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How cloud microphysics be represented in the climate models?
Question
  • Jan 2014
What are all the Microphysical schemes available?
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  • 34 Views
  • 3 Answers
In all cloud water, is there more liquid or is there more ice?
Question
  • Jan 2019
Clouds are important for their hydrological, thermodynamical, and radiative effects. That is, they redistribute water all over the globe, transport energy by up-taking and releasing the latent heat, and scatter/absorb solar and terrestrial radiation fluxes.
One question lingering in my mind is: which cloud phase (i.e., ice & liquid) possesses the most cloud water? Ice or Liquid? The reason I am interested in this question is that the understanding of the facts of cloud phase and its representation in climate models are relevant to various key problems, for example cloud microphysics (aerosol-cloud-precipitation interaction) and cloud radiative feedback (how cloud phase change modulates the scattering/absorption properties of clouds in a warming climate).
I have sawn some publications (e.g. Huang et al., 2015, JGR, doi:10.1002/2014JD022779) showing that there is more ice water than liquid water, globally. But I also found the retrieval of cloud water, especially ice water, suffer from tremendous uncertainty. So, I want to hear from the many talented people here, about your knowledge and opinions on this question. Thank you very much.
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  • 300 Views
  • 7 Answers
Does anybody know about the detailed WRF evaluations when applied to microscale problems (with horizontal grid sized of ~100 m)?
Question
  • May 2014
I am most interested in a coupled problem of a lake-surrounding atmosphere circulation. The submodel of lake circulation is quite sensitive to inputs obtained from WRF such as net and shortwave radiation as well as sensible heat flux. But it seems that WRF-calculated radiation fields are quite sensitive to grid resolution due to their dependancy on mixing ratios of cloud water, water vapor and other microphysics parameters. Therefore does anybody know the relevant studies which evaluate WRF against radiation and sensible heat flux measurements in addition to conventional meteorological measurements on such a small scale?
P.S. For those who are interested in practical applicability of such simulations I can recommend paper https://www.researchgate.net/publication/259466284_Model_based_analysis_of_effectiveness_of_the_engineering_solutions_designed_to_increase_cooling_capacity_of_Tashlyk_water_reservoir_of_South-Ukrainian_Nuclear_Power_Plant?ev=prf_pub
Deleted research item The research item mentioned here has been deleted
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  • 52 Views
  • 1 Answer
Could dust aerosols increase the radiative cooling of clouds? May it induce cellular convection in the upper part of the clouds?
Question
  • Feb 2014
Here is a report about the phenomena one can see regularly in Europe on the satellite images after dust storms in Africa. http://oiswww.eumetsat.org/WEBOPS/iotm/iotm/20100211_dust/report_kollath.pdf
http://oiswww.eumetsat.org/WEBOPS/iotm/iotm/20100211_dust/20100211_dust.html
I am not an expert of microphysics and radiation so I am looking for partners who can check that hypothesis which can be read in the above pdf report.
Here you can see a fresh case from today (21.02.2014) morning:
https://picasaweb.google.com/lh/photo/2WU55J4QJOsM1xziR4dWANMTjNZETYmyPJy0liipFm0?feat=directlink
https://picasaweb.google.com/lh/photo/mF3uSwi55z2wiOMfIGXzxdMTjNZETYmyPJy0liipFm0?feat=directlink
an another case from 28.02.2014.
http://mrstratus.blogspot.hu/2014/02/20140228-closed-cell-convection-at-top.html
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  • 53 Views
  • 8 Answers
Is there any proof for sulfate measurements for aerosol-cloud interaction using satellite?
Question
  • Jul 2015
I want to study sea-salt and sulfate impact on cloud microphysics using satellite measurements during monsoon season. I have assumed that from the references that whenever wind speed in greater than 9 m/s there is production of sea-salt and i have analysed the satellite data but i was confused for sulfate measurements. Is there any proof for the sulfate measurements?
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  • 23 Views
  • 2 Answers
What are the trends in tropopause temperature in CMIP5 climate models?
Question
  • Aug 2014
Does anyone know the answer to the above? I was just reading the SPARC July newsletter in which Andrew Gettelman suggested that the tropopause temperature should increase in the future due to climate change because of its effects on cloud in the TTL region. However, many years ago Thomas Reichler and I wrote a paper showing increases in tropopause temperature even for the older CM3-based coupled chemistry climate model runs at GFDL. Broadly, we identified the increase as primarily due to the increased strength of tropical upwelling. This seems to be a robust feature of climate model simulations, related as it is of course to the increased strength of the Brewer-Dobson circulation published by the celebrated author Neal Butchart. Related questions, then, are to what extent do the details of the TTL really matter, and have there been any quantitative changes in climate model predicted tropopause data? Perhaps it's the details of the TTL which give rise to the large scale average that we see in the B-D circulation. Then how good are our models at representing this upwelling change if they are relatively poor at representing the TTL region and cloud microphysics on the scale needed?   
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  • 66 Views
  • 5 Answers
Why does the snow probability for above freezing temperatures increase with decreasing relative humidity?
Question
  • Mar 2019
My latest results indicate that conceptual models can be improved by warming rain/snow thresholds for higher cloud bases, or lower relative humidity measured at the surface. Both of which are proxy data indicating a drier atmosphere the hydrometer must fall through.
I have found sources that state the microphysics are different in saturated and unsaturated environments, which gets me about 75% of the way to explaining the findings.
What I need to finish the theory is an article that support latent heat exchange rates (evaporation and sublimation) nearing or exceeding sensible heat exchange rates (melting) to allow snow to occur at warmer and drier surface conditions.
If there is a different explanation, I could look into changing the theory.
If I don't find something by the end of the month I could leave it somewhat unexplained, which is not desirable.
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  • 67 Views
  • 1 Answer
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