Data Overview AMSR V002 • AE_L2A AMSR-E/Aqua L2A Global Swath Spatially-Resampled Brightness Temp... more Data Overview AMSR V002 • AE_L2A AMSR-E/Aqua L2A Global Swath Spatially-Resampled Brightness Temperatures • AE_Ocean AMSR-E/Aqua L2B Global Swath Ocean Products derived from Wentz Algorithm MODIS Series 51 • MYD06_L2 Aqua MODIS Level 2 Cloud Product Introduction Marine stratocumulus clouds are important sources of net cooling in the global radiation budget and are poorly represented in global climate models. Several field studies have shown that drizzle has a role in modulating low cloud mesoscale structures, cloud fraction and albedo. In this work, we use an 89 GHz passive microwave emission algorithm to document the spatial frequency of drizzle occurrence during the day and at night off the coasts of California, Peru and Namibia for the period 2002-2011 (the entire AMSR-E data set). The resulting climatology is more comprehensive than previous work using the Cloudsat radar and allows us to do regional as well as interannual comparisons. Fig. 2. MODIS visible images of stratocumulus cloud decks in each area of interest a) off the coast of California on 24 July 2009 at 21:40 UTC, b) off the coast of Peru on 3 September 2009 at 19:45 UTC and c) off the coast of Namibia on 11 October 2009 at 14:10 UTC.
Data projects pertaining to KWAJEX are described.Data sets delivered to the Goddard Distributed A... more Data projects pertaining to KWAJEX are described.Data sets delivered to the Goddard Distributed Active Archive Center (DAAC): 1) Kwajalein Experiment (KWAJEX) S-band calibrated, quality-controlled radar data, 1221 1 files of 3D volume data and 6832 files of 2D low-level reflectivity. 2) Raw and quality-control- processed versions of University of Washington Joss-Waldvogel disdrometer measurements obtained during KWAJEX. 3) A time series of synoptic-scale gif images of the Geostationary Meteorological Satellite (GMS) IR data for the KWAJEX period. The GMS satellite data set for the KWAJEX period was obtained from the University of Wisconsin and reprocessed into format amenable for comparison with radar data.Aircraft microphysics flight-leg definitions for all aircraft and all missions during KWAJEX were completed to facilitate microphysics data processing.
ABSTRACT A unique combination of satellite and shipborne Doppler radar data from the 2001 East Pa... more ABSTRACT A unique combination of satellite and shipborne Doppler radar data from the 2001 East Pacific Investigation of Climate Stratocumulus (EPIC Sc) field experiment are examined to study the characteristics of marine stratocumulus drizzle cells. Infrared satellite images are used to classify the cloud structures into closed cellular, open cellular, or unclassifiable categories. Both horizontal and vertical cross sections of radar reflectivity and radial velocity are used to characterize the microphysical and kinematic structures of the drizzle cells. Distributions of drizzle cell structure, size, and intensity are similar among the cloud structure categories, though the open-cellular distributions are shifted toward higher values. Stronger and larger drizzle cells preferentially occur when the cloud field is broken (open-cellular and unclassifiable categories). Individual drizzle cells about 2-20 km across usually showed precipitation growth within the cloud layer and evaporation below, divergence near echo top, and convergence below cloud base. Diverging flow near the surface was also observed beneath heavily precipitating drizzle cells. As the cloud field transitioned from a closed to an open-cellular cloud structure, shipborne radar revealed prolific development of small drizzle cells (
Data Overview AMSR V002 • AE_L2A AMSR-E/Aqua L2A Global Swath Spatially-Resampled Brightness Temp... more Data Overview AMSR V002 • AE_L2A AMSR-E/Aqua L2A Global Swath Spatially-Resampled Brightness Temperatures • AE_Ocean AMSR-E/Aqua L2B Global Swath Ocean Products derived from Wentz Algorithm MODIS Series 51 • MYD06_L2 Aqua MODIS Level 2 Cloud Product Introduction Marine stratocumulus clouds are important sources of net cooling in the global radiation budget and are poorly represented in global climate models. Several field studies have shown that drizzle has a role in modulating low cloud mesoscale structures, cloud fraction and albedo. In this work, we use an 89 GHz passive microwave emission algorithm to document the spatial frequency of drizzle occurrence during the day and at night off the coasts of California, Peru and Namibia for the period 2002-2011 (the entire AMSR-E data set). The resulting climatology is more comprehensive than previous work using the Cloudsat radar and allows us to do regional as well as interannual comparisons. Fig. 2. MODIS visible images of stratocumulus cloud decks in each area of interest a) off the coast of California on 24 July 2009 at 21:40 UTC, b) off the coast of Peru on 3 September 2009 at 19:45 UTC and c) off the coast of Namibia on 11 October 2009 at 14:10 UTC.
Data projects pertaining to KWAJEX are described.Data sets delivered to the Goddard Distributed A... more Data projects pertaining to KWAJEX are described.Data sets delivered to the Goddard Distributed Active Archive Center (DAAC): 1) Kwajalein Experiment (KWAJEX) S-band calibrated, quality-controlled radar data, 1221 1 files of 3D volume data and 6832 files of 2D low-level reflectivity. 2) Raw and quality-control- processed versions of University of Washington Joss-Waldvogel disdrometer measurements obtained during KWAJEX. 3) A time series of synoptic-scale gif images of the Geostationary Meteorological Satellite (GMS) IR data for the KWAJEX period. The GMS satellite data set for the KWAJEX period was obtained from the University of Wisconsin and reprocessed into format amenable for comparison with radar data.Aircraft microphysics flight-leg definitions for all aircraft and all missions during KWAJEX were completed to facilitate microphysics data processing.
ABSTRACT A unique combination of satellite and shipborne Doppler radar data from the 2001 East Pa... more ABSTRACT A unique combination of satellite and shipborne Doppler radar data from the 2001 East Pacific Investigation of Climate Stratocumulus (EPIC Sc) field experiment are examined to study the characteristics of marine stratocumulus drizzle cells. Infrared satellite images are used to classify the cloud structures into closed cellular, open cellular, or unclassifiable categories. Both horizontal and vertical cross sections of radar reflectivity and radial velocity are used to characterize the microphysical and kinematic structures of the drizzle cells. Distributions of drizzle cell structure, size, and intensity are similar among the cloud structure categories, though the open-cellular distributions are shifted toward higher values. Stronger and larger drizzle cells preferentially occur when the cloud field is broken (open-cellular and unclassifiable categories). Individual drizzle cells about 2-20 km across usually showed precipitation growth within the cloud layer and evaporation below, divergence near echo top, and convergence below cloud base. Diverging flow near the surface was also observed beneath heavily precipitating drizzle cells. As the cloud field transitioned from a closed to an open-cellular cloud structure, shipborne radar revealed prolific development of small drizzle cells (
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