Towards A Representation of Vertically Resolved Ozone Changes in Reanalyses

Abstract: The Solar Backscatter Ultraviolet Radiometer (SBUV) instruments on NASA and NOAA spacecraft provide a long-term record of total-column ozone and deep-layer partial columns since about 1980. These data have been carefully processed to extract long-term trends and offer a valuable resource for ozone monitoring. Studies assimilating limb-sounding observations in the Goddard Earth Observing System (GEOS) data assimilation system (DAS) demonstrate that vertical ozone gradients in the upper troposp...

Click here to visit Original posting

Centrifuge in Free Fall: Combustion at Partial Gravity

Abstract: A centrifuge apparatus is developed to study the effect of variable acceleration levels in a drop tower environment. It consists of a large rotating chamber, within which the experiment is conducted. NASA Glenn Research Center 5.18-second Zero-Gravity Facility drop tests were successfully conducted at rotation rates up to 1 RPS with no measurable effect on the overall Zero-Gravity drop bus. Arbitrary simulated gravity levels from zero to 1-g (at a radius of rotation 30 cm) were produced. A si...

Click here to visit Original posting

A CFD Case Study of a Fan Stage with Split Flow Path Subject to Total Pressure Distortion Inflow

Abstract: This report is the documentation of the work performed under the Hypersonic Project of the NASA's Fundamental Aeronautics Program. It was funded through Task Number NNC10E444T under GESS-2 Contract NNC06BA07B. The objective of the task is to develop advanced computational tools for the simulation of multi-stage turbomachinery in support of aeropropulsion. This includes work elements in extending the TURBO code and validating the multi-stage URANS (Unsteady Reynolds Averaged Navier Stokes) sim...

Click here to visit Original posting

Ice Crystal Icing Research at NASA

Abstract: Ice crystals found at high altitude near convective clouds are known to cause jet engine power-loss events. These events occur due to ice crystals entering a propulsion system's core flowpath and accreting ice resulting in events such as uncommanded loss of thrust (rollback), engine stall, surge, and damage due to ice shedding. As part of a community with a growing need to understand the underlying physics of ice crystal icing, NASA has been performing experimental efforts aimed at providing ...

Click here to visit Original posting

Ozone from Sentinel-5P

One of the first images from the Copernicus Sentinel-5P mission shows how ozone is distributed around the world. While ozone in the stratosphere is a good thing, protecting us from the Sun’s ultraviolet radiation, lower down in the atmosphere it is a harmful pollutant. Ground level ozone is not emitted directly into the air, but is created by chemical reactions between oxides of nitrogen and volatile organic compounds in the presence of sunlight.

Read full article: Sentinel-5P brings air pollution into focus

Click here to visit Original posting

Pollution from power plants in India

Pollution from power plants in India was captured by the Copernicus Sentinel-5P mission on 10 November 2017. The worst of the pollution runs from north of Patna in the state of Bihar to south of Raipur in the state of Chhattisgarh.

Read full article: Sentinel-5P brings air pollution into focus

Click here to visit Original posting

Sentinel-5P First Light event webcast

Replay of the Copernicus Sentinel-5P First Light event, which was held at the DLR German Aerospace Center on 1 December 2017.

The event marked the release of the first images of air pollution from Sentinel-5P, which was launched from Russia on 13 October 2017. As well the first results being presented, the event also included talks from key players in the mission and in Europe’s Copernicus environmental monitoring programme. Even though the satellite is still being prepared for service, these first results were hailed as exceptional and show how this latest Copernicus satellite is set to take the task of monitoring air quality into a new era.

Click here to visit Original posting

Sentinel-5P captures Bali volcanic eruption

The Copernicus Sentinel-5P satellite imaged sulphur dioxide from the Mount Agung volcanic eruption on Bali, Indonesia, on 27 November 2017. As well as detecting different air pollutants, the mission also measures aerosols, as this image shows.

Read full article: Sentinel-5P brings air pollution into focus

Click here to visit Original posting