A research team consisting of Assistant Professor Okajima and Professor Takashi Nakamura of the Center for Advanced Science and Technology, the University of Tokyo, and Associate Professor Kaspi of the Weitzman Institute of Israel, separates individual low and high pressures from background winds such as westerlies and is wider. We have developed a new analysis method that can quantitatively investigate the effects on the range of meteorology and climate.
A low pressure system is a movement of wind that rotates around a region where a certain atmospheric pressure is relatively low, and an anticyclone is a meteorological phenomenon that rotates around a region where the atmospheric pressure is high.Cyclones tend to be accompanied by rainy and stormy weather, and highs tend to be accompanied by mild and sunny weather, but they are not only regional weather conditions, but also a broader and larger scale meteorological phenomenon, global. It is also thought to affect the behavior and characteristics of the climate system and atmospheric circulation.
However, in the conventional three-dimensional atmospheric data analysis method (oiler-like method), low pressure and high pressure are only observed as deviations (deviations) from the background average state, and they exist independently. It was not possible to quantitatively evaluate the effect after separating it as.
On the other hand, the method developed this time separates the winds around individual cyclones and anticyclones from the background winds such as westerlies, which are high-speed streams existing between the latitudes of 30 degrees and 60 degrees in both hemispheres. We have succeeded in evaluating the effect of the local curvature (shape) of individual cyclones and anticyclones on the westerly jet stream.Such detailed information cannot be obtained from the conventional standard of view based on relative vorticity.
This method can be applied to simulation data of various numerical climate models, and is expected to be useful for atmospheric circulation and future climate prediction.
Paper information:[Scientific Reports] Cyclonic and anticyclonic contributions to atmospheric energetics
