Abstract
Two new time series techniques are employed to study the diurnal effect at between 30 and 60 metres depth in the upper equatorial ocean. A modified spectral approach is proposed to identify the period of an unequally spaced series. Based on the exceedances of mixing activities, a new criterion is introduced to identify local nights and days. These two techniques together provide a simple way to demonstrate the existence of the-diurnal cycle in deep stratified layers in the ocean. Instead of entertaining complicated models, the proposed approach suggests a simple way to identify the periodicity of an unequally spaced data set of this nature. Similar diurnal effects are detected in the analyses of a subsequent data set.
| Original language | English |
|---|---|
| Pages (from-to) | 235-244 |
| Journal | Environmetrics |
| Volume | 9 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - May 1998 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Research Keywords
- Diurnal cycles
- Exceedance
- Periodogram
- Time series
- Unequally spaced data
- Viscous dissipation rate