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On the causes of Formation of two Intertropical Convergence Zone in the western part of the Pacific Ocean and in the Indian Ocean

Über die Ursachen der Bildung von zwei intertropischen Konvergenzzonen (ITCZ) im westlichen Teil des Pazifischen Ozeans und im Indischen Ozean

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Summary

Numerical experiments were made in computing near-equatorial atmospheric circulation for a given field of sea surface pressure to make clear how much the baric field typical of the Indian-Pacific sector of the near-equatorial zone can be responsible for the formation of two ITCZ observed here on either side of the equator. It has been obtained that east of the equatorial pressure low centre the computed wind field is characterized by two zones of uprising air currents lying on either side of the equator, this being in agreement with the real data on ITCZ position, whilst west of the pressure low centre by only one zone of intensive upward air currents lying along the equator, this being in disagreement with the said data. It is suggested that a more detailed pattern of pressure distribution will be, apparently, able to account for the formation of two ITCZ also at the western periphery of equatorial pressure low; this question, however, need to be further studied.

Zusammenfassung

Es wurden numerische Experimente zur Berechnung der äquatomahen atmosphärischen Zirkulation für ein gegebenes Bodendruckfeld durchgeführt, um zu klären, wie weit das für die äquatornahe Zone des Pazifischen Ozeans typische Druckfeld an der Bildung von zwei intertropischen Konvergenzzonen, die dort zu beiden Seiten des äquators beobachtet werden, schuld ist. Es wurde gefunden, daß östlich vom äquatorialen Tiefdruckzentrum das berechnete Windfeld durch zwei Zonen aufsteigender Luftströme zu beiden Seiten des Äquators charakterisiert ist in Übereinstimmung mit der wirklichen Lage der ITCZ, während es westlich von dem Tiefdruckzentrum, damit nicht in Übereinstimmung, nur durch eine Zone mit intensiv aufsteigender Luftströmung entlang des Äquators gekennzeichnet wird. Es wird angenommen, daß eine detailliertere Form der Druckverteilung die Darstellung von zwei ITCZ auch an der westlichen Peripherie des äquatorialen Tiefs ermöglichen könnte. Dies erfordert jedoch noch weitere Untersuchungen.

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Authors and Affiliations

  1. Institute of Oceanology, Krasikova 23, 117218, Moscow, USSR

    Yu. L. Demin, Yu. A. Romanov & N. A. Romanova

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  1. Yu. L. Demin
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  2. Yu. A. Romanov
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  3. N. A. Romanova
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Demin, Y.L., Romanov, Y.A. & Romanova, N.A. On the causes of Formation of two Intertropical Convergence Zone in the western part of the Pacific Ocean and in the Indian Ocean. Arch. Met. Geoph. Biocl. A. 31, 303–321 (1982). https://doi.org/10.1007/BF02258582

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