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Estimation of sea surface temperature (SST) using marine seismic data

DRS at CSIR-National Institute of Oceanography

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Title Estimation of sea surface temperature (SST) using marine seismic data
 
Creator Sinha, S.K.
Dewangan, P.
Sain, K.
 
Subject METEOROLOGY AND CLIMATOLOGY
METEOROLOGY AND CLIMATOLOGY
GEOLOGY AND GEOPHYSICS
OCEANOGRAPHY AND LIMNOLOGY
OCEANOGRAPHY AND LIMNOLOGY
 
Description Not much attention is given to direct wave arrivals in marine seismic data that are acquired for petroleum exploration and prospecting. These direct arrivals are usually muted out in routine seismic data processing. In the present study, we process these direct arrivals to accurately estimate soundspeed in near-surface seawater and invert for sea surface temperature. The established empirical equation describing the relationships among temperature, salinity, pressure and soundspeed is used for the inversion. We also discuss processing techniques, such as first-break picking and cross-correlation for the estimation of soundspeed, that are well known among petroleum-industry geophysicists. The accuracy of the methods is directly linked to the data quality and signal processing. The novelty in our approach is in the data conditioning, which consists essentially of spectral balancing based on a wavelet transform that compensates for spherical spreading and increases the signal-to-noise (S/N) ratio. The 2D seismic data used in this paper are from the offshore Krishna-Godavari Basin east of India. We observe a significantly higher soundspeed of 1545 m/s for near-surface water than the commonly used value of ~1500 m/s. The estimated temperature (from velocity) is about 30 °C. Interestingly, the estimated temperature matches well with the temperature recorded in the CTD profile acquired in the study area during the month of May, the month corresponding to the acquisition of seismic data. Furthermore, the estimated temperatures during different times of data acquisition correlate well with the expected diurnal variation in temperature
 
Date 2016-05-12T12:43:54Z
2016-05-12T12:43:54Z
2016
 
Type Journal Article
 
Identifier Pure and Applied Geophysics, vol.173(4); 2016; 1305-1316
http://drs.nio.org/drs/handle/2264/4969
 
Language en
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2015] Springer
 
Publisher Springer