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On the turbulent heat fluxes:A comparison among satellite-based estimates,atmospheric reanalyses,and in-situ observations during the winter climate over Arctic sea ice

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Advances in Climate Change Research 2023年第3期14卷 347-362页

作者： Zhi-Lun ZHANG Feng-Ming HUI Timo VIHMA Mats A.GRANSKOG Bin CHENG Zhuo-Qi CHEN Xiao CHENG School of Geospatial Engineering and Science Sun Yat-sen University Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Key Laboratory of Comprehensive Observation of Polar Environment(Sun Yat-sen University) Ministry of EducationZhuhai 519082China University Corporation for Polar Research Beijing 100032China Finnish Meteorological Institute Helsinki 00560Finland Norwegian Polar Institute Fram CentreTromsøN-9296Norway

The surface energy budget is crucial for Arctic sea ice mass balance calculation and climate systems,among which turbulent heat fluxes significantly affect the airesea exchanges of heat and moisture in the atmospheric boundary *** observations(*** and APPX)and atmospheric reanalyses(e.g.,ERA5)are often used to represent components of the energy budget at regional and pan-Arctic ***,the uncertainties of the satellite-based turbulent heat fluxes are largely unknown,and cross-comparisons with reanalysis data and insitu observations are *** this study,satellite-based turbulent heat fluxes were assessed against in-situ observations from the N-ICE2015 drifting ice station(north of Svalbard,JanuaryeJune 2015)and ERA5 *** turbulent heat fluxes were calculated by two approaches using the satellite-based ice surface temperature and radiative fluxes,surface atmospheric parameters from ERA5,and snow/sea ice thickness from the pan-Arctic Ice Ocean Modeling and Assimilation System(PIOMAS).We found that the bulk-aerodynamic formula based results could better capture the variations of turbulent heat fluxes,while the maximum entropy production based estimates are comparable with ERA5 in terms of root-mean-square error(RMSE).CERES-based estimates outperform the APP-X-based ones but ERA5 performs the best in all seasons(RMSE of 18 and 7 W m^(-2)for sensible and latent heat flux,respectively).The aireice temperature/humidity differences and the surface radiation budget were found the primary driving factors in the bulk-formula method and maximum entropy production(MEP)method,***,errors in the surface and near-surface temperature and humidity explain almost 50%of the uncertainties in the estimates based on the bulk-formula,whereas errors in the net radiative fluxes explain more than 50%of the uncertainties in the MEP-based results.

关键词： Arctic sea ice Surface energy budget turbulent heat flux Satellite observation Reanalysis Bulk-aerodynamic formula Maximum entropy production

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Numerical Analysis of Microholes Film/Effusion Cooling Effectiveness

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Journal of Thermal Science 2017年第5期26卷 459-464页

作者： Tomasz Ochrymiuk Institute of Fluid-Flow Machinery Polish Academy of Sciences (IMP PAN) Fiszera 14 80-952 Gdansk

Numerical simulations were performed to predict the film cooling effectiveness on the fiat plate with a three-dimensional discrete hole film cooling RSM-AKN turbulent heat transfer models based on variable turbulent Prandtl number approaches were considered. Obtained numerical results were directly compared with the data that came from an experiment based on Transient Liquid Crystal methodology. All implemented models for turbulent heat transfer performed sufficiently well for the considered case. It was confirmed, however, that the two-equation closure can give a detailed look into film cooling problems without using any time-consuming and inherently unsteady models. The RSM-AKN turbulent model was used in micoholes case too. The main target of simulations was maintain the same level of cooling efficiency ratio in both cases and confirm that is possible significantly reduce mass flows of the coolant in microholes case.

关键词： turbulent heat flux two-equation model turbulent Prandtl number film cooling microholes

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Numerical Prediction of Film Cooling Effectiveness over Flat Plate using Variable turbulent Prandtl Number Closures

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Journal of Thermal Science 2016年第3期25卷 280-286页

作者： Tomasz Ochrymiuk Institute of Fluid-Flow Machinery Polish Academy of Sciences(IMP PAN)

Numerical simulations were performed to predict the film cooling effectiveness on the fiat plate with a three- dimensienal discrete-hole film cooling arrangement. The effects of basic geometrical characteristics of the holes, i.e diameter D, length L and pitch S/D were studied. Different turbulent heat transfer models based on constant and variable turbulent Prandtl number approaches were considered. The variability of the turbulent Prandtl number Prt in the energy equation was assumed using an algebraic relation proposed by Kays and Crawford, or employing the Abe, Kondoh and Nagano eddy heat diffusivity closure with two differential transport equations for the temperature variance ko and its destruction rate εθ The obtained numerical results were directly compared with the data that came from an experiment based on Transient Liquid Crystal methodology. All implemented models for turbulent heat transfer performed sufficiently well for the considered case. It was confirmed, however, that the two- equation closure can give a detailed look into film cooling problems without using any time-consuming and inherently unsteady models.

关键词： turbulent heat flux two-equation model turbulent Prandtl number film cooling

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Possible contribution of Arctic sea ice decline to intense warming over Siberia in June

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Atmospheric and Oceanic Science Letters 2022年第2期15卷 59-64页

作者： Ying Zhang Mengqi Zhang Jiehua Ma Dong Chen Tao Wang Climate Change Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Nansen-Zhu International Research Center Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Key Laboratory of Meteorological Disaster Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science&TechnologyNanjingChina

Siberia experienced intense heat waves in 2020,and this unusual warming may have caused more wildfires and losses of permafrost than normal,both of which can be devastating to *** on observational data,this paper shows that there was an intense warming trend over Siberia(60°–75°N,70°–130°E)in June during 1979–*** linear trend of the June surface air temperature is 0.90℃/10 yr over Siberia,which is much larger than the area with the same latitudes(60°–75°N,0°–360°,trend of 0.46℃/10 yr).The warming over Siberia extends from the surface to about 300 h *** geopotential height in the mid-to-upper troposphere plays an important role in shaping the Siberian warming,which favors more shortwave radiation reaching the surface and further heating the overlying atmosphere via upward turbulent heat flux and longwave *** Siberian warming is closely related to Arctic sea-ice decline,especially the sea ice over northern Barents Sea and Kara *** experiments carried out using and atmospheric general circulation model(IAP-AGCM4.1)confirmed the contribution of the Arctic sea-ice decline to the Siberian warming and the related changes in circulations and surface fluxes.

关键词： Intense Siberian warming Arctic sea ice decline Surface radiation flux turbulent heat flux

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