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Antarctic Automatic Weather Station Program ANTARCTIC AUTOMATIC WEATHER STATION PROGR AM 30 Years of Polar Observations BY MATTHEW A. LAZZARA, GEORGE A. WEIDNER, LINDA M. KELLER, JONATHAN E. THOM, AND JOHN J. CASSANO A quest for automated meteorological observations in the Antarctic leads to a continent- wide network of automatic weather stations supporting research and forecasting. FIG. 1. A map of the Antarctic continent showing key geographical locations. HE QUEST FOR AN AUTONOMOUS WEATHER STATION (1950s AND 1960s). Obtaining weather observations has been an important T part of scientific discovery since the early days of exploration in the Antarctic. Understanding Antarctica’s weather was one of the primary objectives of the International Geophysical Year (IGY) of 1957/58 and led to continuous observations of the Antarctic. The Antarctic continent covers an area roughly 1.5 times the size of the continental United States, over 14 million square kilometers (Fig. 1); but with approximately 50 staffed stations established by the end of the IGY (Summerhayes 2008), there was a need for observing Unauthenticated | Downloaded 09/26/21 10:04 PM UTC weather at remote locations beyond coastal areas and THE FOUNDATION OF THE MODERN the peninsula area where main stations are located. AUTOMATIC WEATHER STATION (1970s). One of the first attempts at developing an Recording Antarctic automatic weather station. The next automatic weather station (AWS) for the Antarctic step in the development of the modern Antarctic AWS was called a “Grasshopper” AWS, also known as occurred in 1974 with the installation of a recording the XG-1, installed near McMurdo Station during AWS near Cordiner Peaks in West Antarctica the Deep Freeze II field season (1956/57) (U.S. Navy (82.87°S, 53.20°W; Fig. 1). Installed by Austin Kovacs 1965). By the early to mid-1960s, two additional of the Cold Regions Research and Engineering portable automatic weather stations (PAWS) that Laboratory (CRREL), the station was manufactured could measure temperature, pressure, wind speed, by Rauchfuss Instruments (RIMCO), Ltd. and re- and wind direction had been tested. One was known corded temperature, pressure, wind run, and wind as the “Pinball” or XB-1 system and was battery direction on a strip chart. This station only oper- powered, while the other system, XB-2, used two ated for 3 months. After recovery of the AWS 2 yr different power sources: batteries and nuclear power later, the strip charts were sent to Professor Werner (U.S. Navy 1965). One XB-1 system, installed at Schwerdtfeger (see sidebar for additional information) Minna Bluff, failed after only a few weeks of opera- of the Department of Meteorology at the University tion. Another system was installed at Cape Hallett of Wisconsin—Madison (UW-Madison) for analysis. to the north of McMurdo Station and operated for Professor Charles Stearns and his graduate student approximately 5 months (M. Gibbs 2007, personal George Weidner were asked to digitize the strip charts communication). Other XB-1 systems were likely because they had been doing this for strip charts from installed during the mid to late 1960s. In the heart recording AWS units in Wisconsin. Stearns’s recom- of the atomic age, one of the XB-2 PAWS was pow- mendation was to move to recording data on computer ered by a radioisotope thermoelectric generator compatible paper tape to be punched by the AWS. (RTG) and designated XB-2N. The RTGs were built by Martin Marietta and specifically called System The Stanford AWS. At the same time the recording for Nuclear Auxiliary Power (SNAP-7C). The first AWS was operating at the Cordiner Peaks, Stanford XB-2N system was installed at Minna Bluff, just University’s Center for Radio Astronomy, under the to the south of McMurdo Station, Antarctica, on 7 direction of Dr. A. Peterson and Dr. M. Sites, with February 1962. funding from the National Science Foundation (NSF), was developing a prototype AWS that would transmit data to the polar-orbiting Nimbus-6 satellite. The ini- tial deployment of this prototype AWS to Antarctica AFFILIATIONS: LAZZARA—Antarctic Meteorological Research Center, Space Science and Engineering Center, University of in 1975 was to test the cold weather capability of the Wisconsin—Madison, Madison, Wisconsin; WEIDNER AND KELLER— electronics and the various sensors selected to mea- Department of Atmospheric and Oceanic Sciences, University sure temperature, air pressure, wind speed, and wind of Wisconsin—Madison, Madison, Wisconsin; THOM—Antarctic direction. Similar to the XB-2N PAWS of the 1960s, Meteorological Research Center, Space Science and Engineering an RTG powered the prototype station. Center, and Department of Atmospheric and Oceanic Sciences, This prototype Stanford AWS was initially deployed University of Wisconsin—Madison, Madison, Wisconsin; at the South Pole in February 1975. In December 1975, CASSANO—Cooperative Institute for Research in Environmental the AWS was moved to McMurdo Station and then Sciences, and Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, Colorado moved to Marble Point in January 1976. It operated CORRESPONDING AUTHOR: Matthew A. Lazzara, Antarctic there until May 1977. With the somewhat success- Meteorological Research Center, Space Science and Engineering ful operation of the prototype, the Center for Radar Center, University of Wisconsin—Madison, 1225 West Dayton Astronomy at Stanford University was awarded a grant Street, Madison, WI 53706 from NSF in December 1977 for the manufacture of E-mail: [email protected] six additional AWS, which were deployed during the The abstract for this article can be found in this issue, following the 1978/79 field season in the area around McMurdo table of contents. Station and at Byrd Surface Camp. Sensors on this DOI:10.1175 / BAMS - D -11- 0 0 015.1 version of the AWS consisted of a Weed platinum A supplement to this article is available online (10.1175 / BAMS - D -11- 0 0 015.2) resistance thermometer (PRT) for external and In final form 19 March 2012 internal temperatures, a Paroscientific Model 215A ©2012 American Meteorological Society barometer for pressure, and the Bendix Aerovane Model 120 for the wind speed and wind direction. 1520 | OCTOBER 2012 Unauthenticated | Downloaded 09/26/21 10:04 PM UTC One AWS was equipped to measure humidity using a AWSs, and additional AWS units were deployed by Vaisala HMP-14U humidity probe. Renard and Salinas Stanford personnel, including one at Dome C. Four (1977) give an analysis of this AWS. of the units were to be installed along a traverse route The Argos satellite system was developed in 1978 between Dumont D’Urville and Dome C and would by the Centre National d’Etudes Spatiales (CNES), use batteries instead of the RTG. By the end of the the National Aeronautics and Space Administration field season, only two of the four had been installed (NASA), and the National Oceanic and Atmospheric at sites along the Adélie Coast, D-10 and D-17. Only Administration (NOAA) (see www.argos-system the Argos AWS units installed at Byrd, Dome C, .org) to facilitate the transfer of meteorological and and Marble Point operated through the 1980 austral oceanographic data around the world. The Argos winter. capabilities were a large improvement over the data transfer system used by the initial Stanford ANTARCTIC AWS PROGRAM AT UW- prototype AWS, so the AWSs were redesigned by MADISON (1980–2010). 1980s. Given the many Stanford to transmit data via the Argos system on the frustrations associated with attempting to work in Television and Infrared Observation Satellite series N the Antarctic, it is perhaps understandable that, (TIROS-N)/NOAA series of satellites. The data were after designing a pioneering AWS, Stanford sought transmitted once every 200 s. to transfer maintenance of the AWS network to During the 1979/80 Antarctic field season, the another entity. In 1979, Stearns submitted a proposal Nimbus AWSs were converted to the Argos-based to NSF that transferred the Antarctic AWS program DR. CHARLES R. STEARNS' ROLE IN THE DEVELOPMENT OF THE AWS NETWORK n the late 1970s, Professor Werner Stearns was ahead of his time with his ISchwerdtfeger, an avid Antarctic open data-sharing policy. Long before researcher, introduced the Antarctic to it was a standard practice, he freely a colleague at UW-Madison, Professor shared his AWS observations, often Charles Stearns (Fig. SB1). Stearns was in real time. Seeing so many other already very active in developing and scientists benefit from the observations setting up instrumentation for meteo- made by the network was a great rological experiments in Wisconsin and satisfaction for Stearns. other locations. Schwerdtfeger asked In 1982, Stearns was awarded his colleague to help in the digitization the Antarctic Service Medal by the of the strip chart recorded in National Science Foundation for his Antarctica at Cordiner AWS site given scientific achievement under the USAP. Prof. Stearns’s existing expertise with His commitment to the community strip chart digitization. This request was seen in his service to the AMS as ultimately led Stearns to become the he served on the AMS Committee on steward of the USAP AWS network. Polar Meteorology and Oceanography Stearns’s experience and efforts from 1986 to 1988, and was program FIG SB1. Professor Charles R. with AWS systems led to the chair of the Second Conference on Stearns (1925–2010). expansion of weather stations around Polar Meteorology and Oceanography. the Antarctic. He often devised Stearns served on the NSF Committee creative solutions to the challenges in on Antarctic Operations and to 2008, his longest-running project. maintaining the network. For example, Engineering from 1996 to 2003. He was He deployed to Antarctica for 18 field once an AWS site was installed on the elected a fellow of the AMS in 2004. seasons. This program oversaw the ice shelf, it became a challenge to get On 12 July 2010, he was posthumously first large-scale meteorological instru- back to the site in subsequent seasons.
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