overflatetemperatur

Overflatetemperatur, or surface temperature, is the temperature of the outermost layer of a surface, such as soil, rock, vegetation, water, or the Earth's surface. It differs from near-surface air temperature, which is measured above the ground in the air rather than at the surface itself.

In meteorology and climatology, surface temperature often refers to land surface temperature (LST) or sea surface temperature (SST). LST measures the temperature of the topmost ground or vegetation layer, while SST refers to the upper layer of the ocean. These measurements complement air temperature data in understanding heat exchange between the surface and the atmosphere.

Factors affecting surface temperature include solar radiation, albedo, emissivity, heat capacity, moisture content, and surface roughness. Surfaces with high albedo reflect more sunlight and tend to stay cooler, while dark, moisture-rich surfaces can warm and cool rapidly depending on conditions such as time of day and weather.

Measurement approaches vary. Direct contact thermometers embedded in soil or placed on surfaces provide in-situ measurements. Infrared thermography and radiometers yield skin temperature, which represents the temperature of the surface itself. Satellites derive Land Surface Temperature by measuring thermal infrared radiance and applying atmospheric corrections, enabling global or regional monitoring.

Surface temperature is relevant beyond climate science, including agriculture, urban planning, and energy management. It influences evaporation, soil moisture, plant health, and microclimates, and it is a key variable in models of heat islands and weather dynamics.

Units are typically Celsius or Kelvin. Surface temperature can differ notably from air temperature, with daytime peaks often higher and nighttime values potentially lower depending on surface properties and conditions.