Sea Technology

NOV 2013

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Coastal Marine Environment Monitoring In Great Wall Cove Upgraded System in China Transmits Real-Time Data from Antarctic By Xiangnan Wang • Changlei Ma T he Fildes Peninsula of King George Isfrom the bottom up: the SBE 37 CTD, releasland is one of the regions experiencing er, ACDP, SBE 16 CTD and buoy. The meathe fastest temperature rise in the Antarctic. surement data, including CTD, pH, CHL and The meteorology data from 1985 to 2008 current, are saved in the control cabin and indicate that the air temperature variability transmitted in real time to the data transmisis 0.27° C every 10 years, showing an obsion subsystem via the cable. The upgraded vious climate warming trend. Meanwhile, control cabin contains an interface desigthe biota and biodiversity in King George nated for communication with another selfIsland is abundant. Thus, the new-generacontained underwater monitoring system to tion marine environment monitoring system form an underwater monitoring network. (NMEMS) developed by the National Ocean The power subsystem contains an arTechnology Center of China was deployed mored cable, providing power supply for the in Great Wall Cove to monitor the marine system from the coastal station. Serial RS485 environmental and ecological parameters. communication technology is used to transThe data will help to study the response of mit the data collected by the underwater the Antarctic ecosystem to global climate monitoring subsystem. The cable through change. the intertidal zone is buried to avoid the efThe Great Wall Cove located in the southfects of tide and ice. The data transmission east of Great Wall Station is a semienclosed subsystem can receive data at an interval bay with a 35-meter maximum depth. The of 30 minutes and transmit the compressed cove is affected by the current beyond it data via satellite daily. and the land-based thaw instreaming. The continuous temperature, salinity, chloPCMEMS rophyll (CHL) and other data for several The prototype system, PCMEMS, was seasons, combined deployed in the with historical data, Great Wall Cove in will be important for 2009 and 2010 and studying the Antarcoperated for four Deployment of the NMEMS in Great Wall Cove. (Top) Components of tic ecosystem. months and fve the NMEMS. months, respectiveNMEMS ly. The acquired data were used to inform a system upgrade. The prototype of the NMEMS is the polar coastal marine With a higher networking ability and improved survivenvironment monitoring system, known as PCMEMS, which ability, the NMEMS was deployed in Great Wall Cove in was deployed in 2009 and 2010. The new system consists of January 2012 during the 28th Chinese National Antarctic Rethe underwater monitoring subsystem, the data transmission search Expedition and has been operating for more than nine subsystem and the power subsystem. months. The NMEMS acquired more than 13,000 groups of The underwater monitoring subsystem consists of two data at 30-minute intervals up to October 17, 2012. The data Sea-Bird Electronics Inc.'s (Bellevue, Washington) SBE 16 have been preliminarily analyzed. CTDs, a Sea-Bird Electronics SBE 37 CTD, a Teledyne RD Instruments (Poway, California) WHM600 acoustic Dopler Environmental Variables current profler (ADCP) and a pair of EdgeTech (West WareThe range of temperature and salinity change is -1.92 to ham, Massachusetts) acoustic releasers mounted on the 2.67° C and 33.51 to 34.26, respectively. The temperature bottom framework. The instruments are arranged as follows fuctuated between 1 and 3° C until March 2012, and then www.sea-technology.com November 2013 / st 43

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