I post pictures with my other account @Deme@lemmy.world

  • 3 Posts
  • 87 Comments
Joined 11 months ago
cake
Cake day: August 9th, 2023

help-circle
  • I did write “mostly” for a reason. Aluminium is used a lot in aerospace due to its low mass. There is a lot of matter falling from space naturally, but the composition is key to the effects that will have on the atmosphere. Satellites, spent stages etc. have different compositions to meteors.

    Over 20 elements from reentry were detected and were present in ratios consistent with alloys used in spacecraft. The mass of lithium, aluminum, copper, and lead from the reentry of spacecraft was found to exceed the cosmic dust influx of those metals. About 10% of stratospheric sulfuric acid particles larger than 120 nm in diameter contain aluminum and other elements from spacecraft reentry. Planned increases in the number of low earth orbit satellites within the next few decades could cause up to half of stratospheric sulfuric acid particles to contain metals from reentry.







  • Private weather station?

    It’s pretty much impossible to make reliable forecasts based on the data of a singular weather station. The initial data comes in from a variety of sources including satellites, radars, surface observation stations (weather stations) and upper air soundings around the globe. All of the above are maintained by public sector organizations who collaborate and share the data because the weather is an inescapably global thing. During WW2 the Germans actually set foot in Canada to set up a weather station in an attempt to spread the coverage of their observation network.

    Nowadays all that data is used as inputs for numerical weather prediction models, running on supercomputers in the basements of meteorological institutes and agencies. Big global ones like ECMWF and GFS are used pretty much by all meteorologists around the world, who look at those and other smaller, more local models. They compare the different forecasts and critically evaluate the probabilities of different outcomes. They apply their own judgement selecting the most credible raw forecast and then edit that if needed. All in all, it’s a very global effort.

    At least where myself and @Kusimulkku@lemm.ee are from, meteorologists at the public broadcasting company (where that title is a requirement for getting the job) collaborate closely with their colleagues at the national meteorological institute. Their job is to comprehend the situation as presented by the institute, decide which bits of it are important, and then boil that down into a smooth and easy to understand presentation.

    If a weather reporter isn’t an actual meteorologist, then there is an actual meteorologist behind the scenes who made the presentation for the reporter to present.





  • Deme@sopuli.xyzto196@lemmy.blahaj.zoneEurulevision
    link
    fedilink
    arrow-up
    7
    ·
    edit-2
    1 month ago

    Croatia sang about urbanisation and the decline of the countryside.

    Israel was 100% a political show no elaboration needed there.

    Finland sang about no rules - anarchism.

    Serbia was anti war, which is also a political position.

    Then there’s all the feminist and queer themes like with Ukraine, Spain and Switzerland. Arguably not political, but then again neither should be Palestinians deserving human rights.

    And these are just what comes to mind off the top of my head.