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Title: THE INDOOCEAN DIPOLE SIGNATURE IN EUROPEAN SUMMERTIME SURFACE AIR TEMPERATURE AND PRESSURE FIELDS
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THE INDOOCEAN DIPOLE SIGNATURE IN EUROPEAN SUMMERTIME SURFACE AIR TEMPERATURE AND PRESSURE FIELDS
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1314-2704
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English
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20
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4.1
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The Indian Ocean Dipole (IOD) signature in European summertime surface air temperature (SAT) and sea level pressure (SLP) fields were investigated in this study. The SAT and SLP anomalies of the surface fields over the European region associated with the IOD variability are described based on the results of experiments with atmospheric general circulation model and re-analysis data. It is shown that the prevalent positive significant SAT/SLP anomaly tends to form over Central/Eastern Europe in the negative phase of the IOD events. That accompanied by weak and insignificant negative SAT/SLP anomalies in July-August over Western Europe. The opposite anomalies in sign have appeared in the positive IOD phase. The ensemble simulation gave evidence that the European summertime atmospheric response carries the nonlinear effect on stepping up the values of SST IOD anomalies in the Indian Ocean. The composite difference between the negative and positive phases of the IOD, constructed based on the re-analysis of 20CR data, generally confirms the described simulation results of the ensemble climate model for the SAT/SLP fields. However, it can be only noted a slight shift toward the east of the European region in 20CR re-analysis data compared with the simulation. In addition, the amplitude of the obtained pattern based on 20CR re-analysis has 2-3 times high values than in the simulations. It might have resulted from the low 20CR re-analysis cases with pure IOD years in the last century, when the other oscillations (North Atlantic oscillation, El Nino-Southern oscillation and others) are in the neutral phase.
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conference
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20th International Multidisciplinary Scientific GeoConference SGEM 2020
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20th International Multidisciplinary Scientific GeoConference SGEM 2020, 18 - 24 August, 2020
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Proceedings Paper
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STEF92 Technology
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International Multidisciplinary Scientific GeoConference-SGEM
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SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; C
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531-538
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18 - 24 August, 2020
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website
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cdrom
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7272
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surface air temperature; sea level pressure anomalies; Indian Ocean dipole teleconnection; European region; atmospheric general circulation model
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