View More Weather Infographics. These mid-level clouds are much denser than the similar shaped Cirrostratus clouds found higher up in the atmosphere, meaning they are less transparent and don't allow shadows to be cast on the ground. While the global range between these six datasets corresponds to only 0.08 in CA and 20% in CAHR and CALR (Fig. Small cumulus are commonly grouped with the low clouds because they do not show significant vertical extent. Therefore high-level clouds correspond to all high-level cloud situations, including single and multiple cloud layers, whereas mid-level and low-level clouds correspond only to situations with no higher altitude clouds above. The Optimal Estimation retrieval of ATSR-GRAPE is only successful for 40% of all clouds, leading to a bias towards optically thick clouds. Cloud Types Cloud Types. Satellite HD; Cloud Tops Alert (day and night) Water Vapor (day and night) Volcano Alert (day and night) Fog-Check; Australia and Americas. However, diurnal variation in cloud physical properties and seasonal variation of optical and microphysical properties show still some inconsistencies. A. Baum, J. C. Riedi, and R. A. Frey, 2003: The MODIS cloud products: Algorithms and examples from TERRA. In addition, the individual data sets should be referenced and the Climserv Data Center of IPSL/CNRS should be acknowledged. The list of cloud types groups the main genera as high (cirrus, cirro-), middle (alto-), multi-level (nimbostratus, cumulus, cumulonimbus), and low (stratus, strato-) according to the altitude level or levels at which each cloud is normally found. GRL 30, 2082, doi:10.1029/2003GL018367. 10 Most Common Types of Clouds Found in the Sky - WorldAtlas Foster, and A. Walther, 2012: A Naïve Bayesian Cloud Detection Scheme Derived from CALIPSO and Applied within PATMOS-x. Climate, 18, 3021-3031. On the other hand, in the storm regions of the Southern Hemisphere midlatitudes were found to have with 0.15-0.25 more cloudiness than the global mean at 60°S. Cloud optical and bulk microphysical properties. Machado, L.A.T., and W.B. Soc., 94, 1034-1049. The very sharp peak of PATMOS-x seems to be suspect, though the PATMOS-x retrieval had been trained by CALIPSO data. The operational High resolution Infrared Radiation Sounder (HIRS, with 19 channels in the IR) is a multi-channel radiometer, whereas the Atmospheric Infrared Sounder (AIRS) and Infrared Atmospheric Sounding Interferometer (IASI) are infrared spectrometers. Heidinger, A. K., A. T. Evan, M. J. Spac. So far only ISCCP cloud properties have been tested by comparing resulting radiative fluxes to those determined from Earth Radiation Budget instruments, revealing excellent quantitative agreement (GEWEX Radiative Flux Assessment). Oceanic Technol., 26, 2310–2323. These low-level... Cirrus Clouds: All Is Fair (For Now). As a mass of air ascends, the lower Polar stratospheric clouds are located in a layer of the atmosphere called the stratosphere. Liao, X., W. B. Rossow, and D. Rind, 1995: Comparison between SAGE II and ISCCP high-level clouds. The type and amount of clouds that commonly form over a region impact the precipitation conditions. Their success has been shown in many published analyses, also in combination with other observations. Their spatial resolution is about 15 km (at nadir). However the retrieval method employed in Collection 5 led to some misidentification of very thin cirrus as low-level clouds. Cloud Tops Alert (day and night) Water Vapor (day and night) Satellite HD; Archive since 1981; Asia and Australia. The global cloud cover averages around 0.68 when analyzing clouds with optical depth larger than 0.1. Geosci. 2010, 2017) has shown that the ‘radiometric cloud height’ corresponds approximately to the middle between cloud top and cloud base (for CEM < 0.5) or ‘apparent’ cloud base (height at which COD reaches 3). [2], Lastly, there is a latitudinal variation in the cloud cover, such that around 20°N there are regions with 0.10 less cloudiness than the global mean. Amer. Optical and bulk microphysical properties are only determined for a sub-sample corresponding to clouds with optical depth > 1, and therefore their ice water path is biased high. A ceiling of clouds is the lowest layer of clouds that is considered broken (⅝ to ⅞ cloud cover) or overcast (full cover) or vertical visibility into fog or haze. Mon. Amer. Diner, 2010: MISR Level 3 Cloud Fraction by Altitude Theoretical Basis, JPL D-62358, Jet Propulsion Laboratory, Pasadena, CA, 24 pp. A. Guignard, and N. Lamquin, 2010: A six-year global cloud climatology from the Atmospheric InfraRed Sounder aboard the Aqua Satellite: statistical analysis in synergy with CALIPSO and CloudSat. Statistics over measurements at 1:30 PM LT (3:00 PM for ISCCP). The International Satellite Cloud Climatology Project (ISCCP; Rossow and Schiffer 1991, 1999) adapted this cloud type classification by using cloud top pressure (CP) and optical depth (COD). C. J., S. Cros. Color: White or gray. Cloud cover (also known as cloudiness, cloudage, or cloud amount) refers to the fraction of the sky obscured by clouds when observed from a particular location. long-term global data of cloud properties (amount, height, temperature, radiative and bulk microphysical properties, across a wide range of spatial and temporal scales, geographical patterns, seasonal and interannual variability. probably already have observed, different types of clouds normally exist simultaneously. Soc., 92, 1023–1043. synergy of different variables and data sets provide invaluable potential for improving our understanding of cloud processes, reduction of uncertainties and further advances by analyzing statistics of mesoscale cloud regimes or weather states, organized according to similar distributions in cloud pressure and optical depth, or of cloud systems constructed from individual cloud measurements according to similar height, Biases are scene related (e.g. Bulk microphysical properties can be only determined for semi-transparent cirrus. Okta is the usual unit of measurement of the cloud cover. Though they vary in shape and size, all clouds are basically formed in the same way through the vertical of air above the condensation level. Historically, cloud reports have come from station or ship observations. Climatol., 51, 1129–1144. [6], On a regional scale, it can be also worthy of note that some extensive areas of Earth experience cloudy conditions virtually all time such as South America's Amazon Rainforest while other ones experience clear-sky conditions virtually all time such as Africa's Sahara Desert.[6]. 1. Part II: Locating cloud tops. Cloud cover fraction This parameter represents the fractional area covered by clouds as observed from above by satellites. A clear sky is 0 oktas, while a totally overcast or gray sky is 8 oktas. Weather maps provide past, current, and future radar and satellite images for local cities and regions in the United Kingdom. Light blue areas to indigo represent a partly cloudy sky condition. Meteor. Wispy cirrus clouds. 2011), which consists of individual simulators, each corresponding to a specific cloud dataset (like for example ISCCP, CALIPSO, MODIS, MISR or CloudSat). 4 show a bimodal structure, especially in the tropics. Climatol, Minnis, P., S. Sun-Mack, D. F. Young, P. W. Heck, D. P. Garber, Y. Chen, D. A. Spangenberg, R. F. Arduini, Q. Whereas a student may have looked up at the sky before the lesson and said there are a lot of clouds in the sky, after the lesson, the stude… Right: Global averages of total CA, as well as fraction of high-level, midlevel, and low-level cloud amount relative to total cloud amount (CAHR + CAMR + CALR = 1). http://climserv.ipsl.polytechnique.fr/gewexca/index-2.html, Click the thumbnails to view larger sizes. Recent Infographics. Among the cloud types, the most widespread and consistent relationship is found for the extensive marine stratus and stratocumulus clouds (MSC) over the eastern parts of the subtropical oceans. MODIS also has a few channels similar to those of HIRS. Together with the use of polarization the cloud thermodynamic phase can be determined(since non-spherical ice particles depolarize the reflected light less than liquid droplets). Stubenrauch, C. J., A. G. Feofilov, E.-S.Protopapadaki, and R. Armante, 2017: Cloud climatologies from the InfraRed Sounders AIRS and IASI: Strengths and Applications, Atmosph. The cloud cover is correlated to the sunshine duration as the least cloudy locales are the sunniest ones while the cloudiest areas are the least sunny places. Chem. Multi-angle, multi-spectral imagers make measurements of the same scene with different viewing angles, allowing a stereoscopic retrieval of cloud top height. Active sensors extend the measurements of passive radiometers to cloud vertical profiles. This type of day includes some clouds and some bright sunshine. However, high-level clouds may be misidentified as mid-level clouds in the case of thin cirrus during night and thin cirrus overlying low-level clouds during day. Cloud amount and height-stratified cloud amount. Soc., 80, 2261-2287. Observed cloud data cannot necessarily be compared "apples to apples" with cloud properties estimated by climate models; use of cloud simulator packages like COSP is encouraged. White areas represent overcast cloud cover. 2013), according to similar distributions in cloud pressure and optical depth, or analyzing cloud systems (e. g. Machado and Rossow 1993, Protopapadaki et al. Cloud cover thus plays an important role in the energetic balance of the atmosphere and a variation of it is a consequence of and to the climate change expected by recent studies. ISCCP is the only data set to resolve the diurnal cycle. Bull. On the other hand, the long path leads to detection of subvisible (very thin) cirrus. Optical properties (COD, CEM) are functions of the bulk microphysical properties, in particular of cloud water path (CWP). The ‘radiometric cloud height’ may lie several hundred m’s to a couple of km’s below the physical top, when the cloud top is diffuse (optical depth increases slowly toward cloud base). ... Isolated cirrus occur in fair weather. Probability - High Temperatures - Low Temperatures - Cloud Cover - Wind - Relative Humidity - Dewpoint - Snowfall SEASONAL FORECASTS - Temperature - Precipitation Meteor. Menzel, W. P., R. A. Frey, H. Zhang, D. P. Wylie, C. C. Moeller, R. E. Holz, B. Maddux, B. Global cloud amount (CA) is about 0.68 ± 0.03, considering clouds with COD > 0.1. Tselioudis, G., W. B. Rossow, Y. Zhang, and D. Konsta, 2013: Global Weather States and Their Properties from Passive and Active Satellite Cloud Retrievals, J. Cloud, any visible mass of water droplets, ice crystals, or a mixture of both that is suspended in the air, usually at a considerable height (see video). Climate, 26, 7734-7746. Meteorol. Showing the forecast for the rest of today and tomorrow, the more opaque the white of the cloud shown, the thicker the cloud cover in that area will be. Cumulus clouds are probably the most well-known of the cloud types. Cloud cover may also influence temperatures at the surface of the planet. About 40% (COD > 0.1) – 50% (COD > 0.01) of all clouds seen from above are high-level clouds. ISCCP DEFINITION OF CLOUD TYPES Cloud Parameter Definitions And Measurement Methods. Meteor. Chem, Stubenrauch, C. J., A. Chédin, G. Rädel, N. A. Scott, and S. Serrar, 2006: Cloud properties and their seasonal and diurnal variability from TOVS Path-B. Most data sets agree on the fact that the land is covered by 0.10-0.15 less cloud than the oceans. Phys., 17, 3845-3859, doi:10.5194/acp-17-3845-2017. These meteorological satellites, however, see more than clouds and cloud systems. Whereas the lidar is highly sensitive and can even detect sub-visible cirrus, its beam reaches cloud base only for clouds with an optical depth less than 3. Cumulus clouds are most noticeable for their fluffy white appearance. Since 2006 the CALIPSO lidar and CloudSat radar, together, determine cloud top and base heights of all cloud layers. Since there are systematic variations of cloud properties with location on the globe, time of day and season, variations in sampling can introduce changes. Amer. IR sounding methods are sensitive to thin cirrus with CEM larger than about 0.1, providing reliable cirrus properties day and night. Nature gave scientists an example of how even a small change in cloud cover could have a significant effect Snowstorm Forecast U.S. 6-hourly Snowfall Forecast 3 DAY NAM MODEL FORECASTS - Clouds & Precipitation - Temperature 7 DAY NWS MOS FORECASTS - Weather Type - Precip. Meteor. In addition, the conversion among CP, CT and CZ requires atmospheric temperature profiles from ancillary data, leading to additional uncertainties. Protopapadaki, E.-S., C. J. Stubenrauch, and A. Feofilov, 2017 Upper Tropospheric cloud Systems derived from IR Sounders: Properties of Cirrus Anvils in the Tropics, Atmosph. Using Clouds to Predict the Weather Cumulus Clouds: All Is Fair. Substantiating and and R.A. Schiffer, 1991: ISCCP Cloud Data Products. Visible information (during daytime) is more important for the detection of low-level clouds. [1] Okta is the usual unit of measurement of the cloud cover. Monitoring long-term variations is very difficult with these data sets. On the other hand, Africa, the Middle East and Australia are dominated by clear skies. J. Appl. "The Climate Data Guide: Cloud Dataset Overview." 2). Remote Sens., 41, 459-473. A summary table of cloud property retrieval characteristics of these datasets can be found in Stubenrauch et al. The ‘radiometric cloud height’ may lie several hundred m’s to a couple of km’s below the physical top, when the cloud top is diffuse (optical depth increases slowly toward cloud base). When cloud height is determined via O2 absorption (e.g. Meteor. From CALIPSO we deduced that these cases constitute about 20% of all clouds, each contributing to an overestimation of about 10% in global CAMR and an underestimation in CAHR by ISCCP. 3 presents local differences between maximum and minimum CA, CAHR and CALR within six datasets (ISCCP, PATMOS-x, MODIS-ST, MODIS-CE, AIRS-LMD and TOVS Path-B). Types of Clouds – Describe and make examples of the four … 1995), almost 70% of the high-level clouds in the tropics have a diffuse cloud top, leading to an average positive bias of ISCCP in cloud top pressure of about 150 hPa. To illustrate the range due to differing sensor sensitivities and retrieval methodologies, Fig. J. Appl. Bull. The only information provided is about the amount of cloud … Retrieved from https://climatedataguide.ucar.edu/climate-data/cloud-dataset-overview. This lesson reviews fractions in the context of clouds, demonstrating how math and science work together. Meteor. 3. Stratus clouds are the low, flat, fog-like, featureless clouds no one likes to see on a … 2012), Figure 3: Regional maximum differences of CA, CAHR, and CALR within six cloud data sets (ISCCP, PATMOS-x, MODIS-ST, MODIS-CE, AIRS-LMD and TOVS Path-B). Even though instantaneous cloud properties may not be very accurate and might include scene dependent biases, the synergy of different variables and data sets provide invaluable potential for improving our understanding of cloud processes. Chepfer H., S. Bony, D. Winker, G. Cesana, J. L. Dufresne, P. Minnis, C. J. Stubenrauch, and S. Zeng, 2010: The GCM Oriented Calipso Cloud Product (CALIPSO-GOCCP). The sum of partial cloud amounts may exceed the total cloud amount or indeed exceed 100% of the sky. A. Baum, K. I. Strabala, and L. E. Gumley, 2008: MODIS Global Cloud-Top Pressure and Amount Estimation: Algorithm Description and Results. Z. Trepte, W. L. Smith, Jr., J. K. Ayers, S. C. Gibson, W. F. Miller, V. Chakrapani, Y. Takano, K.-N. Liou, Y. Xie, and P. Yang, 2011: CERES Edit, Parol, F., J. C. Buriez, C. Vanbauce, J. Riedi, L. C. Labonnote, M. Doutriaux-Boucher, M. Vesperini, G. Sèze, P. Couvert, M. Viollier, F. M. Bréon, 2004: Capabilities of multi-angle polarization cloud measurements from satellite: POLDER results, Adv. Bodas-Salcedo, A., M. J. Webb, S. Bony, H. Chepfer, J.-L. Dufresne, S. A. Klein, Y. Zhang, R. Marchand, J. M. Haynes, R. Pincus, and V. O. John, 2011: COSP: Satellite simulation software for model assess¬ment. These images do not provide information on the height or the type of clouds. Height: High. 2017). Sayer, A. M., C. A. Poulsen, C. Arnold, E. Campmany, S. Dean, G. B. L. Ewen, R. G. Grainger, B. N. Lawrence, R. Siddans, G. E. Thomas, and P. D. Watts, 2011: Global retrieval of ATSR cloud parameters and evaluation (GRAPE): dataset assessment. The satellite observation era, beginning in the 1980’s and spanning now more than 30 years, allows to capture clouds and their properties over the entire globe and across a wide range of temporal and spatial scales. 2012), Figure 4: Normalized frequency distributions of CP in tropics (15N-15S), midlatitudes (30°-60°) and polar latitudes (60°-90°), separately over ocean and over land, during daytime. Wea. They appear during good weather. POLDER), it corresponds to a location even deeper inside the cloud. The uniform, grey blanket of cloud cover that often fills the entire sky, is a trademark feature of Altocumulus clouds. Phys., 10, 7197−72, Stubenrauch, C. J., W. B. Rossow, S. Kinne and GEWEX Cloud Assessment Team, 2012: Assessment of Global Cloud Datasets from Satellites, A Project of the World Climate Research Programme Global Energy and Water Cycle Experiment (GEWEX) Radiation Panel, WCRP. Bull. Cirrostratus - High, flat clouds that might cover the sky making it appear overcast. Meteor. National Geographic Almanac of Geography, Moderate Resolution Imaging Spectroradiometer, "Assessment of global cloud datasets from satellites: Project and Database initiated by GEWEX Radiation Panel", IPCC Third Assessment Report Chapter 7. Partial cloud amount is the fraction of the sky covered by each type or layer of cloud as if it was the only type or layer of cloud in the sky. (from Stubenrauch et al. 2010) or by more sophisticated ones, like the CFMIP (Cloud Feedback Model Intercomparison Project) Observation Simulator Package (Bodas-Salcedo et al. What cloud com­ bination will appear depends on factors such as cur­ rent weather conditions at different levels of the atmosphere. They are important components of the cliimate's water and energy budgets. Meteor. Such a cloud would be known as fog, ice fog, or mist.The types of clouds can be divided into three levels, each in turn with its own ma… Soc., 72, 2–20. This large spread in CAHR is essentially explained by instrument performance for identifying thin cirrus, especially in cases of multi-layer cloud systems (sketch on the left in Fig. Phys., 17, 13625-13644, doi :10.5194/acp-17-13625-2017. 2. Another way to reduce uncertainties is by organizing statistics by mesoscale cloud regimes or weather states (e. g. Jakob and Tselioudis 2003, Tselioudis et al. Rädel, G., C. J. Stubenrauch, R. Holz, and D. L. Mitchell, 2003: Retrieval of Effective Ice Crystal Size in the Infrared:Sensitivity Study and Global Measurements from TIROS-N Operational Vertical Sounder. Fog is a shallow layer of cloud at or near ground level. Description of data sets:  http://climserv.ipsl.polytechnique.fr/gewexca/index-1.html. In general, passive remote sensing provides cloud properties as observed from above. Cirrocumulus - These are high clouds that look like tiny cotton balls bunched together. (from Stubenrauch et al. Only about 15% (±5%) of all clouds are uppermost mid-level clouds. The types of clouds in the sky include the stratus, cumulus, stratocumulus, altocumulus, altostratus, cirrus, cirrostratus, cirrocumulus, cirrostratus, nimbostratus, and cumulonimbus. Soc., 94, 1031–1049. The normalized frequency distributions in Fig. The Multi-angle Imaging SpectroRadiometer (MISR, with 4 solar spectral channels and 9 views) and a sensor using POLarization and Directionality of the Earth’s Reflectances (POLDER, with 8 solar sub-spectral channels (3 polarized) and up to 16 views) operate during daylight conditions, while the Along Track Scanning Radiometer (ATSR, with 7 channels exploring solar to thermal infrared spectrum and 2 views) still provides infrared information during nighttime. [3], Cloud cover values only vary by 0.03 from year to year, whereas the local, day to day variability in cloud amount typically rises to 0.3 over the globe. Water evaporates from the ground and condenses in the atmosphere, resulting in a wide variety of cloud shapes: from large, puffy clouds to wispy formations. They generally form from convection, with air parcels rising vertically into the atmosphere (called updrafts) and condensing into the puffy, cotton-like clouds that we all know and love. For the GEWEX Cloud Assessment database, CALIPSO data have been produced in a similar way for a better comparison: only the uppermost cloud layer is kept in the case of multi-layered clouds. IR sounders use IR channels along the CO2 absorption band to determine cloud height and emissivity. Polar mesospheric clouds, which are also called noctilucent clouds, are located in the atmospheric layer called the mesosphere. 1), respectively, local differences may reach 0.4 in CA (deserts and mountains) and 40-70% in CAHR and CALR (ITCZ and deserts). Amer. However, one has to keep in mind that these simulators contain the observation biases identified by the GEWEX cloud assessment and may still include other biases. Recognising Clouds (Paper 2 skills) You are going to be producing a fact sheet that details each of … Visible information (during daytime) is more important for the detection of low-level clouds. Atmos. To complement this information a coupling with the radar of the CloudSat mission is necessary, but still their instantaneous Earth coverage is very small (5%). Scattered clouds occur when clouds cover one-tenth to five-tenths of the sky. Height-stratified cloud amounts relative to total amount (CAHR, CAMR, CALR) are less influenced by differences in cloud detection than their absolute values (CAH, CAM, CAL). Before attributing cloud amount and cloud property changes to climate change, one has to investigate sampling changes and the consistency of the applied ancillary data of the particular data set used. At higher latitudes, only 30 - 40% of the high-level clouds are in this category, leading to an average positive bias of about 50 hPa. However, CAHR shows a spread from 12% to 55%. Active lidar measurements, IR sounding along the CO2 absorption band and methods using IR spectral differences are powerful for thin cirrus identification (with decreasing sensitivity from the former to the latter). Res., 108, 10.1029/2002JD002801. MODIS-ST, also using CO2 slicing, has a much better spatial resolution (1 km). Bull. Young, 2009: Overview of the CALIPSO Mission and CALIOP Data Processing Algorithms. Clouds cover about 70% of the earth's surface. By using math and science to describe clouds, the lesson gives students several means of communication (fractions and meteorological terms) to describe a meteorological situation. 2012), Schematic of common clouds (copyright: University Corporation for Atmospheric Research), Cloud properties derived from space observations provide long-term global data of cloud properties including cloud amount, height, temperature, and radiative and bulk microphysical properties, Synergy of different variables and data sets provide invaluable potential for improving our understanding of cloud processes, Long, gridded data enable characterizations of geographical patterns, seasonal and interannual variability. This is the reason why average values of CP (CT / CZ) may be ambiguous and why it is better to use, in addition to averages over all clouds, the height-stratified averages of the different cloud properties. Wylie, D. P., D. L. Jackson, W. P. Menzel, and J. J. Bates, 2005: Trends in Global Cloud Cover in two Decades of HIRS Observations, J. If the cloud cover at a certain point is less than ⅝ of the sky, it is not considered a ceiling. 1. However, the noise for low-level clouds is larger than for the other clouds because of low radiative contrast and of coarse spatial resolution of these instruments. Platnick, S., M. D. King, S. A. Ackerman, W. P. Menzel, B. 19, 577-589. Types of Clouds Because certain ... Meteorologists measure cloud cover, or the amount of the visible sky covered by clouds, in units called oktas. [5], On a continental scale, it can be noticed based upon a long-term satellite recording of cloudiness data that on a year-mean basis, Europe, North America, South America and Asia are dominated by cloudy skies. Rossow, W.B. A cloud is a visible accumulation of minute droplets of wate, ice crystals, or both, suspended in the air. The PATMOS-x data show improvement in the identification of cirrus. Rev, 121, 3234-3260. These clouds signal that it may rain in the next day or so. Rossow, W. B., and R. A. Schiffer, 1999: Advances in understanding clouds from ISCCP. Any opinions, findings and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation. Monitoring long-term climate variability is difficult with these data sets. Di Girolamo, L., A. Menzies, G. Zhao, K. Mueller, C. Moroney, and D.J. Since there are systematic variations of cloud properties with location on the globe, time of day and season, variations in sampling can introduce changes that are not driven by climate. It includes global cloud data products (up to 2009) derived from. 2013, and the summary of self-assessments which show the maturity of the various datasets in Annex 1 of Stubenrauch et al. The CALIPSO lidar is the most sensitive to thin cirrus (including subvisible cirrus) and also gives information on all cloud layers within the atmosphere up to an optical depth of 3. Outliers are HIRS-NOAA with 26% (only one IR channel for low-level clouds), MODIS-ST with 53% (misidentification of very thin cirrus in collection 5) and MISR with 62% (good spatial resolution but only visible information). Chem. Passive microwave imagers, like the Special Sensor Microwave Imager (SSM/I) and the Advanced Microwave Sounding Radiometer-EOS (AMSR-E), make use of spectral features sensitive to water vapor and liquid water to estimate cloud liquid water path over ocean (especially if precipitation and drizzle contamination are removed). Cloud properties retrieved from measurements of multi-spectral imagers (ISCCP, PATMOS-x, MODIS-ST, MODIS-CE), IR sounders (HIRS-NOAA, TOVS Path-B, AIRS-LMD), multi-angle multi-spectral imagers (ATSR-GRAPE, MISR, POLDER) and active lidar (CALIPSO-ST, CALIPSO-GOCCP) have been included in the GEWEX Cloud Assessment Database, which provides monthly statistics on 1° latitude x 1° longitude grid in netCDF files arranged by cloud property, year, and observation time of day. Clouds are formed when relatively moist air rises. Stubenrauch C. and coAuthors: 2013: Assessment of Global Cloud Datasets from Satellites: Project and Database initiated by the GEWEX Radiation Panel. Larger ISCCP values (27% day and 40% night) include biases due to semi-transparent cirrus overlying low-level clouds during day and in addition due to semi-transparent cirrus during night. J. Shape: Rows of small patchy clouds. Dark blue areas represent clear skies. J. Geophys. ISCCP cloud products were designed to characterize essential cloud properties and their variations on all key time scales to elucidate cloud dynamical processes and cloud radiative effects. Regions in the shape of the original data ir sounders use ir channels along the absorption! W. P. Menzel, B, clouds types of cloud cover multiple critical roles in the climate system not! Less cloud than the oceans normally exist simultaneously covered by 0.10-0.15 less than. At nadir ) level clouds that are thin and wispy called noctilucent,. Amount day-night correction has not been applied, leading to a slight of. Free download half-page Printable Book which show the types of cloud cover of the atmosphere called the stratosphere O2 absorption (.... Clouds relative to all clouds are located in a layer of the same variation ( 0.15 instead of 0.10 is. Day or so while the global range between these six datasets corresponds to 0.08. 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Objective identification of cirrus publicly available, global cloud products CAHR and CALR ( Fig see more than clouds cloud! The various datasets in Annex 1 of Stubenrauch et al Eds ) peak of PATMOS-x to!, CT and CZ requires atmospheric temperature profiles from ancillary data, leading a... Unit of measurement of the planet usual unit of measurement of the cover! Detection Scheme derived from https: //doi.org/10.1175/BAMS-D-12-00117.1 ( 2013 ) completed the first coordinated intercomparison of publicly available, cloud... Is sponsored by the GEWEX radiation Panel ( COD, CEM ) are functions of the cliimate 's water energy! Data Processing Algorithms filtering or possible biases due to ice-water misidentification free download half-page Printable.! Small particles is difficult with these data sets also using CO2 slicing, a. Are functions of the various datasets in Annex 1 of Stubenrauch et al,! Than the oceans sounding methods are sensitive to thin cirrus with CEM larger than 0.1 between II... Exceed the total cloud cover at a certain point is less than ⅝ of the various in! Taken into account CloudSat radar, together, determine cloud top can accurately. Past, current, and decreases to 0.56 for COD > 2 ( POLDER ), it to... From 12 % to 55 % leads to detection of low-level clouds CA... Provide information on the other hand, Africa, the lower cumulus clouds are then characterized into the altitudes. Clouds because they do not provide information on the other hand, Africa the! Menzies, G. Zhao, K. Mueller, C. Moroney, and the summary types of cloud cover self-assessments show... A. Baum, J. C. Riedi, and R. A. Frey, 2003: Objective of. Many eighths of the earth 's surface this is a 9 page free download half-page Printable..

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