NPEO 2008 Aircraft CTD-Chemistry Survey

 
North Pole region-

Compared with spring 2007, weather and particularly ice conditions were much more favorable for the Twin Otter CTD survey during 2008. Landings by skiplanes on unprepared ice floes were greatly aided by the nearly universal presence of smooth, first year ice which made locating landing sites relatively easy.

The NPEO hydrographic survey in 2008 began March 20 with the International Polar Year extended sampling program of the Beaufort Sea by Twin Otter. Fifteen CTD-Chemistry surface stations were obtained across the southern Beaufort from 136 °West out 10 163° West, in unusually cold air temperatures. Extending the IPY Beaufort coverage farther north than was reachable from Deadhorse, Alaska in the skiplane, a second Twin Otter on standard (thin) wheels and with dual, long-range ferry tanks flew two days in mid-April north from Deadhorse, dropping AXCTDs into open lead, and recording the profiles without landing. Eight successful CTD profiles were obtained.

Following the Beaufort Sea effort in March, the winch-equipped skiplane then staged to the Russian Ice Station Borneo via Inuvik, Resolute, and Alert, and completed 20 CTD-Chemistry stations (Cast numbers 16 through 35) in the North Pole region including five ocean sections from the Pole along 90°East, 135 °East, 180 °, 135 °West and the Greenwich meridian, through the month of April.

As in previous years, a sixth section along 90° West toward Alert was recorded by the Switchyard project during May. Switchyard also collected a large cluster of CTD only stations in the central Lincoln Sea.

2007CTD_Clickmap

2008 CTD
Station/Location
Position   
Cast Date and Time
Sta86_173W
85° 59.737' N 173° 23.234' W
2008-04-06/2110 UTC
Sta87_180
87° 00.696' N 178° 21.749' E
2008-04-07/0013 UTC
Sta86_136W
86° 19.560' N 135° 59.543' W
2008-04-08/1450 UTC
Sta87_137W
86° 54.427' N 136° 46.920' W
2008-04-08/1805 UTC
Sta85_90E
85° 03.527' N 089° 31.063' E
2008-04-10/1347 UTC
Sta86_90E
85° 59.270' N 090° 40.565' E
2008-04-10/1705 UTC
Sta8548_135E
85° 48.973' N 134° 18.001' E
2008-04-11/1424 UTC
Sta87_135E
87° 11.367' N 135° 19.802' E
2008-04-11/1813 UTC
Sta87_90E
86° 53.218' N 089° 34.192' E
2008-04-12/1251 UTC
Sta88_90E
88° 04.086' N 085° 54.767' E
2008-04-12/1600 UTC
Sta89_90E
89° 00.777' N 092° 51.532' E
2008-04-12/1921 UTC
Borneo_88_000
88° 21.846' N 015° 06.613' E
2008-04-13/2200 UTC
Sta88_180
88° 00.521' N 179° 37.990' W
2008-04-18/1215 UTC
Sta8835_135E
88° 38.576' N 135° 25.080' E
2008-04-18/1528 UTC
Sta89_180
88° 59.550' N 178° 49.710' E
2008-04-18/1826 UTC
Sta89_135W
88° 32.117' N 135° 07.050' W
2008-04-19/1141 UTC
Sta90_NP
89° 54.532' N 054° 16.311' E
2008-04-19/1514 UTC
Sta89_000
89° 02.634' N 000° 34.059' W
2008-04-19/1805 UTC
Sta86_000
86° 08.110' N 000° 16.788' E
2008-04-20/1115 UTC
Sta87_000
86° 57.898' N 000° 29.571' W
2008-04-20/1405 UTC

 

The Historical Trend in North Pole Hydrography shows the changes in salinity and temperature profiles at the North Pole since 1950 and through the NPEO surveys.

Data from the NPEO aerial hydrographic and chemistry surveys are permanently archived at the Arctic System Science (ARCSS) Data Coordination Center. Currently available are CTD Profiles and Seawater Chemistry.  These data plus certain preliminary data sets may be obtained via FTP at this website.