2011-06-18 04:29:43Deep ocean heat content changes estimated from observation and reanalysis product
Albatross
Julian Brimelow
stomatalaperture@gmail...
199.126.232.206

Anyone seen this?  News to me.  Their abstract:

"We calculated basin-scale and global ocean decadal temperature change rates from the 1990s to the 2000s for waters below 3000 m. Large temperature increases were detected around Antarctica, and a relatively large temperature increase was detected along the northward path of Circumpolar Deep Water in the Pacific. The global heat content (HC) change estimated from the temperature change rates below 3000 m was 0.8 × 1022 J decade−1; a value that cannot be neglected for precise estimation of the global heat balance. We reproduced the observed temperature changes in the deep ocean using a data assimilation system and examined virtual observations in the reproduced data field to evaluate the uncertainty of the HC changes estimated from the actual temporally and spatially sparse observations. From the analysis of the virtual observations, it is shown that the global HC increase below 3000 m during recent decades can be detected using the available observation system of periodic revisits to the same sampling sections, although the uncertainty is large."

2011-06-18 09:02:28
dana1981
Dana Nuccitelli
dana1981@yahoo...
64.129.227.4

Hadn't seen it.  How does their estimate compare to Purkey?

2011-06-18 09:14:05
Albatross
Julian Brimelow
stomatalaperture@gmail...
199.126.232.206

Don't know Dana. Does this help?  They use different units though.....and I'm too lazy to convert.  Trenberth got a trend in 0-2000 m OHC betwee 2003 and 2008 of 0.54 W m^-2.  For 1993 to 2008 0-700 m OHC trend was 0.64 W m-2 but I'm not sure if that is per year or what...jeez I'm tired.

 


"Mean local heat fluxes through 4000 m implied by abyssal warming below 4000 m from the 1990s to the 2000s within each of the 24 sampled basins (black numbers and colorbar) with 95% confidence intervals and the local contribution to the heat flux through 1000 m south of the SAF (magenta line) implied by deep Southern Ocean warming from 1000–4000 m is also given (magenta number) with its 95% confidence interval." (Purkey and Johnson, 2010)

 

We quantify abyssal global and deep Southern Ocean temperature trends between the 1990s and 2000s to assess the role of recent warming of these regions in global heat and sea level budgets. We compute warming rates with uncertainties along 28 full-depth, high-quality, hydrographic sections that have been occupied two or more times between 1980 and 2010. We divide the global ocean into 32 basins defined by the topography and climatological ocean bottom temperatures and estimate temperature trends in the 24 sampled basins. The three southernmost basins show a strong statistically significant abyssal warming trend, with that warming signal weakening to the north in the central Pacific, western Atlantic, and eastern Indian Oceans. Eastern Atlantic and western Indian Ocean basins show statistically insignificant abyssal cooling trends. Excepting the Arctic Ocean and Nordic seas, the rate of abyssal (below 4000 m) global ocean heat content change in the 1990s and 2000s is equivalent to a heat flux of 0.027 (±0.009) W m–2 applied over the entire surface of the Earth. Deep (1000–4000 m) warming south of the Sub-Antarctic Front of the Antarctic Circumpolar Current adds 0.068 (±0.062) W m–2. The abyssal warming produces a 0.053 (±0.017) mm yr–1 increase in global average sea level and the deep warming south of the Sub-Antarctic Front adds another 0.093 (±0.081) mm yr–1. Thus warming in these regions, ventilated primarily by Antarctic Bottom Water, accounts for a statistically significant fraction of the present global energy and sea level budgets.

2011-06-18 14:18:34
Ari Jokimäki

arijmaki@yahoo...
91.154.111.39

Here's the full text.

You know, you should follow the postings of AGW Observer, who included this paper to his research from last week series already in March. ;)

2011-06-18 15:11:23
Albatross
Julian Brimelow
stomatalaperture@gmail...
199.126.232.206

OK Ari, you made me blush!

Yes I should be ashamed.  Truth is, I ran into this when I was following up the the UColorado GSL story.

2011-06-18 15:30:53
Albatross
Julian Brimelow
stomatalaperture@gmail...
199.126.232.206

From the paper:

"A heat flux of 0.1 (0.07) W m−2 would be required through 3000 m (4000 m) to account for this HC increase."

So quite abit more than Purkey and Johnson, 2010.

2011-06-18 21:51:41
Rob Painting
Rob
paintingskeri@vodafone.co...
118.93.2.177

Some rather cool global maps in that paper. The vast area of cooling in the Pacific at 3-4000mtrs is interesting.

2011-06-18 22:29:33
Ari Jokimäki

arijmaki@yahoo...
91.154.103.90

"OK Ari, you made me blush!"

There's no need for that. After all, you gave me a chance to look around for the full text (which wasn't available back in March). :)

2011-06-18 22:31:01
Rob Painting
Rob
paintingskeri@vodafone.co...
118.93.2.177

I noticed one citation was for Deep Ninja!!!!!!

2011-06-18 22:42:15
Rob Painting
Rob
paintingskeri@vodafone.co...
118.93.2.177

Ari, that's a real interesting paper, you planning a post? 

2011-06-19 00:42:24
Ari Jokimäki

arijmaki@yahoo...
91.154.103.90

I'm not planning a post. I have taken a summer leave on writing climate science articles, at least news pieces. I'll perhaps try to do a round of maintenance on my blog's paperlists and perhaps make a few new lists - you know, have bit of fun for a change. :)

2011-06-19 05:35:27Deep Ninja - how cool is that?
John Cook

john@skepticalscience...
121.222.9.229
Someone should do a post about deep ocean heat and somehow work a Ninja metaphor into it - you know, those out of left field type posts that Rob Honeycutt writes :-)
2011-06-19 09:13:35
Rob Painting
Rob
paintingskeri@vodafone.co...
118.93.11.162

Bugger!!, one of those moments when they call for volunteers to step forward and everyone around you takes a step backward!

I've got so many half finished posts, but I'll get onto to this. Been meaning to self-school in graphics, being somewhat of a cartoonist when I was young. Got a good image in mind for Super Ninja!