Polar Vortex

TR:
Kutuplar pek çok farklı fiziksel sürecin incelenebildiği, gezegenimizin doğal ve küresel süreçleri hakkında bilgi sahibi olacağımız önemli bölgelerindendir. Bu sebeple bu bölgelerde araştırmalarını yürüten bilim insanlarının bilgilerini eğitimcilerle paylaşmasının ve eğitimcilerin de öğrencilerine aktarmasının bilginin hızlı yayılmasına ve kutup bölgelerine olan ilginin artmasına yardımcı olacağı düşünülmektedir. Bu araştırmanın amacı özel yetenekli öğrencilerin bazı kutup fenomenlerine ilişkin görüşlerini belirlemek ve bilgi edinme sürecinde yararlandıkları bilgi kaynaklarının kökenini araştırmaktır.
EN:
The polar regions have a crucial role in which many different physical processes can be studied and where we can learn about the natural and global processes of our planet. For this reason, it is thought that sharing the knowledge of scientists conducting their research in these regions with educators and transferring them to their students will help the rapid spread of knowledge and increase the interest in polar regions. The aim of this research is to determine the views of gifted students on some polar phenomena and to investigate the origin of the sources of information they use in the process of obtaining information.

Polar vortex vacillations are investigated using long-term simulations of potential-vorticity (PV)-based shallow-water (SW) models for the stratosphere. In the models examined, mechanical forcing is applied through a time-independent topography mimicking tropospheric excitation of the stratosphere. Thermal forcing is applied through a linear relaxation of the mass field to a time-independent equilibrium state mimicking the radiative relaxation taking place in the stratosphere. The SW equations in the PV, velocity divergence, and acceleration divergence representation are solved for a range of resolutions using the “diabatic contour-advective semi-Lagrangian” (DCASL) algorithm and a standard pure semi-Lagrangian (SL) algorithm. Using very different numerical algorithms enables the determination of the degree of numerical sensitivity and the properties of the vacillations with much greater accuracy than in previous related studies. The focus here is on the Lagrangian or material evolu...

The tracer-tracer correlation technique (TRAC) has been widely employed to infer chemical ozone loss from observations. Yet, its applicability to chemistry-climate model(CCM) data is disputed. Here, we report the successful application of TRAC on theresults of a CCM simulation. By comparing TRAC-calculated ozone loss to ozone lossderived with the passive ozone method in a chemistry transport model we differentiateeffects of internal mixing and cross vortex boundary mixing on a TRAC referencecorrelation. As a test case, we consider results of a cold Arctic winter/spring episode froman E39/C experiment, where typical features, for example, sufficient polar stratosphericcloud formation potential, denitrification and dehydration, and intermittent and finalstratospheric warming events, are simulated. We find that internal mixing does not impact the TRAC-derived reference correlation at all. Mixing across the vortex boundary wouldlead to an underestimation of ozone loss by 10% when calculated with TRAC. We provide arguments that TRAC is a consistent and conservative method to derive chemicalozone loss and can be used to extract its chemical signature also from CCM simulations. As a consequence, we will be able to provide a lower bound for chemical ozone loss for model simulations where a passive ozone tracer is not available

Received 19 March 2001; revised 3 August 2001; accepted 24 August 2001; published 27 September 2002. [1] Transport of methane associated with the polar vortex and its breakdown was observed by the data from the Improved Limb Atmospheric Spectrometer (ILAS) during November ...

Several meteorological datasets, including U.K. Met Office (MetO), European Centre for Medium-Range Weather Forecasts (ECMWF), National Centers for Environmental Prediction (NCEP), and NASA’s Goddard Earth Observation System (GEOS-4) analyses, are being used in studies of the 2002 Southern Hemisphere (SH) stratospheric winter and Antarctic major warming. Diagnostics are compared to assess how these studies may be affected by the meteorological data used. While the overall structure and evolution of temperatures, winds, and wave diagnostics in the different analyses provide a consistent picture of the large-scale dynamics of the SH 2002 winter, several significant differences may affect detailed studies. The NCEP–NCAR reanalysis (REAN) and NCEP–Department of Energy (DOE) reanalysis-2 (REAN-2) datasets are not recommended for detailed studies, especially those related to polar processing, because of lower-stratospheric temperature biases that result in underestimates of polar processi...

We investigate the extent to which quantities that are based on total column ozone are applicable as measures of ozone loss in the polar vortices. Such quantities have been used frequently in ozone assessments by the World Meteorological Organization (WMO) and ...