+ Translate

Spectral analysis of spatial series of oceanographic variables

, : Spectral analysis of spatial series of oceanographic variables. Journal of Experimental Marine Biology and Ecology 30(2): 147-164

Time series of fluorescence, temperature, concentration of nitrite, and of nitrate + nitrite, obtained in the upwelling zone off northwest Africa, were analyzed by power spectral techniques, after application of a first difference filter. In 3 runs, coherence between fluorescence and temperature was significant at all frequencies lower than 0.04-0.13 cycles/min; in another 3 runs, coherences showed a drop at low frequencies. Coherences between the remaining pairs of variables were significant at the lower frequencies studied in most cases. Significant coherences between nitrate + nitrite and temperature were found at wider frequency ranges than for fluorescence and temperature. Nitrite showed higher coherences with fluorescence and lower ones with temperature than nitrate + nitrite, as would be expected from the involvement of phytoplankton in the production of nitrite. Some points concerning coherence between fluorescence and physical variables, as represented by temperature, are discussed.

Accession: 006459438

DOI: 10.1016/0022-0981(77)90009-0

Download PDF Full Text: Spectral analysis of spatial series of oceanographic variables

Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Related references

Brenes, CL.; Hernandez, A.; Campos, J., 2000: Spatial distribution of fish captures in the Pacific of Nicaragua and its relationship with several oceanographic variables Distribucion espacial de capturas de tiburon en la pacifico nicaraguense y su relacion con algunas variables oceanograficas. Revista de Biologia Tropical. June-September; 482-3: 399-411

Brenes, C.L.; Hernandez, A.; Campos, J., 2000: Spatial distribution of fish captures in the Pacific of Nicaragua and its relationship with several oceanographic variables. Revista de Biologia Tropical 48.2-3 (June-September): 399-411

Brenes, C.L.; Hernández, A.; Campos, J., 2001: Spatial distribution of sharks captures in the Pacific of Nicaragua and its relationship with several oceanographic variables. Between August 1995 and August 1997 long line fishing techniques and a bathythermograph were used to correlate some physical variables with the spatial distribution of four shark species in 26 fishing cruises off the Nicaraguan Pacific Coast. They...

Ralston, Stephen., 1995: The influence of oceanographic variables on time series of otolith growth in pelagic young-of-the-year rockfish, Sebastes spp. Belle W. Baruch Library in Marine Science, 19: 97-118

Guinet, C.; Dubroca, L.; Lea,; Goldsworthy, S.; Cherel, Y.; Duhamel, G.; Bonadonna, F.; Donnay, J.P.ul, 2001: Spatial distribution of foraging in female Antarctic fur seals Arctocephalus gazella in relation to oceanographic variables: A scale-dependent approach using geographic information systems. The distribution of foraging activity for female Antarctic fur seals was investigated at Cap Noir (49degree 07' S, 70degree 45' E), Kerguelen Island in February 1998. Eleven females were fitted with a satellite transmitter and time-depth...

Costa, O.; Lago, P.; Rocha, A.P.; Freitas, J.; Puig, J.; Carvalho, M.J.; de Freitas, A.F., 1995: The spectral analysis of heart rate variability. A comparative study between nonparametric and parametric spectral analysis in short series. to compare parametric (AR) and non parametric (FFT) spectral analysis results obtained in 512 beats series. 104 healthy subjects with normal physical examination and electrocardiogram were studied. The Ecg was recorded at rest, with controlled bre...

Gulli, G.; Wight, V.L.; Hainsworth, R.; Cevese, A., 2001: Spectral and cross-spectral autoregressive analysis of cardiovascular variables in subjects with different degrees of orthostatic tolerance. The mechanisms leading to vasovagal syncope are still unclear. A simple discriminating test for the identification of syncope-prone subjects is not presently available. Fifty-two subjects had a stepwise orthostatic test with 60 degrees tilt and -2...

Intergovernmental Oceanographic Commission, 1967: Manual on international oceanographic data exchange inter governmental oceanographic commission technical series no 4. Intergovernmental Oceanographic Commission Technical Series:

Gregory J.M.Dermid; Steven E.F.anklin, 1994: Spectral, spatial, and geomorphometric variables for the remote sensing of slope processes. A combined spectral, spatial, and geomorphometric variable set was used to separate geomorphic surfaces at three scales, corresponding roughly to process domain (level I), landform (level II), and sublandform (level III). The best results were obt...

Treitz, P.; Howarth, P., 2000: Integrating spectral, spatial, and terrain variables for forest ecosystem classification. Sets of spectral, spectral-spatial, textural, and geomorphometric variables derived from high spatial resolution Compact Airborne Spectrographic Imager (CASI, a visible/near-infrared pushbroom imaging spectrograph) and elevation data were tested t...