In recent years, global warming caused by emission of CO 2 has attracted considerable attention from the public. Although the measurements from AIRS, GOSAT, SCIAMACHY and IASI have been frequently used to derive atmospheric CO 2 concentration, comprehensive quantification of the differences among these CO 2 products is still not fully investigated yet. In this paper, a series of strategies have been proposed to allow the CO 2 products from different instruments to be physically inter-comparable. Based on this, these CO 2 products are inter-compared in terms of magnitude and their spatiotemporal distributions. The results reveal that the correlations among these CO 2 products are relatively weak, and some discrepancies are detected in terms of the CO 2 spatiotemporal characteristics, demonstrating more efforts should be made in the future to improve the retrievals of CO 2 . Their spatial coverage differences reflected in this study imply the great necessity to generate consistent products with improved spatial and temporal continuities by combining these CO 2 measurements.
With the Monte Carlo method, we investigate the magnetic properties of four nanomagnets of different shapes, i.e., the circular-shaped, the square-shaped, the elliptical, and the ringshaped nanomagnets. A systematic study of the effects of the dipolar interaction on the magnetic configurations is performed in these nanomagnets, and further the coercive field and the remanence as a function of dipolar interaction are analyzed. The results show that the magnetic configuration and thus the magnetization reversal process of nanomagnets are dependent strongly on the strength of dipolar interactions. For the case of small dipolar interaction, the magnetization reversal process is mainly dominated by spin rotation, while the reversal transforms to the vortex nucleation and propagation formations with increasing dipolar interaction. Moreover, if the dipolar interaction is neglected in the calculation of the total energy, no clear difference is found among hysteresis loops of four nanomagnets with same areas, but the inclusion of dipolar interaction can lead to different hysteresis loops for nanomagnets with same areas but different shapes. This indicates that the dipolar interaction is important for accounting for the shape effect of the magnetic properties in nanomagnets.
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