2011-07-12 14:30:31The flow of Atlantic Ocean heat into the Arctic Ocean is now higher than any time in the past 2000 years
Daniel Bailey
Daniel Bailey
yooper49855@hotmail...
97.83.150.37

Ocean heat
An article published recently in the journal Science showed that the flow of ocean heat into the Arctic Ocean from the Atlantic is now higher than any time in the past 2000 years. The warm, salty Atlantic water flows up from the mid-latitudes and then cools and sinks below the cold, fresh water from the Arctic. The higher salt content of the Atlantic water means that it is denser than fresher Arctic water, so it circulates through the Arctic Ocean at a depth of around 100 meters (328 feet). This Atlantic water is potentially important for sea ice because the temperature is 1 to 2 degrees Celsius (1.5 to 3 degrees Fahrenheit) above freezing. If that water rose to the surface, it could add to sea ice melt.

Spielhagen, R.F., K. Werner, S. Sorensen, K. Zamelczyk, E. Kandiano, G. Budeus, K. Husum, T.M. Marchitto, M. Hald, 2011. Enhanced modern heat transfer to the Arctic by warm Atlantic Water, Science, vol. 331, pp. 450-453, 28.

Will post the graphics soon.

Keep getting a "can't copy" message when trying to upload the graphics, even after rebooting.

2011-07-13 03:19:31Graphics now available, if desired
Daniel Bailey
Daniel Bailey
yooper49855@hotmail...
97.83.150.37

Here are those graphics:

1

Figure 1.  Bathymetric map of the Fram Strait area and the eastern Arctic Ocean (inset; source: www.ibcao.org). Average sea ice coverage for April [1989 to 1995; stippled line: 1963 to 1969 (31)] and September (inset; 1979 to 2000; source: http://nsidc.org) is indicated by white shading. White arrows indicate ice flow direction in Fram Strait area. Red arrows indicate flow direction of Atlantic Water. Atlantic water flow is below halocline waters in the Arctic Ocean proper. Yellow spot marks station MSM5/5-712 at 78°54.94'N, 6°46.04'E, 1491-m water depth. BS, Barents Sea; LS, Laptev Sea.

 

2

Figure 2.  Water-mass structure of the upper 600 m at station MSM5/5-712. Seasonal variability of temperature (red lines) and salinity (blue lines) in the Atlantic Water (pink) is revealed by our measurements in summer (4 August 2007; bold lines) and early winter (11 October 2006; thin lines). The main habitat of planktic foraminifers in the eastern Fram Strait (16, 18) is marked by a dashed pattern.

 

3

Figure 3.  Planktic foraminiferal data and temperature reconstructions of upper Atlantic Water in the eastern Fram Strait over the past ~2100 years from sediment core MSM5/5-712-1. Thin lines are raw data, bold lines are three-point runningmeans. Black triangles on the age scalemark calibrated acceleratormass spectrometry 14C ages. (A) Fluxes of polar and subpolar planktic foraminifers (100- to 250-mm fraction). (B) Percentage of subpolar planktic foraminifers in the 100- to 250-mm fraction. (C) Summer temperatures at 50-m water depth (red) calculated by the SIMMAX Modern Analog Technique. Gray bars mark averages until 1835 CE and 1890 to 2007 CE. Blue line is the normalized Atlantic Water core temperature (AWCT) record (standard deviations) from the Arctic Ocean (1895 to 2002; 6-year averages) obtained from (21). (D) Summer temperatures (purple) calculated from Mg/Ca ratios in planktic foraminifers N. pachyderma (sinistral). Gray bars mark averages until 1835 CE and 1890 to 2007 CE. Blue line is the sea ice margin anomaly (11-year means, less ice is up) in the Barents Sea (BS) obtained from (5). Dashed lines mark less reliable data before 1850 CE. (E) Terrestrial Arctic [green, from (6)] and Northern Hemisphere [black, 25-year means, from (19)] temperature anomaly records with reference to the 980 to 1800 CE and 1961 to 1990 CE averages, respectively.

2011-07-13 04:20:29
grypo

gryposaurus@gmail...
173.69.56.151

oh look another hockey stick

2011-07-13 05:04:13
Alex C

coultera@umich...
67.149.101.148

Aha!  I thought I had seen that last graphic before, I recognize it from January.  Strange NSIDC took so long to post it.  Anyways I thought it was an interesting paper, certainly another set of hockey sticks.  I found and find it interesting that the MWP in each is not terribly pronounced, more-so in the NH data, which is from (19) which is Moberg's reconstruction.  Apparently the Arctic and ocean waters did not follow the warming, though the data resolution is kind of low for figures 3c and 3d.

2011-07-13 05:19:48Hockey sticks are good for...
John Hartz
John Hartz
john.hartz@hotmail...
98.122.98.161

knee-capping climate denier drones.

2011-07-13 05:47:48
Daniel Bailey
Daniel Bailey
yooper49855@hotmail...
97.83.150.37

Should someone have the time, it looks like an underwater hockeystick post in the making.

2011-07-13 06:07:08Daniel Bailey
John Hartz
John Hartz
john.hartz@hotmail...
98.122.98.161

Shouldn't all hockey stick articles be written by Canadian authors?

2011-07-13 06:56:48Agreed
Daniel Bailey
Daniel Bailey
yooper49855@hotmail...
97.83.150.37

3 Things:

  1. Detroit Red Wings
  2. I'm married to a Canadian national
  3. Da UP's proximity to Canada