Larsen, N.
Works: | 52 works in 91 publications in 3 languages and 143 library holdings |
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Roles: | Author, Contributor |
Classifications: | QC770, |
9 editions published between 1909 and 1932 in Danish and Undetermined and held by 15 WorldCat member libraries worldwide
5 editions published between 1914 and 1926 in Danish and held by 10 WorldCat member libraries worldwide
4 editions published between 1871 and 2015 in Danish and held by 6 WorldCat member libraries worldwide
2 editions published in 1988 in English and held by 6 WorldCat member libraries worldwide
1 edition published in 2006 in English and held by 6 WorldCat member libraries worldwide
A 16S rRNA gene database (http://greengenes.lbl.gov) addresses limitations of public repositories by providing chimera-screening, standard alignments and taxonomic classification using multiple published taxonomies. It was revealed that incongruent taxonomic nomenclature exists among curators even at the phylum-level. Putative chimeras were identified in 3% of environmental sequences and 0.2% of records derived from isolates. Environmental sequences were classified into 100 phylum-level lineages within the Archaea and Bacteria
2 editions published in 1987 in English and held by 5 WorldCat member libraries worldwide
5 editions published between 1902 and 1932 in French and held by 5 WorldCat member libraries worldwide
2 editions published between 1915 and 2018 in Danish and held by 4 WorldCat member libraries worldwide
2 editions published between 1863 and 2015 in Danish and held by 4 WorldCat member libraries worldwide
3 editions published in 1991 in English and held by 4 WorldCat member libraries worldwide
2 editions published in 1904 in Danish and held by 4 WorldCat member libraries worldwide
2 editions published between 1863 and 2013 in Danish and held by 4 WorldCat member libraries worldwide
2 editions published in 2005 in English and held by 3 WorldCat member libraries worldwide
A scheme for introducing mountain wave-induced temperature perturbations in a microphysical polar stratospheric cloud (PSC) model has been developed. A data set of temperature fluctuations attributable to mountain waves as computed by the Mountain Wave Forecast Model (MWFM-2) has been used for the study. The PSC model has variable microphysics, enabling different nucleation mechanisms for nitric acid trihydrate, NAT, to be employed. In particular, the difference between the formation of NAT and ice particles in a scenario where NAT formation is not dependent on preexisting ice particles, allowing NAT to form at temperatures above the ice frost point, T(sub ice), and a scenario where NAT nucleation is dependent on preexisting ice particles, is examined. The performance of the microphysical model in the different microphysical scenarios and a number of temperature scenarios with and without the influence of mountain waves is tested through comparisons with lidar measurements of PSCs made from the NASA DC-8 on 23 and 25 January during the SOLVE/THESEO 2000 campaign in the 1999-2000 winter and the effect of mountain waves on local PSC production is evaluated in the different microphysical scenarios. Mountain waves are seen to have a pronounced effect on the amount of ice particles formed in the simulations. Quantitative comparisons of the amount of solids seen in the observations and the amount of solids produced in the simulations show the best correspondence when NAT formation is allowed to take place at temperatures above T(sub ice). Mountain wave-induced temperature fluctuations are introduced in vortex-covering model runs, extending the full 1999-2000 winter season, and the effect of mountain waves on large-scale PSC production is estimated in the different microphysical scenarios. Regardless of the choice of microphysics, the inclusion of mountain waves increases the amount of NAT particles by as much as 10%
3 editions published in 1838 in Danish and held by 3 WorldCat member libraries worldwide
3 editions published in 1986 in English and held by 3 WorldCat member libraries worldwide
2 editions published in 2006 in English and held by 3 WorldCat member libraries worldwide
Space borne infrared limb emission measurements by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) reveal the formation of a belt of polar stratospheric clouds (PSCs) of nitric acid trihydrate (NAT) particles over Antarctica in mid-June 2003. By mesoscale microphysical simulations we show that this sudden onset of NAT PSCs was caused by heterogeneous nucleation on ice in the cooling phases of large-amplitude stratospheric mountain waves over the Antarctic Peninsula and the Ellsworth Mountains. MIPAS observations of PSCs before this event show no indication of the presence of NAT clouds with volume densities larger than about 0.3 micrometer(exp 3)/cm(exp 3) and radii smaller than 3 micrometers, but are consistent with supercooled droplets of ternary H2SO4/HNO3/H2O solution (STS). Simulations indicate that homogeneous surface nucleation rates have to be reduced by three orders of magnitude to comply with the observations
1 edition published in 2009 in English and held by 2 WorldCat member libraries worldwide
in Danish and held by 2 WorldCat member libraries worldwide
1 edition published in 1875 in Danish and held by 2 WorldCat member libraries worldwide


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