Lars Eriks Kalnajs

The Concordiasi Project in Antarctica

The Concordiasi project is making innovative observations of the atmosphere above Antarctica. The most important goals of the Concordiasi are as follows: To enhance the accuracy of weather prediction and climate records in Antarctica through the assimilation of in situ and satellite data, with an emphasis on data provided by hyperspectral infrared sounders. The focus is on clouds, precipitation, and the mass budget of the ice sheets. The improvements in dynamical model analyses and forecasts will be used in chemical-transport models that describe the links between the polar vortex dynamics and ozone depletion, and to advance the under understanding of the Earth system by examining the interactions between Antarctica and lower latitudes. To improve our understanding of microphysical and dynamical processes controlling the polar ozone, by providing the first quasi-Lagrangian observations of stratospheric ozone and particles, in addition to an improved characterization of the 3D polar vortex dynamics. Techni...

The Concordiasi Field Experiment over Antarctica: First results from innovative atmospheric measurements

Florence Rabier , Steve Cohn , Philippe Cocquerez , Albert Hertzog, Linnea Avallone, Terry Deshler, Jennifer Haase , Terry Hock, Alexis Doerenbecher , Junhong Wang , Vincent Guidard, Jean-Noël Thépaut , Rolf Langland, Andrew Tangborn , Gianpaolo Balsamo , Eric Brun, David Parsons , Jérôme Bordereau , Carla Cardinali , François Danis , Jean-Pierre Escarnot , Nadia Fourrié, Ron Gelaro, Christophe Genthon , Kayo Ide, Lars Kalnajs, Charlie Martin, LouisFrançois Meunier , Jean-Marc Nicot , Tuuli Perttula, Nicholas Potts , Patrick Ragazzo , David Richardson, Sergio Sosa-Sesma , André Vargas 3

A Novel Lightweight Low-Power Dual-Beam Ozone Photometer Utilizing Solid-State Optoelectronics

Abstract Recent advances in semiconductor materials and fabrication techniques have allowed the development of light-emitting diodes (LEDs) with wavelengths extending down into the UV-C region (λ < 280 nm). A new ozone photometer has been developed utilizing these novel light sources. The application of solid-state technology to the proven dual-beam UV absorption technique has improved instrument performance while reducing power consumption and weight compared to existing instrumentation. The newly developed instrument is expected to have an accuracy of 1% at surface level pressure, a resolution better than 1 ppb, and measurement rates up to 1 Hz over the range of ozone mixing ratios encountered from the earth’s surface to the middle stratosphere. Size, weight, and power consumption have also been significantly reduced, with a mass of 3 kg and a power consumption of less than 5 W. Initial development is focused on an instrument suitable for measurements from autonomous platforms and in harsh environments;...