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emission of DMS from an algal bloom

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  • strobusnana
    In the past five years evidence has accumulated, particularly from the careful long term investigations of Ayers and his colleagues in Australia, that
    Message 1 of 702 , Feb 11, 2002
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      "In the past five years evidence has accumulated,
      particularly from the careful long term investigations of
      Ayers and his colleagues in Australia, that establishes
      a direct connection between algal growth,
      atmospheric methane sulphonic acid and cloud condensation
      nuclei. This is true for the atmosphere over all the
      world's oceans, even the North Atlantic in spite of the
      huge production of cloud condensation nuclei from
      fossil fuel combustion on the land surfaces around it.
      Indeed we can now say that, but for the algal production
      of dimethyl sulphide (DMS),clouds over the world's
      oceans would be less dense and the world would be a
      hotter place. <br><br>An important missing link is the
      geophysiological connection between climate and the emission of
      DMS by the algae. We do not yet know if changes in
      the sea surface temperature affect algal growth and
      the algal emission of sulphur gases. A tantalizing
      indication of an indirect link between DMS and climate comes
      from observations that suggest that an increase in
      cloud cover, algal density and wind velocity has
      occurred over the oceans in the past decade."<br><br>---
      <br><br>The above excerpt is from a United Nations Lecture
      given by James Lovelock - [Gaia Theorist].<br>The
      complete lecture can be read at the URL given
      below.<br><br><br><a href=http://www.unu.edu/unupress/lecture1.html target=new>http://www.unu.edu/unupress/lecture1.html</a><br>The Evolving Gaia Theory<br><br><br>I enjoyed the
      "hard science" discoveries of this lecture.<br>onchange
    • b1blancer_29501
      On Feb 28th, the Interplanetary Magnetic Field swung to a strong south-pointing orientation. That, coupled with an elevated solar wind speed and density,
      Message 702 of 702 , Mar 1, 2002
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        On Feb 28th, the Interplanetary Magnetic Field
        swung to a strong south-pointing orientation. That,
        coupled with an elevated solar wind speed and density,
        triggered a G-1 class geomagnetic storm. The result was
        some high latitude aurora. See this link for a
        photgraph of aurora observed over Quebec :
        <a href=http://www.spaceweather.com/aurora/images/01mar02/Moussette2.jpg target=new>http://www.spaceweather.com/aurora/images/01mar02/Moussette2.jpg</a> . As of right now, there are 3 sunspot regions,
        namely 9839, 9842, and 9845, that appear to be capable
        of producing M-class flares. Regions 9839 and 9842
        are close to rotating out of view over the western
        limb of the solar disk. Sunspot region 9845, however,
        is close to the sun's central meridian. A rather
        large coronal hole is also approaching the sun's
        central meridian, and coming into an Earth-pointing
        position. High speed colar wind gusts are likely around the
        first of next week.<br><br>The current solar and
        geomagnetic conditions are :<br><br>NOAA sunspot number :
        153<br>SFI : 188<br>A index : 10<br>K index : 1<br><br>Solar
        wind speed : 372.3 km/sec<br>Solar wind density : 4.4
        protons/cc<br>Solar wind pressure : 1.1 nPa<br><br>IMF : 8.4
        nT<br>IMF Orientation : 0.7 nT North<br><br>Conditions for
        the last 24 hours : <br>Solar activity was low. The
        geomagnetic field was quiet to unsettled. Stratwarm Alert
        exists Friday.<br><br>Forecast for the next 24 hours
        :<br>Solar activity will be low to moderate. The geomagnetic
        field will be quiet to unsettled.<br><br>Solar Activity
        Forecast :<br>Solar activity is expected to be low to
        moderate for the next three days. Region 9845 is a
        possible source for isolated M-class
        flares.<br><br>Geomagnetic activity forecast :<br>Geomagnetic field activity
        is expected to be mainly quiet to unsettled, until
        the onset of high speed stream effects from a
        recurrent coronal hole begin to develop by day three of the
        forecast period. Isolated active conditions are
        anticipated thereafter.<br><br>Recent significant solar flare
        activity :<br>None
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