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satellite view of valley fog
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TheGrenc



Joined: 24 Sep 2007
Posts: 2421

PostPosted: Sat Nov 14, 2009 15:42 pm    Post subject: Reply with quote

Frank,

Good job. Both Mark and Phil have good suggestions.

I echo Phil's reservations about using "heat" as a noun in the context of radiation. In my opinion, "heat" should only be used as an adjective, and it should never be used as a noun. Using "heat" as a noun eventually leads to vapid statements such as "heat rises". Hot air rises, but not "heat".

Talking about "heat being radiated" is even more dangerous, in my opinion. If "heat rises", as is the common notion, then logic suggests that heat can only be radiated upward. If you buy into this, you'll have your hands full trying to correctly explain the downwelling radiation from clouds.

I never use "heat" as a noun. It is a seed that, once planted, leads to the spread of weeds in science.

Hope this helps. Otherwise, very well done! Lee
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Frank.D



Joined: 09 Oct 2007
Posts: 291

PostPosted: Mon Nov 16, 2009 02:38 am    Post subject: Reply with quote

Thanks Mark, Phil & Lee, I have been struggling with how to word the radiation phrase but Lee's comments really help.

Updated description below:

Valley fog in the mountainous regions of Pennsylvania and southern New York is visible in this GOES visible satellite image for the morning of September 5, 2009. As imaged from space, the light-colored fog clearly marks the dendritic drainage pattern in the valleys. This valley fog is an example of radiation fog, which forms under clear night skies when the ground cools by radiating infrared energy upward into space without clouds which would radiate infrared energy back to Earth. The cool ground surface then cools the air close to the surface by thermal conduction, and fog forms as the air temperature drops to the dew point and becomes saturated. A contributing factor is drainage of air that cools at the ridgetops and upper slopes and becomes more dense and flows downward into the valley floors, enhancing the cooler temperatures. Additionally, water in the rivers and creeks is relatively warm during late summer and early autumn and helps to supply the moisture, while increasingly long nights allow more hours of radiation, more cooling of the surface and the air in contact with the surface, and more widespread fog throughout the valleys. A deep high pressure ridge extending well into the atmosphere provides the conditions of clear skies and calm winds. The fog often dissipates several hours after sunrise.

Cheers,
Frank

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MAThornton



Joined: 20 Sep 2007
Posts: 1339
Location: Cleveland, Ohio

PostPosted: Mon Nov 16, 2009 12:39 pm    Post subject: Reply with quote

Frank,

The third sentence that begins "the valley fog is an example...." seems a little awkward. Maybe breaking it into two sentences might help it flow better.

Mark

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Mark Thornton
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philnyc



Joined: 23 Sep 2007
Posts: 2819
Location: Brooklyn, New York

PostPosted: Mon Nov 16, 2009 18:49 pm    Post subject: Reply with quote

Valley fog in the mountainous regions of Pennsylvania and southern New York is visible in this GOES visible satellite image for the morning of September 5, 2009. As imaged from space, the light-colored fog clearly marks the dendritic drainage pattern in the valleys. This valley fog is an example of radiation fog, which forms under clear night skies when the ground cools by radiating infrared energy upward into space without clouds which would radiate infrared energy back to Earth. The cool ground surface then cools the air close to the surface by thermal conduction, and fog forms as the air temperature drops to the dew point and becomes saturated. A contributing factor is drainage of air that cools at the ridgetops and upper slopes and becomes more dense and flows downward into the valley floors, enhancing the cooler temperatures. Additionally, water in the rivers and creeks is relatively warm during late summer and early autumn and helps to supply the moisture, while increasingly long nights allow more hours of radiation, more cooling of the surface and the air in contact with the surface, and more widespread fog throughout the valleys. A deep high pressure ridge extending well into the atmosphere provides the conditions of clear skies and calm winds. The fog often dissipates several hours after sunrise.


Great, Frank! I really like it. Smile For my final idea, since you're at 217 words and need to cut, how about this?

"when the ground cools by radiating infrared energy upward into space without clouds which would radiate infrared energy back to Earth."
Why not just say "when the ground cools by radiating infrared energy upward into space." I think it'd be better to just avoid mentioning what clouds would do since it's adding more complexity and is really a separate issue anyway. You'll drop 10 words right there. And look how well that would flow into the next sentence:
"when the ground cools by radiating infrared energy upward into space. The cool ground surface then cools the air close to the surface by thermal conduction, ...

Just my last thoughts. I guess you can tell I'm a frustrated writer. Smile

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Phil Lutzak
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Frank.D



Joined: 09 Oct 2007
Posts: 291

PostPosted: Wed Nov 18, 2009 03:31 am    Post subject: Reply with quote

Thanks again!
Revised version (with 200 words, hopefully the highest priority words):

Valley fog in the mountainous regions of Pennsylvania and southern New York is visible in this visible satellite image for the morning of September 5, 2009. The light-colored fog clearly marks the dendritic drainage pattern in the valleys. This valley fog is an example of radiation fog, which forms under clear night skies when the ground cools by radiating infrared energy upward into space. The cool ground surface then cools the air close to the surface by thermal conduction, and fog forms as the air temperature drops to the dew point and becomes saturated. A contributing factor is drainage of air that cools at the ridgetops and upper slopes, becomes more dense and flows downward into the valley floors, enhancing the cooler temperatures. Additionally, water in the rivers and creeks is relatively warm during late summer and early autumn and helps supply the moisture, while increasingly long nights allow more hours of radiation, more cooling of the surface and the air in contact with the surface, and more widespread fog throughout the valleys. A deep high pressure ridge extending well into the atmosphere provides the conditions of clear skies and calm winds. The fog often dissipates several hours after sunrise.

Thanks again,
Frank

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philnyc



Joined: 23 Sep 2007
Posts: 2819
Location: Brooklyn, New York

PostPosted: Wed Nov 18, 2009 14:06 pm    Post subject: Reply with quote

Great, Frank. Good luck and please make sure to let us know when they publish it.
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Phil Lutzak
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MAThornton



Joined: 20 Sep 2007
Posts: 1339
Location: Cleveland, Ohio

PostPosted: Thu Nov 19, 2009 13:22 pm    Post subject: Reply with quote

Frank,

The final version flows very nicely.

Mark

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Mark Thornton
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