Terrestrial glint seen from deep space: Oriented ice crystals detected from the Lagrangian point

  title={Terrestrial glint seen from deep space: Oriented ice crystals detected from the Lagrangian point},
  author={Alexander Marshak and Tam{\'a}s V{\'a}rnai and Alexander B. Kostinski},
  journal={Geophysical Research Letters},
  pages={5197 - 5202}
The Deep Space Climate Observatory (DSCOVR) spacecraft resides at the first Lagrangian point about one million miles from Earth. A polychromatic imaging camera onboard delivers nearly hourly observations of the entire sunlit face of the Earth. Many images contain unexpected bright flashes of light over both ocean and land. We construct a yearlong time series of flash latitudes, scattering angles, and oxygen absorption to demonstrate conclusively that the flashes over land are specular… 

Deep Space Observations of Sun Glints from Marine Ice Clouds

The results show that—using its observations at oxygen A-band absorption bands—EPIC can distinguish glints off marine ice clouds from those off the ocean surface and that EPIC observations can help constrain the radiative contribution of oriented ice crystals.

Deep Space Observations of Terrestrial Glitter

Deep space climate observatory (DSCOVR) spacecraft drifts about the Lagrangian point ≈1.4–1.6 × 106 km from Earth, where its Earth polychromatic imaging camera (EPIC) observes the sun‐lit face of the

Study of Terrestrial Glints Based on DSCOVR Observations

Small flashes of reflected light—called glints—are found in images taken by spacecraft observing the Earth, and occur due to specularly reflected solar radiation. These glints have been found over

Earth Imaging From the Surface of the Moon With a DSCOVR/EPIC-Type Camera

The Earth Polychromatic Imaging Camera (EPIC) on the Deep Space Climate Observatory (DSCOVR) satellite observes the entire Sun-illuminated Earth from sunrise to sunset from the L1 Sun-Earth Lagrange

Editorial: DSCOVR EPIC/NISTAR: 5 Years of Observing Earth From the First Lagrangian Point

a unique mission: the fi rst it delivers well-calibrated and multi-spectral measurements of Earth from the L1 point. This unique location allows near-hourly views of the entire illuminated disk of the

Lagrange Point Missions: The Key to next Generation Integrated Earth Observations. DSCOVR Innovation

Multiangle, multispectral datasets can be developed by integrating DSCOVR, LEO, and GEO data along with surface and airborne observations, when available, which can open the door for global application of algorithms heretofore limited to specific LEO satellites and development of new scientific tools for Earth sciences.

Operational Detection of Sun Glints in DSCOVR EPIC Images

Satellite images often feature sun glints caused by the specular reflection of sunlight from water surfaces or from horizontally oriented ice crystals occurring in clouds. Such glints can prevent

Synoptic ozone, cloud reflectivity, and erythemal irradiance from sunrise to sunset for the whole earth as viewed by the DSCOVR spacecraft from the earth–sun Lagrange 1 orbit

Abstract. EPIC (Earth Polychromatic Imaging Camera) on board the DSCOVR (Deep Space Climate Observatory) spacecraft is the first earth science instrument located near the earth–sun gravitational plus

Spectral Signature of the Biosphere: NISTAR Finds It in Our Solar System From the Lagrangian L‐1 Point

NISTAR, aboard the DSCOVR spacecraft, is one of the National Aeronautics and Space Administration's energy budget instruments designed to measure the seasonal changes in Earth's total outgoing

Earth Observations from DSCOVR/EPIC Instrument.

The observation of horizontally oriented ice crystals in clouds and the unexpected use of the O2 B-band absorption for vegetation properties are described.




Glint, the specular reflection of sunlight off Earth's oceans, may reveal the presence of oceans on an extrasolar planet. As an Earth-like planet nears crescent phases, the size of the ocean glint

Detecting the glint of starlight on the oceans of distant planets

A global view of horizontally oriented crystals in ice clouds from Cloud‐Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO)

We analyze optical signatures in 18 months of CALIOP layer-integrated backscatter and depolarization ratio to investigate the geographical and seasonal distribution of oriented crystals in ice clouds

Study of Ice Crystal Orientation in Cirrus Clouds Based on Satellite Polarized Radiance Measurements

The goal of this paper is to retrieve information about ice particle orientation in cirrus clouds. This is achieved by comparing simulations of sunlight reflection on a cirrus cloud with measurements

A Midlatitude Cirrus Cloud Climatology from the Facility for Atmospheric Remote Sensing. Part II: Microphysical Properties Derived from Lidar Depolarization

In Part II of this series of papers describing the results of the extended time observations of cirrus clouds from the University of Utah Facility for Atmospheric Remote Sensing (FARS), the

Ice particle habits in stratiform clouds

Ice crystals in clouds in the atmosphere have shapes that relate to their density, terminal fall velocity, growth rate and radiative properties. In calculations for climate‐change predictions,

Horizontally Oriented Plates in Clouds

Abstract Horizontally oriented plates in clouds generate a sharp specular reflectance signal in the glint direction, often referred to as “subsun.” This signal (amplitude and width) may be used to

A Midlatitude Cirrus Cloud Climatology from the Facility for Atmospheric Remote Sensing. Part III: Radiative Properties

Abstract In Part III of a series of papers describing the extended time high-cloud observations from the University of Utah Facility for Atmospheric Remote Sensing (FARS) supporting the First

Spatial and Temporal Distribution of Clouds Observed by MODIS Onboard the Terra and Aqua Satellites

The cloud effective particle radius of liquid water clouds is significantly larger over ocean than land, consistent with the variation in hygroscopic aerosol concentrations that provide cloud condensation nuclei necessary for cloud formation.