Monday, January 4, 2010

A Simple Explanation of Atmospheric Temperatures

When the sun heats the ocean’s surface, the temperature of the water is moderated by the mass of liquid sloshing around. So it does not immediately lose its heat into the atmosphere at night. The planet Mercury has neither ocean nor atmosphere, so its solid surface has a huge range of temperatures between day and night.

How long does our ocean and atmosphere take to lose it's heat? Notice the long lag time from winter solstice to the cold of February. The coldest time of the year comes a few weeks after the shortest day.

The warm waters of the Gulf Stream are a good example of the temperature moderating effect of our ocean. That is why on my Bahamas yacht adventure in the summer of 1975, I could sleep all night on deck in only my swimming trunks, without a blanket.

When I lived near the coast of northern California, the summer sun would heat the land surface to a very high temperature in the afternoon; let's use 100 degrees F as an example. The heated atmosphere rose, drawing in cool breezes from the ocean so that if you were within 3 miles of the shore, the air may only be say 50 degrees F. As soon as the sun went down, the land was no longer being warmed by the sun, so the cool breezes would extend much further inland, making a quick transition to cool temperatures. If I wore short sleeves in the morning and was caught without a sweater at dusk, my lips and fingernails would turn blue and I would seek fire or an artificial heat source as soon as possible.

There is no atmospheric greenhouse effect. There is only an ocean heat storage effect and a lesser atmospheric heat storage effect. The Earth is as cool as it is because it only has an average of about 2 miles of ocean across only 3/4 of its surface. Venus has well over 40 miles of high-pressure carbon dioxide that is more like our ocean than our atmosphere - the same pressure at its surface as our ocean has more than half a mile down. The large volume of high-pressure gas blowing around the whole planet at 300 MPH is what stores the heat on Venus and keep it an even temperature between day and night. It has nothing to do with the fact that the particular gas in the atmosphere happens to be carbon dioxide. In fact, IF the greenhouse conjecture were true (which it is not), what would cause the greenhouse effect on Venus would be sulphuric acid clouds, not CO2!

The sulphuric acid clouds on Venus are the equivalent of our "dihydrous monoxide" clouds (H2O, commonly known as water). The moisture in our clouds is more dense than the atmospheric gases and so it stores more heat. During the day, this is somewhat offset by the reflection of sunlight from the tops of the clouds.

If one allows oneself to really stop and think about where the heat of our planet comes from and how it gets stored, it is really not that difficult or complex. Some of the heat comes from the core of the earth, but most comes from the sun. I recently read a website that claimed more than twice as much heat comes from the greenhouse effect than from the sun! That seems laughable, but it is sad that people don't think things through before they speak or write. They so often just regurgitate what they've been force-fed by a scary movie or a political document.

2 comments:

  1. You said:
    There is no atmospheric greenhouse effect. There is only an ocean heat storage effect and a lesser atmospheric heat storage effect.

    I am not sure you are understanding this in it's greater context. Radiative physics and laboratory measurements show that CO2 traps heat. Specifically, light in the infrared spectrum will be absorbed by CO2 molecules and then re-radiate it in all directions.

    What this means is for an atmosphere (even with ~300ppm of CO2) that when longwave radiation (the infrared radiation I just mentioned) escaping into space from Earth's surface, is absorbed by CO2 then re-emitted in all directions. i.e if there is an increase in CO2 in the atmosphere then radiative physics predict that extra heat will be trapped. Where is this heat stored? The extra heat is stored in the oceans but that is another story.

    It is interesting that you mention the planets. Did you know that the composition of Mars' atmosphere is 95% Carbon Dioxide? However the density of the Martian atmosphere is only 1% of Earth. So predictably it will have a much cooler surface temperature than earth but still enough to raise the temperature by 5 degrees C than if it had no atmosphere at all!

    Your correct in saying how bad it is when people don't think things through before they speak or write, but quite often I think it is unfortunately due to people trusting news sources that just aren't reliable.

    You list The Great Global Warming Swindle as a favourited DVD. Would you be suprise to learn they fabricated graphs prior to the DVD release and had to re-edit the film?

    I also suggest you read some information here as a primer if you are interested in learning more about climate change if you still don't believe it is real.

    http://laymans-guide.com/introduction

    ReplyDelete
  2. The "greater context" is exactly what I have come to understand that inspired my article. Regarding "radiative physics and laboratory measurements", you should read this peer-reviewed article http://arxiv.org/PS_cache/arxiv/pdf/0707/0707.1161v4.pdf.
    Regarding Mars, any atmosphere at all will moderate temperature fluctuations, regardless if it is nitrogen, carbon dioxide or whatever.
    Regarding the DVD, that video is trying to counteract all the misinformation and fabrications in "An Inconvenient Truth". So your link is to someone who believed Al Gore's movie and is attempting to debunk the debunkers. I only listed that DVD because Amazon sells it. The real science is found in places like this: http://www.populartechnology.net/2009/10/peer-reviewed-papers-supporting.html

    ReplyDelete