Marouan Bouali

Marouan Bouali
Instituto Oceanográfico da Universidade de São Paulo · Laboratório de Oceanografia por Satélites

PhD

About

20
Publications
5,175
Reads
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369
Citations
Additional affiliations
September 2011 - March 2014
National Oceanic and Atmospheric Administration
Position
  • Research Scientist
September 2011 - March 2014
Colorado State University
Position
  • Research Scientist

Publications

Publications (20)
Article
Full-text available
Images acquired by the Moderate Resolution Imaging Spectroradiometer (MODIS) aboard Terra and Aqua exhibit strong detector striping. This artifact is common to most pushbroom scanners and affects both visual interpretation and radiometric integrity of remotely sensed data. A considerable effort has been made to remove stripe noise and reduce its im...
Article
The Suomi National Polar-Orbiting Partnership (S-NPP) satellite was successfully launched on 28 October 2011. It carries five new-generation instruments, including the Visible Infrared Imaging Radiometer Suite (VIIRS). The VIIRS is a whiskbroom radiometer that scans the surface of the earth using a rotating telescope assembly, a double-sided half-a...
Article
In this study, we investigate the spatial and temporal characteristics of Sea Surface Temperature (SST) gradients in the South Atlantic Ocean (SAO) using satellite data. 12 years (2003–2014) of high resolution synoptic SST images acquired from NASA's MODIS instrument onboard Terra and Aqua platforms were processed to mitigate quality issues related...
Article
Ongoing efforts are dedicated by meteorological and oceanographic agencies to improve the accuracy of Sea Surface Temperature (SST) estimates from satellite observations via improved retrieval algorithms and validation data. An important application of satellite-based SST observations is the analysis of the spatio-temporal characteristics of ocean...
Article
Full-text available
Traditional ways of validating satellite-derived sea surface temperature (SST) and sea surface salinity (SSS) products by comparing with buoy measurements, do not allow for evaluating the impact of mesoscale-to-submesoscale variability. We present the validation of remotely sensed SST and SSS data against the unmanned surface vehicle (USV)—called S...
Article
Full-text available
The Arctic Ocean is one of the most important and challenging regions to observe—it experiences the largest changes from climate warming, and at the same time is one of the most difficult to sample because of sea ice and extreme cold temperatures. Two NASA-sponsored deployments of the Saildrone vehicle provided a unique opportunity for validating s...
Article
Cloud masking is a critical step in the estimation of Sea Surface Temperature (SST) from satellite observations. It can affect the validation statistics of SST on synoptic scales but also on long-term climatologies. One of the main challenges in cloud masking is the discrimination between clouds and ocean sharp fronts as both of these are associate...
Conference Paper
Satellite imagery provides information crucial for remote sensing applications. However, the images themselves can suffer from systematic and random artefacts which reduce the utility and accuracy of datasets. In particular, radiometric miscalibration due to temporal variation of the detector response may result in stripe noise. We report a method...
Article
Full-text available
Validation of satellite-based retrieval of ocean parameters like Sea Surface Temperature (SST) and Sea Surface Salinity (SSS) is commonly done via statistical comparison with in situ measurements. Because in situ observations derived from coastal/tropical moored buoys and Argo floats are only representatives of one specific geographical point, they...
Article
Satellite-derived sea surface temperature (SST) presents discrepancies in both magnitude and temporal variability in the wind-driven coastal upwelling region off the Cape Frio (23°S) in Southeastern Brazil. Level 2 (L2) data from the Moderate Resolution Imaging Spectroradiometer (MODIS) Terra and Aqua, and Level 4 (L4) SST products are compared wit...
Article
Full-text available
Sea surface temperature (SST) is a fundamental physical variable for understanding, quantifying and predicting complex interactions between the ocean and the atmosphere. Such processes determine how heat from the sun is redistributed across the global oceans, directly impacting large- and small-scale weather and climate patterns. The provision of d...
Preprint
Full-text available
Traditional ways of validating satellite-derived sea surface temperature (SST) and sea surface salinity (SSS) products by comparing with buoy measurements, do not allow for evaluating the impact of mesoscale-to-submesoscale variability. We present the validation of remotely sensed SST and SSS data against the unmanned surface vehicle (USV)—called S...
Article
Full-text available
High-resolution satellite imagery is a valuable data source to analyse ocean submesoscale dynamics (i.e., with spatial scales of the order of 1-10 km) and investigate their impact on turbulent mixing, energetics of mesoscale vortices, instability processes or phytoplankton blooms. However, data acquired by satellite sensors often suffer from instru...
Article
Full-text available
Radiometric performance of MODIS and VIIRS sensors is superior to that of the AVHRR, thanks to improved design and implementation of stringent pre-launch sensor characterization efforts and in-flight monitoring practices. Nevertheless, the imagery of the measured brightness temperatures (BT) and derived sea surface temperatures (SST) from multi-det...
Article
While modern multi-detector sensors offer a much improved image resolution and signal-to-noise ratio among other performance benefits, the multi-detector arrangement gives rise to striping in satellite imagery due to various sources, which cannot be perfectly corrected by sensor calibration. Recently, Bouali and Ignatov (2014) [J. Atmos. Oceanic Te...
Conference Paper
Full-text available
Joint Polar Satellite System (JPSS) is a follow-on mission to the NOAA Polar Orbiting Environmental Satellites (POES). The first JPSS satellite, the Suomi National Polar-orbiting Partnership (S-NPP) was launched in October 2011 with the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard. NOAA is responsible for the JPSS mission and correspon...
Conference Paper
Errors in the radiometric calibration of detectors introduce stripe noise in the images captured by multidetector spectroradiometers. Consequently, native resolution sea surface temperature (SST) maps derived from these instruments often display pronounced striping which reduces the accuracy of the data and its usefulness for low-level processing t...
Article
The combination of multiple detectors and a double-sided mirror in the Moderate Resolution Imaging Spectroradiometer (MODIS) introduces striping in the imagery despite the use of onboard calibration systems. This results in a sharp unidirectional pattern across scan lines and leads to significant radiometric uncertainties in level-1 radiances, whic...
Conference Paper
Following successful launch of NPP satellite in October 2011, the VIIRS instrument started delivering high quality radiances from which improved Sea Surface Temperature (SST) products are generated. The design of VIIRS instrument is similar to the MODIS sensor, which includes a double sided mirror reflecting the Earth's radiance to 10 individual de...
Conference Paper
The Moderate Resolution Imaging Spectrometer (MODIS) monitors the earth in 36 spectral bands using a cross-track double-sided continuously rotating scan mirror. The imperfect calibration of the linear arrays of detectors and additional random noise in the internal calibration system induce detector-to-detector stripes, mirror side stripes and noisy...

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