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Arctic 2002

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Last Updated: 18 January 2022

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Arctic cyclone activity is investigated in context of climate change and variability by using modified automated cyclone identification and tracking algorithm, which differ from previously used algorithms by single counting each cyclone. Investigation extended earlier studies by lengthening time period to 55 yr with 6-hourly time resolution, by documenting seasonality and dominant temporal modes of variability of cyclone activity, and by diagnosing regional activity as quantified by cyclone activity index. CAI integrates information on cyclone intensity, frequency, and duration into comprehensive index of cyclone activity. Arctic cyclone activity has increased during second half of twentieth century, while midlatitude activity generally decreased from 1960 to early 1990s, in agreement with previous studies. New findings include following. Number And Intensity Of Cyclones Entering Arctic From Midlatitudes Has Increase, Suggesting Shift Of Storm Tracks Into Arctic, Particularly In Summer. 2 positive tendencies of midlatitude cyclone activity before and after 1960-93 period of decreasing activity correlate most strongly with variations of cyclone activity in North Atlantic and Eurasian sectors. 3 synchronized phase and amplitude variations in cyclone activity over Arctic Ocean 70-90N and Arctic marginal zone 60-70N play critical role in determining variations of cyclone activity in Arctic as whole. 4 Arctic cyclone activity displays significant low-frequency variability, with negative phase in 1960s and positive phase in 1990s, of which 7. 8-and 4. 1-yr oscillations are superimpose. 7. 8-yr Signal Generally Corresponds To Alternation Of Cyclonic And Anticyclonic Regimes Of Arctic Sea Ice And Ocean Motions. Cyclone activity in Arctic is fundamental consideration in studies of high-latitude weather and climate. Wind and precipitation produced by these storms are responsible for some of most significant impacts of weather in high-latitude communities. Coastal erosion caused by Arctic cyclones is increasingly serious problem during periods when nearshore waters are free of sea ice. Cyclones also represent primary mechanism for transport of heat and moisture into Arctic, thereby offsetting deficits that arise from radiative and freshwater imbalances, respectively. In context of climate and climate change, likelihood that greenhouse warming will be amplified in polar regions has interesting implications for Arctic cyclones, since reduced pole-to-equator temperature gradient may alter major storm tracks of cyclones affecting Arctic. However, Boer's 1995 that poleward heat and moisture transports do not necessarily decrease in greenhouse warming scenario points to complexity inherent in relationships between latitudinal temperature gradients, poleward energy fluxes, and cyclone activity. Fact That Arctic Has Indeed Warm And Sea Ice Has Retreated By 10 Percentage -15 Percentage In Recent Decades Houghton Et Al. 2001 points to need for comprehensive examination of cyclone activity in Arctic during latter part of twentieth century and better understanding of its trends and variability.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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