Infrared Sensor Information in Ocean Remote Sensing

Infrared (IR) sensors detect electromagnetic radiation emitted by the Earth's surface. The intensity of this radiation is directly related to the object's temperature.

In ocean remote sensing, IR sensors are primarily used to measure sea surface temperature (SST). They capture the thermal infrared energy emitted by the top layer of the ocean, providing valuable data about ocean currents, climate patterns, and marine ecosystems.

Why Other Options Are Incorrect

• Sea surface wind: Wind speed and direction at the surface are typically measured using microwave sensors like scatterometers, which are sensitive to surface roughness caused by wind.
• Sea surface salinity: Salinity measurements usually rely on microwave radiometers or conductivity sensors, as salinity affects the dielectric constant and conductivity of seawater.
• Chlorophyll pigment concentration: This is measured using optical sensors operating in the visible and near-infrared spectrum. Chlorophyll absorbs specific wavelengths of light and reflects others, allowing its concentration to be estimated.

Therefore, the main information provided by infrared sensors in ocean remote sensing is the sea surface temperature.