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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2023, Vol. 20, No. 4, pp. 281-296

On relationship between interannual variability of heat and moisture exchange parameters of the ocean-atmosphere system in the intertropical convergence zone

V.N. Malinin 1 , P.A. Vainovskу 2 , S.M. Gordeeva 1, 3 
1 Russian State Hydrometeorological University, Saint Petersburg, Russia
2 OOO Prognoz, Saint Petersburg, Russia
3 Shirshov Institute of Oceanology RAS, Moscow, Russia
Accepted: 12.07.2023
DOI: 10.21046/2070-7401-2023-20-4-281-296
The results of calculations of the radiation indices Ga and Gs characterizing the greenhouse effect, as well as the parameters of heat and moisture exchange between the ocean and the atmosphere over a 40-year period (1979–2018) for individual oceans and the oceanic region of the intertropical convergence zone (ITCZ) are discussed as a whole (10° N – 10° S), based on NCEP – DOE Atmospheric Model Intercomparison Project (AMIP-II) reanalysis archive data. The fundamental difference between the indices Ga and Gs is that if Ga characterizes the greenhouse effect of the atmosphere and mainly affects the variability of atmospheric convection and precipitation, then Gs, through the greenhouse effect, forms positive trends in the characteristics of heat and moisture exchange between the ocean and the atmosphere and simultaneously affects their interannual variability. A conceptual diagram of the relationship between the interannual variability of hydrometeorological parameters in the ITCZ has been compiled. The dominating effect of total precipitable water (TPW) is shown simultaneously on the formation of the interannual variability of Ga, as well as on the trend and variability of Gs. At the same time, the surface air temperature in the near-water layer of the ocean and the difference between precipitation and evaporation approximately equally affect surface air temperature variability. However, the trend in TPW is formed exclusively due to moisture exchange processes, since the trends in precipitation and evaporation are several times higher than the trend in surface air temperature. It is shown that precipitation determines the intensity of the ascending branch of the Hadley cell; serves as the “motor” of the meridional circulation of the atmosphere. At the same time, only 2 parameters have a dominant effect on precipitation: greenhouse effect in the troposphere, determined by the Ga index, and evaporation in the zone 0–10 S, which describe 87 % of the dispersion of interannual precipitation variability in the main zone of the ITCZ, north of the equator.
Keywords: greenhouse effect, intertropical convergence zone, ITCZ, Hadley cell, radiation indices, ocean heat and moisture exchange, trends
Full text

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