The NPI was selected as the single most appropriate index for characterizing the climate forcing of the Bering Sea. The NPI is a measure of the strength of the Aleutian Low, specifically the area-weighted sea level pressure (SLP) for the region of 30o to 65oN, 160oE to 140oW (Trenberth and Hurrell, 1994). It is relevant to the Bering Sea because the strength of the Aleutian Low relates to wintertime temperatures, with a deeper low (negative SLP anomalies) associated with a greater preponderance of maritime air masses and hence warmer conditions.
Download .csv| Dataset: | North Pacific Index |
| Region: | North Pacific |
| Source: | http://www.beringclimate.noaa.gov/data/ |
| Year | Index |
| 1961 | 1006.868 |
| 1962 | 1010.684 |
| 1963 | 1007.466 |
| 1964 | 1009.076 |
| 1965 | 1009.884 |
| 1966 | 1011.274 |
| 1967 | 1010.958 |
| 1968 | 1009.018 |
| 1969 | 1010.83 |
| 1970 | 1005.734 |
| 1971 | 1011.482 |
| 1972 | 1011.836 |
| 1973 | 1009.514 |
| 1974 | 1009.06 |
| 1975 | 1010.026 |
| 1976 | 1010.094 |
| 1977 | 1005.954 |
| 1978 | 1006.492 |
| 1979 | 1010.552 |
| 1980 | 1007.686 |
| 1981 | 1004.438 |
| 1982 | 1010.602 |
| 1983 | 1003.46 |
| 1984 | 1006.28 |
| 1985 | 1010.006 |
| 1986 | 1004.794 |
| 1987 | 1005.968 |
| 1988 | 1008.134 |
| 1989 | 1011.742 |
| 1990 | 1010.906 |
| 1991 | 1011.244 |
| 1992 | 1006.456 |
| 1993 | 1008.754 |
| 1994 | 1010.356 |
| 1995 | 1008.562 |
| 1996 | 1007.772 |
| 1997 | 1008.67 |
| 1998 | 1005.478 |
| 1999 | 1009.446 |
| 2000 | 1008.446 |
| 2001 | 1007.084 |
| 2002 | 1009.196 |
| 2003 | 1005.066 |
| 2004 | 1008.564 |
| 2005 | 1008.15 |
| 2006 | 1010.108 |
| 2007 | 1009.826 |
| 2008 | 1009.304 |
| 2009 | 1013.466 |
| 2010 | 1006.49 |
| 2011 | 1011.132 |
| 2012 | 1010.324 |
| 2013 | 1010.312 |
| 2014 | 1009.804 |
| 2015 | 1007.862 |
| 2016 | 1006.588 |
| 2017 | 1010.256 |
| 2018 | 1012.978 |
| 2019 | 1009.398 |
| 2020 | 1011.762 |
| 2021 | 1010.636 |
| 2022 | 1010.524 |
| 2023 | 1011.92 |