Promotion of Research on Climate and Earth System Science ...
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Promotion of Research on Climate and Earth System Science by Advanced Aircraft Observations: Plans for the New Aircraft Program of Japan
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Exective summary !
Promotion of Research on Climate and Earth System Science by Advanced Aircraft Observations:
Plans for the New Aircraft Program of Japan
Summary of the report of the Aircraft Observation Planning Committee
of the Meteorological Society of Japan (MSJ)
Toshiki Iwasaki (President of MSJ) and Makoto Koike (Chair of the
Committee)
February 14, 2019
1.! Background
The Earth’s environment has been changing rapidly, particularly as manifested by global
warming, and the changes are imposing large impacts on the fundamental structures of our
lives, including socio-economic activities and supplies of water and food. It is critically
important to fully understand the current status of the changes and to investigate the
controlling processes, in order to predict future changes and protect human society and
ecosystems from serious damage. At present, direct atmospheric observations by aircraft
are lacking in important geographical regions; they are needed for understanding
greenhouse gases, aerosol-cloud interactions, and the hydrologic cycle, including
predictions of typhoons and torrential downpours. Japan lacks an aircraft dedicated to
scientific measurements, so Japanese scientists have been obliged to charter commercial
aircraft for their experiments. Therefore it has been difficult to plan and conduct systematic
aircraft experiments, which are indispensable for studies of climate and Earth system
science.
2 Aims of the Program
The purpose of this program is promoting atmospheric and climate research as well as
Earth system science as a whole by introducing aircraft platforms for Earth observations.
We plan to acquire a dedicated aircraft and outfit it with an observation system that will be
designed and utilized by scientists from a variety of fields and institutions on a long-term
basis. Our aim is to enable the systematic planning of next-generation Earth observations
and research activities by operating instrumented aircraft platforms on a long-term basis
and attaining the highest levels of scientific outcome and impacts. We plan to provide
today’s scientists and the next generation of scientists with exciting opportunities to use
aircraft platforms to pursue new scientific ideas and to develop and use new technologies
and methodologies. It is also planned to extend these new research opportunities to foreign
scientists so that this Japanese system serves as a center of research and promotes Earth
observations throughout Asia. The basic scientific knowledge obtained by this program will
be made public in order to contribute to the welfare of world societies. All the processes
involved in this research plan, including organizing scientists and activities, selection and
scheduling of instruments, soliciting proposals, making field measurements, data archiving,
and using the data, will be transparent to all scientific communities.
3 Needs for Aircraft Observations
Japanese scientific communities are successfully conducting Earth observations using
satellite platforms (e.g., GCOM, GOSAT, GPM, and EarthCARE) and successfully
developing and using large complex numerical models of the atmosphere and ocean
supported by large-scale computing systems. However, Japanese aircraft observation
systems are far behind the international standard set by the USA and Europe due to the lack
of dedicated aircraft and the number of suitable payload instruments. Direct atmospheric
observations of gases and aerosols from aircraft using in-situ and remote sensing
instruments are essential to complement those made on larger scales from satellites. For
example, microphysical properties of aerosols, clouds, and precipitation, which can be
measured adequately only by direct aircraft observations, are critical parameters for studies
of the global environment and climate change. Processes critical for reliable predictions of
climate change strongly depend on these parameters. At the initial stage of this proposed
program, we will stress the need for accurate and systematic observations of microphysical
quantities, including the chemical and physical properties of aerosols, the size distributions
of cloud and precipitating particles, and the distribution of greenhouse gases on small to
large spatial scales, in order to yield insights into key processes and ultimately to achieve
scientific breakthroughs. Having more precise, accurate and abundant atmospheric
observations from aircraft will facilitate improvements in satellite remote sensing methods
and contribute to advances in model predictions of global change through improved
understanding of basic processes and more comprehensive comparisons with observations.
4. Important research areas for climate
A.! We consider three areas as priorities for climate science research with instrumented
aircraft platforms:
a)! Greenhouse gases, which drive global warming;
b)! Aerosol, clouds, and precipitation, which are some of the most uncertain factors for
estimating global radiative forcing and the climate response;
c)! Typhoons and torrential downpours, which may have strong impacts on societies as
climate changes proceed further;
These areas have been studied for a long time by Japanese scientists, making strong
links with satellite observations and modeling studies.
B.! Earth system science and disaster prevention Earth observations by instrumented aircraft will promote the wider study of climate
and Earth system science, including the biosphere (terrestrial and marine ecosystems)
and the physics and chemistry of the ocean and sea ice, for which the lack of sufficient
observations by aircraft is limiting scientific advances. Direct observations of
microscale properties, such as vegetation types and the extent and distribution of sea ice,
will enable insightful interpretations of macroscopic properties observed by satellites
and will contribute to improved understanding of basic processes needed for model
development.
Aircraft observation systems (e.g., synthetic aperture radar and gas and aerosol
detectors) will be used to make observations that will help minimize damage from
natural disasters such as earthquakes, volcanic eruptions, tsunamis, floods, fires, and
severe storms, and prevent serious accidents such as pollution of marine ecosystems and
accidents in nuclear power plants.
C. New aeronautical technology for weather observation
Considering that the future aircraft observation of weather, development of the
-
Unmanned Aerial Vehicles (UAV) technology is desired in terms of flight area,
frequency and cost. In collaboration with the Japan Society for Aeronautical and Space
Sciences, UAV observation technology for weather observation/monitoring is planned.
5 Organizations and operations
The Institute for Space-Earth Environmental Research of Nagoya University has established the “Center for Orbital and Suborbital Observations” in order to play a central role in aircraft observations. This center will organize and manage activities related to aircraft observations in close cooperation with scientists from several institutions in Japan, such as the University of Tokyo, Chiba University, the Meteorological Research Institute, the National Institute for Environmental Studies, the National Institute of Polar Research, and the National Institute of Information and Communications Technology.
Operations related to aircraft observations will be supported by companies and
foundations, such as Diamond Air Service Inc. and Japan Space Forum, which are fully
experienced with the operations and management and support necessary to conduct
successful aircraft observation studies. We can receive advice and support aeronautical
section of JAXA on determination of test plan and flight conditions in the flight test to
realize more efficient and safety flight experiment.
6. Planned Aircraft
We plan to use the Gulfstream IV type aircraft as rental from a private company such
as Diamond Air Service. This is the major change from the previous plan issued in
2015: Mitsubishi Regional Jet (MRJ) is the proposed aircraft in the previous plan. The
advantages to introduce Gulfstream IV are longer flight range about 6500 km that is
about 1.5 times longer range than MRJ, and rental cost is much cheaper than the
procurement and maintenance cost of MRJ.