Japan Geoscience Union Meeting 2025

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[E] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS08] Processes of the Moist Atmosphere Across Scales

Wed. May 28, 2025 10:45 AM - 12:15 PM Exhibition Hall Special Setting (6) (Exhibition Hall 7&8, Makuhari Messe)

convener:Hiroaki Miura(The University of Tokyo), Daisuke Takasuka(Graduate School of Science, Tohoku University), Atsushi Hamada(University of Toyama), Satoru Yokoi(Japan Agency for Marine-Earth Science and Technology), Chairperson:Daisuke Takasuka(Graduate School of Science, Tohoku University), Hiroaki Miura(The University of Tokyo)

11:45 AM - 12:00 PM

[AAS08-11] Longwave irradiance and its temperature effects at different water vapor content and cloudiness according to modelling and measurements

*Natalia Chubarova1, Daria Piskunova1, Nickolay Petrov1, Marina Shatunova2, Julia Shuvalova2 (1.Faculty of Geography, Lomonosov Moscow State University, 119991 Moscow, Russia, 2.Laboratory of Detailed Numerical Weather Forecasts, Hydrometeorological Research Center of the Russian Federation, 123242 Moscow, Russia)

Keywords:longwave irradiance, precise radiative measurements, cloud solvers, ICON model, temperature effects

The study of longwave irradiance (LI) is important due to its sensitivity to greenhouse gases and cloudiness. The energy from this part of spectrum is dominating in radiative budget during the cold periods at most latitudes. Based on the modern ECRAD radiation model (Hogan ad Bozzo, 2018), which is widely used in different weather prediction and climate models (IFS, ICON, etc), we evaluated the conditions with extremely high values of longwave net irradiance (LNI)), including its positive values. We analyzed its cooling/heating rates and study thoroughly the geophysical conditions, in which they can appear, and their predictability. We revealed the pronounced effects of CWC (cloud water content), the bottom of cloud systems as well as cloud amount on high LNI levels during the cold periods. We also revealed a noticeable effect of water vapor content on LNI in these situations. The application of different aerosol cloud nuclei provides some changes in cloud microphysics, but do not have a vital role. In several situations, we showed a pronounced underestimating of longwave irradiance, and its effects on the decrease of temperature. We tested the obtained results of numerical experiments against precise radiative measurements using the new radiative complex RAD-MSU(BSRN) as well as some additional measurements of vertical temperature structure of the atmosphere up to 1000 meters according to the MTP-5 measurements and some other meteorological observations. We also analyze the quality of longwave irradiance evaluation in cloudy conditions using different cloud solvers such as (Triplclouds, McIca, SPARTACUS).