Problems of cloudiness parameterization in mathematical models of mountain glaciers

by

О.О. Rybak1, 2, 3, Е.А. Rybak2, I.А. Коrneva2, 4

1Institute of Water Problems or RAS, Moscow, Gubkina St., 3

2Institute of Natural and Technical Systems, Sevastopol, Lenina St., 28.

3Кabardino-Balkarian State University, Nalchik, Chernyshevskogo St., 173

4Institute of Geography of RAS, Moscow, Staromonetny per., 29, bld. 4

E-mail: o.o.rybak@gmail.com

DOI: 10.33075/2220-5861-2024-2-07-20               

UDC 551.89 551.583.7

EDN: https://elibrary.ru/athxqd

Abstract:

Solar radiation is generally considered to be the key factor determining the energy balance on the surface of mountain glaciers. Cloudiness is the most important regulator of radiation fluxes. Cloud cover attenuates direct solar radiation thus increasing the share of diffuse radiation. Under certain conditions, cloud cover enhances long-wave radiation. Difficulties associated with formalizing the characteristics of cloud cover in energy balance models of mountain glaciers are the reason to revise some commonly used calculation algorithms. In this paper, we analyze observational data on short-wave radiation on Dzhankuat and Garabashi glaciers in the Central Caucasus during the ablation seasons and those on cloudiness at the Terskol weather station. The results obtained allow us to conclude that in retrospective estimates of global radiation, direct use of cloud cover observations may lead to incorrect results. The paper proposes an alternative approach based on the use of theoretical calculations and observational data.

Keywords: solar radiation, cloudiness, radiation regime, atmospheric transparency, mountain glacier, meteorological observations, mathematical model.

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