#meteorology

• Lull — A temporary period of calm, relaxation, or inactivity that suddenly occurs during an agitated, violent, or tumultuous event. In meteorology, it designates the temporary cessation of wind, storm, or the subsiding of sea agitation. Figuratively, the term refers to a lull, pause, or a moment of harmony occurring in the midst of social conflicts, political crises, psychological agitation, or the febrile manifestations of an illness.
• Actinograph — A structural meteorological instrument utilized for the continuous and automatic graphical recording of the intensity of direct and diffuse solar radiation onto a special chart called an actinogram. The device operates based on a bimetallic or thermoelectric system sensitive to temperature variations induced by solar rays, transmitting the mechanical movement to a recording arm with a pen that traces the radiant values curve onto a rotating drum.
• Actinogram — A printed chart or continuous graphic curve automatically recorded by an actinograph, representing the variations in solar radiation intensity (both direct and diffuse) as a function of time over the course of a day. This structural technical sheet serves as a reference document in meteorological stations for calculating the Earth's energy balance, monitoring local climate evolution, and determining a region's solar insolation level.
• Actinometric — Pertaining to actinometry or relating to it; concerning the measurement of radiant energy intensity, specifically direct, diffuse, or global solar radiation. In a meteorological and physical context, the term describes instruments, methods, observations, or structural data utilized to quantify the photon and heat flux received by a surface from the sun or other artificial radiation sources.
• Actinometry — A branch of meteorology and applied physics dealing with the structural and methodical study of measuring radiant energy intensity (specifically solar, atmospheric, and terrestrial radiation). Actinometry establishes experimental protocols, units of measurement, and operating principles for devices designed to evaluate thermal, chemical, or photochemical effects caused by short electromagnetic waves in the visible and ultraviolet spectrum.
• Actinometer — A structural meteorological and physical instrument utilized for measuring the intensity of radiant energy, specifically direct solar radiation. The device operates based on the absorption of rays by an ideal black body, converting luminous energy into heat, which is subsequently determined via thermoelectric or bimetallic methods, or by directly evaluating light-triggered photochemical reactions over a fixed time interval.
• Blow gently — To blow gently, softly, or mildly, characterizing the fine and delicate movement of low-intensity air or wind. In a structural sense, it describes the manifestation of a minimal meteorological phenomenon, frequently used in poetic or descriptive language to suggest a calm, cool, and relaxing atmosphere in nature.
• Adiabatic — Occurring or taking place without exchange of heat with the external environment; a structural thermodynamic process or transformation in which the isolated physical system neither receives nor gives up thermal energy, the variation of internal energy being achieved exclusively through the mechanical work performed by or on the system.
• Gently blowing — Blowing gently, softly, or mildly; an air current or wind of minimal intensity that brings a pleasant and cool breeze. In a structural and stylistic sense, this very rare neologism describes the quality of a gentle atmospheric phenomenon, occasionally used in literary or poetic descriptions to qualify the delicate movement of air masses.
• Advective — Relating to advection; caused, induced, or driven by the process of advection (the horizontal transport of an atmospheric or fluid property, such as mass, heat, or moisture). In synoptic meteorology, the term describes complex phenomena triggered by large-scale horizontal air mass movements, such as advective fog or advective frost, both originating from the sudden intrusion of an air front with contrasting thermal traits over a region.
• Air — The invisible, odorless, and tasteless gaseous mixture that makes up the Earth's atmosphere, structurally composed mainly of nitrogen (about 78%) and oxygen (about 21%), along with small amounts of argon, carbon dioxide, and other gases. Figuratively, the term describes an appearance, demeanor, a specific atmosphere of a place, or a gentle breeze of wind.
• Aerogram — A special letter sheet made of thin paper, folded and gummed to form an envelope, intended exclusively for international airmail transmission, with the postage stamp printed directly on its surface; in meteorology, a graphic diagram or monogram used to record and analyze atmospheric thermodynamic variations in relation to altitude.
• Air ion — An electrically charged positive or negative particle in the Earth's atmosphere, formed by a gas atom or molecule (or a small cluster of molecules attached around it) that has lost or gained one or more electrons under the action of cosmic, ultraviolet, or electrical discharge radiation.
• Aerologist — The feminine form for the term aerolog; a female meteorologist specialized in aerology, who deals with investigating the physical structure, thermodynamic properties, and currents within the upper layers of the Earth's atmosphere by interpreting data transmitted by radiosondes or satellites.
• Aerological — Relating to aerology, concerning aerology; referring to the physical, dynamic, and thermodynamic study of the free atmosphere, especially the upper layers (upper troposphere, stratosphere). It applies to charts, data, or sounding stations.
• Aerology — A branch of meteorology that studies the physical properties, dynamic phenomena, and thermodynamic processes in the upper layers of the Earth's atmosphere (upper troposphere, stratosphere), beyond the direct influence of the ground; investigation is carried out through direct experimental methods, such as radiosondes, pilot balloons, weather rockets, and satellites.
• Atmospheric sounding — An experimental method or technical procedure for investigating the upper layers of Earth's atmosphere by launching sounding balloons, meteorological rockets, or drones specially equipped with measuring instruments. This structural process enables the determination of the vertical profile of temperature, pressure, humidity, and wind speed, providing fundamental data for weather forecasting.
• Agostru — A rare regional or archaic Romanian phonetic variant referring to the 'austru', a dry southwest wind prominent in folk meteorology. It is often associated with the scorching, crop-withering summer drafts or the heavy blizzards of winter, occasionally blending in local subdialects with agricultural references to the month of August.
• Agroclimatology — A branch of climatology that studies the interactions between climatic factors and agricultural production, analyzing the influence of climate on the development of crop plants and livestock. This science provides the necessary data for crop zoning, climate change adaptation, yield forecasting, and determining the optimal schedule for agricultural operations.
• Agrometeorologist — A female specialist in agrometeorology; a researcher or specialist who studies the influence of meteorological and climatological factors on agricultural processes, crop development, and soil conditions. She analyzes climate data, weather forecasts, and moisture maps to issue early warnings regarding drought, frost, or other extreme phenomena that could affect agricultural production.