008/09 austral summer. Ice-shelf thickness was derived
from BEDMAP and ICESat data, and the density–depth relationship was inferred from our in situ seismic
reflection data. We obtained excellent agreements between modelled and measured ice-flow velocities,
and inferred and observed distributions of rifts and crevasses. Residual discrepancies between regions of
predicted fracture and observed crevasses are concentrated in zones where we assume a significant
amount of marine ice and therefore altered mechanical properties in the ice column. This emphasizes
the importance of these zones and shows that more data are needed to understand their influence on
ice-shelf stability. Modelled flow velocities and the corresponding stress distribution indicate that the
Larsen C ice shelf is stable at the moment. However, weakening of the elongated marine ice zones could
lead to acceleration of the ice shelf due to decoupling from the slower parts in the northern inlets and
south of Kenyon Peninsula, leading to a velocity distribution similar to that in the Larsen B ice shelf prior
to its disintegration
a low-activity cold seep in the Larsen B area, western Weddell Sea, Antarctica
No full textFirst videographic indication of an Antarctic cold seep ecosystem was recently obtained from the collapsed Larsen B ice shelf, western Weddell Sea (Domack et al., 2005). Within the framework of the R/V Polarstern expedition ANTXXIII-8, we revisited this area for geochemical, microbiological and further videographical examinations. During two dives with ROV Cherokee (MARUM, Bremen), several bivalve shell agglomerations of the seep-associated, chemosynthetic clam <I>Calyptogena</I> sp. were found in the trough of the Crane and Evans glacier. The absence of living clam specimens indicates that the flux of sulphide and hence the seepage activity is diminished at present. This impression was further substantiated by our geochemical observations. Concentrations of thermogenic methane were moderately elevated with 2 μM in surface sediments of a clam patch, increasing up to 9 μM at a sediment depth of about 1 m in the bottom sections of the sediment cores. This correlated with a moderate decrease in sulphate from about 28 mM at the surface down to 23.4 mM, an increase in sulphide to up to 1.43 mM and elevated rates of the anaerobic oxidation of methane (AOM) of up to 600 pmol cm<sup>&minus;3</sup> d<sup>&minus;1</sup> at about 1 m below the seafloor. Molecular analyses indicate that methanotrophic archaea related to ANME-3 are the most likely candidates mediating AOM in sediments of the Larsen B seep
What Next in a Post-C-51 Canada?
No full textBill C-51anti-terrorismaccess to informationfreedom of informationprivacyCanadian Institute for Information and Privacy StudiesPre-publication text of an address delivered at the 2015 Annual General Meeting of the Canadian Institute for Information and Privacy Studies. The author reflects on the implications of the passage of the C-51 omnibus anti-terrorism bill, with reference to information and privacy issues. The address is framed as a proposal for a research agenda based on four questions: (1) How are police and security personnel being briefed and trained regarding their post-C-51 mandates?; (2) What policies, procedures, and interpretations will govern the securitization and sharing of information within and between federal government institutions?; (3) How will the C-51 changes impact intergovernmental collaboration and information sharing, especially with respect to personal information?; (4) How will the C-51 changes impact information and privacy rights under the Access to Information Act (ATIA) and Privacy Act?.Larsen, M. (2015). What Next in a Post-C-51 Canada? (CIIPS Research Report). Vancouver, B.C.: Canadian Institute for Information and Privacy Studies. Retrieved from https://infoandprivacy.ca/wp-content/uploads/2015/07/Larsen-Research-Post-C-51-Canada.pdfplease include a link to the published work: https://infoandprivacy.ca/wp-content/uploads/2015/07/Larsen-Research-Post-C-51-Canada.pd
Ice-Front Retreat Controls on Ocean Dynamics Under Larsen C Ice Shelf, Antarctica
No full textIceberg A-68 separated from the Larsen C Ice Shelf in July 2017 and the impact of this event on the local ocean circulation has yet to be assessed. Here, we conduct numerical simulations of ocean dynamics near and below the ice shelf pre- and post-calving. Results agree with in situ and remote observations of the area as they indicate that basal melt is primarily controlled by wintertime sea-ice formation, which in turn produces High Salinity Shelf Water (HSSW). After the calving event, we simulate a 50% increase in HSSW intrusion under the ice shelf, enhancing ocean heat delivery by 30%. This results in doubling of the melt rate under Gipps Ice Rise, suggesting a positive feedback for further retreat that could destabilize the Larsen C Ice Shelf. Assessing the impact of ice-front retreat on the heat delivery under the ice is crucial to better understand ice-shelf dynamics in a warming environment.Physical and Space GeodesyGeoscience and Remote Sensin
Doris G. Larsen Papers
No full textIncludes a number of writings about the Furnberg and Korum families, ancestral families of Ms. Larsen. Norwegian Roots, A Korum Branch, primarily is the reminiscences (6 leaves) by Johanne (Korum) Furnberg of her youth, growing up at Brandon, Minnesota and also working at Fargo, N.D. The Furnberg items document Anne Furnberg who with her husband Christian Scotsberg immigrated from Norway to America, and settled near Northfield, Minnesota. After Christian's death in 1869, Anna and son settled on land in present-day West Fargo, along the Sheyenne River. Her son Christian later married Johanne Korum and lived at Osgood, N.D., south of West Fargo, where he operated a general store. There is also a 10 leaf reminiscence by Christian C. Furnberg titled, "High lghts in my life as a boy.
Matthew C. Larsen
No full textMatthew C. Larsen is the Director of the Smithsonian Tropical Research Institute, headquartered in Panama City, Panama. The Institute furthers the understanding of tropical nature and its importance to human welfare, trains students to conduct research in the tropics, and promotes conservation by increasing public awareness of the beauty and importance of tropical ecosystems. In addition to its resident scientists, the Institute’s facilities are used annually by some 1,300 visiting scientists, pre- and postdoctoral fellows and interns from academic and research institutions who come from a quarter of all nations on Earth. From 2010 to 2014, Dr. Larsen was the U.S. Geological Survey Associate Director for Climate and Land Use Change, where he led science programs focused on climate change, land use change, and a national ecological carbon sequestration assessment. Additionally, Dr. Larsen managed the Landsat satellite program and the National Climate Change and Wildlife Science Center. From 2005 to 2014, Dr. Larsen led U.S. Geological Survey Water Resources programs and served as Chair of the US National Committee for UNESCO International Hydrological Programme. Larsen’s 90+ publications are in the fields of natural hazards, water resources, climate change, ecosystem services, and marine geology. Dr. Larsen earned a B.S. in Geology from Antioch College, Yellow Springs, Ohio, and a PhD in Geography at the University of Colorado in Boulder.Matthew C. Larsen es el Director del Instituto Smithsonian de Investigaciones Tropicales, con sede en la Ciudad de Panamá, Panamá. El Instituto promueve la comprensión de la naturaleza tropical y su importancia para el bienestar humano, capacita a los estudiantes para realizar investigaciones en los trópicos y promueve la conservación al aumentar la conciencia pública sobre la belleza y la importancia de los ecosistemas tropicales. Además de sus científicos residentes, las instalaciones del Instituto son utilizadas anualmente por unos 1.300 científicos visitantes, becarios y pasantes pre y postdoctorales de instituciones académicas y de investigación que provienen de una cuarta parte de todas las naciones de la Tierra. De 2010 a 2014, el Dr. Larsen fue Director Asociado del Servicio Geológico de EE. UU. Para el Cambio Climático y del Uso de la Tierra, donde dirigió programas científicos centrados en el cambio climático, el cambio del uso de la tierra y una evaluación de secuestro de carbono ecológico nacional. Además, el Dr. Larsen administró el programa satelital Landsat y el Centro Nacional de Ciencia del Cambio Climático y la Vida Silvestre. De 2005 a 2014, el Dr. Larsen dirigió los programas de Recursos Hídricos del Servicio Geológico de EE. UU. Y se desempeñó como Presidente del Comité Nacional de EE. UU. Para el Programa Hidrológico Internacional de la UNESCO. Las más de 90 publicaciones de Larsen están relacionadas con los peligros naturales, los recursos hídricos, el cambio climático, los servicios de los ecosistemas y la geología marina. El Dr. Larsen obtuvo un B.S. en Geología de Antioch College, Yellow Springs, Ohio, y un doctorado en Geografía en la Universid
152. Pocket account book owned by Mrs. Mary Larsen of Richfield, Utah
No full textPhotograph of and document for a pocket account book owned by Mrs. Mary Larsen of Richfield, Utah. Inscription inside: "Ole Larsen Snedker." Given to owner\u27s husband\u27s father, belonged to his father.. Date on first page: 186
153. Razor owned by Mrs. Mary Larsen of Richfield, Utah
No full textPhotograph of and document for a razor owned by Mrs. Mary Larsen of Richfield, Utah. Belonged to owner\u27s husband\u27s father, who brought it from Norway to Utah in 185
Wood burning as source of Benzo(a)pyrene in PM
No full textWood burning is a relevant source of PM in ambient air in many areas of the world. Recent studies have found that wood burning contributes between 7% and 20 % of PM10 mass in urban and rural sites in Austria (Caseiro et al., 2009). In particular, Bari et al. (2009) estimated that 20 to 60 % of the total PM10 organic loadings in the winter ambient air near Stuttgart (D) derive from wood burning. These authors observed that 93% of PAH in PM10 derive from combustion processes and 43% of them are carcionogenic.
In the Po Valley emission inventories attribute 30% of primary PM10 to wood burning and the like (ARPA Lombardia). Source apportionment using CMB and PMF estimated a contribution of wood burning on annual basis ranging from 10 to 25 % (Colombi et al., 2008, Larsen et al., in prep.). In this area there are many locations where the levels of Benzo(a)pyrene (BaP) are near or above the annual target value set by European Directive 2004/107/EC (ARPA Lombardia).
This study points to estimate the contribution of wood burning (including burning of agricultural residues) to the levels of toxic PAHs in the PM10 by using BaP as marker.
The sources of BaP were estimated by computing multiple linear regression and non linear factorial regression. The model parameters were fitted using two independent datasets of PM10 samples collected between 2005 and 2007 in urban sites located in the Po Valley and in the southern Alps.
The explanatory variables used for estimating BaP were selected using forward selection based on F test from a pool of variables representing: biomass burning (levoglucosan), emissions from unspecified combustion processes (CO, NOx, EC, OC and trace elements) and atmospheric properties (wind speed, temperature, and height of the mixing layer).
In the background sites levoglucosan explained a considerable part of the BaP contribution to the PM10 mass. In a number of urban background sites, levoglucosan was the most important variable to explain BaP levels. Other variables explaining significant part of BaP variance were NOx, CO , OC, wind speed, and air temperature.
In a kerbside site, the influence of levoglucosan on BaP variance decreased but was still relevant.
Good agreement has been observed between these results and those obtained using PMF for source apportionment of BaP.
We conclude that biomass burning is one of the most important sources of toxic PAH in the particulate fraction in both the Po Valley and in Alpine areas where wood is widely use as fuel for heating.
ARPA Lombardia (Environmental Protection Agency of Lombardy) http://ita.arpalombardia.it/ITA/ qaria/Home.asp
Bari A., Baumbach G., Kuch B., Scheffknecht G. (2009). Atmos Env, 43, 4722–4732
Caseiro A., Bauer H., Schmidl C., Pio C.A., Puxbaum H. (2009). Atmos Env, 43, 2186–2195
Colombi C., Mossetti S., Belis C., Gianelle V., Lazzarini M., Angelino E., Peroni E., Della Mora S. (2008). in Proc. 3rd National Conference on Particulate Matter (Bari, Italy) 90
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