Chesapeake Light

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Chesapeake Light
Chesapeake Light.PNG
Undated photograph of Chesapeake Light (USCG)
Chesapeake Light
Location16 mi east of Cape Henry, Virginia
Coordinates 36°54′16.7″N75°42′45.82″W / 36.904639°N 75.7127278°W / 36.904639; -75.7127278 Coordinates: 36°54′16.7″N75°42′45.82″W / 36.904639°N 75.7127278°W / 36.904639; -75.7127278 [1]
Tower
FoundationFour black piles
Constructionprefabricated modules
Automated1980
Height120 feet (37 m)
ShapeWhite square platform with blue tower at one corner
Fog signal HORN: 1 blast ev 10s (1s bl)
Racon N (– •)
Light
First lit1965
Deactivated2016 [2]
Focal height117 feet (36 m)
Range19 miles (31 km)
Characteristic Fl (2)W 15s
  0.1s fl 2.9s ec.
  0.1s fl 11.9s ec.

Chesapeake Light is an offshore lighthouse marking the entrance to the Chesapeake Bay. [1] The structure was first marked with a lightship in the 1930s, and was later replaced by a "Texas Tower" in 1965. The lighthouse was eventually automated and was used for supporting atmospheric measurement sites for NASA and NOAA. Due to deteriorating structural conditions, the lighthouse was deactivated in 2016. At the time it was the last remaining "Texas Tower" still in use due to obsolescence.

Contents

History

Chesapeake Light was first established in 1930 using a lightship dubbed United States lightship Chesapeake (LV-116). It remained on station (except during World War II) until it was replaced by the present structure in 1965. The current light is also referred to as a "Texas Tower", one of six nearly identical lights on the East Coast which were built at the time. At some point the former lightship was moved to the Inner Harbor in Baltimore, Maryland where it is now on display. The light was automated in 1980, and seventeen years later became a site for NASA to perform meteorological research.

In 2001, NASA sponsored a field mission at the lighthouse called the Chesapeake Lighthouse and Aircraft Measurements for Satellites (CLAMS). The CLAMS field mission involved six aircraft flying over the lighthouse to improve understanding of atmospheric aerosols, to validate and improve the satellite data products, and to test new instruments and measurement concepts. [3]

Chesapeake Light was used in 2002-2003 by University of Maryland, Baltimore County students for research projects. The following year it was inspected by the Coast Guard for possible dismantling, but the inspection showed the light to be sound. By this time, Chesapeake Light was the last remaining "Texas tower" still in use as Frying Pan Shoals Light was deactivated in 2003. Chesapeake Light continued in service until early July, 2016 when it stopped transmitting data. The NDBC lost its access to the tower to service and maintain the equipment after the coast guard had determined the lighthouse was "structurally unsound". [4] The lighthouse was then auctioned off on August 3, 2016 where it sold for $215,000 (USD) to an anonymous buyer. [5]

Meteorological measurement site

For over a decade, the Chesapeake Light has hosted a suite of meteorological and climate-observing instruments that take measurements for NASA's Clouds and the Earth's Radiant Energy System (CERES) project. The instrument suite, known as CERES Ocean Validation Experiment (COVE), records the direct beam energy from the sun, the sun's energy scattered by the sky, the amount of sunlight scattered by the ocean surface, wind speed, aerosol composition, air temperature, sea surface temperature and more. The measurements validate observations made by the CERES satellite system, which is managed by NASA's Langley Research Center in Hampton, Virginia.

COVE instrumentation, which was used to measure incident solar energy, atop the Chesapeake Light. (Credit: NASA) COVE Instrumentation.jpg
COVE instrumentation, which was used to measure incident solar energy, atop the Chesapeake Light. (Credit: NASA)

The collection of CERES instruments, which are mounted on several space-based satellites, has been operating for more than a decade, creating a long-term record of the key driver of Earth's climate – the balance of incoming and outgoing solar radiation known as the "energy budget."

The COVE instruments at the Chesapeake Light Station are uniquely located over an all ocean environment, and serve to validate the observations the CERES satellites make over the oceans. Validations over the ocean are important because three quarters of the Earth's surface is water.

The COVE instrumentation is also part of an international network of satellite ground truth sites known as the Baseline Surface Radiation Network (BSRN).

Other meteorological and atmospheric instrumentation located at Chesapeake Light Station include the AErosol RObotic NETwork (AERONET), which is a ground-based, worldwide network that measures atmospheric aerosols. Chesapeake Light also hosts the Micro Pulse Lidar Network, which measures aerosol and cloud vertical structure, and NOAA's Ground-Based Global Positioning System Meteorology Network (GPS-MET) which measures atmospheric column water vapor.

Related Research Articles

<span class="mw-page-title-main">Clouds and the Earth's Radiant Energy System</span> NASA satellite climate data instruments

Clouds and the Earth's Radiant Energy System (CERES) is on-going NASA climatological experiment from Earth orbit. The CERES are scientific satellite instruments, part of the NASA's Earth Observing System (EOS), designed to measure both solar-reflected and Earth-emitted radiation from the top of the atmosphere (TOA) to the Earth's surface. Cloud properties are determined using simultaneous measurements by other EOS instruments such as the Moderate Resolution Imaging Spectroradiometer (MODIS). Results from the CERES and other NASA missions, such as the Earth Radiation Budget Experiment (ERBE), could enable nearer to real-time tracking of Earth's energy imbalance and better understanding of the role of clouds in global climate change.

<span class="mw-page-title-main">Earth's energy budget</span> Accounting of the energy flows which determine Earths surface temperature and drive its climate

Earth's energy budget accounts for the balance between the energy that Earth receives from the Sun and the energy the Earth loses back into outer space. Smaller energy sources, such as Earth's internal heat, are taken into consideration, but make a tiny contribution compared to solar energy. The energy budget also accounts for how energy moves through the climate system. Because the Sun heats the equatorial tropics more than the polar regions, received solar irradiance is unevenly distributed. As the energy seeks equilibrium across the planet, it drives interactions in Earth's climate system, i.e., Earth's water, ice, atmosphere, rocky crust, and all living things. The result is Earth's climate.

<span class="mw-page-title-main">Index of meteorology articles</span>

This is a list of meteorology topics. The terms relate to meteorology, the interdisciplinary scientific study of the atmosphere that focuses on weather processes and forecasting.

<span class="mw-page-title-main">Tropical Rainfall Measuring Mission</span> Joint space mission between NASA and JAXA

The Tropical Rainfall Measuring Mission (TRMM) was a joint space mission between NASA and JAXA designed to monitor and study tropical rainfall. The term refers to both the mission itself and the satellite that the mission used to collect data. TRMM was part of NASA's Mission to Planet Earth, a long-term, coordinated research effort to study the Earth as a global system. The satellite was launched on 27 November 1997 from the Tanegashima Space Center in Tanegashima, Japan. TRMM operated for 17 years, including several mission extensions, before being decommissioned on 15 April 2015. TRMM re-entered Earth's atmosphere on 16 June 2015.

<span class="mw-page-title-main">NOAA-19</span>

NOAA-19, known as NOAA-N' before launch, is the last of the American National Oceanic and Atmospheric Administration (NOAA) series of weather satellites. NOAA-19 was launched on 6 February 2009. NOAA-19 is in an afternoon equator-crossing orbit and is intended to replace NOAA-18 as the prime afternoon spacecraft.

<span class="mw-page-title-main">Texas Tower (lighthouse)</span>

A Texas Tower lighthouse is a structure which is similar to an off-shore oil platform. Seven of these structures were built in the 1960s off the shores of the United States. Automation started in the late 1970s, which led to the obsolescence of the housing built for the keepers which resulted in such a large structure. Three of the towers were dismantled over time due to deteriorating structural conditions among other problems, while another one was destroyed in a ship collision. The last Texas Tower was deactivated in 2016 having served for over half a century. Today only three of the former lights remain.

<span class="mw-page-title-main">Outgoing longwave radiation</span> Energy transfer mechanism which enables planetary cooling

Outgoing Long-wave Radiation (OLR) is electromagnetic radiation of wavelengths from 3–100 μm emitted from Earth and its atmosphere out to space in the form of thermal radiation. It is also referred to as up-welling long-wave radiation and terrestrial long-wave flux, among others. The flux of energy transported by outgoing long-wave radiation is measured in W/m2. In the Earth's climate system, long-wave radiation involves processes of absorption, scattering, and emissions from atmospheric gases, aerosols, clouds and the surface.

<span class="mw-page-title-main">Atmospheric chemistry observational databases</span>

Over the last two centuries many environmental chemical observations have been made from a variety of ground-based, airborne, and orbital platforms and deposited in databases. Many of these databases are publicly available. All of the instruments mentioned in this article give online public access to their data. These observations are critical in developing our understanding of the Earth's atmosphere and issues such as climate change, ozone depletion and air quality. Some of the external links provide repositories of many of these datasets in one place. For example, the Cambridge Atmospheric Chemical Database, is a large database in a uniform ASCII format. Each observation is augmented with the meteorological conditions such as the temperature, potential temperature, geopotential height, and equivalent PV latitude.

<span class="mw-page-title-main">Ocean color</span> Explanation of the color of oceans and ocean color remote sensing

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.

<span class="mw-page-title-main">NOAA-18</span>

NOAA-18, also known as NOAA-N before launch, is an operational, polar orbiting, weather satellite series operated by the National Environmental Satellite Service (NESS) of the National Oceanic and Atmospheric Administration (NOAA). NOAA-18 also continued the series of Advanced TIROS-N (ATN) spacecraft begun with the launch of NOAA-8 (NOAA-E) in 1983 but with additional new and improved instrumentation over the NOAA A-M series and a new launch vehicle. NOAA-18 is in an afternoon equator-crossing orbit and replaced NOAA-17 as the prime afternoon spacecraft.

<span class="mw-page-title-main">NOAA-15</span>

NOAA-15, also known as NOAA-K before launch, is an operational, polar-orbiting of the NASA-provided Television Infrared Observation Satellite (TIROS) series of weather forecasting satellite operated by National Oceanic and Atmospheric Administration (NOAA). NOAA-15 was the latest in the Advanced TIROS-N (ATN) series. It provided support to environmental monitoring by complementing the NOAA/NESS Geostationary Operational Environmental Satellite program (GOES).

<span class="mw-page-title-main">Atmospheric infrared sounder</span> Science instrument on NASAs Aqua satellite

The atmospheric infrared sounder (AIRS) is one of six instruments flying on board NASA's Aqua satellite, launched on May 4, 2002. The instrument is designed to support climate research and improve weather forecasting.

<span class="mw-page-title-main">OSTM/Jason-2</span> International Earth observation satellite mission

OSTM/Jason-2, or Ocean Surface Topography Mission/Jason-2 satellite, was an international Earth observation satellite altimeter joint mission for sea surface height measurements between NASA and CNES. It was the third satellite in a series started in 1992 by the NASA/CNES TOPEX/Poseidon mission and continued by the NASA/CNES Jason-1 mission launched in 2001.

<span class="mw-page-title-main">Joint Polar Satellite System</span> Constellation of American meteorology satellites

The Joint Polar Satellite System (JPSS) is the latest generation of U.S. polar-orbiting, non-geosynchronous, environmental satellites. JPSS will provide the global environmental data used in numerical weather prediction models for forecasts, and scientific data used for climate monitoring. JPSS will aid in fulfilling the mission of the U.S. National Oceanic and Atmospheric Administration (NOAA), an agency of the Department of Commerce. Data and imagery obtained from the JPSS will increase timeliness and accuracy of public warnings and forecasts of climate and weather events, thus reducing the potential loss of human life and property and advancing the national economy. The JPSS is developed by the National Aeronautics and Space Administration (NASA) for the National Oceanic and Atmospheric Administration (NOAA), who is responsible for operation of JPSS. Three to five satellites are planned for the JPSS constellation of satellites. JPSS satellites will be flown, and the scientific data from JPSS will be processed, by the JPSS – Common Ground System (JPSS-CGS).

<span class="mw-page-title-main">Suomi NPP</span>

The Suomi National Polar-orbiting Partnership, previously known as the National Polar-orbiting Operational Environmental Satellite System Preparatory Project (NPP) and NPP-Bridge, is a weather satellite operated by the United States National Oceanic and Atmospheric Administration (NOAA). It was launched in 2011 and continues to operate in June 2022.

<span class="mw-page-title-main">GOES-16</span> American geosynchronous environmental satellite

GOES-16, formerly known as GOES-R before reaching geostationary orbit, is the first of the GOES-R series of Geostationary Operational Environmental Satellites (GOES) operated by NASA and the National Oceanic and Atmospheric Administration (NOAA). GOES-16 serves as the operational geostationary weather satellite in the GOES East position at 75.2°W, providing a view centered on the Americas. GOES-16 provides high spatial and temporal resolution imagery of the Earth through 16 spectral bands at visible and infrared wavelengths using its Advanced Baseline Imager (ABI). GOES-16's Geostationary Lightning Mapper (GLM) is the first operational lightning mapper flown in geostationary orbit. The spacecraft also includes four other scientific instruments for monitoring space weather and the Sun.

Ground-based, flight-based, or satellite-based remote sensing instruments can be used to measure properties of the planetary boundary layer, including boundary layer height, aerosols and clouds. Satellite remote sensing of the atmosphere has the advantage of being able to provide global coverage of atmospheric planetary boundary layer properties while simultaneously providing relatively high temporal sampling rates. Advancements in satellite remote sensing have provided greater vertical resolution which enables higher accuracy for planetary boundary layer measurements.

<span class="mw-page-title-main">Plankton, Aerosol, Cloud, ocean Ecosystem</span>

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.

<span class="mw-page-title-main">NOAA-20</span>

NOAA-20, designated JPSS-1 prior to launch, is the first of the United States National Oceanic and Atmospheric Administration's latest generation of U.S. polar-orbiting, non-geosynchronous, environmental satellites called the Joint Polar Satellite System. NOAA-20 was launched on 18 November 2017 and joined the Suomi National Polar-orbiting Partnership satellite in the same orbit. NOAA-20 operates about 50 minutes ahead of Suomi NPP, allowing important overlap in observational coverage. Circling the Earth from pole-to-pole, it crosses the equator about 14 times daily, providing full global coverage twice a day. This will give meteorologists information on "atmospheric temperature and moisture, clouds, sea-surface temperature, ocean color, sea ice cover, volcanic ash, and fire detection" so as to enhance weather forecasting including hurricane tracking, post-hurricane recovery by detailing storm damage and mapping of power outages.

<span class="mw-page-title-main">NOAA-9</span>

NOAA-9, known as NOAA-F before launch, was an American weather satellite operated by the National Oceanic and Atmospheric Administration (NOAA) for use in the National Environmental Satellite Data and Information Service (NESDIS). It was the second of the Advanced TIROS-N series of satellites. The satellite design provided an economical and stable Sun-synchronous platform for advanced operational instruments to measure the atmosphere of Earth, its surface and cloud cover, and the near-space environment.

References

  1. 1 2 Light List, Volume II, Atlantic Coast, Shrewsbury River, New Jersey to Little River, South Carolina (PDF). Light List. United States Coast Guard. 2012. p. 3.
  2. "Station CHLV2 - Chesapeake Light, VA". NOAA . Retrieved October 17, 2017.
  3. "Chesapeake Lighthouse and Aircraft Measurements for Satellites (CLAMS)". NASA . Archived from the original on July 20, 2012. Retrieved December 21, 2017.
  4. "Service Change Notice 16-30". NOAA . August 26, 2016. Archived from the original on May 1, 2017. Retrieved December 21, 2017.
  5. "Chesapeake Light Tower". gsaauctions.gov. Retrieved December 21, 2017.

Further reading