Relationship between atmospheric oscillation and wave climate in the western Pacific

LI Jing; ZHOU Lin; MA Weimin; Shi Jian; ZHANG Hanbin

doi:10.3969/j.issn.0253-4193.2013.05.006

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LI Jing, ZHOU Lin, MA Weimin, Shi Jian, ZHANG Hanbin. Relationship between atmospheric oscillation and wave climate in the western Pacific[J]. Haiyang Xuebao, 2013, 35(5): 59-66. doi: 10.3969/j.issn.0253-4193.2013.05.006

Citation:

LI Jing, ZHOU Lin, MA Weimin, Shi Jian, ZHANG Hanbin. Relationship between atmospheric oscillation and wave climate in the western Pacific[J]. Haiyang Xuebao, 2013, 35(5): 59-66. doi: 10.3969/j.issn.0253-4193.2013.05.006

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Relationship between atmospheric oscillation and wave climate in the western Pacific

doi: 10.3969/j.issn.0253-4193.2013.05.006

1.
Institute of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China;CSMTC, Jiangyin 214431, China
2.
Institute of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China
3.
CSMTC, Jiangyin 214431, China
4.
College of Atmospheric Science, NUIST, Nanjing 210044, China

Received Date: 2012-03-19

Abstract

Abstract

In this study the temporal and spatial correlations of atmospheric oscillation in terms of the SWH, the T and North Pacific Index(NPI), the Pacific Decadal Oscillation (PDO), and MEI in the western North Pacific (0°—45°N,99°—160°E) are investigated by using ERA-40 wave re-analysis data from 1958 to 2001, with a focus on impacts of the NPI on SWH and T. Results show that NPI, PDO and MEI are all closely related to SWH and T; NPI and SWH as well as T show a positive correlation, which is most evident around half a year in the east ocean of Japan and Philippines. NPI also shows inter-annual and decadal periodic variations of about 3-5 a, 8-9 a, and 13-15 a. High NPI and negative phase of PDO or MEI will lead to the increase of SWH and T. Cold phase of MEI and negative phase of PDO is also beneficial for the increase of SWH and T. The possible mechanisms through which NPI influences the wave climate in the western North Pacific are: When the NPI is low (high), Aleutian low will be deepened (weakened) and located more easterly (westerly). As a result, the jet stream in westerlies appears (disappears), the trade wind in western Pacific Ocean is weakened (strengthened), and wave height decreases (increases).
- western Pacific,
- wave climate,
- atmospheric oscillation,
- North Pacific Index

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