The Earth Science Decadal Survey (in full: U.S. National Academy of Sciences Decadal Survey for Earth Science and Applications from Space) is a publication of the United States National Research Council that identifies key research priorities in the field of Earth Sciences with a focus on remote sensing. It is written and released at the request of three United States government agencies: the National Aeronautics and Space Administration (NASA), the National Oceanic and Atmospheric Administration (NOAA) and the U.S. Geological Survey (USGS). The survey is produced by the Committee on the Decadal Survey for Earth Science and Applications from Space (ESAS) of the National Academies of Sciences, Engineering and Medicine (NASEM) Space Studies Board, Division on Engineering and Physical Sciences. [1] Agencies like NASA use the recommendations from the decadal survey to prioritize funding for specific types of scientific research projects. [2]
As of 2021, two decadal surveys have been released. The first, for the decade 2007–2017, “Earth Science and Applications from Space: National Imperatives for the Next Decade and Beyond” was published in 2007. [3] The second, for the decade 2017 to 2027, “Thriving on Our Changing Planet: A Decadal Strategy for Earth Observations from Space” was published in 2018. [4] [5]
The National Academy of Sciences began creating technical panels and overseeing Earth observation satellites in the late 1950s after the launch of Explorer-I and the Vanguard satellites. [6]
In the intervening years prior to the official decadal surveys, the Space Studies Board of the National Research Council produced many reports outlining Earth observation goals. Examples include: the 1991 “Assessment of Satellite Earth Observation Programs”, [7] the 2004 “Utilization of Operational Environmental Satellite Data: Ensuring Readiness for 2010 and Beyond” and the 2005 “Earth Science and Applications from Space: Urgent Needs and Opportunities to Serve the Nation” and “Extending the Effective Lifetimes of Earth Observing Research Missions.” [3]
“Earth Science and Applications from Space: National Imperatives for the Next Decade and Beyond“ called for Earth observations falling into seven categories: applications and societal benefits, land-use change, weather, climate change, water resources, human health, and solid-Earth hazards. [3] A related NASA planning document was released in 2010 nicknamed the “Climate Initiative” (full name: Responding to the Challenge of Climate and Environmental Change: NASA's Plan for Climate-Centric Architecture for Earth Observations and Applications). [8]
Recommended missions from the 2007 survey included many satellites that became operational in some format. For example, the survey recommended a continuation of NPOESS (dissolved), which is now called JPSS, including instruments like VIIRS on the two satellites Suomi-NPP and NOAA-20 which launched in 2011 and 2017. Soil Moisture Active Passive (SMAP) was launched in 2015. The Ice Cloud and land Elevation Satellite (ICESat-2) was launched in 2018. The Gravity Recovery and Climate Experiment-II, later named Follow-On (GRACE-FO) launched in 2018 to continue the data collection from GRACE-1 and -2.
Other missions recommended by the 2007 survey are still in a planning stage as of 2021. For example, 3D-Winds is planned for 2023 to 2026. Aerosol Cloud Ecosystems (ACE) was the precursor to the Plankton, Aerosol, Cloud and ocean Ecosystems (PACE) mission which is planned to launch in 2023 or 2024. Surface Water and Ocean Topography (SWOT) is planned to launch in 2022. [4]
Other missions from the 2007 list have had other outcomes as of 2021. The Hyperspectral Infrared Imager (HyspIRI) – satellite mission [9] was cancelled as a satellite mission, but has been used as an airborne sensor. [10] The Climate Absolute Radiance and Refractivity Observatory (CLARREO) mission has no set launch date as of 2021. [11] Deformation, Ecosystem Structure, and Dynamics of Ice (DESDynI) had its funding cut in 2011. [12] The GeoCAPE mission, while not implemented, was the precursor for future missions TEMPO, GeoCARB, and GLIMR. [13] The LIDAR Surface Topography (LIST) mission was simulated but never built. [14] The Global Atmospheric Composition Mission (GACM), Precipitation and All-weather Temperature and Humidity (PATH), [15] Snow and Cold Land Processes (SCLP), and Extended Ocean Vector Winds Mission (XOVWM) were not implemented as laid out in the 2007 survey.
In “Thriving on Our Changing Planet: A Decadal Strategy for Earth Observation from Space,” the Earth observation topics that ranked as the most important in the 2017 survey were: aerosol properties, atmospheric winds, greenhouse gases, surface biology and geology, terrestrial ecosystem structure, ocean ecosystem structure, aquatic-coastal biogeochemistry, soil moisture, ocean surface winds and currents, vegetation-snow-surface energy balance, and surface topography and vegetation. [4]
The 2017 survey recommended that United States agencies NASA, NOAA and USGS work on a coordinated approach to earth observations in the next decade. [16]
For aerosol and cloud science, priorities listed include a polarimetric imager for aerosol observations in Earth's atmosphere toward better weather forecasts [17] and concurrent deployment of both a polarimeter and Lidar instrument from an airplane (airborne measurements). [18]
The survey recommended intentional, early development of applications for satellite data to answer societally-relevant research questions before new satellite missions are formalized and well before launch. [19]
The 2017 survey explained that out of the missions laid out in the 2007 survey, some were successfully launched (“implemented”), some were recommended but required further planning (“partially implemented” or a “designated program element”), and some were given an undetermined status (called “incubation,” “unallocated,” or “recommended as a candidate for Earth System Explorer” missions in the future).
Designated program elements, future missions that were prioritized, include: PACE, Surface Biology and Geology, a successor to GRACE-FO, and a successor to NISAR. [4]
Surface Biology and Geology was one of the designated program elements. The goal is to improve measurements of the characteristics of Earth's surface for natural resources management, food security, and water security, along with many other applications. [20] This mission is still in the early planning stages as of 2021 but will likely have 10s of meters spatial resolution, 16-day revisit time, and a combination of hyperspectral and multispectral coverage. [21] [20]
Lidar is a method for determining ranges by targeting an object or a surface with a laser and measuring the time for the reflected light to return to the receiver. Lidar may operate in a fixed direction or it may scan multiple directions, in which case it is known as lidar scanning or 3D laser scanning, a special combination of 3-D scanning and laser scanning. Lidar has terrestrial, airborne, and mobile applications.
Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object, in contrast to in situ or on-site observation. The term is applied especially to acquiring information about Earth and other planets. Remote sensing is used in numerous fields, including geophysics, geography, land surveying and most Earth science disciplines ; it also has military, intelligence, commercial, economic, planning, and humanitarian applications, among others.
The Landsat program is the longest-running enterprise for acquisition of satellite imagery of Earth. It is a joint NASA / USGS program. On 23 July 1972, the Earth Resources Technology Satellite was launched. This was eventually renamed to Landsat 1 in 1975. The most recent, Landsat 9, was launched on 27 September 2021.
The Earth Observing System (EOS) is a program of NASA comprising a series of artificial satellite missions and scientific instruments in Earth orbit designed for long-term global observations of the land surface, biosphere, atmosphere, and oceans. Since the early 1970s, NASA has been developing its Earth Observing System, launching a series of Landsat satellites in the decade. Some of the first included passive microwave imaging in 1972 through the Nimbus 5 satellite. Following the launch of various satellite missions, the conception of the program began in the late 1980s and expanded rapidly through the 1990s. Since the inception of the program, it has continued to develop, including; land, sea, radiation and atmosphere. Collected in a system known as EOSDIS, NASA uses this data in order to study the progression and changes in the biosphere of Earth. The main focus of this data collection surrounds climatic science. The program is the centrepiece of NASA's Earth Science Enterprise.
Satellite images are images of Earth collected by imaging satellites operated by governments and businesses around the world. Satellite imaging companies sell images by licensing them to governments and businesses such as Apple Maps and Google Maps.
Seasat was the first Earth-orbiting satellite designed for remote sensing of the Earth's oceans and had on board one of the first spaceborne synthetic-aperture radar (SAR). The mission was designed to demonstrate the feasibility of global satellite monitoring of oceanographic phenomena and to help determine the requirements for an operational ocean remote sensing satellite system. Specific objectives were to collect data on sea-surface winds, sea-surface temperatures, wave heights, internal waves, atmospheric water, sea ice features and ocean topography. Seasat was managed by NASA's Jet Propulsion Laboratory and was launched on 27 June 1978 into a nearly circular 800 km (500 mi) orbit with an inclination of 108°. Seasat operated until 10 October 1978 (UTC), when a massive short circuit in the Agena-D bus electrical system ended the mission.
Aeolus, or, in full, Atmospheric Dynamics Mission-Aeolus (ADM-Aeolus), was an Earth observation satellite operated by the European Space Agency (ESA). It was built by Airbus Defence and Space, launched on 22 August 2018, and re-entered the atmosphere over Antarctica in a controlled manner and burned up on 28 July 2023. ADM-Aeolus was the first satellite with equipment capable of performing global wind-component-profile observation and provided much-needed information to improve weather forecasting. Aeolus was the first satellite capable of observing what the winds are doing on Earth, from the surface of the planet and into the stratosphere 30 km high.
Ocean color is the branch of ocean optics that specifically studies the color of the water and information that can be gained from looking at variations in color. The color of the ocean, while mainly blue, actually varies from blue to green or even yellow, brown or red in some cases. This field of study developed alongside water remote sensing, so it is focused mainly on how color is measured by instruments.
Soil Moisture Active Passive (SMAP) is a NASA environmental monitoring satellite that measures soil moisture across the planet. It is designed to collect a global 'snapshot' of soil moisture every 2 to 3 days. With this frequency, changes from specific storms can be measured while also assessing impacts across seasons of the year. SMAP was launched on 31 January 2015. It was one of the first Earth observation satellites developed by NASA in response to the National Research Council's Decadal Survey.
EarthCARE is a planned joint European/Japanese satellite, the sixth of ESA's Earth Explorer Programme. The main goal of the mission is the observation and characterization of clouds and aerosols as well as measuring the reflected solar radiation and the infrared radiation emitted from Earth's surface and atmosphere.
ICESat-2, part of NASA's Earth Observing System, is a satellite mission for measuring ice sheet elevation and sea ice thickness, as well as land topography, vegetation characteristics, and clouds. ICESat-2, a follow-on to the ICESat mission, was launched on 15 September 2018 onboard Delta II as the final flight from Vandenberg Air Force Base in California, into a near-circular, near-polar orbit with an altitude of approximately 496 km (308 mi). It was designed to operate for three years and carry enough propellant for seven years. The satellite orbits Earth at a speed of 6.9 kilometers per second (4.3 mi/s).
The Cyclone Global Navigation Satellite System (CYGNSS) is a space-based system developed by the University of Michigan and Southwest Research Institute with the aim of improving hurricane forecasting by better understanding the interactions between the sea and the air near the core of a storm.
CLARREO is a high-priority NASA decadal survey mission, originally selected as such by the National Research Council in 2007. The CLARREO mission is intended to provide a metrology laboratory in orbit to accurately quantify and attribute Earth's climate change. The mission is also designed to transfer its high accuracy to other spaceborne sensors. It would serve as a reference calibration standard in orbit, making climate trends apparent in their data sets by 2055, within a 30-year time frame after its planned launch in the 2020s. These measurements may go on to enable testing, validation, and improvement of climate model prediction.
Sreedharan Krishnakumari Satheesh is an Indian meteorologist and a professor at the Centre for Atmospheric and Oceanic Sciences of the Indian Institute of Science (IISc). He holds the chair of the Divecha Centre for Climate Change, a centre under the umbrella of the IISc for researches on climate variability, climate change and their impact on the environment. He is known for his studies on atmospheric aerosols and is an elected fellow of all the three major Indian science academies viz. Indian Academy of Sciences Indian National Science Academy and the National Academy of Sciences, India as well as The World Academy of Sciences. The Council of Scientific and Industrial Research, the apex agency of the Government of India for scientific research, awarded him the Shanti Swarup Bhatnagar Prize for Science and Technology, one of the highest Indian science awards for his contributions to Earth, Atmosphere, Ocean and Planetary Sciences in 2009. He received the TWAS Prize of The World Academy of Sciences in 2011. In 2018, he received the Infosys Prize, one of the highest monetary awards in India that recognize excellence in science and research, for his work in the field of climate change.
Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) is a NASA Earth-observing satellite mission that will continue and advance observations of global ocean color, biogeochemistry, and ecology, as well as the carbon cycle, aerosols and clouds. PACE will be used to identify the extent and duration of phytoplankton blooms and improve understanding of air quality. These and other uses of PACE data will benefit the economy and society, especially sectors that rely on water quality, fisheries and food security.
Tropospheric Emissions: Monitoring of Pollution (TEMPO) is a space-based spectrometer designed to measure air pollution across greater North America at a high resolution and on an hourly basis. The ultraviolet–visible spectrometer will provide hourly data on ozone, nitrogen dioxide, and formaldehyde in the atmosphere.
Eni G. Njoku is a Nigerian-American scientist specializing in microwave remote sensing. He worked at the Jet Propulsion Laboratory (JPL), California Institute of Technology, where he was responsible for developing techniques for sea surface temperature and soil moisture remote sensing using microwave radiometers. He produced the first microwave-derived sea surface temperature maps from space, and developed the first application of deployable mesh antennas for satellite Earth observation. From 2008-2013, he served as project scientist of NASA's first soil moisture mission, the Soil Moisture Active Passive (SMAP) mission, launched in 2015.
The Hyperspectral Imager for the Coastal Ocean (HICO) was a hyperspectral earth observation sensor that operated on the International Space Station (ISS) from 2009 to 2014. HICO collected hyperspectral satellite imagery of the earth's surface from the ISS.
Underwater exploration is the exploration of any underwater environment, either by direct observation by the explorer, or by remote observation and measurement under the direction of the investigators. Systematic, targeted exploration is the most effective method to increase understanding of the ocean and other underwater regions, so they can be effectively managed, conserved, regulated, and their resources discovered, accessed, and used. Less than 10% of the ocean has been mapped in any detail, less has been visually observed, and the total diversity of life and distribution of populations is similarly obscure.
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