Sentences with phrase «at deep ocean temperatures»

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This water is warming an average of 0.03 degrees Celsius per year, with temperatures at the deepest ocean sensors sometimes exceeding 0.3 degrees Celsius or 33 degrees Fahrenheit, Muenchow said.

A study described here today at the American Geophysical Union's biennial Ocean Sciences Meeting shows that RNA's chemical building blocks fall apart within days to years at temperatures near boiling — a finding that poses problems for some origin of life theories, especially ones picturing that life arose in scalding settings such as deep - sea hydrothermal vents.

Many of the deepest branches in Woese's tree, those that join nearest to the three - way junction of the kingdoms, turned out to belong to organisms that live at high temperatures, as in the fuming springs in Yellowstone Park or the volcanic vents that gash the ocean floor.

Field observations of microbes recovered from deep drill cores, deep mines, and the ocean floor, coupled with laboratory investigations, reveal that microbial life can exist at conditions of extreme temperatures (to above 110ºC) and pressures (to > 10,000 atmospheres) previous thought impossible.

Long continuous records of temperature and salinity at Ocean Weather Station M in the Norwegian Sea indicate that the deep water has also warmed noticeably.

But if something causes heat to be transferred from the ocean surface into its deeps more rapidly than usual, ocean surface temperatures could rise more slowly, not rise at all, or even fall despite the increased backradiation.

The structure of the ocean circulation basically anchors this region to something like pre-industrial temperatures, at least until deep bottom water originating in the North Atlantic also warms.

@ 48 If your speculation is correct, I assume that another consequence would be that, if / when concentrations of greenhouse gases start to drop, corresponding reductions in surface ocean / land temperatures would take place at a much slower rate than would otherwise be the case: the surplus heat stored in the deep ocean will gradually make its way to the ocean surface, and continue to warm the atmosphere for decades, if not longer.

Re Todd at # 1 and CM at # 5: Am I right in understanding that the key point is that it's quite possible for global surface temperatures to decrease even as the globe warms if more than the excess inflow of heat goes into the deep oceans?

Re # 9 and space loss vs. deep ocean loss: It does seem that if radiation to space was the loss, you'd see a correlated increase in the temperature at the top of the troposphere, which is some -73 C.

The oceans are stratified, warmer water floats on top of the huge volume of deeper ocean that is at maximum density and minimum temperature.

That is, if the world stabilized at its present temperature I suppose the deep ocean would eventually get warmer, as well as other changes.

SO just HOW can we justify that that the outflow in the computer MUST be less than inflow for the 250 years of the computer run, when clearly the daily temperature cycle will reestablish the equilibrium (at least for the atmosphere & ground — not sure about deep ocean equilibrium, BUT I also know that there is MUCH MUCH MORE energy stored in the Land (eg solid iron core of earth) than in the ocean & the GCMs do NOT address this either).

Forest et al. 2006 compares observations of multiple surface, upper air and deep - ocean temperature changes with simulations thereof by the MIT 2D climate model run at many climate parameter settings.

eadler2 January 10, 2015 at 5:54 pm ... When ocean surface temperatures cool, due to a La Nina, the warmer surface water is mixed deeper into the ocean and cooler ocean water flows along the surface of the Pacific.

ENSO at least says something PHYSICAL about how heat is being entrained in the deep ocean: a La Nina ought to anchor global surface temperatures to the deep ocean and cool it.

part of the discussion / questions about thermal expansion at low temperatures in the deep ocean is missing the key point that saltwater behaves very differently from freshwater.

The 0.09 C increase in deep ocean temperature may not be felt at the surface for 4000 years or more.

Max, some will take issue with my methods but this is a different look at the lead lag relationship of surface temperature and deep ocean temperature.

It seems we are still at a very early stage in acquiring knowledge on the deep oceans temperature changes.

I get notified daily of most of the new papers relating to climate matters (as a retired modeller — I still retain an interest), I have seen several recently regarding deep ocean temperature measurement and equipment that is used at multi depths.

This means it will take centuries to millennia for deep ocean temperatures to warm in response to today's surface conditions, and at least as long for ocean warming to reverse after atmospheric greenhouse gas concentrations decrease (virtually certain).

Because the deep oceans receive no heat input, at least not on the scale of the circulation time, they are fairly uniformly at the temperature of the descending polar waters, even below the equator.

Since the surface and deep ocean start at very different temperatures, and you only change surface heating by a small percentage, you actually would have a starting time that was pretty far out on the error function curve.

The whole issue of heat diffusing from the surface to the deep ocean is a boundary value problem, in which values at each boundary (the heat input at the top, and the temperature of the deep ocean) are fixed, and used to calculate what happens in between.

Elsewhere on this site there is a graph of overall ocean heat content which is building indicating that while the sst is decreasing slightly the overall ocean is warming, It is likely that this overall ocean warming which has nothing to do with changes to the atmospheric temperature because it is the sea surface and not the deep ocean that is in contact with the atmosphere is what is resulting in the overall rise in atmospheric CO2 concentration which is currenly increasing at 2ppmv / year.

CO2 is liquid at the temperatures and pressures of the bottom of deep oceans.

Water now returning to the surface having entered deep ocean during the MWP may be inducing release of oceanic CO2 in response to altered pH, and this release could be expected to provide the steady increase in atmospheric CO2 concentration (of at least 1.5 ppm / year) that is observed to be independent of temperature variations.

The second is a temperature driven process where cold water sinks at the poles cooling the deep ocean.

Namely, deep ocean temperature graphs for the Atlantic and Southern oceans show increased warming at a depth of around 1500 meters beginning roughly around the year 2000.

However, the uncertainty in the reconstructed sea level is tens of metres and the uncertainty in the Mg / Ca temperature is sufficient to encompass the result from our δ18O prescription, which has comparable contributions of ice volume change and deep ocean temperature change at the Late Eocene glaciation of Antarctica.

To reduce the upward energy flow from the bulk ocean it is not enough to change the temperature of the ocean skin at 10 microns deep.

The lag is a different (and mostly unresolved) problem: while the lag during warming periods is explainable as the about 800 year turnover time for deep ocean down / upwelling flows, the much longer delay of CO2 during periods of cooling towards a new ice age is difficult to explain, the more that methane does follow temperature far more closely, thus errors in ice age — gas age difference are not at the base of the lag...

In the letter, Clement also expressed deep concern for other victims of climate change impacts, such as the recent set of devastating hurricanes, more frequent and severe flooding, marine life die - offs as a result of warmer ocean temperatures, forests at risk from invasive insects, and so on.

Observations and numerical modeling reveal large fluctuations in the ocean heat available in the adjacent bay and enhanced sensitivity of ice - shelf melting to water temperatures at intermediate depth, as a seabed ridge blocks the deepest and warmest waters from reaching the thickest ice.

Then in his Figure 1 Hansen shows Antarctic glaciation when deep ocean temperature was approx 3deg C and later the N. hemisphere ice sheet forming at say 2.5 deg C deep ocean temperature.

If heat flow into the deeper ocean (under 300m) is driven independently of Global Average Surface temperature or the «greenhouse» effect, then we have no reason to suppose that the latter produces any «global warming» at all.

At page 3.44 we read «It will take centuries to millennia for deep ocean temperatures to warm in response to today's surface conditions.»

Big issue is the deep oceans at 2 * C have not warmed as far as the temperatures are concerned according ot measurements.

More succinctly, if deep ocean temperatures can naturally rise by 1 °C in 100 years without any change in CO2, then attributing changes in ocean temperature that are already «below the detection limit» for the last 200 years (or just ~ 0.1 °C since 1955) to anthropogenic CO2 forcing is highly presumptuous at best.