Turbulent flux and meteorological measurements during ARCTEX-2006 campaign

This dataset present result from the DFG- funded Arctic-Turbulence-Experiment (ARCTEX-2006) performed by the University of Bayreuth on the island of Svalbard, Norway, during the winter/spring transition 2006. From May 5 to May 19, 2006 turbulent flux and meteorological measurements were performed on the monitoring field near Ny-Ålesund, at 78°55'24'' N, 11°55'15'' E Kongsfjord, Svalbard (Spitsbergen), Norway. The ARCTEX-2006 campaign site was located about 200 m southeast of the settlement on flat snow covered tundra, 11 m to 14 m above sea level. The permanent sites used for this study consisted of the 10 m meteorological tower of the Alfred Wegener Institute for Polar- and Marine Research (AWI), the international standardized radiation measurement site of the Baseline Surface Radiation Network (BSRN), the radiosonde launch site and the AWI tethered balloon launch sites. The temporary sites - set up by the University of Bayreuth - were a 6 m meteorological gradient tower, an eddy-flux measurement complex (EF), and a laser-scintillometer section (SLS). A quality assessment and data correction was applied to detect and eliminate specific measurement errors common at a high arctic landscape. In addition, the quality checked sensible heat flux measurements are compared with bulk aerodynamic formulas that are widely used in atmosphere-ocean/land-ice models for polar regions as described in Ebert and Curry (1993, doi:10.1029/93JC00656) and Launiainen and Cheng (1995). These parameterization approaches easily allow estimation of the turbulent surface fluxes from routine meteorological measurements. The data show: - the role of the intermittency of the turbulent atmospheric fluctuation of momentum and scalars, - the existence of a disturbed vertical temperature profile (sharp inversion layer) close to the surface, - the relevance of possible free convection events for the snow or ice melt in the Arctic spring at Svalbard, and - the relevance of meso-scale atmospheric circulation pattern and air-mass advection for the near-surface turbulent heat exchange in the Arctic spring at Svalbard. Recommendations and improvements regarding the interpretation of eddy-flux and laser-scintillometer data as well as the arrangement of the instrumentation under polar distinct exchange conditions and (extreme) weather situations could be derived.

Logarithmetical Arithmetick, ca. 1765

This small paper-bound notebook contains James Winthrop's notes from his study of logarithms. It was presumably created between 1765 and 1769, while he was a Harvard undergraduate. The notebook contains prose explanations of logarithms, as well as problem sets, case studies, and examples.

Logarithmic and trigonometric tables.

"Copyright, 1913 and 1920 ... Revised edition published August 1920. Reprinted April, 1924 ... June, 1935."

Logarithmic and trigonometric tables.

Mode of access: Internet.

Tables de logarithmes vulgaires à dix decimales.

"Approuvées par l'Académie impériale des sciences de S.-Pétersbourg."

High school mathematics /

Each unit comprises Student's ed. and Teachers' ed., interleaved.

Logarithmically periodic resonant-v arrays /

"Contract AF33(616)-6079 Project No. 9-(13-6278) Task 40572. Sponsored by: Wright Air Development Center"

Funfstellige vollstandigellogarithmische und trigonometrische tafeln ... 101 bis 105 aulf.

Mode of access: Internet.

Siebensteelige gemeine Logarithmen der Zahlen 1 bis 108000 und der Sinus, Cosinus, Tangenten und Cotangenten aller Winkel des Quadranten von 10 zu 10 Secunden.

Mode of access: Internet.

Easy mathematics, chiefly arithmetic : being a collection of hints to teachers, parents, self-taught students, and adults, and containing a summary or indication of most things in elementary mathematics useful to be known /

Folded table of 3-figure logarithms at end.

Third-year mathematics for secondary schools, with Logarithmic and trigonometric tables and mathematical formlas,

Biography on verso of each portrait.

Logaritmetavel,

Mode of access: Internet.

Die Logarithmen der Sinus und Tangenten für 0⁰ bis 5⁰ und der Cosinus und Contangenten für 85⁰ bis 90⁰ von tausendstel zu tausendstel grad. : als ergänzung zu C. Bremiker's 5stelligen Logarithmentafeln /

Mode of access: Internet.

Logarithmic tables of numbers and trigonometrical functions /

Mode of access: Internet.

Tables de logarithmes à huit décimales des nombres entiers de 1 à 120 000 et des sinus et tangentes de dix secondes en dix secondes d'arc dans le système de la division centésimale du quadrant.

At head of title: Service géographique de l'Armée.