Tropical Western Pacific
Manus, Papua New Guinea: 2° 3' 39.64" S, 147° 25' 31.43" E
Nauru Island: 0° 31' 15.6" S, 166° 54' 57.60" E
Darwin, Australia: 12° 25' 28.56" S, 130° 53' 29.75" E
![TWP](https://webarchive.library.unt.edu/web/20090814085253im_/http://www.arm.gov/images/twp_front.jpg)
The Tropical Western Pacific (TWP) locale was established in 1996 as the second ARM Climate Research Facility site. Operated by the Tropical Western Pacific Office (TWPO) at Los Alamos National Laboratory, the TWP site consists of three climate research facilities: the Manus facility on Los Negros Island in Manus, Papua New Guinea (established in 1996); the Nauru facility on Nauru Island, Republic of Nauru (1998); and the Darwin facility in Darwin, Northern Territory, Australia (2002). The operations are supported by government agencies in each host country.
Covering the area roughly between 10° N and 10° S of the equator and from 130° E to 167° E, the TWP locale includes a region that plays a large role in the interannual variability observed in the global climate system. For example, a phenomenon called the El Niño/Southern Oscillation, or ENSO, has far-reaching implications for weather patterns over much of the Northern Hemisphere and perhaps the entire planet.