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The Bermuda Testbed Mooring (BTM)

Ocean Physics Laboratory

BTM Mooring Operations

The BTM is deployed roughly twice per year for 6-month data records. Specific instrumentation and depth of instruments may differ from deployment to deployment. Click on the deployment numbers in the table below for associated mooring diagrams.

R/V Weatherbird Ship Schedule

Deployment Date Deployed Date Recovered Location
1 June 3, 1994 September 3, 1994 31o44.95'N, 64o10.17'W
2 September 16, 1994 January 28, 1995 31o44.75'N, 64o10.37'W
3 April 5, 1995 August 23, 1995 31o44'N, 64o10'W
4 August 29, 1995 November 22, 1995 31o43.68'N, 64o10.05'W
5 March 26, 1996 August 15, 1996 31o43.89'N, 64o09.89'W
6 August 20, 1996 January 22, 1997 31o43.42'N, 64o10.19'W
7 May 3, 1997 July 30, 1997 31o42.88'N, 64o09.02'W
8 August 7, 1997 November 20, 1997 31o42.89'N, 64o09.97'W
9 November 26, 1997 March 31, 1998 31o42.79'N, 64o10.31'W
10 November 11, 1998 March 19, 1999 31o43.07'N, 64o09.93'W
11 April 1, 1999 July 21, 1999 31o43.08'N, 64o10.14'W
12 July 29, 1999 November 6, 1999 31o42.60'N, 64o09.30'W
13 December 5, 1999 May 27, 2000 31o41.57'N, 64o09.04'W
14 June 1, 2000 November 29, 2000 31o43.214'N, 64o09.310'W
15 March 16, 2001 November 4, 2001 31o41.768'N, 64o10.523'W
16 December 6, 2001 February 24, 2002 31o43.14'N, 64o10.44'W
17 September 3, 2002 May 4, 2003 31o44.382'N, 64o9.720'W
18 May 10, 2003 November 13, 2003 31o43.695'N, 64o11.566'W
19 February 21, 2004 April 10, 2004 31o44.611'N, 64o10.182'W
20 May 4, 2004 September 28, 2004 31o43.610'N, 64o11.062'W
21 October 7, 2004 April 13, 2005 31o43.729'N, 64o11.037'W
22 May 13, 2005 September 27, 2005 31o43.977'N, 64o10.409'W
23 October 21, 2005 July 02, 2006 31o43.779'N, 64o09.601'W
24 July 14, 2006 March 1, 2007 31o43.610'N, 64o11.062'W
25 March 12, 2007 October 1, 2007 31o43.610'N, 64o11.062'W

Because the strength of mooring data is in temporal observations with depth, careful consideration goes into mooring design (i.e., sampling rates are carefully chosen and instruments are strategically placed). To aid in the determination of nitrate flux, nitrate sensors are placed at 80 m, in generally relatively nutrient poor waters near the edge of the euphotic zone (which extends from the surface to the 1% light level) and at 200 m (in nutrient rich waters). MORS packages, measuring apparent optical properties (i.e., those dependent on light geometry) including radiance and irradiance, are placed well within the euphotic zone at the surface, 15 m, and 35 m. The fact that they are close together is intentional, so that reasonable estimates of diffuse attenuation coefficient can be made. The BIOPS package measures inherent optical properties such as spectral attenuation and absorption, and is placed at 20 m and 90 m depths, aimed to be near the chlorophyll maximum (typically around 50 m, although this depth fluctuates). Further, an uplooking 150KHz acoustic Doppler current profiler (ADCP) provides high vertical resolution (~3 m) current data every 15 min. Temperature is sampled at 7 or 8 depths, and the data are used to calculate the degree of stratification and the depth of the mixed layer.

BBSR
Bermuda Biological Station for Research

Bermuda
BTM Site

New Buoy
New buoy (as of September 2002)

Recovery
Mooring Recovery

Old Buoy
Buoy