Small storms in the Arctic orchestrate the pipeline flows in the world's oceans and control the delivery of heat to the North Pole, which indicates that their inclusion in all global climate models, say scientists in a paper published in the journal Nature Geoscience.
"During the year in the northern half of the Arctic formed hundreds of relatively weak storm, and tens — sufficiently strong vortices. Climate models do not account for them, which leads to incorrect estimates of how much heat is transferred in the direction of the currents of the North Pole. This prevents us from making forecasts on change climate in Europe and North America ", — said one of the authors Kondron Alan (Alan Condron) from the University of Massachusetts in Boston (USA).
Kondron and his colleague Ian Renfryu (Ian Renfrew) from the University of East Anglia in Norvik (UK) studied the images collected climate satellites over the past 20 years. In these pictures they found small eddies in the atmosphere, with a diameter of approximately 250-500 kilometers, reminiscent in structure to the usual hurricanes.
According to the calculations of climate scientists, each year in the polar regions appear and disappear several hundred small vortices, and dozens of major hurricanes. This large number of these anomalies and forced Renfryu Kondrona see how adding them affect the work of the climate model, which describes the work of "conveyor currents" in the Arctic.
As the basis of the researchers took climate model MITgcm, which has a sufficiently high resolution and the necessary tools to account for the effect of hurricanes on the Arctic climate.
Climate scientists have used it to model the flow of work and related climate processes in the period from 1978 to 1998. Renfryu Kondron and comparing the simulation results for each year, with the output of the "regular" version of MITgcm.
According to the researchers, the addition of Arctic hurricanes significantly change the results of modeling. In particular, the Arctic vortex speeds up the process of heat transfer to the North Pole, absorbing part of the heat flow, moving to the north.
Additional heat removal accelerated the movement of water in Arctic "conveyor currents", which increased its influence on climate. For example, trends in the development and Renfryu Kondrona transferred about 56% more water compared to the ocean currents in the "normal" climate model.
As the authors of articles are major differences in the simulation results suggest that the Arctic storms are an important factor in regulating the climate of our planet, which can not be ignored in the modeling. According to them, refinement of models to help better predict climate change, which will occur in the northern hemisphere in the coming years.