Syed Moosa Ali

SAC, ISRO · Marine Ecosystem Divison

In ocean colour remote sensing, radiance at the sensor level can be modeled using molecular scattering and particle scattering based on existing mathematical models and gaseous absorption in the atmosphere. The modulation of light field by optical constituents within the seawater waters results in the spectral variation of water leaving radiances t...

The filamentous marine cyanobacterium Trichodesmium forms extensive blooms in tropical seas, where it plays an important role in nitrogen fixation. This study investigated Trichodesmium-associated phytoplankton in the Eastern Arabian Sea (EAS) during bloom and nonbloom conditions. Trichodesmium blooms over the continental shelf primarily comprised...

This study presents a comprehensive analysis of phytoplankton diversity and optical properties in the coastal waters of Ratnagiri, India. Ratnagiri, located on the southern coast of Maharashtra, is one of the major centre for fishing activities in India as well as a developing hub for industrial activities. Given its ecological significance and the...

Ocean colour spectral observations play a significant contribution in mapping the earth marine resources through measurements with its inverted geo-physical/biophysical parameters. The retrieval of parameters from the basic sensor measurements highly depends on atmospheric scattering and absorption of light energy by its constituents. Hence the qua...

This study presents a comprehensive analysis of phytoplankton diversity and optical properties in the coastal waters of Ratnagiri, India. Ratnagiri, located on the southern coast of Maharashtra, is one of the major centre for fishing activities in India as well as a developing hub for industrial activities. Given its ecological significance and the...

Arabian Sea is one of the productive basin of northern Indian Ocean region and experiences strong seasonality in terms of biological productivity. It has two high productive seasons i.e. winter season (December-March) and summer season (June-September) with two low productive inter-monsoon seasons (October-November) and (April-May) respectively. Ph...

Chilika Lake is an optically complex water body experiencing circulations linked to the tidal influx from Bay of Bengal. These circulations causes seasonal variations in biophysical and chemical parameters of the lake, such as water nutrients, salinity and chlorophyll-a (Chl-a). In this study, bio-optical parameters (Chl-a concentration, absorption...

p>Ocean colour spectral observations play a significant contribution in mapping the earth marine resources through measurements with its inverted geo-physical/bio-physical parameters.The retrieval of parameters from the basic sensor measurements highly depend on atmospheric scattering and absorption of light energy by its constituents. Hence the qu...

Arabian Sea (AS) experiences Chlorophyll-a (Chl-a) blooms during winter and early spring (November-March) mainly due to the changes induced by seasonally reversing monsoon winds and associated processes. The seasonal blooms exhibit distinct regional patterns in their onset, duration, intensity and peak period. Recent changes in ocean dynamics and p...

SAtellite-based Marine Process Understanding, Development, Research and Applications (SAMUDRA) for blue economy, a technology development program of the Space Applications Centre, is an umbrella program covering research and applications geared toward physical and biological oceanography making use of current and future satellite observations for d...

SAtellite-based Marine Process Understanding, Development, Research and Applications (SAMUDRA) for blue economy, a technology development program of the Space Applications Centre, is an umbrella program covering research and applications geared toward physical and biological oceanography making use of current and future satellite observations for d...

Chromophoric Dissolved Organic Matter (CDOM) is the fraction of dissolved organic matter that absorbs sun light in ultra-violet and visible region of the electromagnetic radiation. CDOM is abundantly found in marine and coastal waters and is very important to studying optical properties of water columns and biogeochemistry of the water. It is...

Phytoplankton is the principal component of the ocean ecosystem, whose biomass (represented as total chlorophyll-a (Chl-a) concentration) and size structure are the key ecological indicators. With an aim to retrieve phytoplankton size class (PSC) in Arabian Sea (a region with limited measurements), this study focuses on modification of two existing...

In the current paper, sun glint simulation at different payload tilts has been carried out in order to investigate the variability of sun glint-affected area with change of tilt using OCM-2 data. The simulations were performed for tilts varying from 0 to 200 at 50 increments. It was observed that the sun glint-affected area moved towards higher lat...

In this study, bio-optical parameters were derived from hyperspectral data of optically complex waters using spectrum matching technique (SMT). Models for inherent optical properties (IOPs) of the water column were tuned using in-situ dataset from the study area (i.e., Chilika lagoon). Constructed IOPs were used to simulate remote sensing reflectan...

Ocean color remote sensing deals with the modulation of incident light by bio-optically active constituents present in the water column through the process of absorption and backscattering. The challenging task is to find out different approaches for exploiting water-leaving radiance measured from ocean color sensors to infer the absorption, scatte...

A new conceptual framework, based on ocean bio-physical observations from different satellites, has been proposed to track fishing ground parameters to identify Potential Fishing Zones (PFZ) in the Bay of Bengal (BoB). The proposed technique also attempts to provide a short-term forecast based on feature propagation, even under cloudy conditions. T...

Coloured dissolved and detrital matter (CDM) forms a significant fraction of the total dissolved organic matter (DOM) in water bodies. It absorbs light strongly in the ultraviolet and blue domains of the electromagnetic spectrum. The present study maps CDM absorption of the entire Chilika lagoon, Odisha, India (an optically complex water body) usin...

This study describes the optical complexity of Chilika lake, and the potential use of ocean colour data like Oceansat 2 OCM/ SUOMI-VIIRS for continuous monitoring of the biooptical properties. First part of this study involves retrieval of remote sensing reflectance (Rrs) over Chilika lake from satellite measured top of atmosphere (TOA) radiance. S...

India has a long coastline of around 7500 kms and fishery is one of the major industries in coastal regions of India employing around 14 million people. The ocean colour remote sensing plays a vital role in fishery applications. Bio-optical parameters like chlorophyll-a (Chl-a), coloured dissolved organic matter (CDOM) and particle backscattering (...

A regionally tuned three component “abundance” model of Brewin et al. (2012) has been used to discriminate satellite ocean color derived fields of phytoplankton biomass observable as Chlorophyll-a (Chl-a), into three size classes, i.e. microplankton (> 20 μm), nanoplankton (> 2 to < 20 μm) and picoplankton (< 2 μm). The model has been applied to MO...

Chilika Lake is a largest brackish water lagoon in the Asian continent and is a very good site for studying case-3 waters from satellite data. The bio optical characterization of the lagoon and its continuous monitoring is possible with the help of Ocean color Remote Sensing satellites like Oceansat-2 OCM and MODIS as well as with the help of Lands...

Phytoplankton plays an important role in upper oceanic and atmospheric processes. The estimation of phytoplankton biomass from space borne platforms plays a vital role in studying their spatial and temporal variations. Phytoplankton biomass indexed as chlorophyll-a concentration from space is estimated from the optical properties of the ocean water...