Accession Number:

ADA610738

Title:

Estimation of the Barrier Layer Thickness in the Indian Ocean Using Aquarius Salinity

Descriptive Note:

Journal article

Corporate Author:

NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV

Report Date:

2014-07-08

Pagination or Media Count:

16.0

Abstract:

Monthly barrier layer thickness BLT estimates are derived from satellite measurements using a multilinear regression model MRM within the Indian Ocean. Sea surface salinity SSS from the recently launched Soil Moisture and Ocean Salinity SMOS and Aquarius SAC-D salinity missions are utilized to estimate the BLT. The MRM relates BLT to sea surface salinity SSS, sea surface temperature SST, and sea surface height anomalies SSHA. Three regions where the BLT variability is most rigorous are selected to evaluate the performance of the MRM for 2012 the Southeast Arabian Sea SEAS, Bay of Bengal BoB, and Eastern Equatorial Indian Ocean EEIO. The MRM derived BLT estimates are compared to gridded Argo and Hybrid Coordinate Ocean Model HYCOM BLTs. It is shown that different mechanisms are important for sustaining the BLT variability in each of the selected regions. Sensitivity tests show that SSS is the primary driver of the BLT within the MRM. Results suggest that salinity measurements obtained from Aquarius and SMOS can be useful for tracking and predicting the BLT in the Indian Ocean. Largest MRM errors occur along coastlines and near islands where land contamination skews the satellite SSS retrievals. The BLT evolution during 2012, as well as the advantages and disadvantages of the current model are discussed. BLT estimations using HYCOM simulations display large errors that are related to model layer structure and the selected BLT methodology.

Subject Categories:

  • Physical Chemistry
  • Cybernetics
  • Structural Engineering and Building Technology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE