Page 12 - Aerotech News and Review, Jan. 5 2018

ER-2, from 10
or volcanic eruptions to gain a more comprehensive collection of different types of aerosols in different condi- tions. The aircraft test phase in sensor development is helpful for ensuring in- struments are collecting both accurate and useful data prior to the time the final version of the sensors makes its trip into space.
In addition to testing capabilities of new sensors, ACEPOL flights also provided calibration and evaluation data for NASA’s CALIPSO satellite lidar by staging satellite underpasses as part of their flight plans. In addition to comparisons with CALIPSO, ACEPOL also contributes to the development of future satellite missions including the European Space Agency’s EarthCare,
Right: ER-2 flight track color coded by aerosol amount for flight on November 7 for the ACEPOL campaign. Color coding indicates the amount of aerosol in the atmosphere, with orange and red colors indicating more aerosol, according to HSRL-2 preliminary data. Aerosol can include smoke, pollution, dust and sea salt.
the European Organization for the Ex- ploitation of Meteorological Satellites METOP-SG , and NASA’s MAIA and PACE programs.
The team completed nine flights that wrapped up mid-November, observing targets like California’s Central Valley and the Pacific Ocean, and as far east as Arizona, where the team observed smoke from controlled forest fires near Flagstaff.
The ER-2s payload includ- ed four airborne polarimeters (AirHARP, AirMSPI, AirSPEX and RSP) and two lidar instruments (CPL and HSRL-2). Each of the po- larimeters used different techniques and angles to measure and record data. The instruments also differed from one
another in size and power. From an en- gineering perspective, the ultimate goal of the ACEPOL mission was to better understand how those overall differ- ences translate into data collection.
The combination of the polarim- eter and lidar instruments, along with ground based data from stationary air quality measurement stations provide scientists with a more complete picture
of the three-dimensional distribution of aerosols in the Earth’s atmosphere. Uti- lizing a variety of different approaches for collecting data also enables scientists to differentiate various types of aerosols (e.g., smoke, dust, pollution) and clouds (cirrus, stratus, etc.).
The ACEPOL mission involved partnership between multiple NASA centers, including Langley Research
Center, Goddard Space Flight Center, the Goddard Institute for Space Stud- ies, and the Jet Propulsion Laboratory. The mission also included international partnership with the Netherlands Insti- tute for Space Research, which flew the AirSPEX instrument on board the ER-2 for the second time. The instru- ment made its maiden flight on the ER-2 in January 2016.
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The cockpit viewfinder in the ER-2 shows a controlled fire burning near Flagstaff, Ariz., on Nov. 7, 2017. This small fire event offered the ACEPOL science team a different test environment to observe with the polarimeter and lidar instruments onboard the aircraft.
NASA photograph by Stu Broce
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