Characteristics of low-frequency components of the near-bottom current in the Chinese Pioneer Area

Two deep-sea moorings were deployed respectively in the east area and the west area of Chinese Pioneer Area (CPA) in the tropic east Pacific to monitor the regional deep-sea dynamics below 600 meters above bottom (mab) from July 1997 to Oct. 1999. Results of statistics, spectral estimate and correla...

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Bibliographic Details
Published in:Chinese science bulletin 2004-06, Vol.49 (11), p.1184-1189
Main Author: LIANG, Chujin
Format: Article
Language:English
Subjects:
Bottom currents
Correlation analysis
CPA
Deep sea
Deep sea environments
Frequency shift
Marine
Mooring
Sea currents
Statistical analysis
中国先进地区
低频流
低频组分
深海动力学
频率转移
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Summary:Two deep-sea moorings were deployed respectively in the east area and the west area of Chinese Pioneer Area (CPA) in the tropic east Pacific to monitor the regional deep-sea dynamics below 600 meters above bottom (mab) from July 1997 to Oct. 1999. Results of statistics, spectral estimate and correlation analysis of the low-passed velocity data show that time scales of low-frequency components of the near-bottom currents are 25~120 days, in which 51-day period dominates the lower band of the frequency domain. Topographic features have obvious effect on low-frequency currents below 50 mab; modulations of the bot-tom-intensified sheared mean flow to the low-frequency currents are the dynamic mechanism of the frequency shift that occurs in both the east-area and the west-area.
ISSN:1001-6538
2095-9273
1861-9541
2095-9281
DOI:10.1360/03wd0300