Sign up | Login with →

Comments by Jim Baird Subscribe

On Are Negative Emissions a "Myth?"


"The only three options we would be left with"?

You ommitted one Noah, hopefully not by design? You can also move the surface ocean heat, which represents 93% of the impact of global warming, into the ocean abyss. In that process you can produce the equivalent amount of energy that is currently being derived from fossil fuels and address sea level rise and storm surge, which are the greatest risks of climate change. There are no land issues involved and these processes occur in no one's backyard.

As one colleague has suggested this is a lot of wins for one technology, which can also be mated with the production of "supergreen hydrogen", which is another CDR technique.

December 12, 2014    View Comment    

On Supercritical Carbon Dioxide Power Cycles Starting to Hit the Market

Thanks Bob this article speaks of rotational speeds of between 100,000 and 230,000 rpm which always seemed to me to render electricity production pretty problematic.

December 4, 2014    View Comment    

On Supercritical Carbon Dioxide Power Cycles Starting to Hit the Market

Thanks EP. Colleagues are considering CO2 as a working fluid for ocean thermal energy conversion system using a heat pipe to convey the vapor to deep water for condensation. The evaporator temperatures would be in the range of 27 to 30C. Although this is below the critical temperature I understand the vapor becomes more and more dense as it approaches 31C thus it acts increasingly like a liquid?

December 4, 2014    View Comment    

On Supercritical Carbon Dioxide Power Cycles Starting to Hit the Market

Ed these turbines are pretty amazing. They turn however at incredibly high speeds. I have been unable to figure out how you mate these little turbines turning at enormous velocity to generators of a capacity that can produce useful power. If you could point me to any literature in this regard I would be greatful. Thanks.

December 4, 2014    View Comment    

On Nuclear and Renewables Shared Goal and Comparative Costs

Tracey you are to be commended for this thought provoking and extensively debated article.

November 30, 2014    View Comment    

On From Coast to Coast to Coast, Canada's Ocean Temperatures Approach 4 Degrees Celsius Above Normal

Futher to comments below, this chart shows the vagaries of various types of temperature measurements. Although it does not include 2014, some measurements indicate that the record of 1998 was already exceeded.

November 30, 2014    View Comment    

On From Coast to Coast to Coast, Canada's Ocean Temperatures Approach 4 Degrees Celsius Above Normal

Been there. At issue seems to be the accuracy of these measurements. I am in no position to judge.

November 30, 2014    View Comment    

On From Coast to Coast to Coast, Canada's Ocean Temperatures Approach 4 Degrees Celsius Above Normal

Mark, I took from their introduction "the satellite microwave sounding units measure lower troposphere rather than surface temperatures and so are not directly comparable with the in situ temperature record. Furthermore, there are temporal uncertainties in the satellite record arising from satellite failure and replacement and the numerous corrections required to construct a homogeneous record (Karl et al. 2006). Contamination of the microwave signal from different surface types is also an issue, particularly over ice and at high altitude (Mears et al. 2003)." a general uncertainty about satelite data, which may not have been the author's intent.

In general I would put my faith however in NOAA's analysis as opposed to Wood for Trees but wether or not this year or 1998 turns out to be the warmest to date the interim has been marked by lower temperatures generally attributed to increased uptake of heat by the deep oceans. The essence of this piece is a way to perpetuate this uptake which is an opportunity as well to produce carbon free energy in abundance.

November 29, 2014    View Comment    

On From Coast to Coast to Coast, Canada's Ocean Temperatures Approach 4 Degrees Celsius Above Normal

Mark readers can read Cowitan and Ways paper Coverage bias in the HadCRUT4 temperature series and its impact on recent temperature trends and make up their own mind which is the best approach to estimating global temperatures.

Their conclusion, "The existence of bias in recent global mean temperature estimates has been confirmed by multiple means. This bias leads to an underestimation of recent temperature trends." is telling. 

The main problem with satellite data such as RSS is that it doesn't include temperature analysis below 70 degrees south latitude or above 82.5 north latitude and as pointed out in the piece and by Cowtan and Way these regions, particularly the Arctic are warming faster than anywhere else.

 


November 28, 2014    View Comment    

On From Coast to Coast to Coast, Canada's Ocean Temperatures Approach 4 Degrees Celsius Above Normal

Sid clean isn't good enough. The planet is warming on account of the gases already in the atmosphere. It will take 1000 years to remedy this even if we don't add another ounce of greenhouse gas. The oceans are taking up the lion's share of the warming but will gradually give this back once the greenhouse gases moderate.  To my mind we need to do something with the heat in the oceans, which can in part be converted to the energy we need and in that process most of the rest would be moved to the safety of the ocean deep; at least three times deeper than shown in the above image where it has gone to about 300 meters in the western Pacific. That heat was not really mixed and diluted.  It was still stratified above the thermocline and thus is able to slosh back to the east once the winds that drove it in the opposite direction subsided. If it had been mixed below the thermocline its return would have been much slower. Estimates are it would comeback at a rate of about 4 meters/year. In 250 years, if all fossil fuels have been replaced, its warming influence would not be compounded, as is happening now, with the heating due to radiative forcing. At that time the returning heat could also be driven back down with the production of more OTEC energy IMHO.

November 27, 2014    View Comment    

On From Coast to Coast to Coast, Canada's Ocean Temperatures Approach 4 Degrees Celsius Above Normal

The first ten months of 2014 (January–October) were the warmest such period since record keeping began in 1880, with a combined global land and ocean average surface temperature 0.68°C (1.22°F) above the 20th century average of 14.1°C (57.4°F), surpassing the previous record set in 1998 and tied in 2010 by 0.02°C (0.04°F). 2014 is currently on track to be the warmest year on record. NOAA

October had the highest Land and Ocean temperature as did September, August, June, May and April.

http://www.ncdc.noaa.gov/sotc/global/2014/10

http://www.ncdc.noaa.gov/sotc/global/2014/9

http://www.ncdc.noaa.gov/sotc/global/2014/8

http://www.ncdc.noaa.gov/sotc/global/2014/6

http://www.ncdc.noaa.gov/sotc/global/2014/5

http://www.ncdc.noaa.gov/sotc/global/2014/4

November 27, 2014    View Comment    

On The "Historic" US-China Climate Change Deal Confirms that We are Failing in the Fight Against Climate Change

Hopefully a picture is worth a thousand words.


It is not perpetual motion. Both the tropical surface and polar melting are driven by solar energy.

OTEC does cool the surface, which is what needs to occur. The question is where does the heat go that condenses the working fluid? I suggest it should be released as deeply as possible, which only occurs with the heat pipe design.

November 18, 2014    View Comment