[Coral-List] OTEC around coral reefs

[Bruce Carlson]

Here are some temperatures we recorded in the Solomon Islands using T-D sensors on Nautilus traps.  Temps were logged once per minute over roughly 20 hour time span (time varied per trap set). 
These are the max/min temps recorded at the stationary traps resting on the bottom.

264 meters  	12.44 - 15.96C
295 meters	11.24 - 14.82C
316 meters	10.44 - 12.48C	

Bruce Carlson

> On Jun 23, 2020, at 8:31 AM, Dennis Hubbard via Coral-List <coral-list at coral.aoml.noaa.gov> wrote:
> 
> Doug:
> 
> When we made Alvin dives off the north coast of St. Croix, the temperature
> registered on the sub's thermistor read WELL above freezing until we were
> WELL beyond 2000 meters. I can't easi;y get to my notes due to Covid, but
> the temperatures weren't particularly low (or the nutrients particularly
> high - Susan Williams participated in the project) until we got a lot
> deeper (remember - no Gulf Stream).
> 
> Denny
> 
> On Tue, Jun 23, 2020 at 8:18 AM Douglas Fenner via Coral-List <
> coral-list at coral.aoml.noaa.gov> wrote:
> 
>> I bet if you go deep enough (likely 600 feet or more) it will be close to
>> freezing.  That's true of most all of the world's oceans, so far as I know
>> (with exceptions such as shallow continental seas such as the
>> Arabian/Persian Gulf which has a maximum depth of around 295 feet).
>> 
>> On Mon, Jun 22, 2020 at 3:10 AM Melbourne Briscoe via Coral-List <
>> coral-list at coral.aoml.noaa.gov> wrote:
>> 
>>> "Cold" water near Bonaire isn't very cold. Efficiency is going to be very
>>> low.
>>> 
>>> On Thu, Jun 18, 2020 at 2:22 PM Alina Szmant via Coral-List <
>>> coral-list at coral.aoml.noaa.gov> wrote:
>>> 
>>>> Eric: with deep cold water comes nutrients.  Be concern about local
>> algal
>>>> blooms.
>>>> 
>>>> 
>>>> 
>>>> Sent from my Samsung Galaxy smartphone.
>>>> 
>>>> 
>>>> 
>>>> -------- Original message --------
>>>> From: "Meesters, Erik via Coral-List" <coral-list at coral.aoml.noaa.gov>
>>>> Date: 6/17/20 8:36 AM (GMT-05:00)
>>>> To: coral-list at coral.aoml.noaa.gov
>>>> Subject: [Coral-List] OTEC around coral reefs
>>>> 
>>>> Hi all,
>>>> There are now plans for an OTEC facility on Bonaire.
>>>> 
>>>> It basically means pumping up cold water from the deep to cool things
>> and
>>>> discharging warmer water (often shallower).
>>>> 
>>>>  *   Here are some examples: https://nelha.hawaii.gov/
>>>>  *   http://otecokinawa.com/en/OTEC/WaterUses.html
>>>> 
>>>> I can think of a lot of doomsday scenarios, but I'm looking for
>> reports,
>>>> assessments, thoughts, advice.
>>>> Does anyone have experiences with OTEC facilities in the neighbourhood
>> of
>>>> coral reefs?
>>>> it's often presented as the goose with the golden eggs, and governments
>>>> seem to fall for it easily, but apart from glossy sales talks, I can't
>>> find
>>>> objective reports or EIAs.
>>>> Thanks for your responses.
>>>> Best wishes,
>>>> Erik Meesters
>>>> Wageningen Marine Research
>>>> 
>>>> _______________________________________________
>>>> Coral-List mailing list
>>>> Coral-List at coral.aoml.noaa.gov
>>>> https://coral.aoml.noaa.gov/mailman/listinfo/coral-list
>>>> _______________________________________________
>>>> Coral-List mailing list
>>>> Coral-List at coral.aoml.noaa.gov
>>>> https://coral.aoml.noaa.gov/mailman/listinfo/coral-list
>>>> 
>>> _______________________________________________
>>> Coral-List mailing list
>>> Coral-List at coral.aoml.noaa.gov
>>> https://coral.aoml.noaa.gov/mailman/listinfo/coral-list
>>> 
>> 
>> 
>> --
>> Douglas Fenner
>> Lynker Technologies, LLC, Contractor
>> NOAA Fisheries Service
>> Pacific Islands Regional Office
>> Honolulu
>> and:
>> Consultant
>> PO Box 7390
>> Pago Pago, American Samoa 96799  USA
>> 
>> "mitigating climate change is the critical wedge to set coral reefs on a
>> recovery trajectory"  Duarte et al 2020 Rebuilding marine life Nature
>> 
>> "Already, more people die  <http://www.nws.noaa.gov/om/hazstats.shtml>from
>> heat-related causes in the U.S. than from all other extreme weather
>> events."
>> 
>> 
>> 
>> https://www.npr.org/2018/07/09/624643780/phoenix-tries-to-reverse-its-silent-storm-of-heat-deaths
>> 
>> 
>> Even 50-year old climate models correctly predicted global warmng
>> 
>> https://www.sciencemag.org/news/2019/12/even-50-year-old-climate-models-correctly-predicted-global-warming?utm_campaign=news_weekly_2019-12-06&et_rid=17045989&et_cid=3113276
>> 
>> "Global warming is manifestly the foremost current threat to coral reefs,
>> and must be addressed by the global community if reefs as we know them will
>> have any chance to persist."  Williams et al, 2019, Frontiers in Marine
>> Science
>> _______________________________________________
>> Coral-List mailing list
>> Coral-List at coral.aoml.noaa.gov
>> https://coral.aoml.noaa.gov/mailman/listinfo/coral-list
>> 
> 
> 
> -- 
> Dennis Hubbard
> Chair, Dept of Geology-Oberlin College Oberlin OH 44074
> (440) 775-8346
> 
> * "When you get on the wrong train.... every stop is the wrong stop"*
> Benjamin Stein: "*Ludes, A Ballad of the Drug and the Dream*"
> _______________________________________________
> Coral-List mailing list
> Coral-List at coral.aoml.noaa.gov
> https://coral.aoml.noaa.gov/mailman/listinfo/coral-list