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| The Clouds | |
|---|---|
| Name | The Clouds |
| Caption | A composite depiction of cloud formations |
| Type | Atmospheric phenomenon |
| Epoch | Present |
| Discoverer | Ancient observers |
| Notable | Influential across meteorology, aviation, art, literature |
The Clouds
The Clouds are collections of suspended liquid droplets, frozen crystals, and aerosol particles in planetary atmospheres, visible as diffuse masses that modulate light from the Sun, Moon, and artificial sources. Across Earth and other planets, they intersect studies of Aristotle, Luke Howard, James Glaisher, Gilbert Walker, Carl-Gustaf Rossby, and institutions such as the Royal Meteorological Society, NOAA, NASA and European Space Agency while inspiring works by John Constable, Claude Monet, William Wordsworth, Percy Bysshe Shelley and Aristophanes.
Clouds form when atmospheric parcels cool and their vapor content reaches saturation, producing ensembles of droplets or crystals that scatter and absorb radiation from bodies like the Sun and Jupiter. Observations by expeditions associated with Captain James Cook, Lewis and Clark Expedition and scientific campaigns of International Geophysical Year underpinned systematic catalogues such as those initiated by Luke Howard and extended by Otto Knorr. Sensors aboard platforms including GOES, Metop, MODIS, TRMM and aircraft from Bureau of Meteorology (Australia) quantify cloud albedo, optical depth, and microphysics, informing operational centers like ECMWF and NCEP.
Pre-scientific classifications appear in accounts from Aristotle and maritime logs of Ptolemy; formal taxonomy emerged with the 19th-century essay by Luke Howard and contemporaneous work by Alexander von Humboldt and John Dalton. Balloon ascents by James Glaisher and high-altitude research by Werner von Braun-era programs advanced cloud physics; international standards were codified through meetings of the International Meteorological Organization and later World Meteorological Organization. Cultural resonance runs from comedic staging in Aristophanes to Romantic landscape painting by John Constable and Impressionist canvases by Claude Monet, and into 20th-century cinema and photography associated with Ansel Adams and Alfred Hitchcock.
Cloud particles comprise liquid water, ice crystals, mixed-phase hydrometeors, and solid aerosols such as dust from Sahara Desert, sea salt from Atlantic Ocean, volcanic ash from Mount St. Helens and organic nuclei associated with Amazon Rainforest. Microphysical processes—condensation, deposition, riming, aggregation—are studied via probes flown from NASA platforms, field campaigns like ARM Climate Research Facility and in situ sampling by teams linked to Scripps Institution of Oceanography and University of Reading. Optical properties derive from Mie and Rayleigh scattering theories developed by Gustav Mie and Lord Rayleigh, and radiative transfer calculations used by Roger Revelle and Syukuro Manabe.
Traditional taxonomy differentiates high, middle and low genera—cirrus, altostratus, nimbostratus, cumulus, stratus—with species and varieties formalized in manuals from the World Meteorological Organization and manuals used by aviation regulators like International Civil Aviation Organization. Special forms include lenticular clouds downwind of Rocky Mountains and Himalayas, mammatus beneath thunderstorm anvils of systems such as Hurricane Katrina, and polar mesospheric clouds observed during campaigns involving European Space Agency missions and polar stations like McMurdo Station.
Mechanisms include orographic lifting over ranges such as the Andes, frontal ascent along boundaries documented in analyses by Vilhelm Bjerknes, convective instability in regions studied by CISK proponents, and turbulent mixing in boundary layers examined in projects like Project Stormfury. Cloud lifecycle—nucleation mediated by aerosols from Industrial Revolution emissions, growth via vapor diffusion described by James Clerk Maxwell-derived diffusion principles, and precipitation formation through collision-coalescence and ice-phase pathways—links to aerosol research at Lawrence Berkeley National Laboratory and modeling at MIT and University of Washington.
Clouds regulate planetary albedo, greenhouse trapping, and precipitation patterns influencing phenomena catalogued by El Niño–Southern Oscillation, Madden–Julian oscillation, and teleconnections identified by Edward Lorenz. Feedbacks involving low stratocumulus decks over California Current systems or high cirrus produced by contrails from Boeing 747 and other jets affect radiative budgets in global models from IPCC assessment reports. Aerosol–cloud interactions stemming from emissions studied by Intergovernmental Panel on Climate Change and observational networks coordinated by GCOS complicate projections in simulations run on facilities such as NCAR supercomputers.
Cloud imagery permeates works from ancient drama by Aristophanes through sonnets by William Wordsworth, odes by Percy Bysshe Shelley, painting by John Constable and J. M. W. Turner, to photography by Ansel Adams and cinematic sequences in films by Alfred Hitchcock and Terrence Malick. Scientific poets and diarists—Henry David Thoreau, Ralph Waldo Emerson—and contemporary novelists referencing atmospheric motifs include J. G. Ballard and Annie Proulx. Iconography of clouds appears in emblematic pieces at institutions such as the Tate Gallery and Museum of Modern Art, and inspires installations by artists connected to projects at Smithsonian Institution and festivals like Venice Biennale.
Category:Atmospheric phenomena